JP3151253B2 - camera - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE invention, the different screen sizes
Selectively use multiple image recording media such as film
It relates to a camera that can be used .

[0002]

2. Description of the Related Art In a typical 35 mm camera, a film cartridge loaded in the camera is used for 24 mm.
Normal 35 that can be photographed with a photographing screen size of × 36 mm
mm film roll film (hereinafter referred to as N-type film) and roll film (hereinafter referred to as A-type film) that can be photographed with a larger photographing screen size by eliminating perforation in the N-type film. It can be used.

In a camera that can use both the N-type film and the A-type film as described above, it is necessary to switch the size of the photographing screen according to the film to be used. It is conceivable to replace units such as the finder optical system and the focusing screen with the switching. Further, in this camera, it is necessary to load a film suitable for a shooting screen set on the camera side.

[0004]

However, in the case of the above configuration, various problems occur. That is, when a shooting screen suitable for an N-type film is set on the camera body, and a unit such as a finder optical system or the like is mounted thereon, the A-type film is loaded and shooting is performed as it is. This makes it impossible to observe the entire area of the photographing screen of the A-type film, and the photograph is finished with an image not intended by the photographer. Also, if you set a shooting screen compatible with A type film on the camera body and mount a unit such as a viewfinder optical system that fits it, and load N type film and shoot. However, a film perforation exists in the observation area of the photographer, and there is a problem that a photograph shows only an area smaller than an actual image. Furthermore, if an inappropriate unit such as a viewfinder optical system is attached to the selected shooting screen size and film, the size of the screen actually shot and the size of the screen observed by the photographer may differ. There is also a problem that it is lost.

An object of the present invention is to select a photographing screen size.
And camera elements such as camera viewfinder optical units
If you use a recording medium such as a film that is not compatible
An object of the present invention is to provide a camera that is easy for photographers to use, for example, by issuing a warning in such a case.

[0006]

The camera according to the present invention comprises:
Depending on the shooting screen size specific to the image recording medium used,
At least a first shooting screen size and the first shooting screen size
Shooting screen size that is smaller than the shooting screen size
In switchable camera size, and the screen size switching means for setting switching the shooting screen size according to the image recording medium to be used, relative to the set photographing screen size,
Warning means for issuing a warning when any of the plurality of detachable camera elements do not match , wherein the warning means
Characterized by the fact that warnings can be observed in the viewfinder ,
Also, the shooting screen size set in the viewfinder
View range switching means that allows the view range corresponding to
Wherein the image recording medium further comprises:
A film wound in a cartridge,
If a warning is issued by the notification means,
Loading is not performed. Further, the camera according to the present invention provides a shooting screen specific to the image recording medium used.
Depending on the size, at least the first screen size and the first screen size
The second is a shooting screen size smaller than the screen size of
In a camera switchable to a screen size , the first
A first finder unit that can handle a screen size;
A second viewfinder that can correspond to the second screen size.
Findings that can be selectively installed with either knits
Take the knit mounting part and the finder unit mounting part
The attached finder unit is
Identifying means for identifying whether the knit, the said identification means
When the first screen size is set,
Identifies that the second finder unit is installed
Warning means for issuing a warning when the
Further, the warning issued by the warning means is
Viewfinder display means for displaying in the viewfinder ;
The warning issued by the warning means is applied to the surface of the camera.
Display means for displaying.

[0007]

[Operation] In the present invention, the shooting specific to the image recording medium used is specified.
At least the first shooting screen size according to the shadow screen size
And a shooting screen size smaller than the first shooting screen size.
In the second photographing screen switchable cameras and the size is a diagram, a picture-format in accordance with the image recording medium is switched set by the screen size switching means, with respect to the set photographic screen size used, desorption If any of the possible camera elements do not match, a warning is issued by a warning means and this warning is observed in the viewfinder.
Also, in the present invention, a photographed image specific to an image recording medium to be used is
According to the screen size, at least the first screen size and the
The second, which is a shooting screen size smaller than the first screen size
In the switchable camera to the screen size, fine
Finder unit attached to the unit mounting part
Is a first fine screen that can correspond to the first screen size.
Or the second screen size above
Identifies the second finder unit by the identification means
Then, the first screen size is set by the identification means.
The second finder unit is
A warning is issued by the warning means when the
I do.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiments. FIG. 1 is a block diagram of an electric circuit of a photographing screen size switching camera showing one embodiment of the present invention.
Are a camera body 1 of the above-mentioned camera, an interchangeable lens 4, a focusing screen unit (hereinafter, referred to as a screen unit) 6A (6B) and a finder optical system unit (hereinafter, referred to as a finder unit) 3A (3B).
FIG. 2 is an exploded perspective view showing a separated state.

