JPH11316412A - Instant camera and instant photographic system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an instant camera which is so constituted that the spread of developing processing liquid can be controlled with stable effect. SOLUTION: This instant camera 2 is constituted, so that a film feeding-out port 45 where a photographed film unit 3 fed out from a film pack 4 is passed is formed at the upper surface of a film pack chamber 20 in which the pack 4 is loaded, Then, a spread control member 46 brought into slidable contact with the unit 3 to spread the developing processing liquid existing on a photosensitive layer is formed at one side constituting the port 45. Besides, since a pair of spread rollers 48 is fitted to a main body base part 21 provided with the chamber 20, the positional relation between a pair of spread rollers 48 and the control member 46 always becomes constant and a slidable contact state between the unit 3 and the control member 46 also becomes constant. Thus, the spread effect of the developing processing liquid is stabilized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an instant camera and an instant photographing system using the instant camera.

[0002]

2. Description of the Related Art There are various types of film units in which a pod portion containing a developing solution is provided at one edge of a large-sized exposure surface, and an instant camera using the film unit. The film unit is called a self-developing type, and is sold as a film pack in a state where a plurality of sheets are light-tightly housed in a box-shaped case. The instant camera is loaded together with the film pack.

In an instant camera, after subject light is exposed on an exposure surface of a film unit, the exposed film unit is discharged out of the camera. At this time, the pod portion is nipped and crushed by a pair of developing rollers, and development is performed by pouring a developing solution into a photosensitive layer provided inside the exposed surface.

There are various methods for improving the quality of printed photographs with the instant camera, but a simple and low-cost method is to uniformly spread a developing solution on the photosensitive layer. Tokuhei 3-72975
In No. 2, a spreading control surface that slides on a film unit is formed at a film outlet provided in a case. This spreading control surface spreads the developing solution flowing out of the pod portion on the photosensitive layer before the developing roller pair, and develops the developing solution on the widthwise edge of the film unit, which was difficult with only the developing roller pair. Assists spreading of liquid. According to the present invention, it is possible to improve the image quality of a printed photograph, optimize the amount of the developing solution included, and reduce the cost of the film unit.

[0005]

However, in order to keep the effect of the spread control of the developing solution by the spread control surface always constant, the sliding contact between the developing roller pair and the spread control surface (sliding contact). If the position, pressure, etc.) are not always constant, a stable effect cannot be obtained. Since the case of the film pack is composed of a plurality of parts using a thin plastic, it is often deformed by warping or distortion due to dimensional variations during molding or assembly, temperature, and the like. Therefore, the position of the spreading control surface and the developing roller is not always constant,
There is a problem that the spread control effect of the developing solution also varies.

Further, since the size of the conventional film unit is different from that of a print photograph of a general size or the like, it has not been possible to arrange the film unit using a common photo album or the like. For this reason, various small-sized film units are also sold. However, since the spreadability of the developing solution of the instant camera was inferior, the pod portion and the trap portion were enlarged to increase the amount of the developing solution contained therein in order to surely perform development in the film unit. . Therefore, in small size film units,
There has been a problem that the size of the positive image forming surface is further reduced, and even a group photograph or the like cannot identify each subject.

An object of the present invention is to solve the above problems and to provide an instant camera and an instant photographic system capable of controlling the spread of a developing solution with a stable effect.

[0008]

In order to solve the above-mentioned problems, an instant camera according to the present invention slides between a film outlet of a film pack and a developing roller pair by a film unit conveyed by the developing roller pair. In contact therewith, a spreading control member for controlling the distribution of the developing solution on the exposed surface is provided. As described above, when the spread control member is provided in the instant camera, the positional relationship between the unfolding roller pair and the spread control member is always constant, so that stable development control of the developing solution can be performed.

Further, by providing the spread control member in the film pack chamber and configuring the film delivery port of the film pack chamber, the instant camera can be adopted at low cost without increasing the size. Furthermore,
The spread control member is configured to be in sliding contact with the film unit from the back side where the exposure surface is not provided. Further, of the unfolding roller pair, the unfolding roller arranged on the side pressing the film unit toward the spreading control member is prevented from moving in the thickness direction of the film unit. Can be kept constant.

