JPH10186589A - Manufacture of film unit with lens and film unit with lens - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a film unit with lens where film is surely taken up at a specified position though the film is taken up in the state of attaching a rear cover after loading a cartridge and a spool to a unit main body. SOLUTION: This manufacturing method is provided with a process where the film F is taken up on the spool 3 by smaller force than the locking force of the film F to a winding shaft, the process where the increase of the take-up torque of a take-up motor 27 is detected at the time of finishing taking-up, the process where the rotation of the take-up motor 27 is stopped when the take-up torque of the take-up motor 27 is increased more than a specified value and the process where the film F taken up on the spool 3 is pulled out to the specified position by reversely rotating a feeding motor 21 and detecting the speed of revolution.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for manufacturing a film unit with a lens and a film unit with a lens.

[0002]

2. Description of the Related Art In a film unit with a lens, an unexposed film is previously loaded in a manufacturing process. That is, the film sent from the APS film cartridge, or 1
35 The film drawn from the film cartridge is shipped in a state in which all the films are wound on a spool. Then, the user performs a winding operation each time a photograph is taken, and the film is moved by one.
Each piece is taken up in a cartridge or a cartridge.

In the following description, the cartridge is mainly composed of an APS film, and the expression "patrone" is omitted.

Here, as a manufacturing process for winding the film sent from the cartridge onto a spool, there are a manufacturing process performed outside the unit main body having a photographing function and a manufacturing process performed inside the unit main body. In the manufacturing process performed outside the unit main body, a sufficient space for a jig and the like can be obtained, but the manufacturing process becomes large, and a large space is required at the manufacturing site. In the manufacturing process performed in the unit main body, the space for the jig and the like is limited, but the manufacturing process is small and the space is saved.

As a method of winding a film in a unit body, Japanese Patent Application Laid-Open No. 5-134361 is disclosed. In this publication, a patrone and a spool (spool) are loaded into a unit body, a film is sent out from the patrone, the spool is rotated faster than the feeding speed of the film, and the leading end of the film is caught by catching means of the spool. The production method of winding a film around a winding shaft in a roll shape is described.

Conventionally, when winding a film from a cartridge onto a spool, a predetermined amount of film has been wound by detecting the number of rotations of a winding motor and detecting the position of perforation by a sensor. Note that winding a predetermined amount of film refers to a state where the user winds up one frame first and the first frame to be exposed can be moved to the position of the photographing frame.

[0007] A corner formed by a surface substantially parallel to the film to be fed, which is located between a cartridge chamber in which a cartridge is loaded and an image frame forming a photographing screen, and an inner wall of the cartridge chamber substantially orthogonal to the film. The inventor has found that the shape of the portion has a great influence on the film delivery. That is, as shown in FIG. 6A and FIG.
Is formed in an arc shape or a right angle, since the film F in the cartridge C is curled, the leading end of the film F sent out from the cartridge C abuts on the corner 1f, and the film cannot be fed smoothly.

Further, the film unit with the lens holds the film at a predetermined position in the optical axis direction by the rail surface of the unit body and the pressure plate surface of the rear cover at the time of photographing, and focuses the light beam from the photographing lens at an appropriate focus. Image. If the pressure plate surface of the cover is thereafter formed to be a simple flat surface or a curved surface, there arises a problem that foreign matter such as dust enters between the rail surface and the pressure plate surface, thereby causing abrasion on the film surface. For this reason, a film unit with a lens provided with a plurality of ribs or a plurality of projections in a film feeding direction is known. The area ratio of the plurality of projections to the pressure plate surface is as small as about 30% or less.

[0009]

As described above, it is preferable that the process of winding the film sent from the cartridge into the spool is performed in the unit body because the space for the manufacturing site can be saved. After the spool is loaded into the unit main body, if the rear cover is attached and light-tightened, the film can be wound in a bright room.

However, if the film is wound up with the rear cover attached, it is impossible to detect the position of the perforation with a sensor. Therefore, only the rotation speed of the winding motor is detected. When the motor slips or the like occurs, a failure occurs due to an excessively long or short winding amount.

In view of the above problems, the present invention proposes a method of manufacturing a film unit with a lens which can take up a film at a predetermined position with a rear cover attached after a cartridge, a film and a spool are loaded in a unit body. Is the first task.

Further, as described above, since the shape of the corner of the inner wall of the cartridge chamber, which is substantially perpendicular to the film to be fed, has a great influence on the film feeding, a film unit with a lens in which the shape of the corner is improved is proposed. Is the second task.