This camera has an interchangeable lens 4 and a screen unit 6A with respect to a camera body 1 as shown in FIG.
(6B) and a finder unit 3A (3B) are detachably mounted to constitute a single-lens reflex camera, and use a normal type JIS 135 type roll film (N type film) having a perforation. Shooting with a standard screen size of 24 mm x 36 mm (hereinafter referred to as N mode)
Using a non-perforated non-perforated roll film (A-type film) that is stored in a patrone of the same size as a 5 type roll film, 29mm x 41mm
The photographing of a screen size larger than the standard screen size (hereinafter, referred to as L mode) can be performed by switching. As shown in FIG. 1, a CPU for electrically controlling the operation of the camera of this embodiment is provided in the camera body 1.
The CPU 101 includes a lens information processing unit 102, an exposure calculation unit 103, a viewfinder identification unit 104, a film feed amount switching unit 105, a viewfinder information display liquid crystal drive unit 106, and a film feed amount. Counting means 107, screen identification means 108, field frame display liquid crystal driving means 109, film number identification means 110, film sensitivity identification means 111, film type identification means 112, film latitude identification means 113
Is built-in.

The CPU 101, which is a controller for controlling an electric circuit of the camera, has input ports P1 and P2.
Release switch 114, and input ports P3, P
4 are connected to switches 115 for detecting the opening and closing of the rear cover of the camera, respectively, and input ports P5, P6, and P7.
Is connected to a switch 116 for switching the photographing screen size between the N mode and the L mode. In accordance with the switching operation of the switch 116, the film feed amount switching means 105 appropriately controls the film feed amount. At the same time, the drive circuit 118 for the photographing screen size switching motor connected to the output port P11 is driven to switch the switching motor M1.
To control the rotation and switch the shooting screen size. And
Contact springs 63 of a pulse generating mechanism 60 (see FIG. 6) for detecting a film feeding amount described later are provided at the input ports P8 and P9.
a and 63b are connected. A motor M2 for film winding and rewinding is connected to the output port P10.
And a rewind drive circuit 117 for driving the film winding.

Further, a shutter 12 is connected to the input port P12.
0 is connected to the shutter drive circuit 119, and a forced loading switch 123 described later is connected to the input ports P14 and P15. When the switch 123 is turned on, loading is started.
The top shot is prepared. And the input port P13
Is connected to an external information display liquid crystal circuit 121 for driving the external liquid crystal display panel 122.

A finder identification means 1 provided in the CPU 101 for identifying the type of a finder.
04, a screen identifying means 108 for identifying the type of the focusing screen, and a film type identifying means 112 for identifying the type of the film.
Determines the suitability of the finder, focusing screen, and film for the selection of the photographing screen size, and displays them on the finder liquid crystal display panels 73a and 73b and the external liquid crystal display panel 122 in the finder unit 3A (3B). Play a role.

When the interchangeable lens 4 is mounted on the camera body 1, the CPU 101 connects the lens data ROM 124 and the like in the lens via electric contacts of a connector 4b provided on a lens mount. When the finder unit 3A (3B) is mounted on the camera body 1, the finder data ROM 126 provided in the unit, a liquid crystal panel 73a (73b) for displaying information in the finder (see FIGS. 16 and 19),
A photometric circuit 127 including a photometric sensor and the like are connected via electrical contacts of a connector 3d provided in the finder unit.
When (6B) is mounted on the camera body 1, the screen type display circuit 130 provided in the unit and the view frame switching liquid crystal display panel 12 (see FIG. 13) connect the electrical contacts of the connector 6a provided in the screen unit. Is to be connected via

The input port P1 of the CPU 101
01a, P101b, and P102 to P112 have electrical contacts DX for reading a DX code disposed on the back wall of a film supply chamber 5 (see FIG. 4) of the camera body 1 described later.
1a, 1b and DX2 to DX12 are connected respectively. The reading electrical contacts DX1a, 1b, DX2 to DX
Reference numeral 12 denotes a film code identifying means 110 for reading the DX code written on the film cartridge and identifying the number of films in the CPU 101, a film latitude identifying means 113 for identifying the latitude of the film, and a film sensitivity identifying means for identifying the film sensitivity. DX code information is supplied to the film type identification means 112 for identifying the type of the film 111 and the film type. In addition,
The reading electrical contacts DX1a and DX1b have two contacts so as to obtain a photographing screen corresponding to the film, as described later.

As shown in FIG. 2, the above-mentioned camera body 1 having the CPU 101 and the peripheral circuits constructed as described above has a release button 2, a number of frames to be shot,
The external liquid crystal display panel 122 and the like for displaying a camera mode such as a shooting mode and a warning display to be described later are provided, and a lock release knob 9 of the finder unit 3A (3B) is provided on the other side. . A lens mounting mount is provided at the center of the front surface of the camera body 1, and the interchangeable lens 4 in which the ROM 124 that stores data such as the open aperture value and the focal length of the lens is provided.
Is detachably mounted by the bayonet mount 4a. When the lens is mounted, the ROM on the lens side is connected by the connector 4b.
Reference numeral 124 is connected to the group of electrical contacts 1a on the camera body, and communicates the data.

