JPH05165127A - Photograhic screen size switching camera - Google Patents

Abstract

PURPOSE:To photograph by a usual standard photographic screen size in the case that a perforation exists on a film loaded in a camera main body, to change the photographic screen size so that the photographic screen size larger than the standard photographic screen size may be obtained in the case that the perforation does not exist, and also to correct and display the number of photographic frames in accordance with the larger photographic screen size. CONSTITUTION:A film cartridge 5 provided with data on the kind of the film and data on the number of photographic frames is used for this camera, and the camera is provided with a data reading means for reading each data at the time of loading the film cartridge 5, a photographic screen size switching means 40 for changing the size of the photographic screen in accordance with information on each piece of data, a controlling means for correcting the number of photographic frames in accordance with the same information on each data and a photographic frame number display means for displaying the number of photographic frames.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera, and more particularly, to a photographing screen size switching camera for changing the photographing screen size by reading the information of the film contained in the film cartridge when the film cartridge is loaded.

[0002]

2. Description of the Related Art Conventionally, in a roll film using a film cartridge, as a means for identifying information of the film, as shown in JP-A-57-202524, the sensitivity of the film is set outside the film cartridge. There is a device provided with a code indicating the code, and an apparatus has been proposed which automatically sets a film speed suitable for the film by detecting the code.

FIG. 26 shows a current JIS135 for accommodating a normal film 52a having a perforation.
An example of the DX code 53a of the mold film cartridge 53 is shown, in which the leader portion of the normal film 52a is pulled out. This DX code 53a
The electrode ranges L1 to L12 of the electrode groups arranged in a row are divided into an electrically conducting portion and an insulating portion, and the electrically conducting portion is formed by exposing the metal surface of the peripheral surface of the film cartridge 53. The insulating portion is formed by applying an insulating coating to the same metal surface. In addition, in FIG. 26, a black-painted portion indicates an insulating portion that is insulation-coated. The detailed size of the normal film 52a is shown in FIGS. 25 (a) and 25 (b) and Table 1 below.

[0004]

[Table 1]

The DX code 53a has electrode ranges L1 and L.
7 and 7 are both set to the ground electrode portion, and conduction / non-conduction with this electrode range L1 or L7 is set in each electrode range (L2
.About.L6, L8 to L12), it is possible to obtain information on the film, which the electrode ranges respectively have.

FIG. 27 is a table showing codes for identifying film sensitivity, which are included in the electrode ranges L2 to L6. FIG. 28 is a table showing codes for identifying the number of films included in the electrode ranges L8 to L10. FIG. 29 is a table showing codes for identifying the allowable latitude of the film, which are included in the electrode ranges L11 and L12.

27 to 29, the mark (∘) in the table indicates that each electrode range is in conduction with the electrode range L1 or L7, and (-) indicates non-conduction. There is. In the example of the film cartridge 53 shown in FIG. 26, it can be seen from the information contained in the electrode ranges L2 to L6 and L8 to L12 that the film represents ISO 100, 24 shots, and + 2 / -1 latitude film.

Japanese Patent Publication No. 21570/1990 discloses that
There is shown an apparatus for determining whether or not the film cartridge 53 has the DX code 53a by simultaneously contacting two contacts with the ground electrode portion of the DX code 53a.

Further, in Japanese Patent Laid-Open No. 56-36629, the shape of the spool shaft of the film cartridge (the depth of the fitting hole provided in the spool shaft) when the film cartridge is loaded in the camera is described. By detecting the difference, the information of the film stored in the film cartridge, for example, the ASA sensitivity of the film is identified,
An apparatus capable of automatically adjusting the exposure adjustment of the camera is shown.

Further, in Japanese Patent Publication No. 44-2540, the unevenness for setting the film sensitivity is provided on the outside of the film cartridge, and by detecting this, the same as the proposal of the above-mentioned Japanese Patent Laid-Open No. 56-36629. There is shown a device for identifying the sensitivity of the film in the film cartridge and automatically adjusting the exposure of the camera.

On the other hand, as a camera capable of switching the size of a photographing screen using a roll film, Japanese Patent Publication No.
The one shown in Japanese Patent No. 14234 is known.
This camera is designed to switch the mask plate of the shooting screen and the size of the finder window at the same time, and the size of the shooting screen can be changed from outside the camera as needed depending on the purpose of shooting in the same camera. Change and shoot,
The intervals between the photographing screens are kept constant, and the size of the photographing screens is displayed on the finder window.

Further, Japanese Patent Application Laid-Open No. 58-142324 discloses a large-sized camera using a Brownie plate film, and it is also possible to use a 135 type film in addition to the Brownie plate film. It is shown. This is a film winding drive unit that is operated by a winding lever provided on the camera body so that the film winding unit for the Brownie plate and the film winding unit for the 135 type film cartridge can be switched. In addition, the film winding mechanism interlocking with the film winding drive unit is built in each of the film winding unit of the Brownie plate and the 135 type film cartridge winding unit.

Further, Japanese Laid-Open Patent Publication No. 59-188623 discloses a film counter device for a camera which reads information about the number of films recorded on the outer periphery of a film cartridge and displays the remaining number of films and the number of shots from this information. It is shown. This is to electrically read the film number information of the film cartridge loaded in the camera, convert the read film information into the number of films and store it, and subtract a certain number each time the shutter is operated. The calculation is performed and the calculation result is displayed.