Further, even when a plurality of ribs are provided in the film feeding direction as in the prior art described above, the invading dust first adheres to the side surfaces of the ribs, and eventually moves to the apex of the ribs to scratch the film. May occur. On the other hand, even when a plurality of protrusions are provided on the pressure plate surface, since the area ratio of the plurality of protrusions to the pressure plate surface is small, the contact pressure on the film increases, and the pressure fog tends to occur on the film. is there.

In view of the above problems, it is a third object of the present invention to provide a lens-equipped film unit having a pressure plate surface which does not cause abrasion even when foreign matter such as dust enters and does not cause pressure fog. I do.

[0015]

A first object of the present invention is to provide an unexposed film in which one end is locked to a winding shaft in a cartridge, and the film wound around the winding shaft is fed out of the cartridge by a feeding motor. In a method of manufacturing a film unit with a lens which is wound by a winding motor on a winding member positioned beyond an image frame forming a shooting screen, the cartridge and the winding member are loaded into a unit main body having a shooting function. And a step of covering at least the cartridge, the film, and the winding member with a rear cover, and winding the film around the winding member with a force smaller than a locking force of the film to the winding shaft. Taking, and detecting a rise in the winding torque of the winding motor at the end of the winding, When the winding torque of the winding motor rises above a predetermined value, the step of stopping the rotation of the winding motor and the reverse rotation of the delivery motor and detecting the number of rotations, thereby winding the winding member. A step of drawing out the taken film to a predetermined position.

The second object is to provide a cartridge chamber for loading a cartridge containing an unexposed film into a unit body having a photographing function, an image frame for forming a photographing screen, and a film frame fed from the cartridge. In a film unit with a lens, in which a film roll chamber to be wound is arranged in order, a surface substantially parallel to a film to be fed and located between the cartridge chamber and the image frame, and a cartridge chamber substantially orthogonal to the film. The problem is solved by a film unit with a lens, wherein a corner formed by an inner wall is chamfered to a plane.

A third object of the present invention is to provide a film unit with a lens for holding a film at a predetermined position in an optical axis direction by a rail surface of a unit body having a photographing function at the time of photographing and a pressure plate surface provided on a rear cover. A plurality of recesses are provided on at least a portion of the pressure plate surface where the photographing screen of the film abuts, an area ratio of the plurality of recesses to the pressure plate surface is 50% or less, and a surface excluding the recess is formed as a curved surface. It is solved by a film unit with a lens characterized by the following.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First, an embodiment of a method for loading a film into a film unit with a lens for solving the first problem will be described in detail with reference to FIGS.

FIG. 1 is a perspective view showing a state before the cartridge and the spool are loaded into the unit main body. The process of loading the cartridge and the spool into the unit main body will be described with reference to FIG.

In FIG. 1, 1 is a unit body,
Although various photographing mechanisms are mounted, descriptions of mechanisms unrelated to the present invention are omitted. Reference numeral 2 denotes a front cover that covers the front surface of the unit body. Reference numeral C denotes an APS film cartridge, which contains all unexposed films including the leading end. Reference numeral 3 denotes a spool as a winding member, which winds the film around a side wall 3b between the flanges 3a. As will be described later in detail, an intake hole 3c for attaching a film to the side wall 3b is formed, and a hollow hole 3d is provided in the axial direction.

As described above, in the first step, the unit main body 1 with the front cover 2 attached, the cartridge C, and the spool 3 are prepared, the cartridge C is loaded into the cartridge chamber 1a of the unit main body 1, and the spool 3 is mounted in the unit. The film is loaded into the film roll chamber 1b of the main body 1.

The cartridge C is placed in the cartridge chamber 1
a, the film winding shaft C1 on the surface hidden in the axial direction of the cartridge C is engaged with the winding shaft 12 directly connected to the winding knob 11, and the light shielding cover for the surface on the hidden surface is similarly mounted. The shaft C2 is engaged with the light-shielding cover opening / closing shaft 13. As is well known, the APS film cartridge has a built-in light-shielding cover at the film entrance and exit, and the film entrance is normally closed by the light-shielding lid to prevent exposure of the film inside. The light-shielding cover shaft C2 is formed integrally with the light-shielding cover.

The spool 3 has an intake hole 3c in the side wall 3b.
Is placed directly above.

As described above, the cartridge C and the spool 3
After the unit body 1 has been loaded,
And light shielding the film.