At the center of the upper surface of the camera body 1, a mounting portion 1k for interchangeably mounting the screen unit 6A (6B) and the finder unit 3A (3B).
Are formed. The mounting portion 1k is formed above the mirror box of the camera body 1, and is superimposed on the screen unit fitting hole 1m formed of a horizontally long rectangular opening and directly above the fitting hole 1m. And a finder unit mounting hole 1n having an open rear. The screen unit fitting hole 1m has a receiving portion 1p formed of a frame-shaped edge formed at the bottom thereof to receive and support the screen unit 6A (6B) dropped from above.
That is, the screen unit 6A (6B) is mounted by being pushed in the direction of λ11 above the mirror box. Also, the finder unit mounting hole 1n
Have dovetail grooves 1q, 1q for fitting formed on the inner surfaces on both sides thereof, and dovetails 3a, 3b formed by projecting on both sides of a lower frame of the finder unit 3A (3B). 1q, 1q is attached by sliding from behind and mounting. That is, the finder unit 3A (3B) puts the dovetails 3a, 3b in the direction of λ12 from behind the camera in the dovetail grooves 1q, 1q.
To be exchangeably attached to the camera body 1. Then, the finder unit 3A (3
B) is not shown, but is provided with a lock mechanism so that it cannot be removed carelessly. When the finder unit is replaced, the lock release knob 9 is operated to enable removal. I have.

The screen unit includes a unit 6A for both L and N modes in which a field frame can be switched by a transmissive liquid crystal display panel 12 as described later (see FIG. 13).
And a small unit 6B (see FIG. 14) dedicated to the N mode. A terminal plate 7a is attached to a side surface of the frame 7. Also, the above finder unit has
There are two types, an L mode finder unit 3A (see FIG. 16) that covers the L mode field of view, and a small finder unit 3B (see FIG. 19) dedicated to the N mode. A photometric sensor is built in, and an electrical contact group 3c for transmitting the photometric information, the information indicating the type of the finder, and the like to the camera body 1 is provided at the lower part on the front surface.

FIG. 3 shows that a screen unit 6A supporting a condenser lens 8, a transmissive liquid crystal panel for switching the visual field frame, a screen having a matte surface, etc., is dropped into the screen unit fitting hole 1m in the frame body 7. FIG. 3 shows a state in which the camera is mounted on the camera body 1. The upper side of FIG. 3 is the rear side of the camera, and the lower side is the front side of the camera. The frame 7
Is formed of a horizontally-long rectangular frame slightly smaller than the screen unit fitting hole 1m, and a right wall (a left wall in FIG. 3) and a rear wall of the inner surface of the screen unit fitting hole 1m. And projections 1b and 1c serving as reference surfaces are formed at the same time, and are urged to project to the left wall (the right wall in FIG. 3) and the front wall by springs (not shown), respectively. The screen unit 6A provided with the pins 1d, 1e, 1f, and 1g and dropped into the fitting hole 1m is pressed toward the protrusions 1b and 1c by the pins 1d, 1e, 1f, and 1g. As a result, it is designed to be mounted at a regular position. In this mounted state, the electric contact terminals of the terminal plate 7a come into contact with the electric contact pins 11a to 11d which are urged to protrude into the unit fitting hole 1m.

The screen unit fitting hole 1 m
An electrical contact group 1h that comes into contact with the electrical contact group 3c (see FIG. 2) of the finder unit is disposed near one side of the front wall of the finder unit mounting hole 1n formed above the finder unit. When the unit is mounted and locked, the electric contact group 3c and the electric contact group 1h come into contact with each other.

FIG. 4 is a rear view of a single-lens reflex camera capable of switching a photographing screen size according to one embodiment of the present invention, with a rear lid removed. On the left side of the camera body 1, a patrone loading chamber 5 serving as a film supply chamber is provided.
Are formed on the back wall of the same room 5, and the above-mentioned electrical contacts DX1a, 1b, DX2 to DX2 for reading the DX code 53a (see FIGS. 7 and 8) for identifying various information of the film.
X12 is provided. These contacts are formed of conductive contacts, and when a film cartridge is loaded, each electrode range L1 to L1 of the DX code 53a.
2 respectively. As will be described later, the contact point DX1 is composed of two contact points DX1a and DX1b arranged close to each other to detect whether or not the cartridge has a DX code. A fork member 5a for electrically rewinding the film is provided on a ceiling wall of the patrone loading chamber 5.
When the film is rewound, it is driven by a motor M2 (see FIG. 1).

Then, on the center rear side of the camera body 1,
A mask portion 32 is formed to be a photographing screen range. In the present embodiment, the mask portion 32 has a vertical dimension of 29 mm and a horizontal dimension of 41 mm in order to cope with L-mode imaging, whereby the imaging screen has a shape similar to the ISO standard A-size paper size. , The aspect ratio is set to 1: 1.4. Also, by setting the above dimensions, the diagonal length of the shooting screen becomes about 50.0 mm, which is longer than the conventional diagonal length of the shooting screen of about 43.3 mm. This mask part 32
A vertical running focal plane shutter 31 is provided in the camera inside the camera. Further, between the focal plane shutter 31 and the mask unit 32, a photographing screen mask switching mechanism 40 described later is provided. It is arranged.