[0014]

By the way, in the above-mentioned conventional cameras capable of switching the photographing screen size, the photographing screen size is manually switched, and the switching mechanism is also complicated. .. 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 from a standard size of 24 mm × 36 mm to a half size of 24 mm × 18 mm. As described above, only the length of the film in the feeding direction can be changed, and the length of the film in the direction orthogonal to the feeding direction cannot be changed together with the feeding direction of the film. Therefore, although it is easy to perform shooting with the shooting screen reduced to about the half size, it is difficult to obtain a shooting 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 Laid-Open No. 58-142324 is limited to a large-sized camera using a large plate film such as a Brownie plate.
It cannot be applied to a camera that can load only a 5 type film cartridge. Moreover, the size of the photographing screen can be changed only by loading films having completely different sizes. For example, it is impossible to change the photographing screen using only the 135-inch film cartridge.

By the way, the film loaded in the 135 type film cartridge has JIS 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 presence of this perforation, the effective shooting width can be only 25.4 mm with respect to the film width of 35 mm. Therefore, the standard shooting screen size is 24 mm × 36 m as defined by JIS standard B7115 and the like.
m, which is 2 in the direction orthogonal to the film feeding direction.
4/35 = 0.69, the effective utilization rate is 70% or less. Therefore, with the above standard shooting screen size, the enlargement ratio at the time of printing is increased and the deterioration of the print image quality is avoided, compared with the case where the width of the shooting screen is expanded to the film width of 35 mm to increase the effective utilization rate. I can't.

The above perforations are originally
It is provided for intermittent filming of motion picture film and is not always necessary for a normal still camera. Therefore, if the perforation is abolished and the photographing screen is enlarged, the enlargement ratio at the time of printing can be reduced and a high-quality printed image can be obtained.

However, if the perforation is abolished in this way, the film with perforation and the film without perforation must be displayed in some form. Therefore, it is conceivable to use the above-mentioned current DX code 53a (see FIG. 26).

However, in the current DX code 53a, applications are assigned to all electrode ranges, and other identification information cannot be included. Moreover, the DX code 5
3a is the standard size 24 mm × 3 as the screen size.
The number of films that can be photographed is displayed on the assumption of 6 mm (see FIG. 28).
Since the film counter device and the like disclosed in Japanese Patent No. 623 also count the number of frames to be photographed on the basis of the standard size, the photographing screen is made large, and in particular, it is enlarged in the lateral direction of the screen as compared with the standard size. In the case of shooting by using the film counter device or the like, if the remaining number of shooting frames is displayed, the number of shooting frames cannot be displayed correctly.

However, here the electrode ranges L1 and L7
Focusing on the fact that both and are set to the ground electrode, since the function as the ground electrode is sufficient even at one place, if at least one of the electrode ranges L1 and L7 functions as the ground electrode. I know it's good.

The present invention has been made in view of the above problems. First, a roll-out film incorporated in a film patrone is proposed as a film without perforation, and a conventional film having perforation and the above-mentioned perforation are proposed. While displaying the identification information with the abolished film, as a camera that uses these film patrones, when there is perforation in the film loaded in the camera body, it shoots with the conventional standard shooting screen size, When there is no perforation, the shooting screen size can be changed to a shooting screen size larger than the above standard shooting screen size, and the shooting screen size that can be corrected and displayed to the number of shooting frames corresponding to this large shooting screen size. Switching camera An object of the present invention is to provide.

[0022]

In order to achieve the above object, a photographing screen size switching camera according to the present invention is a camera using a film cartridge having film type data and photographing frame number data. There are data reading means for reading each of the above data when loading the film cartridge, shooting screen size switching means for changing the size of the shooting screen according to the information of each data, and according to the information of each data. It is characterized in that it is provided with control means for correcting the number of image pickup frames and image pickup frame number display means for displaying the number of image pickup frames.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Prior to describing an embodiment of a photographing screen size switching camera of the present invention, an embodiment of a film cartridge used in the camera will be described with reference to the drawings.

FIG. 4 shows an example of the film cartridge 5.

This film cartridge 5 plays a role in the DX code 53a as compared with the current 135 type film cartridge 53 (see FIG. 26) having the DX code 53a for accommodating the normal film 52a. Except for the different DX code 5a,
The size of the 135 type film cartridge 53 including the arrangement of the DX code 5a is exactly the same.
The film patrone 5 has a perforation-free 35 mm wide film 5 for wide-screen photography.
2b is stored. FIG. 4 is a view showing a state in which the leader portion of the film 52b is pulled out from the film cartridge 5.

The DX code 5a is the DX code 5
Similarly to 3a, the electrode ranges L1 to L12 of the arrayed electrode group are divided into an electrically conducting portion and an insulating portion, and the electrically conducting portion is formed by exposing the metal surface of the peripheral surface of the film cartridge 5. The insulating portion is formed by coating the metal background portion. It should be noted that in FIG. 4, a black-painted portion indicates an insulating portion coated with an insulating material.

In the DX code 5a, the electrode range L7 is an insulating portion as shown in the figure. This is the current D above
In the case of the film cartridge 53 having the X code 53a, in the DX code 53a, the electrode ranges L1 and L7 are both set to the ground electrode part, that is, the electric conduction part (see FIG. 26). This is because only the range L1 is used as the ground electrode portion and the electrode range L7 is used as the identification code. As a result, it becomes possible to display information other than the information on the film sensitivity, the number of frames that can be photographed, and the latitude on the film cartridge.

In the present embodiment, the identification target of the electrode range L7 is to determine the presence or absence of perforation of the film stored in the film cartridge 5 (hereinafter, this perforation-free film 5).
2b is referred to as an A type film).