[0010] Further, the instant camera described above which is excellent in the spreading performance and the outer size is JISX6301 or I
By using a photographic film unit which is almost the same as the ID-1 type card described in SO 7810, it is possible to obtain a printed photograph having a small screen size and a large screen size.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 2, which is an external perspective view of an instant camera embodying the present invention, the instant camera 2 has a substantially rectangular shape when viewed from the front.
A film pack 4 (see FIG. 3) containing a plurality of film units 3 is loaded from the rear side. At the center of the front surface of the instant camera 2, a lens barrel 6 in which a photographing lens 5 is incorporated is provided. The instant camera 2 uses an auto-focusing mechanism of an infrared light active system. On the front surface of a lens barrel 6, in addition to the photographing lens 5, a light projecting window 7 and a light receiving window 8 constituting a distance measuring device.
And a photometric window 9 and a strobe light photometric window 10 that constitute a photometric device. Behind these windows,
A light emitting element and a light receiving element are incorporated.

A grip 12 is integrally formed on one side of the instant camera 2.
A power switch 13 and a shutter button 14 are provided in the upper part of FIG. The shutter button 14 can be pressed to two levels of depth. When the shutter button 14 is half-pressed, distance measurement and photometry are performed. When the shutter button 14 is pressed deeply, a shutter release is performed.

When the photographing range is confirmed by a finder 16 provided above the side of the instant camera 2 and the shutter button 14 is half-pressed, distance measurement and photometry are performed through the light emitting window 7, light receiving window 8, and light measuring window 9 described above. Is performed. When the shutter button 14 is depressed deeply, the autofocus device focuses on the basis of the distance measurement value, and the shutter device incorporated in the lens barrel 6 releases the appropriate aperture value and shutter speed based on the photometry value. Perform the operation. Also,
When the brightness of the subject is low, the strobe light is automatically emitted from the strobe light emitting unit 17 disposed above the lens barrel 6 toward the subject. After the photographing, the film unit 3 under development is discharged from the slit-shaped film discharge port 18 formed on the upper surface of the instant camera 2.

As shown in FIG. 3, which is a cross-sectional view of a main part of the instant camera 2, the instant camera 2 has a film pack chamber 20 in which a film pack 4 is loaded, formed on the back side, and various photographing function parts are mounted. It comprises a main body base 21 and a front cover 22 and a rear cover 23 that cover the front and back sides of the main body base 21. Rear cover 23
, A plate-shaped lid member 24 for opening and closing the film pack chamber 20 is attached via a hinge 25.

A photographing lens 5 is provided on the front side of the main body base 21.
A dark box 27 is provided to shield the photographing optical path between the camera and the film pack 4. An exposure opening 28 for exposing the film unit 3 in the film pack 4 is formed between the dark box 27 and the film pack chamber 20.

The film pack 4 is composed of a box-shaped plastic case 30 and a film unit 3 in which a plurality of sheets are stored in a stack. An opening 30 a that exposes the exposure surface 3 a of the stored film unit 3 is formed on the front surface of the case 30. A slit-shaped film outlet 32 for discharging the photographed film unit 3 out of the case is provided on the upper surface of the case 30. When the film pack 4 is not used, the film outlet 32 is closed by a flexible light-shielding seal 33 (see FIG. 1).

The film unit 3 is a transmission type mono-sheet type film unit. As shown in FIG.
The outer size (D100 × D101) is smaller than that of a conventional general size film unit. The film unit 3 includes an exposure surface 3a on which an image is exposed by the instant camera 2, and a positive image forming surface 3b provided on a surface opposite to the exposure surface 3a to form a positive image as shown in FIG. A photosensitive layer formed between the exposure surface 3a and the positive image forming surface 3b to form a latent image from subject light exposed on the exposure surface 3a; a pod portion 3c filled with a developing solution; And a trap portion 3d for absorbing the remaining developing solution that has flowed into the photosensitive layer from the portion 3c.

As shown in an exploded view in FIG. 6, the film unit 3 includes a mask sheet 55 having a screen opening 55a formed in the center, a photosensitive sheet 56 having a positive image forming surface 3b, and an exposure surface 3a. And a pair of rail members 58 that define a gap between the photosensitive sheet 56 and the cover sheet 57, a developer processing pod 59, and a trap member 60. The photosensitive layer is formed between the photosensitive sheet 56 and the cover sheet 57. When the latent image is developed by the developing solution, a positive image appears on the positive image forming surface 3b of the photosensitive sheet 56.