On the opposite side of the patrone loading chamber 5 with respect to the mask section 32, a film winding chamber 29 is provided. In the film winding chamber 29, a film of the same type as a normal camera is provided. A winding spool shaft 19 is provided. A rubber-like belt 20 having a large frictional force is wound around the center of the spool shaft 19 to ensure film loading even for a film having no perforation. When the film cartridge is loaded into the cartridge loading chamber 5 and the film leader unit pulled out from the cartridge is closed and the rear lid of the camera is closed, the spool shaft 19 is turned on.
5 (see FIG. 1) is turned on, and at the same time, the built-in winding / rewinding motor M2 operates according to the instruction of the CPU 101 (see FIG. 1).
, The film is automatically rotated in a predetermined direction to perform empty winding including a film leader portion, and at the time of photographing, one frame of film that has been photographed is wound. The camera body 1 is attached to the spool shaft 19.
An auxiliary roller 21 whose support shaft is swingably supported is arranged with its roller surface in contact with the surface of the rubber belt 20. The auxiliary roller 21 is connected to the spool shaft 19.
When the film is loaded by the rotation of, the roll assists 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 mask portion 32 near the auxiliary roller 21. When the film 52a (52b) (see FIGS. 7 and 8) is loaded on the upper and lower portions of the shaft 22 with detection rollers 22A and 22b formed of rubber having a large frictional force, respectively, The abutment rotates in conjunction with the loading of the film. As described above, the film feed amount detecting roller shaft 22 rotates according to the film feed amount. A rotating plate 61 of a pulse generating mechanism 60 for detecting a film feeding amount, which will be described later, is provided on an upper shaft portion 22c of the film feeding amount detecting roller shaft 22 that extends into the camera body 1.
Is fixed, and generates a pulse signal corresponding to the rotation amount of the feed amount detecting roller shaft 22, whereby the CPU 101 measures the film feed amount. .

The screen size changeover switch 116 is provided at a lower position near the patrone loading chamber 5. When the switch 116 is moved to the right side in the figure and switched, the mode is switched to the large screen size L mode, and when switched to the left side, the mode is switched to the normal screen size N mode. In FIG. 4, since it is set to the L mode on the right side,
The screen size switching mask frame is the mask section 3 of the camera body 1.
Moving outside of 2. The switch 116 is set before the film cartridge is loaded. Further, when the rear lid is closed, it is covered by the rear lid, so that the switching operation cannot be performed after the rear lid is closed.

At a position below the switch 116, a forced loading switch 123 for photographing an A-type film in N mode as described later is provided so as to be operated from outside the camera. Since the forcible loading switch 123 is not usually used much, it is constituted by a concave push button switch. FIG. 5 shows the configuration of the photographing screen mask switching mechanism 40. The mask switching mechanism 40 is disposed between the focal plane shutter 31 and the mask section 32 as described above, and switches the size of the mask between the large screen and the normal screen by operating the screen size switching motor M1. It has become. Screen size switching motor M
Reference numeral 1 denotes a screen size switching motor drive circuit 118 (see FIG. 1) which operates according to an instruction from the CPU 101.
The rotation is controlled. This motor M
The first output gear 42 is rotatably meshed with a pinion 43, and the pinion 43 is further rotatably meshed with a pinion 44. 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 mask frames 4
Projecting pieces that extend diagonally from each other are formed at both ends of 7 and 48, and racks 47a and 48a are formed at the edges of the projecting pieces that extend diagonally downward. The pinions 43 and 44 are engaged with the racks 47a and 48a, respectively. The projecting pieces extending obliquely downward and obliquely upward are provided with guide slots 47b, 48b and 47c, 48c in parallel with the moving directions of the mask frames 47 and 48, respectively. The long holes are fitted into guide pins 45 and 46 fixed to the camera body.

When the motor M1 rotates in the direction of the arrow λ1, the pinions 43 and 44 rotate in the directions of the arrows λ2 and λ3, respectively. Rack 47
a and 48a move in the directions of arrows λ4 and λ5, respectively. As a result, the mask frames 47 and 48 move inside each other to make the inside of the frame smaller, and the mask frame has a normal screen size. The screen size switching motor M1
Is rotated in the direction opposite to the arrow λ1, the mask frames 47 and 48 move out of the mask section 32 in the opposite direction, that is, in the direction in which the inside of the frame becomes larger, and the mask frame 32 has a large screen size. A mask frame is formed.

FIG. 6 shows a structure of the pulse generating mechanism 60 for detecting the film feed amount. The rotating plate 61 is fixed with the upper shaft portion 22c of the film feed amount detecting roller shaft 22 as a support shaft as described above, and rotates by the rotation of the coaxial 22, that is, according to the film feed amount. It has become. As shown, conductive foils 61a are alternately attached to the upper surface of the rotating plate 61 radially from the central shaft portion. In this embodiment, the conductive foil 61
Although a is affixed to six sheets, it is a matter of course that the present invention is not limited to this.

On the upper surface of the rotary plate 61, contact springs 63a and 63b formed of elastic conductive wires and having their bases fixed to contact spring support portions 62 fixed to appropriate positions of the camera body 1 are provided. The rotating plate 61 is disposed in a direction parallel to a tangent line. 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, and the contact points of the contact springs 63a and 63b are set at the apexes of the curved portion. The rotating plate 61 is opposed to the upper surface of the rotating plate 61. These contact springs 63a, 6
3b are input terminals P of the CPU 101, respectively.
8, P9 (see FIG. 1)
A pulse signal generated by a short circuit between the conductive foils 3a and 63b by the conductive foil 61a is input.