Further, the electrode range L2 of the above DX code 5a
~ L6, L8 to L12 have the same roles as the DX code 53a. Therefore, the film cartridge 5 shown in FIG. 4 has ISO 100, 24 shots, + 2 /-
It is displayed as containing one-latitude, type A film, ie, a film without perforation.

FIG. 5 shows the film form (normal type or A type) and the electrode when the electrode range L7 is used as an identification code for the presence or absence of perforation of the film stored in the loaded film cartridge. It is a table showing the relationship with the state of the range.

Next, an embodiment of the photographing screen size switching camera of the present invention using the film cartridge 5 having the DX code 5a will be described with reference to the drawings.

FIG. 1 is a rear view of a photographing screen size switching camera showing an embodiment of the present invention, and is shown with a rear lid removed.

This camera has a normal photographing function in addition to the function described below.
As shown in the front view of FIG. 2, the release button 2 and the camera body 1 arranged near the one side of the upper surface of the camera body 1.
Lens 4 arranged in the center of the front surface of the
The finder window 3 arranged above the camera has the same function as a normal camera. The taking lens 4 has a larger image circle than a normal camera for the reason described later.

As shown in FIG. 1, the film cartridge loading chamber 11 which is a film supply chamber is provided with the film cartridge 5 described above.
(The dimensions are the same as those of the 135 type film cartridge defined in JIS K7519, etc.
The two-dot chain line portion indicated by the dimensions α, β, γ, δ represents its outer shape) and is attachable as illustrated. The dimensions α, β, γ and δ have the values shown in Table 2 below.

[0035]

[Table 2]

The DX code 5a is provided near the central portion of the wall surface on the front side of the camera body 1 in the cartridge loading chamber 11.
Reading contacts DX1 to DX12 are provided.
These contacts DX1 to DX12 are conductive contacts,
The film cartridge 5 having the DX code 5a
Is loaded on the camera body 1 as shown in FIG. 10,
The DX code 5a is arranged at a position where it comes into contact with each of the electrode ranges L1 to L12.

Further, in order to determine whether or not the film cartridge loaded in the cartridge loading chamber 11 has the DX code 5a, only the contact DX1 and the DX1a which are disposed in close proximity to each other are provided. It is composed of two contacts with the DX 1b. With this DX1a and DX1b, it is possible to determine whether the corresponding portion of the electrode range L1 of the DX code 5a is an electrically conducting portion or an insulating portion. That is, the above D
When X1a and DX1b are electrically connected, the loaded film cartridge is a film cartridge having a DX code 5a, and when DX1a and DX1b are not electrically connected, the film cartridge is a type not having a DX code. It can be judged that this is a film patrone.

On the other hand, a fork 12 for electrically rewinding the film cartridge 5 is arranged on the ceiling wall of the cartridge loading chamber 11 and is driven by a motor (not shown). .. Viewfinder eyepiece 1
3 is disposed in the upper center of the rear surface of the camera body 1,
It is an eyepiece of a finder optical system 30 (see FIG. 6) described later.

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

In this embodiment, as described above,
The size of the shooting screen was set to an aspect ratio of 1: √2, which is similar to the size of the A printing paper, but this setting value is not limited to the above ratio and is commonly used in the United States, for example. It is also possible to adopt a paper size such as letter size, legal size, or an aspect ratio that is similar to the paper size used in other countries.

The mask portion 14 in the camera body 1
A photographing screen mask switching mechanism 40 (see FIG. 8), which will be described later, is provided inward of this, and the photographing screen can be switched by this.

Further, at the upper and lower positions of the mask portion 14,
The film rails 15, 16, 17, 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. There is.

FIG. 3 shows these film rails 15 and 1.
FIG. 6 is a vertical sectional view of 6, 17, and 18 showing a state in which a film 52b (52a) loaded in the film cartridge 5 is pulled out and expanded, and then a rear lid (not shown) is closed. As is well known, the inside of the upper and lower edges of the film pressure plate 51 disposed inside the rear lid is in pressure contact with the front surfaces of the film rails 15 and 18, respectively. The central portion of the film is pushed inward to provide flatness. In addition, the film pressure plate 51 and the inner film rail 16,
A film guide portion for smoothly feeding the film 52b (52a) is formed between the front surface of the film 17.
Also, the inner length g between the film rails 15 and 18
(See FIG. 1) has a dimension value slightly larger than the film width of 35 mm as in a normal camera in order to facilitate sliding of the film.

Returning to FIG. 1, a film winding chamber 29 is arranged on the opposite side of the cartridge loading chamber 11 with the mask portion 14 interposed therebetween. Film winding spool shaft 1 of the same type as the other cameras
9 are provided. A rubber-like belt 20 having a large frictional force is wound around the center of the spool shaft 19 so as to ensure the film loading even if the film has no perforation.

When the film cartridge 5 is loaded into the cartridge loading chamber 11 of the spool shaft 19 and the rear lid (not shown) is closed after the leader portion is placed, the rear lid switch 103 (see FIG. 15) is turned on, and at the same time, the built-in hoisting / rewinding motor 108 (see FIG. 15) causes the CPU 101 (FIG. 1) described later.
5), the film winding / rewinding drive circuit 107 (see FIG. 15), which operates according to the instructions, automatically rotates in a predetermined direction to wind up the leader portion of the film. It is designed to wind a frame of film that has already been taken.

The rubber belt 20 of the spool shaft 19 has auxiliary bases supported by auxiliary roller arms 71a and 71b (see FIG. 11) whose base ends are swingably attached to the camera body 1. 21 is arranged so that the roller surface thereof abuts the surface of the rubber belt 20. The auxiliary roller 21 serves to assist the winding of the film on the spool shaft 19 when the film 52b (52a) is loaded by the rotation of the spool shaft 19.