The photosensitive sheet 56, the rail member 58, and the cover sheet 57 are sequentially joined so as to be superimposed on the mask sheet 55, and the developer pod 59 and the trap member 60 are attached to both ends of the mask sheet 55. It is adhered to the outside of the provided folds 55b and 55c. Then, after the photosensitive sheet 56, the rail member 58, and the cover sheet 57 are joined on the mask sheet 55, the folds 55b, 55
The film unit 3 is formed by bending the front and rear ends of the mask sheet 55 from c and joining them to the cover sheet 55. An under member 62 for receiving the developing solution pod 59 and adjusting the height of the developing solution pod 59 and the photosensitive sheet 56 is connected to the pod 3c side of the photosensitive sheet 56.

In the film unit 3, since the periphery of the image displayed on the positive image forming surface 3b is hidden by the mask sheet 55, the area where the image is actually displayed in the film unit 3 is the size of the screen opening 55a. .

When the film pack 4 is not in use, the opening 30a is closed from the inside of the case 30 by a plate-shaped light-shielding cover 35 accommodated in the case 30 together with the plurality of film units 3. When the film pack 4 is loaded into the film pack chamber 20 of the instant camera 2 and the shutter release is performed for the first time, the light-shielding cover 35 opens the film discharge port 1 on the upper surface of the instant camera 2.
Emitted from 8. At this time, the light-shielding seal 33 that blocks the film outlet 32 is peeled off at the portion where the adhesive force is weak, and the film outlet 32 is opened.

Although not shown in detail, a notch into which a well-known claw member is inserted is provided below the opening 30a of the case 30. The claw member is driven in conjunction with the shutter release, moves upward from below, moves into the notch of the case 30, and contacts the lower end of the film unit 3 in the front row. Then, the film unit 3 is pushed upward in the case by directly moving upward, and the leading end of the film unit 3 is sent out from the film outlet 32 of the case 30.

On the inner wall of the back surface of the case 30, a ridge-shaped push-up protrusion 37 is formed at the center. The push-up protrusion 37 presses the film unit 3 forward through the light shielding sheets 38 and 39 disposed behind the film unit 3 to give the frontmost film unit 3 flatness. The push-up projection 3 is provided on the back of the case 30.
7, two holes 40 and 41 are formed. When the film pack 4 is loaded into the film pack chamber 20 of the instant camera 2 and the lid member 24 is closed, the push-up members 42 and 43 provided on the inner wall surface of the lid member 24 are formed in these holes 40 and 41. It is for entering.

The push-up members 42 and 43 are described in JP-A-7-2.
No. 44336, the pressing portions 42a, 43 which are movable in the thickness direction of the film unit 3.
a is pressed against the film unit 3 by the urging force of the spring to impart flatness to the frontmost film unit 3 in the case 30. The holes 40 and 41 into which the push-up members 42 and 43 enter are light-tightly closed by the two light shielding sheets 38 and 39 when the film pack 4 is not used.

As shown in FIG. 1, the film pack chamber 20
A slit-shaped film delivery port 45 for delivering the photographed film unit 3 from the film pack chamber 20 is formed on the upper surface of the film pack chamber 20. This film outlet 45 is
The film outlet 4 of the film pack 4 is disposed at a position shifted from the film outlet 32 to the front side of the instant camera 2, and one piece of the film outlet 45 slides on the positive image forming surface 3 b of the film unit 3, and The spreading control member 46 controls the spreading of the developing solution poured into the photosensitive layer from the portion 3c.

The leading end of the spread control member 46 is formed in an arc shape so as not to damage the positive image forming surface of the film unit 3. Further, in order to feed the film unit 3 to the film sending port 45 which is arranged at a position shifted to the front side of the instant camera 2 with respect to the film outlet 32 of the case 30, the leading end of the spreading control member 46 is provided with a film unit 3. Is formed toward the film outlet 45.

An unfolding roller pair 48 is disposed above the film outlet 45. This developing roller pair 48
The front end of the film unit 3 sent out from the film pack chamber 20 is nipped and transported toward the upper film discharge port 18. At this time, the developing solution pod 59 in the pod portion 3c is cleaved, and the developing solution is poured into the photosensitive layer and spread. The developing roller pair 48 includes a driving roller 49 that is rotated clockwise in the figure by a motor, and a driven roller 50 that comes into pressure contact with the driving roller 49 and rotates in a counterclockwise direction.