The pulse generating mechanism 60 constructed as described above
When the loaded film is loaded, the film feed amount detecting roller shaft 22 rotates in accordance with the feeding of the film, and the rotary plate 61 rotates in the direction of the arrow .lambda.6 shown in FIG. At this time, the contact points of the contact springs 63a and 63b are alternately short-circuited by the conductive foil 61a to generate a pulse signal. Thus, the CPU 101 can know the film feeding amount by observing the pulse signal.

FIGS. 7 and 8 show roll films 52a and 52b used in the camera of the present invention, respectively. The roll film 52a shown in FIG. 7 is a normal type used in the N mode, and is a normal JIS 135 stored in the cartridge 53 on which the DX code 53a is displayed.
Roll film 52b shown in FIG.
Is an A type film used in the L mode, and is a large screen having the same width as the 135 type film and having no perforations at both upper and lower edges, which is housed in the normal JIS 135 type film patrone 53 displaying the DX code 53a. This is a film for photography. These two films 52a, 5
2b is the DX code 53a displayed on the patrone 53
Can be used to identify which film it is. That is, the DX code 53a is formed by dividing the electrode ranges L1 to L12 of the electrode group arranged in two rows into a conductive portion and an insulating portion, and the conductive portion exposes the metal background of the patrone 53 itself. The insulating portion is formed by applying insulation coating on the metal surface. Then, as shown in FIG. 9, the normal or N-type film 52a or the A-type film 52b for a large screen is identified based on whether the electrode range L7 of the DX code 53a is conductive or non-conductive. For example, in the case of a normal type film (see FIG. 7), the electrode range L1 and the electrode range L7, which are ground electrodes, are conductive parts. In the case of an A type film (see FIG. 8), only the ground electrode range L1 is conductive. In the portion, the electrode range L7 is formed by an insulating portion.

FIG. 10 is a flowchart of the DX code reading for reading the DX code 53a of the patrone 53 loaded in the film supply chamber 5 with the reading electrical contacts DX1a, 1b and DX2 to DX12. The film type identification means 112 in the CPU 101 identifies the film based on the read signal. First, it is determined whether or not the cartridge loaded in the film supply chamber 5 has the DX code 53a by determining the continuity between the contacts DX1a and DX1b (step S41). In this step S41, the contacts DX1a and DX1b
Is connected, the loaded cartridge has the DX code 53a (step S42), and then the CPU 101 determines the continuity between the contacts DX1a and DX7, that is, determines the continuity of the electrode range L7. Check (step S43). In this step S43, if the electrode range L7 is a conductive portion, it is determined that the normal type DX film has normal perforation (step S45), and if the electrode range L7 is an insulating portion, the A type film has no perforation. It is determined to be a DX film (step S44). If the contacts DX1a and DX1b are non-conductive in step S41, the CPU 101 determines that the film is a non-DX film having no DX code 53a (step S46) and performs processing. In this DX code reading operation,
The number of films, the latitude of the film, and the film sensitivity represented by the DX code are simultaneously determined by the CPU.
The number-of-films identification means 110, the film latitude identification means 113, and the film sensitivity identification means 111 in 101
Is read and identified by

FIG. 11 is a diagram in which a screen size a when a photograph is taken using a normal film 52a having a perforation is indicated by oblique lines, and FIG. 12 is a photograph taken using a film 52b without a perforation. FIG. 13 is a diagram showing a screen size b when hatching is performed by hatching. FIG.
As shown in the figure, the photographing screen size a of the perforated normal film 52a is 24 mm × 36 m
m, and the interval between each photographing screen size a is 2 mm. Therefore, the film feed amount per frame is 38 mm
At this time, the film feed amount detection roller shaft 22
Is rotated 2.7 times, and the pulse generating mechanism 60 for detecting the film feeding amount generates 16 pulse signals per frame. As shown in FIG. 12, in the case of the A type DX film 52b without perforation, the shooting screen size b is 29 mm × 4.
1 mm, the interval between each shooting screen size b is 2 mm,
Accordingly, the film feed amount per frame is 43 mm, and at this time, the film feed amount detection roller shaft 22 is set at 3 mm.
When rotated, the pulse generating mechanism 60 for detecting the film feed amount generates 18 pulse signals per frame.

FIG. 13 shows the structure of the screen unit 6A corresponding to both the L and N modes.
A condenser lens 8, a screen 11 having a matte surface, a transmissive liquid crystal panel 12 for switching the visual field frame, and a fixed visual field mask 13 are provided in a frame body 7 mounted in the screen unit fitting hole 1m of the camera body 1. , In this order. A terminal plate 7a attached to the side surface of the frame 7 has a screen classification terminal 7a.
b, 7c and liquid crystal drive terminals 7d, 7e.
In the case of the screen for the L mode, the terminals 7b and 7
Although not shown, c is short-circuited inside the frame 7.

FIG. 14 shows the structure of a screen unit 6B dedicated to the N mode. In this unit, a condenser lens 8, a screen 11 having a matte surface, and a fixed visual field mask 14 are stacked and arranged in this order in a frame 7. In this unit, since the field mask 14 is smaller than that for the L mode shown in FIG. 13, the condenser lens and the screen may be smaller. Further, there is no liquid crystal plate because switching of the field frame is unnecessary. For this reason, the terminal plate 7a is formed of an insulating plate having no terminals. As a result, as shown in FIG.
When the electric contact pins 11a and 11b are electrically connected to each other when mounted in the screen unit fitting hole 1m, a screen for L is used.
If it is not conductive, it can be distinguished from the N screen.