Next, in the step of feeding the film from the cartridge C, it is necessary to open the light shielding cover of the cartridge C and the winding shaft 12 must be rotatable at least in the film feeding direction. These working steps will be described with reference to FIG. 2, which is a perspective view of one embodiment of a winding mechanism including a shutter charge.

In the figure, the hoisting knob 11 is formed integrally with the hoisting shaft 12, and the hoisting knob 11 is prevented from rotating in the clockwise direction, which is the direction opposite to the hoisting direction, by a reverse rotation preventing claw 14. Accordingly, the tip of the reverse rotation preventing claw 14 is pushed clockwise by the rod-shaped jig to release the engagement between the reverse rotation preventing claw 14 and the winding knob 11. Further, the light-shielding cover opening / closing shaft 13 protrudes upward from the cartridge chamber 1a through the unit main body 1. When the light-shielding cover opening / closing shaft 13 is rotated clockwise by a jig, the light-shielding cover shaft C2 of the cartridge C is also clocked. The light-shielding lid inside is opened.

A jig for operating the reverse rotation preventing claw 14 and a jig for rotating the light shielding cover opening / closing shaft 13 are inserted through holes (not shown) formed in the front cover 2.
These holes are finally covered with a paper cover or the like, and do not appear in appearance.

Further, an image frame 1c for forming a photographing screen is provided between the cartridge chamber 1a and the film roll chamber 1b in the unit body 1, and a perforation Fa of the film F is provided near the image frame 1c. An engaging sprocket 15 is provided. The sprocket 15 rotates with the feeding of one frame of the film F, performs shutter charging and indexer feeding, and also controls the rotation of the winding knob by an interlocking mechanism. Therefore, the film F meshes with the sprocket 15, and further the film roll chamber 1b
It is desirable that the sprocket 15 be rotatable at least in the feeding direction of the film F in order to feed the spool F to the spool 3 without resistance.

FIG. 3 is a longitudinal sectional view of a film unit with a lens. 2 and 3, the sprocket 15
Is fitted to a shaft 16a below the charge cam 16 for performing shutter charge, and integrally rotates. The shaft 16b above the charge cam 16 has a through hole 2 at the front end of the front cover 2.
a. Therefore, if a jig is inserted through the through hole 4a formed in the rear cover 4 and is moved upward while sandwiching the shaft 16b above the charge cam 16, the lower shaft 16
The engagement between a and the sprocket 15 is released, and the sprocket 15 becomes rotatable.

The sprocket 15 of this embodiment rotates one-third by feeding one frame of the film F.
If the cross-sectional shape of 6a is triangular and the sprocket 15 is fitted with a triangular hole, the phase of the cam does not shift due to attachment and detachment.

The through-hole 2a of the front cover 2 and the through-hole 4a of the rear cover 4 are finally covered with a paper cover or the like, and do not appear in appearance.

As described above, after the step of opening the light shielding cover and making the winding knob 11 and the sprocket 15 rotatable,
The film F is sent out from the cartridge C and the spool 3
The following steps will be described with reference to FIG. FIG. 4 is a perspective view of a state in which the film is sent out and the film is wound up, but the rear cover 4 is omitted for the sake of explanation.

In FIG. 4, reference numeral 21 denotes a feed motor, which is a servo motor for feeding a film, and rotates a film feed shaft 23 via a clutch 22. When feeding out the film F from the cartridge C, the film feed shaft 23 is engaged with the film winding shaft C1 of the cartridge C, and the film winding shaft C1 is rotated counterclockwise.

The rotation of the film feed motor 21 may be transmitted to the winding knob 11 and the film F may be fed from the cartridge C by rotating the winding knob 11 in the reverse direction.

Here, the leading end of the film F is
Before being sent to the position of the intake hole 3c above the
The distal end of the vacuum head 25 connected to the vacuum pump 24 is in close contact with the hollow hole 3d of the spool 3. The operation in this state will be described with reference to the sectional view of FIG.

4 and 5, the vacuum head 25 is brought into close contact with the hollow hole 3d of the spool 3. Then, the air is suctioned by the vacuum pump 24. Then, the air is suctioned from the suction hole 3c through the vacuum head 25 and the hollow hole 3d, and the leading end of the film F is attracted to the side wall 3b of the spool 3. In addition, 26
Is an O-ring, which prevents unnecessary intake from being performed through a gap between the vacuum head 25 and the hollow hole 3d.

