JPH05188504A - Screen frame adapter - Google Patents

Abstract

PURPOSE:To inexpensively obtain the screen frame adapter which is simple in construction and does not require high accuracy. CONSTITUTION:The screen frame adapter consists of an adapter body 41 to be fitted to the screen frame 1b on a camera body 1 side and wing parts 42 which are integrally fixed to the, body, overhang forward and backward in the progressing direction of a film and have elasticity. Inner rails 41a and outer rails 41b having prescribed steps are formed on the adapter body 41 so that the adapter body 41 is slightly floated by contact of the free ends of the respective wing parts 42 with the sleeve part 1d of the screen frame on the adapter body 1 side. If a user loads the film into the camera in the state and closes a rear cap, a film pressure plate presses the adapter body 41 against the elastic force of the wing parts 42 and the curling force of the film until the pressure plate comes into contact with the outer rails if on the camera body 1 side. The adapter body is thus held in the position and the exact film surface is assured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screen frame adapter to be mounted on a screen frame of a camera which can use films of different sizes together.

[0002]

2. Description of the Related Art For example, as a method for making 135 film usable in a medium format camera using 120, 220 film, a film back interchangeable camera has 120,
It is usual to provide a 135 film back in addition to the 220 film back, and in this case, it is not necessary to prepare a screen frame adapter on the camera body side. However, when trying to use 135 film in a medium format camera without film back exchange, a screen frame adapter for partitioning the screen of the 135 film must be attached to the screen frame on the camera body side.

Conventionally, in such a case, as shown in FIG. 13, a peripheral side portion 50a fitted to the screen frame 1b on the camera body 1 side, and an abutting surface 50b abutting on the inner rail 1e, 13
5 a film passage 50c through which the film passes, an adapter rail 50d that is flush with the inner rail 1e when mounted,
It was usual to mount the screen frame adapter 50 on the screen frame 1b of the camera body 1 and the screen frame adapter 50 including the locking plate 50e that can move outward and engage with the inner surface of the sleeve portion 1d of the screen frame 1b.

[0005]

However, such a conventional screen frame adapter has a complicated structure and requires high-precision processing, resulting in a high cost, and the attachment / detachment to / from the camera body 1 is troublesome. It was Also, the screen frame adapter 50
It is obvious that the height of the connecting portion 50f is higher than the surface of the outer rail 1f of the camera body 1 with which the film crimping plate 53 abuts in order to make the impact surface 50b and the adapter rail 50b on the same surface. The pressure-bonding plate 53 side requires a notch (or step drawing) 53a for escaping this portion.
When the 20,220 film was used, the flatness of the film surface might be unfavorably affected.

Furthermore, 120, 220 film and 135
There is no problem when the widths of the films are greatly different, such as a film. However, when the widths of the large and small films are only slightly different, the connection thickness of the connection portion 50f cannot be set sufficiently and the screen frame adapter There is also the problem of insufficient strength.

The present invention has been made in view of the above points, and an object thereof is to provide a screen frame adapter which has a simple structure and does not require high precision at low cost.

[0008]

In order to achieve the above-mentioned object, the present invention can use not only a common film but also a film having a narrower width than that of a common film. A frame adapter, the outer peripheral portion of which can be fitted to the camera-side screen frame, and an adapter main body having an inner rail and an outer rail having a predetermined amount of step difference on the film surface side, and a base portion of the adapter main body. A wing portion that is integrally fixed, and projects forward and backward in the film advancing direction so that its free ends contact the sleeves of the camera-side screen frame to lift the adapter body from the camera-side screen frame. In the state where the film is loaded and the back cover is closed, the film pressure plate on the back cover side is
There is provided a screen frame adapter capable of pressing the adapter body until the film crimping plate comes into contact with the outer rail of the camera side screen frame against the elastic force of the wings and the curl force of the film. ..

[0009]

The screen frame adapter according to the present invention is configured as described above, and after the screen frame adapter is mounted on the screen frame on the camera side, a narrow film is loaded and the back cover is closed. Push the adapter body until it contacts the outer rail surface of the camera side screen frame. At this time, a tunnel amount is formed between the inner rail surface of the adapter main body and the film pressing surface of the film pressure bonding plate, which is the same amount as when the regular film is used.