The driving roller 49 and the driven roller 50
Is to reduce the dimensional error of the diameter in the axial direction,
It is formed using a hard steel material. The driven roller 50 is movable in the thickness direction of the film unit 3 in order to spread the developing solution on the photosensitive layer with a uniform thickness.
9 is pressed. The reason why the drive roller 49 is not moved in the present embodiment is that the drive roller 49 is disposed on the side that presses the film unit 3 against the spread control member 46. In this manner, by fixing the position of the drive roller 49 that presses the film unit 3 against the spread control member 46, the film unit 3
State (sliding contact position, pressure, etc.) between the sheet and the spreading control member 46
Can be made constant, and the effect of the stable spreading control member 46 can be obtained. When the roller disposed on the side pressing the film unit 3 against the spread control member 46 is the driven roller 50, the driven roller 50 is fixed, and the driving roller 49 is movable in the thickness direction of the film unit 3. I do.

The developing roller pair 48 includes the driving roller 4.
The contact position between the roller 9 and the driven roller 50 is located at a position directly above the tip of the spreading control member 46. Thus, the unfolding roller pair 48, the spreading control member 46, and the edge of the film outlet 32 of the case 30 are attached to the film unit 3.
Contact, the film unit 3 is bent into a gentle S-shape. Therefore, the sliding contact force between the film unit 3 and the spreading control member 46 is increased, and the spreading of the developing solution by the spreading control member 46 is performed more effectively. Note that the contact position between the drive roller 49 and the driven roller 50 is not necessarily limited to a position directly above the leading end of the spread control member 46, but the film unit 3 is gently bent, and the back surface is controlled for spread. This is a position where the contact with the member 46 becomes easy. For example, 0.1 mm is desirable as a horizontal clearance from the film contact position (left end) of the drive roller 49 to the leading end of the spread control member 46.

Further, a film passage 53 for guiding the film unit 3 which has passed the developing roller pair 48 to the film discharge port 18 is inclined forward of the instant camera 2. As a result, the contact area between the pod portion 3c of the film unit 3 and the driving roller 49 increases, and the effect of spreading the developing solution by the driving roller 49 improves.

Next, the operation of the above embodiment will be described. When taking a picture with the instant camera 2 shown in FIG. 2, first, the power switch 13 is operated to turn on the power of the instant camera 2. After that, the photographing range is checked with the viewfinder 16 and the shutter button 14 is half-pressed, so that the light projecting window 7 and the light receiving window 8 provided on the front surface of the lens barrel 6 can be seen.
Distance measurement and photometry are performed through the photometry window 9. When the shutter button 14 is pressed deeply, focusing is performed based on the distance measurement value, and the shutter device incorporated in the lens barrel 6 performs a release operation based on the photometry value. When the brightness of the subject is low, the strobe light is automatically emitted from the strobe light emitting unit 17 disposed above the lens barrel 6 toward the subject.

The subject light transmitted through the photographing lens 5 passes through the dark box 27, the exposure opening 28, and the opening 30a, and is exposed on the exposure surface 3a of the film unit 3. A latent image is photochemically formed on a photosensitive layer formed between the cover sheet and the photosensitive sheet from subject light irradiated on the exposure surface. When the release operation of the shutter device is completed, the well-known claw member is moved upward from below by the motor and enters into the notch formed in the front surface of the case 30 so as to be continuous with the opening 30a. At this time, the film unit 3 comes into contact with the lower end of the film unit 3 in the front row and moves upward as it is, thereby pushing the film unit 3 upward in the case 30.

The film unit 3 sent out from the film outlet 32 in the case 30 is discharged from the case 30 and guided by a slope formed on the lower surface of the leading end of the spread control member 46 to feed the film in the film pack chamber 20. 45
Head for. The film unit 3 delivered from the film delivery port 45 is nipped by the rotating developing roller pair 48, and is conveyed toward the upper film discharge port 18.

During this transport, the developing solution pod 59 in the pod 3c of the film unit 3 is torn by the pressing of the developing roller pair 48. Cleavage of developing solution pod 59
The developing solution flowing out of the developing roller flows into the photosensitive layer between the photosensitive sheet 56 and the cover sheet 57 by the pressing of the developing roller pair 48, and the developing process is performed. The film unit 3 that has passed through the unfolding roller pair 48 becomes a film passage 53 inclined toward the front of the instant camera 2.
Sent to. As a result, the contact area between the pod portion 3c of the film unit 3 and the driving roller 49 is increased, and the effect of spreading the developing solution by the developing roller 48 is also improved.