A film feed amount detection roller shaft 22 is arranged in parallel with the spool shaft 19 at a position near the mask portion 14 near the side of the auxiliary roller 21, and the film feed amount detection roller shaft is provided. Detection rollers 22a and 22b made of rubber having a large frictional force are wound around the upper and lower portions of 22, respectively. When the film 52b (52a) is loaded, each of the detection rollers 22a and 22b comes into contact with the inner upper and lower ends of the film and rotates in synchronization with the loading of the film.

Therefore, the film feed amount detection roller shaft 22 rotates according to the feed amount of the film 52b (52a). A pulse generating mechanism 60 (see FIG. 9) for detecting a film feed amount, which will be described later, is provided on the upper shaft portion 22c of the detection roller shaft 22 extending into the camera body 1.
The rotary plate 61 is fixed to generate a pulse signal according to the rotation amount of the film feed amount detection roller shaft 22. With this, the CPU 101 can measure the film feed amount. It is like this.

FIG. 6 is a perspective view showing the structure of the finder optical system 30 in which the size of the field frame can be changed.

This optical system is composed of a real image type finder optical system consisting of an objective lens group 33, a Porro prism 31, and an eyepiece lens group 34. A large-screen finder optical system is provided on the incident surface of the Porro prism 31. The transmission type liquid crystal plate 32 capable of displaying the visual field frame 32a and the visual field frame 32b for the normal screen is provided so that the visual field frames can be electrically switched. On the transmissive liquid crystal plate 32, the display of the field frame 32a for a large screen and the field frame 32b for a normal screen are formed as shown in FIGS. 7 (a) and 7 (b), respectively.

The display switching of the transmissive liquid crystal plate 32 is controlled by a finder frame switching liquid crystal drive circuit 106 (see FIG. 15) which operates according to an instruction from the CPU 101.

FIG. 8 shows the photographing screen mask switching mechanism 4 described above.
It is a figure showing the composition of 0. 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 (see FIG. 15).

The screen size switching motor 41 is a CP
The rotation is controlled by a screen size switching motor drive circuit 104 (see FIG. 15) which operates according to the instruction of U101. This switching motor 41
The output gear 42 is rotatably engaged with a pinion 43, and the pinion 43 is rotatably engaged with a pinion 44. The mask frames 47 and 48 that are switched and driven by the pinions 43 and 44 are L
The character-shaped frame plates are formed so as to face each other, 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 to each other, and racks 47a and 48a are formed at the edge portions extending upward, respectively. And both racks 47a and 48a
Mesh with the pinions 43 and 44, respectively. In addition, guide elongated holes 47b, 4 are provided in the extending portion in a diagonal direction.
8b and 47c, 48c are bored, and the respective guide elongated holes are fitted in the guide pins 45, 46.

In the photographic screen mask switching mechanism 40 thus constructed, when the screen size switching motor 41 rotates in the direction of arrow λ1, the pinions 43 and 44 rotate in the directions of arrows λ2 and λ3, respectively, and the mask frame. Racks 47a and 48a of 47 and 48 have arrows λ4 and
Move in the direction of λ5. Thereby, the mask frame 47
And 48 move inward to each other and the inside of the frame becomes smaller,
It becomes a mask frame of the normal screen size. Further, when the screen size switching motor 41 rotates in the direction opposite to the arrow λ1, the mask frames 47 and 48 move in the opposite direction to the above, that is, in the direction in which the frame becomes larger, and the mask having the large photographing screen size is set. Form.

FIG. 9 is a perspective view showing the construction of the pulse generation mechanism 60 for detecting the film feed amount.

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

On the upper surface of the rotary plate 61, a contact spring support portion 62 made of an elastic conductor, for example, phosphor bronze or the like, is fixed at a predetermined position inside the camera body 1. A contact spring 63a whose base is fixed to the
63b is arranged in a direction parallel to the tangent line of the rotary plate 61. The tip 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 face each other so as to come into contact with the upper surface of the rotary plate 61. The base ends of the contact springs 63a and 63b are connected to the input terminals P5 and P6 (see FIG. 15) of the CPU 101, respectively.
A pulse signal generated by a short circuit with 3b is transmitted.

Now, when the loaded film is loaded, the film feed amount detection roller shaft 22 rotates according to the film feed amount, and the film feed amount detection roller shaft 22 is interlocked with the film feed amount detection roller shaft 22. The rotating plate 61 has an arrow λ6 in the figure.
Rotate in the direction of. At this time, the contact springs 63a and 63b
The contacts are alternately short-circuited by the copper foil 61a to generate a pulse signal. By detecting this pulse signal in the CPU 101, the film feed amount can be known.

Next, the manner of film loading when the film cartridge 5 accommodating the film 52b without perforation is loaded into the camera body 1 as shown in FIG. 10 will be described with reference to FIGS.

11 to 14 are cross-sectional views of the film winding chamber 29 shown in FIG. 1, showing the progress of loading of the film in order.