On the other hand, both sides of the narrow film are held by the inner rail surface, and most of the inner side of the narrow film is brought into close contact with the film pressing surface of the film crimping plate at a predetermined position by its own curling force. It is possible to secure the exact film surface exactly as in use.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be specifically described below with reference to the drawings. Prior to that, an outline of a portion relating to film winding of a medium format camera for carrying out the present invention will be described with reference to FIG. Briefly explained.

This medium-format camera is a lens shutter camera that does not exchange a film back and operates a range finder capable of shooting 12 or 24 frames of a 56 × 56 mm format using 120 or 220 film. 24
For example, 20 frames (in the case of a 36-sheet film) can be photographed on a x56 mm panoramic screen.

The 120 or 220 film is loaded into the film supply chamber 1a of the camera body 1 using the back cover 4,
The film is wound on an empty spool inserted into the film winding chamber 1c through the screen frame 1b. At that time, as the backing paper or film advances, the counter roller 2 rolls, the rotation angle is decelerated and transmitted to a known indexing plate, and the film is stopped and the counter is displayed.

In this embodiment, the counter roller 2 described above is used.
In order to utilize the 135 film even when using the 135 film, the first friction wheels 2a, 2a for the 120, 220 film integrally formed on the upper and lower sides of the counter roller 2 as well as the second friction wheel for the 135 film are pressed against each other. Friction car 2
b and 2b are integrally provided. This second friction wheel 2b,
It is desirable that the diameter of 2b is slightly smaller than that of the first friction wheels 2a, 2a so as not to contact the emulsion surface when the 120, 220 film is fed.

When switching between 120 and 220 films, a low step surface 3b is formed at both ends of the film pressure plate 3 with a step difference of about 120 film thickness with respect to the film pressing surface 3a. Then, the index 3c recessed on the surface is used to display the film type 4a (120), 4b on the back cover 4.
This is done by switching to any of (220).
As a result, the contact surface of the film crimping plate 3 abutting on the outer rail 1f of the camera body 1 is switched to change the film tunnel amount, and the film counter display on the camera body side is changed to 12 frames and 2 by a known switching mechanism.
Automatically switched to 4 pieces.

A spool bearing 5 is rotatably mounted on the film supply chamber 1a side so as to be slidable in the axial direction by a predetermined distance. A slit 5a is provided on the inner end surface of the spool bearing 5, and the opposite side projects from the camera body 1. It is applied to a rewinding knob 5b (see FIG. 7) which is a rewinding member having a slightly larger diameter. A spool bearing 6 is mounted on the film winding chamber 1c side so as to be slidable in the axial direction for a predetermined distance, and a winding release button 6b (see FIG. 6) described later is slidable in the axial direction in the center portion. It is provided in.

All of these spool bearings 5 and 6 are biased in a direction projecting from the camera body, and by operating the release levers 7 to project from the bottom surface of the camera body and resist the biasing force. It is locked in a position slightly retracted from the bottom surface of the camera body by being pushed in, so that it does not come into contact with the base on which the camera body is placed, the grasped hand, or the like.

4 and 5 show the film supply chamber 1 described above.
It is an example of a 135 film supply adapter mounted on a. This supply adapter 10 is almost L
The shaft coupling 12 is provided on the upper surface 11a of the holding frame 11 that is bent in a letter shape.
Is fixed so that the inner peripheral surface 12a can be loosely fitted to the outer peripheral portion of the spool bearing 8 fixedly provided on the upper portion of the film supply chamber 1a, and the lower shaft 12b has a short winding axis of the 135 film cartridge P. The hub P1 is pivotally supported.

A shaft 13 is installed between the lower bent portions 11b and 11b of the holding frame 11, and the shaft 13 is used to bend the bent portion 1 of the auxiliary frame 14.
The auxiliary frame 14 is pivotally attached to the holding frame 11 so as to be openable and closable by being inserted through 4a and 14a. Holding frame 11 and auxiliary frame 1 around shaft 13
4, the spring 15 is engaged with the auxiliary frame 14 to urge the auxiliary frame 14 in the clockwise direction in the figure, and the bent portion 14a contacts the holding frame 11 so that the auxiliary frame 14 is substantially perpendicular to the holding frame 11. In the normal state, it should have a generally U-shape.