FIG. 15 is a diagram showing how the field of view of the L screen is switched. An area indicated by reference numeral 15 is a 29 mm × 41 mm field of view for a large screen formed by the field mask 13 and is used for imaging in the L mode. The portion indicated by reference numeral 16 is the transmissive liquid crystal panel 1 for switching the field frame.
2 (see FIG. 13) is a portion that becomes opaque when driven,
A 24 mm × 36 mm field frame 17 (shown by a dotted line) used for N-mode imaging is formed.

FIG. 16 shows the structure of the finder unit 3A for the L mode. The finder light-shielding frame 71a disposed opposite to the lower surface of the pentaprism 72a has
It is formed slightly larger than the field frame 13 of FIG. The pentaprism 72a is also formed larger than the conventional one in order to correspond to the L mode. A finder information display liquid crystal plate 73a for displaying information such as an aperture value, a shutter speed value, a photographing mode, and a film to be used in the finder is disposed immediately above the pentaprism 72a. An optical system for guiding the information into the finder optical system is disposed immediately before the pentaprism 72a. That is, this optical system is composed of, in order from the top, a parallel prism 74a, a relay lens system 75a, and a reflection prism 76a, and the above information is passed through the lower part in the pentaprism 72a and the eyepiece 77a as shown in FIG. Are displayed in the viewfinder. Also, this finder unit 3
A includes a ROM 126 storing various data including information indicating the type of the photometric sensor 78a and the viewfinder.
And a photometric circuit 127 (see FIG. 1).

FIG. 17 shows a state when the finder for L in FIG. 16 is viewed. In the display information 81 on the liquid crystal panel 73a for displaying information in the viewfinder, an aperture value 82, a shutter speed value 83, a shooting mode and a display section 84 of a film used are displayed in the viewfinder view. The field frame in the viewfinder is switched between the L mode field frame 15 and the N mode field frame 17 as described with reference to FIG.

FIG. 18 is an enlarged view of the photographing mode in the display information 81 and the display portion 84 of the film to be used. The display unit 84 includes an L mode display unit 84a formed in a horizontally long rectangular frame for lighting and displaying the L mode.
An N-mode display portion 84b, which is arranged at the center of the L-mode display portion 84a and is formed in a small horizontally long rectangle for lighting and displaying the N-mode;
A-type film display unit 84c and N-type film display unit 84 arranged side by side below a and 84b.
d. A-type film display section 8
4c is formed of the capital letter L of the alphabet, and the N-type film display section 84d displays the letter N of the alphabet.
It is formed by capital letters. Then, the display section 84c
When lit, it indicates that an A-type film is loaded, and when the display unit 84d is lit, it indicates that an N-type film, that is, a normal-type film is loaded. These displays are also displayed in exactly the same way on the external liquid crystal display panel 122 shown in FIG. 2, so that they can always be checked not only in the viewfinder but also outside the camera. ing.

FIG. 19 shows the structure of the finder unit 3B dedicated to the N mode. This finder unit 3B is also a finder unit 3A for the L mode.
Has a structure similar to that of the above. That is, a finder light-shielding frame 71b is arranged opposite to a lower surface of the pentaprism 72b, and information such as an aperture value, a shutter speed value, a photographing mode, and a film to be used is stored in the finder immediately before the pentaprism 72b. A finder information display liquid crystal plate 73b for displaying the above information is provided, and an optical system for guiding the information into the finder optical system is provided immediately before the pentaprism 72b. This optical system includes, in order from the top, a parallel prism 74b, a relay lens system 75b, and a reflection prism 76b. The information is transmitted to the finder through the lower part of the pentaprism 72b and the eyepiece 77b as shown in FIG. It is designed to be displayed in the field of view. In the finder unit 3B, an RO storing various data including the photometric sensor 78b and information indicating the type of the finder is stored.
It is the same that the M126, the photometric circuit 127 (see FIG. 1) and the like are built in. Note that the identification information for exclusive use in the N mode is stored in the ROM 126. And
The finder unit 3B is formed to be small in size as compared with the L mode for the L mode. The finder unit 3B and the screen unit 6B
Can be formed in the same size as a normal single-lens reflex camera when it is mounted on the camera body 1, and it is convenient to carry.

FIG. 20 shows a state when the finder of the finder unit dedicated to the N mode shown in FIG. 19 is viewed. The display information 81 in the finder is also displayed in exactly the same manner as in FIG. You. That is, the aperture value 8
2, a shutter speed value 83, a photographing mode and a display section 84 of a film to be used, and the like are displayed in the finder field, and the field frame in the finder is a field frame 17 for the N mode.
Is displayed.

Next, the actual operation of the camera according to the above-described embodiment will be described. First, as shown in FIG. 4, the rear cover is opened and a mode of a screen size to be photographed is selected. That is, with the rear cover opened, the screen size switch 116 is switched to the mode of the screen size desired to be photographed. FIG. 21 is a flowchart showing the operation when the L mode is selected, and FIG. 22 is a flowchart showing the operation when the N mode is selected.