The developing solution poured onto the photosensitive layer is spread by the developing roller pair 48 and, at the same time, is spread by the spreading control member 46 which slides on the positive image forming surface of the film unit 3.
Is spread over the photosensitive layer with a uniform thickness. The spread control member 46 is formed integrally with the main body base 21 of the instant camera 2 and
Since the drive roller 49 for pressing the roller against the spread control member 46 is fixed to the main body base 21, the sliding contact state between the film unit 3 and the spread control member 46 is always constant, and the spread effect of the developing solution is stabilized. Can be obtained. Also,
Since the spread control member 46 is provided integrally with the film pack chamber 20 and forms the film feed port 45, the instant camera 2 can be used without increasing the size or cost of the instant camera 2. it can.

The remaining developing solution after being spread on the photosensitive layer by the spreading control member 46 and the developing roller pair 48 is sent to the trap portion 3d below. The trap material 60 in the trap part 3d absorbs the fed processing solution and solidifies.

The film unit 3 that has passed through the film passage 53 is discharged out of the instant camera 2 through the film discharge port 18. Since the photosensitive layer of the film unit 3 has been developed by the developing solution developed by the spread control member 46 and the developing roller pair 48, a print image appears on the positive image forming surface 3b after a certain period of time. Since the developing solution is spread on the photosensitive layer with a uniform thickness by the developing roller pair 48 whose contact area with the pod portion 3c of the film unit 3 is increased and the spread control member 46, the print image of the film unit 3 is obtained. Improves image quality.

Further, by providing the spread control member 46 in the instant camera 2, the developing solution can be spread efficiently, so that the required amount of the developing solution and the amount of the excess developing solution are reduced. Can be reduced. Therefore, the size of the pod portion 3c and the trap portion 3d can be reduced, and the area of the exposure surface 3a and the positive image forming surface 3b can be increased accordingly. The effect of increasing the area between the exposure surface 3a and the positive image forming surface 3b is particularly effective for a small-sized film unit.

[0039]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The film unit 3 has an outer dimension D.
100 × D101 is JIS X6301 or ISO7
810, approximately equal to that of the ID-1 type card,
It is 54 mm × 85.6 mm, and the area ratio between the positive image forming surface and the margin portion formed by the developing solution pod and the trap portion is 1.4 or more.

The mask sheet 55 is a member constituting a screen frame, and is provided with an adhesive having a thickness of about 12 μm on one side of a base material on which a transparent polyethylene terephthalate (PET) having a thickness of 12 μm and a vapor-deposited PET having a thickness of 12 μm are laminated. A layer (EVA-SBS system), a white layer containing titanium oxide and silica having a thickness of about 8 μm and a gray logo print layer having a thickness of about 8 μm on the other surface, have a total thickness of 50 μm.

The rail member 58 functions as a spacer for controlling the developed thickness, and the photosensitive sheet 43 and the cover sheet 4
5 is also provided. This rail member 58 is
A light-shielding layer having a thickness of 10 μm was formed on one surface of a transparent PET having a thickness of 38 μm.
m, and an 8 μm thick adhesive (EVA-SB
S system), and an adhesive (EVA) having a thickness of 8 μm is applied to the other surface.
-SBS type), and the average thickness is 64 μm. In addition, the adhesive thickness or the adhesive prescription may be changed as necessary in order to secure the adhesive force on the photosensitive sheet 56 side, but when one of the thicknesses is increased, in order to keep the total thickness constant, The other thickness needs to be reduced accordingly.

The photosensitive sheet 56 has a 90 μm-thick PET support containing a trace amount of titanium oxide, on which an acetylcellulose-based back layer is coated on one side and an image receiving layer and a white reflective layer are formed on the other side. , A light-shielding layer, a red-sensitive emulsion layer, a green-sensitive emulsion layer, a blue-sensitive emulsion layer, a UV absorber layer, and a protective layer. A color mixing prevention layer is provided between the respective photosensitive emulsion layers, and the total thickness is about 115 μm.

The cover sheet 57 has a 70 μm-thick PET support containing a trace amount of a blue dye, on one surface of which an acetylcellulose-based filter dye layer is coated, and on the other surface, a neutralizing layer and a neutralizing layer. A timing layer and a temperature compensation layer are provided. The total thickness is about 80 μm.