As described above, the film F is sent out from the cartridge C while the air is sucked from the hollow hole 3d of the spool 3 using the vacuum pump 24. When the leading end of the film F is fed out to the position of the intake hole 3c of the spool 3, the intake hole 3c is closed by the film F. Therefore, a pressure sensor (not shown) attached to the vacuum pump 24 This state can be detected, and as a result, the rotation of the delivery motor 21 is stopped. In this case, the film feed shaft 23 may be idled via the clutch 22 while the film feed shaft 23 is kept engaged with the film winding shaft C1 of the cartridge C, or the feed motor 21 is retracted in the axial direction. Then, the engagement between the film feed shaft 23 and the film winding shaft C1 may be released.

Next, the take-up motor 27 composed of a servomotor is driven in a state where the leading end of the film F is attracted to the side wall 3b of the spool 3. Then, the winding motor 2
The first gear 28 connected to the shaft 7 rotates clockwise, and the second gear 29 meshing with the first gear 28 rotates counterclockwise. Since the second gear 29 is formed integrally with the vacuum head 25, the vacuum head 25 also rotates counterclockwise, but the projection 25a provided at the tip of the vacuum head 25 has a notch 3e provided on the spool 3. , The spool 3 is rotated counterclockwise while the film F is being sucked. After the film F has been wound around the spool 3 several times, the suction operation of the vacuum pump 24 is stopped.

Since the notch 3e provided in the spool 3 is provided in the same direction as the intake hole 3c in the radiation direction, the position of the intake hole 3c can be determined even when the rear cover 4 is mounted.

Since one end of the film F on the side of the cartridge C is inserted into or adhered to a film winding shaft in the cartridge C, the film F is wound around the spool 3 with a smaller force than the film engaging force. .

Thereafter, when the film F is wound up as much as possible, the film F is in a state where it can no longer be wound up and stretches. As a result, the rotation of the winding motor 27 stops, and the winding torque sharply increases. By detecting an increase in the winding torque of the winding motor 27, it is known that the film F has been wound to the final end, so that the rotation of the winding motor 27 is stopped.

Since the pull-out load of the film F varies depending on the film, a predetermined winding torque may be set, and the winding motor 27 may be stopped only when the predetermined torque is exceeded.

Subsequently, the film F is wound into the cartridge C by rotating the feed motor 21 in the opposite direction to that described above, and the first frame to be photographed is positioned one frame closer to the spool 3 than the image frame 1c. Then, the delivery motor 21 is stopped. In this way, the film winding step ends.

Further, since two flanges 3a are provided on the side wall 3b of the spool 3, there is no possibility that the film F is displaced in the axial direction to cause so-called bamboo winding.

It should be noted that a double-sided tape or the like may be provided on a part or the entire circumference of the side wall 3b of the spool 3 without providing the intake hole 3c. In this case, the suction by the vacuum pump 24 is of course unnecessary.

Next, an embodiment of a film unit with a lens for solving the second problem will be described with reference to FIGS.

In this embodiment, the unit body 1
Corner 1f formed by a surface 1d substantially parallel to the film F to be fed and located between the cartridge chamber 1a and the image frame 1c, and an inner wall 1e of the cartridge chamber substantially orthogonal to the film F.
Is formed in a flat chamfer. Therefore, even if the film F sent out from the cartridge C is curled, the leading end of the film F slides on the corner 1f chamfered to a flat surface and can be sent out smoothly.

Next, an embodiment of a film unit with a lens for solving the third problem will be described with reference to FIGS.

As shown in FIG. 3, the film F is held at a predetermined position in the optical axis direction by the rail surface 1g of the unit body 1 and the pressure plate surface 4b provided on the rear cover 4. 8A is a view of the rear cover 4 as viewed from the pressure plate surface 4b side, and FIG. 8B is an enlarged view of a portion A in FIG.
8C is a cross-sectional view taken along the line BB of FIG. 8B, and FIG.
It is CC sectional drawing of (B). As shown in FIG. 8, a plurality of recesses 4c are provided on the pressure plate surface 4b,
The surface 4d excluding the recess 4c is formed as a curved surface.

The area ratio of the recess 4c to the pressure plate surface 4b is at least 50% or less.

Therefore, the film F is in contact with the curved surface 4d, so that it is hardly abraded. Further, since the contact pressure with the film is small, pressure fogging does not occur in the film.

The concave portion 4c is a plurality of linear long grooves intersecting with each other, but may be curved long grooves.

In the pressing plate surface 4b, the portion where the concave portion 4c and the curved surface 4d are provided may be at least a portion where the photographing screen of the film F is in contact, but may be wider.