In FIG. 11, the rear cover 26 of the camera is
Auxiliary roller arms 75a, 75b and 76a, 76b
However, each base end is swingably attached to the auxiliary roller 2
4, 25 are supported in parallel with the spool shaft 19. That is, the base end side of the rear cover 26 is rotatably pivoted on the support shaft 74 disposed on the protruding portion 26a protruding on the inner side facing the film winding chamber 29. Being worn,
Auxiliary rollers 24 and 25 are rotatably attached to support shafts 77 and 78 inserted between the respective tip portions.
Then, the urging spring 27 in which the middle is wound around the support shaft 74.
The extended ends of the auxiliary roller arms 75a and 76, respectively.
By being hung on a, the roller surface of one of the auxiliary rollers 24 becomes the film feed amount detection rollers 22a and 22b,
The other auxiliary roller 25 is arranged so as to come into pressure contact with the rubber belt 20 of the spool shaft 19. These auxiliary rollers 24 and 25 both operate so as 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 means of 1a and 71b. That is, the auxiliary roller arm 71
The base end side of each of a and 71b is in the recess of the camera body 1, the base end is rotatably pivotally attached to the support shaft 70, and the tip end is the spool shaft in the film winding chamber 29. 1
9 and the film feed amount detection roller shaft 22 extend.

Then, the auxiliary roller arms 71a, 7a
An auxiliary roller 21 is rotatably attached to a support shaft 73 attached in parallel with the spool shaft 19 between the tip ends of the 1b. The auxiliary roller 21 has its roller surface covered with the rubber by the biasing spring 72 having one end wound on the auxiliary roller arm 71a and the other end wound on the camera body 1 by being wound around the support shaft 70 in the middle. The belt 20 is arranged so as to abut. The auxiliary roller 21 plays a role of assisting the spool shaft 19 when the film 52b is loaded by the rotation of the spool shaft 19.

First, as shown in FIG. 10, a film cartridge 5 having no perforation is loaded, and the film 5
When the rear lid 26 is closed after pulling out and mounting 2b, the leading end of the film 52b is arranged at the position shown in FIG. That is, the film 52b is provided with the rubber belt 20 wound around the spool shaft 19 and the biasing spring 2.
The tip end portion is sandwiched between the auxiliary belt 25 and the auxiliary belt 25 which gives the rubber belt 20 a pressure contact property. When the rear cover 26 is closed, the rear cover switch 103 (see FIG. 15) is turned on to start loading, as will be described later. That is, the spool shaft 1
9 rotates in the direction of the arrow .lambda.7, the rubber belt 20 and the auxiliary roller 25 rotate in the directions of the arrows .lambda.7 and .lambda.8, respectively.
It is wound around a spool shaft 19 as shown at 13.

At this time, that is, the film 52b
Is being loaded, the CPU 101
Is the DX code 5 by the contacts DX1a to DX12.
The information a is read to identify the type of the film 52b. Further, the film feed amount of the film 52b is measured by the pulse generation mechanism 60 for detecting the film feed amount,
When the feeding amount reaches a predetermined amount, the loading is stopped and the release standby state is entered. The state of the film 52b at this time is shown in FIG.

FIG. 15 is an electric circuit block diagram showing the configurations 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 of this embodiment, and has input terminals P1 and P1.
2 is connected to the release switch 102, and the terminals P3 and P4 are connected to the rear cover switch 103. Further, the contact springs 63a and 6a are connected to the input terminals P5 and P6, respectively.
A switch composed of 3b is connected. And the C
The PU 101 is constantly monitoring the signals input to the above-mentioned input terminals, and when a predetermined signal is input to these input terminals, the PU 101 performs an operation (described later) according to this.

Output terminals P7, P8, P of the CPU 101
9, P10, and P11 are the screen size switching motor drive circuit 104, the finder frame switching liquid crystal drive circuit 106, the film winding / rewinding drive circuit 107, the shutter drive circuit 109, and the film information display drive circuit, respectively. 111 is connected to the CPU 101
Controls the drive circuits by processing the signals input to the input terminals.

Drive circuit 1 for the screen size switching motor
Reference numeral 04 designates the screen size switching motor 41 at its output end.
Are connected to drive and control the switching motor 41 as described above. Further, the finder frame switching liquid crystal drive circuit 106 has the transmission type liquid crystal plate 32 connected to the output end thereof, 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 the film winding / rewinding motor 108 at its output end, and controls the drive of the motor 108 as described above. Further, the shutter drive circuit 10
A shutter 110 is connected to the output end of the device 9 to control the opening and closing of the shutter.

Further, the film information display section drive circuit 111 is connected to the film information display section 112 (see FIG. 19) at its output end, and drives and controls the display information of the display section 112 according to the instruction of the CPU 101. It is like this.

Further, the CPU 101 has, based on the code information obtained from the DX code 5a, the above-mentioned FIG.
8, the film number identification means 81 for identifying the number of film frames that can be photographed, the film latitude identification means 82 for identifying the film latitude as shown in FIG. 29, and the film sensitivity as shown in FIG. It has a film sensitivity identifying means 83 for identifying and a film type identifying means 84 for identifying the film form as shown in FIG.

These identification means are terminals P of the CPU 101.
101a, P101b-P112 through the contact DX
1a and DX1b to DX12 are connected. That is, the contacts DX1a and DX1b to DX12 are connected to the terminals P101a and P101b to P112, respectively, as shown in the figure. Of these, the contacts DX1a and DX1 are connected.
1b and DX7 are terminals P101a, P101b and P10
7 to the film type identification means 84,
The contacts DX2 to DX6 are connected to the film sensitivity identifying means 83 through the terminals P102 to P106, and similarly, the contacts DX8.
To DX10 are connected to the film number identifying means 81 through terminals P108 to P110, and further, contacts DX11 and DX.
12 are connected to the film latitude identifying means 82 via terminals P111 and P112, respectively.

The film number identifying means 81 and the film type identifying means 84 are respectively connected to the terminal P11.
3, the film frame number correcting means 88 through P114
It is connected to the.