Then, the shaft joint 16 is rotatably fitted in the auxiliary frame 14, and the cross-shaped slit 16a is formed at the upper end of the shaft joint 16 to form the hub P of the winding shaft of the cartridge P.
2 and the rib P3 formed on the inner surface of the rib 2, and a rib 16b is formed on the lower end side thereof so that the rib P3 can be engaged with the slit 5a of the spool bearing 5 on the camera body 1 side. A cylindrical portion 16c is provided on the outer side of the inner peripheral surface 16c 'so that the inner peripheral surface 16c' is axially supported by the outer peripheral surface of the spool bearing 5.

FIG. 6 is an exploded perspective view showing a rewinding adapter which is detachably attached to the rewinding knob 5b, and FIG. 7 is a sectional view showing a state where the rewinding adapter is mounted on the rewinding knob 5b.

This rewinding adapter 20 has a knurled non-slip surface on its outer periphery and movable pins 22, 2 on its inner surface.
2 has a large diameter outer cylinder 21 and a center hole 21a of the outer cylinder 21 that is relatively rotatably mounted in the flange portion 23a.
A regulating disc 23 that regulates a relative rotation angle with the outer cylinder 21 by abutting against 22 and fixed pins 24 and 24 planted in the regulating disc 23 are pivotally attached at one end to the vicinity of the free end. The arc-shaped tightening lever 2 in which the movable pins 22, 22 are loosely fitted in the dog-legged cam grooves 25a, 25a formed in
It consists of 5, 25.

The cam groove 25a of the tightening lever 25 comprises an inclined groove portion 25a 'which is inclined with respect to the circumferential direction and a circumferential circumferential groove portion 25a ", and the outer cylinder 21 is rotated in the X direction shown by the arrow in FIG. When the movable pin 22 is moved, the movable pin 22 is moved to the inclined groove portion 25.
By sliding in a ', the free end of the tightening lever 25 is driven inward, and the outer periphery of the rewinding knob 5b is clamped, and the movable pin 22 enters into the circumferential groove 25a ". The respective shapes are determined so that the rewind knob 5b can be firmly gripped.

Next, the structure of the 135 film winding adapter will be described with reference to FIGS. 8 and 9. Take-up adapter 3
0 is a drive hub 31 having a cross groove 31a that meshes with the take-up shaft 9 on the camera body side shown in FIG. 12, a pipe-shaped drive shaft 32 integrally fixed to the drive hub 31, and the drive hub 31. A take-up spool 33 which is loosely fitted to the outer peripheral portion of the shaft 32;
A rod 35 slidably mounted in the inner peripheral portion of the drive shaft 32 in the axial direction and biased downward in FIG. 9 by a spring 34, and a U-shaped roller mounted on the drive shaft 32 so as to be relatively rotatable. An instruction frame 36, a pressing roller 37 rotatably attached to a free end portion of the roller instruction frame 36, and a roller support frame 36.
A lower end portion is fixed to the upper end portion, and an upper end portion includes a pressing spring 38 slidably guided in the longitudinal direction.

A connecting pin 35a is planted on the rod 35, and the connecting pin 35a is inserted into the axially long hole 32a of the drive shaft 32 to engage with the groove 33a of the take-up spool 33. The drive shaft 32, the take-up spool 33, and the rod 35 rotate together by rotating in the same direction, and by moving the rod 35 upward against the spring 34 from this state, the connecting pin is moved as shown in FIG. 35a separates from the groove 33a so that the take-up spool 33 can freely rotate with respect to the drive shaft 32 and the rod 35.

Further, a clutch spring 39 is engaged around the shaft 36a of the roller support frame 36, and the free end portion thereof is shown in FIG.
, The rod 35 is held from both sides, and the eccentric groove 35 is formed on the outer peripheral surface near the lower end of the rod 35.
b is provided so that a part thereof is flush with the outer peripheral surface of the rod 35, and when the rod 35 is pushed up, at least one free end of the clutch spring 39 has an eccentric groove 35b as shown by a solid line in FIG. So that the rod 35 can be locked in the raised state. When the drive shaft 32 is rotated by the winding operation in this state, the clutch spring 39 disengages from the eccentric groove 35b, the rod 35 descends, the connecting pin 35a engages with the groove 33a, and the take-up spool 33 moves the drive shaft. 32.