As shown in FIG. 7, the developing solution pod 59
Is a packaging material in which an aluminum foil is bonded to a paper support and an EVA adhesive is applied. The external dimensions D35 and D36 are 48.6 mm and 12.5 mm, respectively. I do. D38 (7.5 mm) and D39 (0.5 mm) are provided at the center of the developing solution pod 59.
5mm), D40 (3.5mm), D41 (7.6m
m), D42 (8.55 mm), and D43 (1 mm) are provided with mid seals 64-66. Also,
As shown by hatching in the drawing, a weak seal 67 having a width of D37 (1.5 mm) and a weak bonding force is applied to the outlet from which the developing solution flows out.

When the weak seal 67 is broken and the developing solution flows out of the outlet portion, the mid seals 64 to 66 increase the amount of developing solution flowing out of both sides from the central portion to increase the screen. The developing solution is spread evenly over the whole. The under material 62 has a thickness of 100 μm.
Of transparent PET.

As shown in FIG. 5, the size of the screen opening 55a where the image on the side of the positive image forming surface 3b of the film unit 3 appears is D20 × D21. The pod portion 3c in which the developing solution pod 59 is stored is a writing portion 69 having a width D22 in which a comment or the like can be written. Further, a T frame 70 having a width D2 is formed on the positive image forming surface 3b side of the trap portion (T portion) 3d in which the trap material 60 is stored. Also,
The horizontal frame 71 behind the rail member 58 has a width D23.

In FIG. 4 showing the exposure surface 3a side of the film unit 3, a single air hole 73 is formed by leaving the central portion of the trap portion 3d unsealed. The air hole 73 is formed at a distance D25 (24.5 mm) from the side end of the film unit 3 and has a width D26.
(5 mm). The seal width D6 on the photosensitive sheet 56 side of the trap portion 3d is 0.8 mm, the seal width D27 on the side is 2.2 mm on both the right and left sides, but the seal width D29 on one rear end portion is 3 mm, and the claw member of the instant camera is used. The seal width D2 of the part 74 with which
8 is 4.0 mm in order to obtain sufficient strength. The width D30 of the rail member 58 is 2.2 mm. The fold width D24 of the pod 3c is 15.4 mm,
The side seal width D31 is 1.8 mm, and the photosensitive sheet 5
The seal width D32 on the sixth side is 0.8 mm.

Tables 1 to 4 show specific examples of the film unit having such a structure. The thickness of the trap portion (T portion) 3d, which is the thickest portion of the expanded film unit 3, is 0.9 mm.

[0049]

[Table 1]

The first embodiment deals with variations in the amount of surplus developer flowing into the trap portion 3d due to variations in the thickness of each member, variations in the rotation speed and rotation of the developing roller of the camera, and variations in the temperature during deployment. Therefore, sufficient capture space was secured.

The second embodiment corresponds to the surplus amount of developer flowing into the trap portion 3d when the above-mentioned variation relating to the development is optimally managed. The margin ratio is the largest. Although the developed thickness of the developing solution in Example 2 is 61 μm, if the developed thickness can be further reduced, the size of the developing solution pod 59 can be further reduced. Since the size can be further reduced, the screen / margin ratio can be further increased.

In the third embodiment, the longer side of the screen size is reduced by about 1.6 mm from that of the first embodiment.
Since the margin ratio was 1.50 and the screen area was 27.8 cm ² , the face of each person could be recognized sufficiently even when several persons were photographed.

In the fourth embodiment, the long side D21 of the screen size is further reduced by 1.8 mm from the third embodiment, and the screen / margin ratio is 1.42. This screen / margin ratio 1.42
Is applied to a group photo that shoots multiple people in a film unit with almost ID-1 card size.
It can be said that the size is almost the limit in screen observation.

In the first to fourth embodiments, the outer size is JIS.
Since it is almost the same as that of the ID-1 type card described in X6301 or ISO7810, a general card holder or the like can be used for a photo album, and can be appropriately stored in a wallet or a business card holder. Can be solved, which is a drawback of the instant film unit.

Further, while the screen / margin ratio of a conventionally sold film unit is 0.22 to 1.29, in the film unit of this embodiment, the effect of the spread control member causes the development processing solution to be used. Since the inclusion amount can be optimized, the screen / margin ratio is set to 1.40 or more. As a result, it is possible to obtain an image area having an outer size smaller than that of the conventional film unit, but which can be recognized enough to identify each subject even in a group photograph of several persons. In addition, since the trapping materials of Examples 1 to 4 are adhered to the mask sheet with an adhesive applied in a straight line that is continuous without gaps, the excess developing solution that has wrapped around the top surface of the trapping material is air. It is prevented from reaching the hole and flowing out.