In the above embodiment, the film F is wound around the single spool 3.
The film F may be wound around a take-up shaft attached to the end of No. 5, and after winding to a predetermined length, the take-up shaft may be pulled out and shipped with a film roll without a core. Accordingly, the winding member in the claims includes both the spool 3 and the winding shaft.

Although the above embodiment has been described with reference to an APS film having no perforation at the leading end of the film, the present invention can also be applied to a 135 film having perforation at the leading end.

[0056]

According to the method for manufacturing a film unit with a lens according to any one of claims 1 to 6, even after a cartridge and a winding member are loaded in the unit body, the film can be wound with the rear cover attached. It can be reliably wound up at a predetermined position.

According to the film unit with the lens of the seventh aspect, the film F can be reliably sent out from the cartridge in the image frame direction.

According to the film unit with a lens according to the eighth and ninth aspects, no abrasion occurs even when foreign matter such as dust enters, and pressure fogging does not occur.

[Brief description of the drawings]

FIG. 1 is a perspective view of a state before a cartridge and a spool are loaded into a unit main body.

FIG. 2 is a perspective view of one embodiment of a winding mechanism including a shutter charge.

FIG. 3 is a longitudinal sectional view of a film unit with a lens.

FIG. 4 is a perspective view showing a state in which the film is sent out and the film is wound up.

FIG. 5 is a cross-sectional view in which the tip of the vacuum head is in close contact with a spool.

FIG. 6 is a sectional view of a cartridge and a cartridge chamber.

FIG. 7 is a sectional view of a cartridge and a cartridge chamber.

FIG. 8 is a view of a pressure plate surface of a rear cover.

[Explanation of symbols]

 C Cartridge F Film 1 Unit main body 1f Corner 2 Front cover 3 Spool 4 Rear cover 4b Pressure plate surface 21 Feeding motor 27 Winding motor

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI G03B 17/28 G03B 17/28 Z

Claims (9)

[Claims] An end of an unexposed film is locked to a winding shaft in a cartridge, and the film wound around the winding shaft is sent out from a cartridge by a motor, and is moved beyond an image frame for forming a photographing screen. A method of manufacturing a film unit with a lens that winds a winding member on a winding member positioned by a winding motor, comprising: loading the cartridge and the winding member in a unit main body having a photographing function; and at least the cartridge, the film, and A step of covering the winding member with a rear cover; a step of winding the film around the winding member with a force smaller than a locking force of the film to the winding shaft; Detecting a rise in the winding torque of the winding motor; and a winding torque of the winding motor. A step of stopping the rotation of the take-up motor when the rise is higher than a predetermined value, and by rotating the delivery motor in reverse and detecting the number of rotations, the film wound by the take-up member is moved to a predetermined position. A method of manufacturing a film unit with a lens. 2. The method according to claim 1, wherein the winding member is a single spool. 3. The cartridge according to claim 1, wherein the cartridge has a light-shielding lid for shielding the film, and the light-shielding lid is opened before the step of feeding the film from the cartridge. Manufacturing method of film unit with lens. 4. The film winding apparatus according to claim 1, wherein a winding knob for performing a winding operation is rotatable in a film feeding direction before the step of feeding the film from the cartridge. Of manufacturing a film unit with a lens. 5. The film according to claim 1, wherein a sprocket meshing with the perforation of the film is rotatable in a direction in which the film is fed before the step of feeding the film from the cartridge. 13. The method for producing a film unit with a lens according to the above item. 6. The motor according to claim 1, wherein the feed motor and the winding motor are servo motors.
6. The method for manufacturing a film unit with a lens according to any one of items 5 to 5. 7. A cartridge chamber for loading a cartridge containing an unexposed film in a unit main body having a photographing function, an image frame for forming a photographing screen, and a film roll chamber for winding the film sent from the cartridge. In the film unit with a lens in which are sequentially arranged, a corner formed by a surface substantially parallel to the film to be fed and located between the cartridge chamber and the image frame, and an inner wall of the cartridge chamber substantially orthogonal to the film. A film unit with a lens, characterized in that the part is chamfered in a plane. 8. A film unit with a lens for holding a film at a predetermined position in an optical axis direction by a rail surface of a unit body having a photographing function at the time of photographing and a pressure plate surface provided on a rear cover; A lens, wherein a plurality of concave portions are provided in a portion where a photographing screen of a film abuts, an area ratio of the plurality of concave portions to the pressure plate surface is 50% or less, and a surface excluding the concave portions is formed as a curved surface. With film unit. 9. The film unit with a lens according to claim 8, wherein the concave portion is a plurality of long grooves crossing each other.