When the winding adapter 30 having such a structure is mounted in the film winding chamber 1c,
The cross groove 31a of the winding shaft 31 is the winding shaft 9 on the camera body 1 side.
The lower end shaft portion 36b of the roller support frame 36 is rotatably loosely fitted to the spool bearing 6, and the lower end surface of the rod 35 is slidably provided on the spool bearing 6. Winding release button 6b urged downward by 6a
Engage the upper end of the.

Further, a screen frame adapter 40 for 135 film according to an embodiment of the present invention as shown in FIG. 1 is mounted on the screen frame 1b of the camera body 1 shown in FIG.

This screen frame adapter 40 has an adapter body 41 whose outer peripheral surface is fitted to the screen frame 1b of the camera body 1.
And a wing portion 42 which is integrally fixed to the wing portion and which has elasticity and projects forward and backward in the film advancing direction. The adapter body 41 is formed with a pair of inner rails 41a, 41a and outer rails 41b, 41b, and the wing portion 42 is bent slightly downward, and the free end portion of each of them is a screen frame on the camera body 1 side. When the adapter body 41 is slightly lifted by coming into contact with the sleeve portion 1d and the 135 film is loaded and the back cover 4 is closed, the film pressure plate 3 is urged by the urging force of the wing portion 42. In addition, the adapter body 41 can be pressed against the curl force of the 135 film until it comes into contact with the outer rail 1 on the camera body side, and the urging force of the wings 42 is stronger than the curl force of the 135 film. Set each bias.

In the state shown in FIG. 2 in which the step surface 3b of the film pressure plate 3 is in contact with the outer rail 1f of the camera body 1, the outer rail 41b of the adapter body 41 is pressed by the pressing surface 3a of the film pressure plate 3. The inner rail 41a is held at the localization value, and in this state, the inner rail 41a is on the camera body 1 side.
Set each dimension so that it is on the same plane as e.

By doing so, with the back cover 4 closed, the film pressing surface 3a and the camera body side are provided between the film pressing surface 3a of the film pressure plate 3 and the inner rail 41a of the adapter body 41. The tunnel amount for one film, which is the same as the tunnel amount for 220 films formed between the inner rail 1e, is secured.

As shown in FIG. 2, the 135 film F is held in close contact with the film pressing surface 3a of the film pressure plate 3 by the curl force of the film as shown in FIG. Even at that time, the film surface is held at a predetermined position, and the flatness is also kept good.

Next, the operation of the embodiment having the above structure will be described. First, the auxiliary frame 14 of the supply adapter 10
Is opened against the spring 15 and a 135 film patrone P accommodating an unexposed film is attached to the auxiliary frame 14
Close. Here, open the back cover 4 of the camera body 1,
The indicator 3c of the film pressure bonding plate 3 is displayed on the back cover 4 by the indicator 4b (22
0), the release levers 7 and 7 are operated to cause the spool bearings 5 and 6 to project outward by their own biasing force. Supply adapter 1 with the Patrone P attached in this state
The inner peripheral surface 12a of the shaft coupling 12 of 0 is fitted to the outer peripheral portion of the fixed spool bearing 8 on the camera body side to supply the adapter 1.
0 into the film supply chamber 1a, and then the spool bearing 5
The inner peripheral surface 16c 'of the cylinder 16c of the shaft coupling 16 by pushing
The shaft coupling 1 into the slit 5a of the spool bearing 5.
The rib 16b of No. 6 is inserted.

To mount the winding adapter 30 in the film winding chamber 1c, the cross groove 31a of the drive hub 31 is engaged with the rib 9a of the winding shaft 9 on the camera body side, and the winding adapter 30 is attached. After the insertion, the spool bearing 6 is pushed in to be loosely fitted to the inner peripheral surface 36b 'of the shaft portion 36b, and further, the screen frame adapter 40 is fitted to the screen frame 1b of the camera body 1 and the peripheral side surface of the screen frame main body 41 is fitted thereto. Put them together.

In this state, the roller support frame 36 of the winding adapter 30 is moved to the camera body 1 as shown by the phantom line in FIG.
Of the 135 film F pulled out from the cartridge P is inserted into the slit 33b of the take-up spool 33 and locked, and then the roller support frame 36 is pulled out. Then, the back cover 4 is closed by rotating it inward to the state shown by the solid line. As a result, the pressing spring 38 is pressed against the inner surface of the back cover 4, so that the pressing roller 37 moves to 135
The perforation band of the film F is pressed against the second friction wheel 2b of the counter roller 2 on the camera body side, and the screen frame adapter 40 is pressed against the film pressure plate 3 and held at a predetermined position.