First, the operation when the L mode in FIG. 21 is selected will be described. When the screen size changeover switch 116 is switched to the L side (step S1), the screen size changeover motor drive circuit 118 (see FIG. 1) operates to operate the motor M.
1 drives the screen size switching mechanism 40 (see FIG. 5), and sets the screen size to the L mode size (step S2). Next, the CPU 101 identifies the finder unit mounted on the camera body 1 (step S).
3) If this is the finder unit 3A for the L mode, the L mode display section 84a is turned on to indicate that the mode is the L mode (step S4). When the N mode finder unit 3B is mounted, the arrow L mode display section 84a is operated to display that the camera is set to the L mode. Since you cannot see the entire field of view,
The mode display section 84a blinks to display a warning (step S5). Therefore, the photographer can thereby set the finder unit to the finder unit 3A for the L mode.
Can be replaced with

Next, the CPU 101 identifies the screen unit (step S6). And this is L,
In the case of the screen unit 6A for the N mode (see FIG. 13), the liquid crystal panel 12 for the view frame is turned off to make the view frame 15 for the L mode (see FIG. 15) (step S7).
In the case of the screen unit 6B for the N mode (see FIG. 14), since the entire field of view cannot be seen,
The mode display section 84b blinks to display a warning (step S8). Therefore, the photographer may replace the screen unit with the screen unit 6A for the L and N modes.

Next, a film is loaded and the rear cover is closed (step S9). Then, the CPU 101 reads the DX code 53a displayed on the film cartridge 53 (see FIGS. 7 and 8) and identifies the film type (step S10). If this is an A-type film, the A-type film display section 84c is turned on (step S11) to indicate that the selected mode is compatible with the film type, and then the film loading is started (step S11). Step S12). Then, the first frame of the film is set, and preparation for photographing is completed (step S13). Also, when an N-type film is loaded, L-size shooting is not performed correctly,
At this time, the normal type film display section 84d blinks and a warning is issued (step S14), and the loading of the film is stopped (step S15).

When the L mode is selected as described above, if the combination of the finder units is inappropriate, a warning is displayed by flashing the L mode display portion 84a in step S5, and if the combination of the screen units is inappropriate. In step S8, the N-mode display unit 84b
Blinks to display a warning. Further, the type of the loaded film is identified and displayed, and when the selected mode and the type of the film are incompatible, the normal type film display portion 84d flashes and is displayed in step S14, and the used film is inappropriate. Display that there is something.

FIG. 22 is a flowchart showing the operation when the N mode is selected. In this case, first, the screen size switch 116 is switched to the N side (step S21). Then, the screen size switching motor drive circuit 118 (see FIG. 1) operates to drive the screen size switching mechanism 40 (see FIG. 5) by the motor M1, and sets the screen size to the N mode size (step S22). In the N mode, no problem occurs even if the finder unit for the L size is used, so that the finder unit need not be identified, so that it is not performed. Therefore, step S
At 23, the N-mode display portion 84b in the viewfinder and on the external liquid crystal panel 122 is turned on. Then CPU
101 identifies a screen unit (Step S)
24). If this is the screen unit 6A for the L and N modes (see FIG. 13), the liquid crystal panel 12 for the viewing frame is turned on to switch to the viewing frame 17 for the N mode (see FIG. 15) (step S25).

The screen unit 6 for the N mode
In the case of B (see FIG. 14), since there is no problem, the process shifts to step S26 to load a film and close the rear lid.
Then, the CPU 101 reads the DX code 53a displayed on the film cartridge 53 (see FIGS. 7 and 8) and identifies the film type (step S2).
7). If this is a normal type film, the normal type film display section 84d turns on the inside of the finder and the external liquid crystal panel 122 (step S28).
It indicates that the selected mode and the film type are compatible, and then starts film loading (step S29). Then, the first frame of the film is set, and preparation for photographing is completed (step S30). When an A type film is loaded, N
At this time, the A-type film display portion 84c blinks and a warning is issued (step S31), and the loading of the film is stopped (step S32).

At this time, if photographing for the N mode can be performed on the A type film, the process proceeds to step S33.
After confirming the mode, the forced loading switch 12
3 (see FIGS. 1 and 4) is turned on (step S34),
In step S35, the inner and outer liquid crystal plates 12
In step 2, the A-type film display section 84c is turned on, and the process goes through steps S29 and S30 to prepare for photographing.

When the N mode is selected in this way, the type of the loaded film is identified and displayed, and if the selected mode and the type of the film are incompatible, the A type film display is performed in step S31. The portion 84c blinks to indicate that the film used is inappropriate.

FIG. 23 is a table showing the shooting mode and the operation of the display unit 84 of the film to be used. As described above, according to this embodiment, the combination of the selected shooting mode and the viewfinder, screen, and film can be clearly confirmed, and a warning can be generated for an incorrect combination. As shown in this table, when the finder unit 3B for the N mode and the screen unit 6B for the N mode are mounted in the L mode setting, both the L mode display portion 84a and the N mode display portion 84b are provided. Blinks.