In the above-described embodiment, the spread control member is formed on one piece constituting the film delivery port of the film pack chamber. However, the spread control member is provided separately for the part to which the unfolding roller pair is attached, such as the film pack chamber or the outside of the film pack chamber. It may be provided. Further, by changing the shape of the leading end of the spread control member in the width direction, the spread effect of the developing solution can be optimized.

Although the transmission type film unit has been described as an example of the film unit, the present invention can be applied to a reflection type film unit in which the exposure surface and the positive image forming surface are the same surface.

[0058]

As described above, the instant camera of the present invention has a structure in which the film exit is located between the film exit and the unfolding roller pair.
Since a spreading control member is provided to control the distribution of the developing solution in the photosensitive layer by slidingly contacting the film unit conveyed by the developing roller pair, the positional relationship between the developing roller pair and the spreading control member is always constant. Since the state of sliding contact between the spread control member and the film unit is also constant, the spread of the developing solution can be controlled stably.

Further, since the spread control member is provided in the film pack chamber or the film feed port of the film pack chamber is formed, the instant camera can be adopted at low cost without increasing the size.
Further, of the developing roller pair, the developing roller arranged on the side that presses the film unit toward the spreading control member,
Since the film unit is not moved in the thickness direction, the state of sliding contact between the spread control member and the film unit becomes constant, and more stable spread control of the developing solution can be performed.

Further, by providing the spread control member in the instant camera, the developing solution pod and the trap portion of the film unit used for the instant camera can be reduced, so that a large screen size can be obtained even with a small external size film unit. Obtainable.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a main part showing a configuration near a developing roller pair of an instant camera according to the present invention.

FIG. 2 is a perspective view showing the appearance of the instant camera.

FIG. 3 is a cross-sectional view of a main part on a side surface of the instant camera.

FIG. 4 is a front view showing an exposure surface side of the film unit.

FIG. 5 is a rear view showing a positive image forming surface side of the film unit.

FIG. 6 is an exploded perspective view showing the configuration of the film unit.

FIG. 7 is an explanatory diagram showing a sealing form of a developing solution pod.

[Explanation of symbols]

 2 Instant Camera 3 Film Unit 3a Exposure Surface 3b Positive Image Forming Surface 3c Pod 3d Trap 4 Film Pack 18 Film Outlet 20 Film Pack Chamber 21 Main Unit Base 32 Film Outlet 45 Film Outlet 46 Expansion Control Member 48 Roller Roller 55 Mask sheet 56 Photosensitive sheet 57 Cover sheet 58 Rail material 59 Developing solution pod 60 Trap material

Claims (6)

[Claims] 1. A self-developing type film unit having an exposure surface to which subject light is exposed, a photosensitive layer provided inside the exposure surface, and a developing solution pod containing a developing solution. And a film pack chamber in which a plurality of film units are accommodated and a film pack including a film outlet for discharging the film unit is loaded, and a film pack chamber facing the film outlet. Provided, a film delivery port for delivering the exposed film unit from the film pack chamber in the case, and a film unit delivered from the film delivery port, sandwiching and transporting the film unit while applying pressure, and tearing off the developing solution pod. An instant camera provided with a developing roller pair for spreading the developing solution on the photosensitive layer; And between the spreading roller, in sliding contact with the film unit carried by the spreading roller, instant camera, characterized in that a spreading control member for controlling the distribution of the development processing solution of the photosensitive layer. 2. The instant camera according to claim 1, wherein the spreading control member is provided in a film pack chamber. 3. The film spreading control member according to claim 1, wherein the spreading control member constitutes a film delivery port of a film pack chamber.
Or the instant camera according to 2. 4. The instant camera according to claim 1, wherein the spread control member slides on the film unit from the back side where no exposure surface is provided. 5. The unfolding roller of the unfolding roller pair, which is arranged on the side that presses the film unit toward the spreading control member, is not moved in the thickness direction of the film unit. An instant camera according to any one of claims 4 to 4. 6. The instant camera according to claim 1, wherein the outer size is JIS X6301.
Or an instant photo system using a photo film unit substantially equivalent to an ID-1 type card described in ISO 7810.