Therefore, when the winding lever on the camera side is operated to rotate the winding shaft 9 in the winding direction, the drive hub 3
1, the drive shaft 32, and the winding spool 33 rotate together to wind up the film, and at the same time, the rotation of the winding shaft 9 causes a known clutch mechanism to rotate.

As the 135 film F advances, the counter roller 2 rotates due to friction with the 135 film F,
A known index plate rotates through a reduction gear train (not shown),
When the film is rotated by a rotation angle corresponding to the distance from the start mark of the 20,220 film to the first film, the winding is stopped and the film counter displays the first frame. In this way, in the case of 135 film, the winding length up to the first sheet is slightly longer than the usual length up to the first sheet,
There is no problem because it is within the allowable range when viewed from the full length of the film.

When the first film is taken, the film is unwound on the camera body side, and the film can be wound up.
It feeds almost the same amount as the film and stops. At this time, 135
The second friction wheel 2b in contact with the perforation band of the film is formed to have a slightly smaller diameter than the first friction wheel 2a in contact with both sides of the 120 and 220 films. The gap between the 135 film pieces is slightly smaller than that of the 120 and 220 film pieces, but the difference is very small.
Since there is a considerable margin in the interval between 0 film frames,
There is no risk of adjacent screens overlapping.

When a predetermined number of images (for example, 36 frames of film and 20 frames of the panoramic screen) have been photographed in this manner, the winding release button 6b provided on the spool bearing 6 on the film winding chamber 1c side is pushed to wind the film. Rod 35 of adapter 30
Drive upwards. In this state, as shown in FIGS. 10 and 11, at least one of the free ends of the clutch spring 39 falls into the eccentric groove 35b of the rod 35 to lock the rod 35 in the pushing position, and the connecting pin 35a causes the take-up spool 33a.
Is removed from the groove 33a of the drive shaft 32 and the take-up spool 33.
The connection with is released.

Therefore, in this state, the film supply chamber 1
When the rewind knob 5b on the a side is rotated in the rewind direction,
The shaft joint 16 of the cartridge holding frame 10 rotates in the same direction by the engagement of the rib 16b and the slit 5a, and the winding shaft of the cartridge P is rotationally driven via this shaft joint 16.
The 35 film is rewound into the cartridge P. Here, by opening the back cover 4, the film counter returns to the start position, and the cartridge P can be taken out together with the cartridge holding frame 10.

At this time, since the rewinding knob 5b is located at a position slightly retracted from the bottom surface of the camera body 1, the rewinding operability is not so good. To improve the operability, a slit or connecting hole is formed on the surface of the rewinding knob 5b to rewind it with a coin or a rewinding tool separately provided, or the crank is folded like a rewinding knob of a 35 mm camera. Although a method of providing it so that it can be folded is conceivable, if the rewinding adapter 20 as shown in FIG. 6 is used, it is convenient because the rewinding knob 5b does not require any additional processing.

That is, only when the 135 film is rewound, the rewinding adapter 20 is put on the rewinding knob 5b and the outer cylinder 21 is rotated in the rewinding direction.
3 is pressed by the rewinding knob 5b and remains stationary, and the outer cylinder 2
1 rotates, and the movable pin 22 moves the cam groove 2 of the tightening lever 25.
It moves in the inclined groove portion 25a 'of 5a. As a result, the tightening lever 25 rotates inward with the fixing pin 24 as a fulcrum, and the inner peripheral surface 25c holds the outer peripheral surface of the rewinding knob 5b. Further, the outer cylinder 21 is rotated to move the movable pin 2
As 2 engages with the circumferential groove portion 25a ″ of the cam groove 25a, the tightening lever 25 grips the rewinding knob 5b more firmly and the rewinding adapter 20 is integrally fixed to the rewinding knob 5b. As the movable pin 22 engages with the end of the circumferential groove 25a ″, the outer cylinder 21, the regulation disk 23, the tightening lever 25 and the rewinding knob 5b are integrally rotated to rotate the film in the rewinding direction. Rewind.

When this rewinding adapter is used, the rewinding knob that rotates when the 135 film is rewound can be prevented from protruding from the bottom surface of the camera body and does not hinder the rewinding of the film. , This rewinding adapter projects largely from the bottom surface of the camera body to facilitate the rewinding operation.