Although the warning display in the above embodiment is performed by the display means provided in the viewfinder unit or on the outer surface of the camera, it is needless to say that the warning may be made by voice.

[0052]

As described above, according to the present invention, photographing
Select multiple types of image recording media with different screen sizes
For available cameras, select the shooting screen size
And finder for image recording medium
A warning is issued by the display device regarding the suitability of the combination of camera elements such as, so that a remarkable effect that photographing due to erroneous combination can be prevented can be obtained.

[Brief description of the drawings]

FIG. 1 is a configuration block diagram of an electric circuit in a camera capable of switching a shooting screen size according to the present invention.

FIG. 2 is a perspective view of a camera capable of switching a photographing screen size according to an embodiment of the present invention, in which an interchangeable lens, a screen unit, and a finder unit are detached from a camera body.

FIG. 3 is a plan view showing a state where the screen unit is mounted on a camera body.

FIG. 4 is a rear view showing the camera according to the embodiment with a rear lid removed.

FIG. 5 is a front view showing a photographing screen mask switching mechanism in the camera of the embodiment.

FIG. 6 is a perspective view showing a main part of a pulse generation mechanism for detecting a film feeding amount in the camera of the embodiment.

FIG. 7: Current JIS13 with perforation
The front view of the film cartridge which has a DX code and accommodates a 5 type roll film.

FIG. 8 shows the same 35 as the above JIS 135 type roll film.
The front view of the film cartridge which has a DX code and accommodates the roll film which does not have a perforation by mm width.

FIG. 9 is a table showing the relationship between the film form and the state of the electrode range when the electrode range L7 of the DX code is used as an identification code.

FIG. 10 is a flowchart showing an example of the operation of the film type identification means 112 in the camera of the embodiment.

FIG. 11 is a front view showing a shooting screen size of a perforated film.

FIG. 12 is a front view showing a shooting screen size of a film without perforation.

FIG. 13 is a side view showing a configuration of a screen unit for an A type film, showing a main part in a cross section.

FIG. 14 is a side view showing a configuration of a screen unit for a normal type film, showing a main part in cross section.

FIG. 15 is a plan view showing the switching state of the viewing frame liquid crystal plate in the screen unit of FIG. 13;

FIG. 16 is a side view showing a configuration of a finder unit exclusively for L mode using an A type film.

FIG. 17 is a front view showing a finder field of view in the finder unit of FIG. 16;

FIG. 18 shows display information 8 in the finder unit.
FIG. 2 is an enlarged view of a photographing mode and a display section 84 of a film to be used in FIG.

FIG. 19 is a side view showing a configuration of a finder unit dedicated to N mode using a normal type film.

FIG. 20 is a front view of a finder field of view showing a state when a finder of a finder unit dedicated to the N mode is viewed.

FIG. 21 is a flowchart showing an operation when the L mode is selected.

FIG. 22 is a flowchart showing an operation when the N mode is selected.

FIG. 23 is a table summarizing selected shooting modes and combinations of viewfinders, screens, and films.

[Explanation of symbols]

a, b... ...... Screen size DX1 to DX12... DX code reading contact (film discriminating means) 1... Camera body 3A, 3B... ... Interchangeable lenses 6A, 6B ... Screen unit 53 ... Film cartridge 53a ... DX code (film discriminating means) 84a to 84d Display section (warning means) 116 Switching means

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI G03B 17/20 G03B 17/20 G03C 3/00 571 G03C 3/00 571A 572 572A (58) Fields surveyed (Int. Cl. ⁷ G03B 13/12 G03B 17/00-17/28 G03C 3/00

Claims (5)

(57) [Claims] An image recording medium specific to an image recording medium to be used.
At least the first shooting screen size and the
The shooting screen size is smaller than the shooting screen size of 1.
In switchable camera and a second picture-format, and the screen size switching means for setting switching the shooting screen size according to the image recording medium to be used, relative to the set photographing screen size, removable plurality Warning means for issuing a warning when any one of the camera elements does not match , the warning by the warning means being viewed in the viewfinder.
A camera that can be detected. 2. A photographed image set in the viewfinder.
Viewing range that allows viewing range corresponding to surface size
2. The turtle according to claim 1, further comprising switching means.
La . 3. The image recording medium according to claim 1 , wherein
A wound film, which is warned by the warning means.
Is loaded, load the film.
2. The camera according to claim 1, wherein there is no camera . 4. An image recording medium specific to an image recording medium to be used.
At least the first screen size and the first
The second image having a shooting screen size smaller than the screen size
In a camera switchable to a screen size, a first viewfinder compatible with the first screen size is provided.
Knit and a second file that can correspond to the second screen size.
One of which can be selectively attached to the
A viewfinder unit mounting section and a filer mounted on the finder unit mounting section.
Which finder unit the finder unit is
Identifying means for identifying, and the first screen size being set by the identifying means
The second finder unit is attached
A warning means for issuing a warning when it is determined that the camera has been operated . 5. A warning issued by said warning means,
A display means in the finder for displaying in the finder, and a warning issued by the warning means on the front surface of the camera.
5. The camera according to claim 4, further comprising: a display unit for displaying the information .