FIG. 17 shows the film frame number correcting means 8
8 is a block circuit diagram showing a configuration of No. 8. The film frame number correction means 88 is a film frame number table table storage means 85, a film frame number table selection means 86,
It is composed of a film frame number storage means 87, and output terminals of the film number identification means 81 and the film type identification means 84 are the terminals P113 and P1 respectively.
It is connected to the input terminals P201 and P202 of the film frame number table selection means 86 through 14 (see FIG. 15).

This film frame number table table selecting means 8
6, the input end P203 is connected to the output end of the film frame number table storage means 85, and the output end P204 is connected to the film frame number storage means 87. When the information of the loaded film is received by the signals from 81 and the film type identification means 84, the table table storage means 85.
The correct film frame number is stored in the film frame number storing means 87 by referring to the data of the table stored in FIG. The film frame number table selection means 86 does not necessarily have to be an independent circuit. For example, the CPU 101
It may be formed inside.

The above-mentioned film frame number table table storage means 8
Reference numeral 5 is formed of, for example, a ROM in the control circuit of the camera, and stores the data of the number of film frames shown in the table table of FIG.

Here, A shown in the table above.
Explain the rationale for setting the number of frames for the type of film.

FIG. 21 has perforations,
It is the figure which showed the state of the screen a at the time of photography using the normal film 52a with the diagonal line. As shown in FIG. 21, the shooting screen size is 24 mm × 36 mm, and the interval between the shooting screen sizes is 2 mm. Therefore, 1
The film feed amount per frame is 38 mm. Also,
FIG. 22 shows the film 52 without the perforation.
It is a diagram in which the state of the screen b when shooting is performed using b is shown by diagonal lines. As shown in this figure, the shooting screen size is, for example, 29 mm × 40.75 mm, and the interval of each shooting screen size. Is 2 mm, the film feed amount per frame is 42.75 mm. Therefore, the film feed amount at the time of shooting with the size of the screen b is 42.75 / 38 times that of the screen a. Therefore, the number of A-type film frames is 38 / 42.75, which is the reciprocal of the above formula, with respect to the existing film, and the value shown in FIG.

The film frame number storage means 87 is formed of a storage element such as a RAM, for example, and the information of the film frame number stored in the storage means 87 can always be grasped by the CPU 101. ing. In this case, although not shown, the information of the film frame number may be directly transmitted from the storage means 87 to the CPU 101, or to the CPU 101 via the film frame number table selection means 86. It may be adapted to communicate.

The film information display section 112 (see FIG. 15) is formed of, for example, an LCD,
The display unit is provided outside the camera body 1. As shown in FIG. 19, the film information display unit 112 can display, for example, an ISO sensitivity 91, a shooting screen size display 92, a filmable film remaining number display 93, and the like. The display information is CP as described above.
It is controlled by the film information display unit drive circuit 111 which receives the information from U101. For example, as described above, the information on the number of frames in the number of remaining frames 93 of the film that can be photographed is always grasped by the CPU 101, and this information allows the remaining number of frames to be displayed correctly. The remaining number of remaining frames 93 is not limited to the display of the number of remaining frames of the film, and the current number of frames to be photographed may be displayed by, for example, a switching unit (not shown).

Among the operations of the camera of the present embodiment having the above-described structure, the film type identification by the film type identification means 84 will be described with reference to the flowchart of FIG.

First, the CPU 101 determines the contact DX1a.
It is determined whether or not the electrode range L1 of the DX code 5a of the film cartridge 5 loaded in the camera body 1 is an electrically conductive portion by determining whether or not the LED range is electrically connected to the DX1b (step S21). .. This step S21
In the above, if the contacts DX1a and DX1b are in conduction, the film cartridge has a DX code having a DX code.
If it is determined that the film is a film (step S22), and the contacts DX1a and DX1b are not electrically connected to each other, the film cartridge is determined to be a non-DX film having no DX code (step S26).

After step S22, the CPU 101
Determines the conduction between the contacts DX1a and DX7, that is,
The conduction of the electrode range L7 is determined (step S23). In this step S23, if the electrode range L7 is a conducting part, it is determined to be a normal DX film with normal perforation (step S25), and if the electrode range L7 is an insulating part, it is determined to be the A type DX film without perforation. Yes (step S24).

Next, the overall operation of the camera thus constructed in this embodiment will be described with reference to the flowchart of FIG.

First, the cartridge loading chamber 11 of the camera body 1
Then, the above-mentioned film cartridge 5 is loaded, the film 52b is pulled out from the film cartridge 5 to the above-mentioned predetermined position, and then the rear lid 26 is closed. Then, the rear cover switch 103 is turned on and an on signal is input to the CPU 101 (step S1). This causes the CPU 101 to
A control signal is output from the output terminal P9, and the film winding / rewinding drive circuit 107 which has received the control signal rotates the film winding / rewinding motor 108 to start the idling of the film 52b (step S2). ..

During this idle feeding, the CPU 101
Reads the information of the DX code 5a of the loaded film cartridge (step S3), and as described above, identifies the sensitivity of the film stored in the film cartridge, the number of frames that can be photographed, and the latitude, and Presence / absence is identified (see the flowchart in FIG. 16) (step S4).

In response to this result, the CPU 101 outputs a control signal from the output terminal P8 (see FIG. 15) to operate the finder frame switching liquid crystal drive circuit 106 to switch the display of the transmissive liquid crystal plate 32 (step S5). ). At the same time, the CPU 101 outputs a control signal from the output terminal P7 (see FIG. 15) to operate the screen size switching motor drive circuit 104 and rotate the screen size switching motor 41 to thereby change the shooting screen size. Is set to a predetermined size (step S6).