In addition to the rewinding adapter described above, one end side is fixed by using a tripod screw hole at the bottom of the camera body, and the other end side is stopped by a hanging bracket 1g (see FIG. 12) on the camera body side to prevent rotation. And a rewind adapter in which a large-diameter adapter knob equipped with a connecting pin that can fit into the rewind knob on the camera body side is rotatably mounted on this adapter board. It is also possible to drive the rewinding direction with the belly of the thumb. In this case, the rewinding adapter does not fall off and the operability is further improved.

In the above embodiment, the present invention is 12
Although the case of using 135 film in a medium format camera which commonly uses 0,220 film has been described, the present invention is not limited to this, and can be applied to any camera that can use a plurality of types of films having different film widths. it can.

[0046]

As described above, in the screen frame adapter according to the present invention, the adapter main body formed with the inner rail and the outer rail having a predetermined amount of steps is lifted from the camera side screen by the elastic force of the wings. By closing the back cover, the film pressure plate is pressed against the elastic force of the wings by the biasing force until it contacts the outer rail on the camera side. If the level difference between the outer rail and the outer rail is accurate, it is possible to always secure the best film surface without requiring high precision.

Further, unlike the conventional screen frame adapter, the film crimping plate does not need a relief for avoiding the connecting portion,
There is no risk of adversely affecting the film surface of the regular film, and since the screen frame adapter is constantly pressed by the film pressure plate, there is no need for floating prevention means, etc., and a connection part is required like the conventional screen frame adapter. I will not
Even in the case of films having slightly different film widths, it can be carried out without any trouble.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a 135 film screen frame adapter according to an embodiment of the present invention together with a film pressure plate and a screen frame on the camera body side.

FIG. 2 is a sectional view of an essential part showing the same mounting state.

FIG. 3 is a sectional view showing an outline of a loaded state of 135 films.

FIG. 4 shows the appearance of the 135 film supply adapter.
It is a perspective view shown with a film cartridge.

FIG. 5 is a side view of the same.

FIG. 6 is an exploded perspective view showing the structure of the rewinding adapter.

FIG. 7 is a sectional view showing a state in which the rewinding adapter is mounted on the rewinding knob.

FIG. 8 is a perspective view showing the outer appearance of a film winding shaft for a 135 film.

FIG. 9 is a sectional view of an essential part showing a state in which the film winding shaft is also mounted on the camera body.

FIG. 10 is a sectional view of an essential part showing the state when the film is rewound.

FIG. 11 is an explanatory view showing the action of the clutch spring of the same.

FIG. 12 is a perspective view showing a film loading section with the back cover opened of the medium format camera embodying the present invention.

FIG. 13 is an explanatory view showing a conventional screen frame adapter together with a film pressure plate and a screen frame on the camera body side.

[Explanation of symbols]

1 Camera Body 1a Film Supply Room 1b Screen Frame 1c Film Winding Room 2 Counter Roller 3 Film Press Plate 4 Back Lid 5, 6, 8
Spool bearing 9 Winding shaft 10 Supply adapter 11 Holding frame 12, 16
Shaft coupling 14 Auxiliary frame 20 Rewinding adapter 21 Outer cylinder 25 Tightening lever 30 Winding adapter 31 Drive hub 32 Drive shaft 33 Winding spool 35 Rod 36 Roller support frame 37 Pressing roller 38 Pressing spring 39 Clutch spring 40 Screen frame adapter 41 Adapter Body 42 Wing P 135 Film Patrone

Claims (1)

[Claims] 1. A screen frame adapter attachable to a camera-side screen frame, which is a non-replaceable film back, wherein not only a regular film but also a narrower film can be used, wherein the camera-side screen frame has an outer peripheral portion. An adapter body that is fittable and has an inner rail and an outer rail that have a predetermined amount of steps on the film surface side, and a base portion integrally fixed to the adapter body, and project forward and backward in the film advancing direction. Each free end is in contact with the sleeve of the camera side screen frame, and consists of elastic wings that raise the adapter body above the camera side screen frame. With the film loaded and the back cover closed, Due to the urging force of the film crimping plate on the back cover side, the adapter main body is pushed until the film crimping plate comes into contact with the outer rail of the camera side screen frame against the elasticity of the wing and the curl force of the film. Screen frame adapter, characterized in that it has adapted to press.