If the film has no perforation, the CPU 101 instructs the screen display of the transmissive liquid crystal plate 32 to be as shown in FIG. 7A, and the photographing screen mask switching mechanism. The mask size of 40 is made large, specifically, 29 mm x 40.7.
Instruct it to be 5 mm. At the same time, the CPU 101 sets the film winding / rewinding drive circuit 107 so as to increase the feed amount per frame of the film 52b (step S).
7).

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

As described above, when shooting is performed using the normal film 52a having the perforations shown in FIG. 21, the shooting screen size is 24 mm.
× 36 mm, the distance between each shooting screen size is 2 mm, so the film feed amount per frame is 38 mm
Becomes At this time, the film feed amount detection roller shaft 22
Is rotated 2.7 times, so that the number of pulse signals generated per one film in the pulse generation mechanism 60 for detecting the film feed amount is 16 detection rollers 22.
Determine the diameter of a and 22b.

When a film 52b without perforation as shown in FIG. 22 is used for shooting, the shooting screen size is, for example, 29 mm × 40.
75mm, and the interval of each shooting screen size is 2mm,
Since the film feed amount per frame is 42.75 mm, as described above, the film feed amount detection roller 22a,
When the diameter of 22b is determined, the detection rollers 22a, 22
In the case of b, three rotations are made per film frame, and the number of pulse signals generated in the pulse generation mechanism 60 for detecting the film feed amount is 18.

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

Film 52a with perforations
In this case, that is, when a normal film cartridge is loaded, the CPU 101 instructs the screen display of the transmissive liquid crystal plate 32 to be as shown in FIG. 7B, and the photographing screen mask switching mechanism. The mask frame of 40 is instructed to be reduced, specifically, to be 24 mm × 36 mm. At the same time, the CPU 1
Reference numeral 01 indicates a small feed amount per frame of the film 52a with respect to the film winding / rewinding drive circuit 107. Specifically, as described above, the pulse generation mechanism for detecting the film feed amount is used. The count number of the pulse signal from 60 is set to 16 so that one frame is fed. As a result, when a normal film cartridge, that is, a film 52a having a perforation is loaded, it is possible to shoot a normal shooting screen a as in a general camera.

Returning to FIG. 20, the operation of the CPU 101 will be described.

After step S7, the CPU 101
The film frame number stored in the film frame number storing means 87 is directly recognized through the film frame number table selection means 86 (step S).
8, see FIG. 18). Next, the number of film frames recognized is compared with the number of film frames taken, and the remaining number of film frames is displayed on the film information display unit 112 (step S9).

Up to this step S9, the initial operation of the camera is completed, and this camera enters the release standby state (step S10). After this, the release switch 102
When is turned on, the CPU 101 outputs a control signal from the output terminal P10 (see FIG. 15) to operate the shutter drive circuit 109 to open and close the shutter 110 (step S11). After that, the film winding / rewinding motor 108 is rotated to feed the film by one frame (step S12), and then the film end of the film is detected (step S13).

In step S11, if the end of the film is not detected and there is still a remaining amount of the film, the remaining number of remaining photographable films 93 (see FIG. 19) in the film information display section 112 is displayed. After reducing the number by one and displaying it (step S15), the above step S
Return to 9 and enter the release standby state. On the other hand, when the film end is detected in step S13, the CPU 1
01 sends an instruction to the film winding / rewinding drive circuit 107 to rewind the film (step S14).

In this embodiment, the electrode range L7
By determining the continuity between the electrode range L1a and the electrode range L1a, it is determined whether it is a normal normal DX film or a large screen A type DX film (see FIG. 16), and the contact DX7 that contacts the electrode range L7 is also determined. Contact points DX7a, DX7b
The CPU 101 has two contacts (not shown)
In addition to the above-mentioned identification means (see FIGS. 15 and 16), the film type identification means 84 in the above-mentioned two contacts DX7.
a and DX7b also have identification means,
Furthermore, another type of film, for example, a film having one perforation hole on one screen (hereinafter, referred to as B
It is also possible to determine whether or not it is a type of film) (see FIG. 30). In such a film, for example, when one perforation hole is provided between continuous shooting screens and the perforation hole is used for film locking, it is possible to increase the screen size and improve the film stop accuracy. Is effective for.

FIG. 31 shows the CPU 1 in the above case.
11 is a flowchart showing the operation of the film type identification means 84 in 01.

First, the CPU 101 determines whether or not the film cartridge loaded in the camera body 1 has a DX code by determining the continuity between the contacts DX1a and DX1b as in the flow shown in FIG. Is determined (step S31). In this step S31,
If the contacts DX1a and DX1b are electrically connected, CP
U101 determines the conduction between the contacts DX7a and DX7b,
That is, the conduction of the electrode range L7 is determined (step S
32). In this step S32, the electrode range L
If 7 is a conducting portion, it is determined to be a normal DX film with normal perforation (step S34), and if the electrode range L7 is an insulating portion, it is determined to be the A type DX film without perforation (step S34).
35).

In the step S31, the contact DX1a
And DX1b are not electrically connected to each other, the CPU 10
1 determines the conduction between the contacts DX7a and DX7b, that is, the conduction of the electrode range L7 (step S3).
3). In this step S33, if the electrode range L7 is a conducting part, it is determined to be the B type DX film (step S36), and if the electrode range L7 is an insulating part, a normal non-DX code is provided. It is determined that the film is a DX film (step S37).

Further, in FIG. 23, in order to perform the film loading more surely, the film 52c in which the perforation is provided only in the leader portion 52ca of the film front end portion of the film without perforation, and the film cartridge 54 containing this film 52c It is the figure which showed. 24A and 24B, a film hooking claw 19b is provided below the spool shaft 19 as shown in FIG.
2A is an explanatory view of the spool shaft 19a in which the spool shaft 19a is provided. FIG. 4A is a rear view of a film winding chamber 29a in which the spool shaft 19a is disposed, and FIG. FIG.

When the film 52c is mounted on the camera body 1 and loaded, the perforations in the leader 52ca are caught by the film catching claws 19b of the spool shaft 19a to wind the film, so that reliable loading can be performed. ..

[0105]

As described above, according to the present invention, whether the built-in film has a perforation,
When a film patrone that displays information about the type of film that has abolished the perforation is used and this information is read when the film is loaded and there is perforation in the film loaded in the camera body, the conventional standard Shoots at the shooting screen size, displays the standard number of shooting frames that can be shot, and when the loaded film does not have perforations, changes the screen size to a shooting screen size larger than the standard shooting screen size. At the same time, since the number of frames to be photographed is corrected and the number of frames to be photographed is displayed, it is possible to provide a photographing screen size switching camera that always displays the number of frames to be photographed correctly according to the loaded film.

[Brief description of drawings]

FIG. 1 is a rear view of a shooting screen size switching camera according to an embodiment of the present invention.

FIG. 2 is a front view of the shooting screen size switching camera of the above embodiment.

FIG. 3 is a vertical cross-sectional view of the mask portion in FIG.

FIG. 4 is a front view showing a film cartridge for storing a 35 mm wide film without perforation used in the camera of the above embodiment and a DX code of the film cartridge.

FIG. 5 is a table showing the relationship between the film form and the state of the electrode range when the electrode range, which is one of the ground parts in the electrode range of the DX code, is used as an identification code.

FIG. 6 is a perspective view of a finder optical system used in the camera of the above embodiment.

7A and 7B respectively show viewfinder field frames in the camera of the above embodiment, FIG. 7A is a front view of a field frame at the time of large-screen shooting, and FIG.

FIG. 8 is a front view of a photographing screen mask switching mechanism in the camera of the above embodiment.

FIG. 9 is a perspective view of a main part of a pulse generation mechanism for detecting a film feed amount in the camera of the above embodiment.

10 is a rear view of the camera shown in FIG. 1 showing a state in which a film without perforation is loaded.

FIG. 11 is a cross-sectional view of the essential parts showing the state of film loading in the camera of the above embodiment.

FIG. 12 is a cross-sectional view of essential parts showing a state of film loading in the camera of the above embodiment.

FIG. 13 is a cross-sectional view of essential parts showing a state of film loading in the camera of the above embodiment.

FIG. 14 is a cross-sectional view of essential parts showing a state of film loading in the camera of the above embodiment.

FIG. 15 is a block diagram showing a configuration of an electric circuit in the camera of the embodiment.

FIG. 16 is a flowchart showing an example of the operation of the film type identification means in the camera of the above embodiment.

FIG. 17 is a block circuit diagram showing the configuration of film frame number correction means.

FIG. 18 is a table table showing data stored in a film frame number table table storage means.

FIG. 19 is a front view showing an example of a display screen of a film information display section.

FIG. 20 is a flowchart showing the operation of the camera of the above embodiment.

FIG. 21 is a front view showing a shooting screen of a film having perforations.

FIG. 22 is a front view showing a shooting screen of a film without perforation.

FIG. 23 is a front view showing a 35 mm wide film in which perforations are provided only on the leader portion of the film.

24 (a) and 24 (b) are a front view and a sectional view of a take-up spool shaft around which the leader portion of the film of FIG. 22 is wound.

25 (a) and 25 (b) are front views showing the dimensions of a normal film with perforation according to the JIS standard.

FIG. 26 is a front view showing a film patrone for accommodating a 35 mm wide film having a current perforation and a DX code of the film patrone.

FIG. 27 is a table showing codes for identifying film sensitivity, which are included in specific electrode ranges of the DX code.

FIG. 28 is a table showing codes for identifying the number of films included in a specific electrode range of the DX code.

FIG. 29 is a table showing codes identifying the allowable latitude of a film, which are included in specific electrode areas of the DX code.

FIG. 30 is a table showing the relationship between the film form and the state of the electrode range when two electrode ranges, which are ground portions, of the electrode ranges of the DX code are used as identification codes.

FIG. 31 is a flowchart showing another example of the operation of the film type identification means in the camera of the above embodiment.

[Explanation of symbols]

 1 ... Camera body 2 ... Release button 5 ... Film cartridge 5a ... DX code 11 ... Patrone loading chamber 12 ... Fork portion 13 ... Finder eyepiece portion 14 ... Mask portion 15,16,17,18 ... Film rail 19 ... Spool shaft 20 ... rubber belt 21 ... auxiliary roller 22 ... film feed amount detection roller shafts 22a, 22b ... film feed amount detection roller 29 ... film winding chamber 30 ... finder optical system 40 ... shooting screen mask switching mechanism 52a ... with perforation Film 52b ... Film without perforation 60 ... Pulse generating mechanism for detecting film feed amount 88 ... Film frame number correcting means 112 ... Film information display section

Claims (1)

[Claims] 1. A camera using a film cartridge having film type data and photographing frame number data, comprising data reading means for reading each of the data when the film cartridge is loaded, and information of each of the data. Shooting screen size switching means for changing the size of the shooting screen according to the above, control means for correcting the number of shooting frames according to the information of each data, shooting frame number display means for displaying the number of shooting frames, A camera for switching a shooting screen size, comprising: