JP3818578B2 - FILM UNIT WITH LENS, ITS REUSE METHOD AND NON-REversible Claw - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lens-fitted photo film unit having a function of preventing refilling of an irregular film, and moreover, to efficiently reuse a film unit with a lens having such a function of preventing refilling. It relates to possible reuse methods.
[0002]
[Prior art]
Various types of lens-fitted photo film units that are pre-loaded with a photographic film and have a simple photographing mechanism are on the market. The used lens unit with a lens is normally collected by a manufacturer and reused or recycled for each component.
[0003]
However, among the lens-equipped film units currently on sale, there are some which are sold by irregularly reloading unused photographic film into a used film-equipped film unit. Such irregularly refilled products are often sold without proper inspection and repair, and have a problem of poor reliability. The problem that occurs in such a refill product damages the reliability of the lens-fitted photo film unit itself, and various measures have been made to prevent unauthorized reuse of the conventional lens-fitted photo film unit.
[0004]
In order to prevent unauthorized reuse of the lens-fitted photo film unit, there is a technique in which the rear cover that is removed from the base of the main body when the photographic film is reloaded is firmly fixed by ultrasonic welding. If the rear cover is forcibly removed, the welded part will be damaged and the light shielding performance will not be maintained. Further, in the film unit with a lens described in Japanese Patent Application Laid-Open No. 7-120883, when the film unit with a lens is disassembled, a structure for destroying a reverse rotation preventing claw that prohibits a reverse operation of the film winding knob is employed. For this reason, the engagement claw integrally formed with the rear cover is engaged with the reverse rotation prevention claw from the back side, and when the rear cover is forcibly removed while the reverse rotation prevention claw operates normally, the engagement claw The reverse rotation prevention claw is pulled to cause plastic deformation or breakage of the reverse rotation prevention claw.
[0005]
[Problems to be solved by the invention]
However, the above-described film unit with a lens has a drawback that it can be easily disassembled by cutting the ultrasonic welded portion with an ultrasonic cutter or the like. Moreover, the method of destroying the reverse rotation preventing nail using the nail has a case where the nail engagement is shallow and the effect is insufficient. In this case, it is possible to obtain a reliable refill prevention effect by tightening the dimensional control during production, but the disadvantage is that it cannot be used for low-cost lens-fitted film units due to increased production costs. there were.
[0006]
The present invention is for solving the above-mentioned problems, and provides a film unit with a lens that is effective at preventing refilling at a low cost, and also provides a method for recycling the film unit with a lens. Objective.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, a lens-fitted photo film unit of the present invention includes a main body base in which a film roll chamber and a cartridge chamber are formed, and a film passage that is assembled to the back surface of the main body base and extends from the film roll chamber to the cartridge chamber. And a rear cover that covers the light tightly and engages the front end side of the elastic reversing prevention claw integrally connected to the base of the main body with a locking portion formed along the rotation direction of the film winding knob. In the film unit with a lens that prohibits the reverse operation of the film winding knob, The welded portions projecting to the back side are formed at two spaced apart locations on the base side of the base, and the welded portions penetrate the back side of the back cover through individual openings formed in the back cover. The penetration portion of the welded portion is melted together with the partition piece that partitions the openings, and is welded and joined to the back side of the rear cover. It is characterized by that. As a result, when the rear cover is separated, the reverse rotation prevention claw is separated from the base of the main body and transferred to the rear cover, and the reverse rotation prevention function of the winding knob is surely impaired. Can no longer be used.
[0009]
More specifically, a support part in which the reverse rotation preventing claw is connected to the main body base at the base side is formed into a U-shaped cross section so as to protrude toward the rear cover, and this support part is used as a welding part. Good. In addition, it is a very effective means to adopt a structure in which a latching claw is provided integrally on the rear cover and the welded portion is held between the rear cover and the latching claw. In addition to the above-described reversal prevention claw portion, a light-blocking rib that abuts the inner surface of the rear cover and prevents the entry of external light is integrally formed on the back surface side of the main body base. It is more effective if a welded portion is provided and the second welded portion is inserted into an opening formed in the rear cover and welded to the rear cover in the same manner as the welded portion.
[0010]
In addition, after collecting the film unit with a lens having an irregular refill prevention function as described above, as a method of efficiently reusing it through the regular process, the reverse cover prevention claw is attached to the main body base together with the rear cover separation process. The reverse rotation prevention claw prepared as a new supplemental part instead of the separated reverse rotation prevention claw is preferably fixed to the main body base or the rear cover. If the reverse rotation prevention claw separated from the base of the main body is transferred to the rear cover, the separation mark of the reverse rotation prevention claw remaining on the main body base is shaped and a new reverse rotation prevention claw is fixed thereto, or the rear cover is fixed. If the part to be reused is also used, the anti-reverse claw transferred to the rear cover is removed. Thus, by replenishing a new reverse rotation prevention claw and reusing it, the reverse rotation prevention function of the winding knob can be reliably restored.
[0011]
The rear cover can also be used as a part to be reused, and the reverse rotation preventing claw that has been separated from the main body base by the separation of the rear cover and transferred to the rear cover can also be used. In this case, the anti-reverse claw is deformed when it is separated from the base of the main body, so that the deformation is corrected, or a backup auxiliary part is assembled to the rear cover so that the post-correction posture is maintained. It is preferable to do this.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
As shown in FIG. 1, the lens-fitted photo film unit to which the present invention is applied covers the main body base 2, the exposure unit 3 and the strobe unit 4 assembled on the front side of the main body base 2, and the front and rear of the main body base 2. It consists of a front cover 5 and a rear cover 6 assembled by engagement of hook claws. A film cartridge chamber 7 and a film roll chamber 8 are integrally formed on the main body base 2, and a film cartridge 9 and a roll-shaped film 10 are loaded into each. In addition, a well-known 135 film and cartridge are used for this lens-fitted film unit.
[0013]
The exposure unit 3 includes a photographing lens 12 and a viewfinder lens, a shutter mechanism including shutter blades, a shutter cocking mechanism including a sprocket that is driven to rotate in conjunction with film winding, a winding lock mechanism including a winding lever, and a film counter feed. A mechanism and the like are assembled and attached to the main body base 2 by engagement of a hook claw or a positioning pin.
[0014]
The strobe unit 4 is assembled with a light emitting unit 14 including a discharge tube, a reflector, and a protector on a printed circuit board 13 to which various electric parts constituting a strobe circuit are attached, and further, a sync switch that is turned on in synchronization with the opening of the shutter blades, A battery contact piece for holding the battery 15 is provided. The base of the switch contact piece 16 is assembled to the front surface of the film roll chamber 8 of the main body base 2, and when the power button 17 of the front cover 5 is pushed in, charging of the strobe starts. Similar to the exposure unit 3 described above, the strobe unit 4 is separated from the lens-fitted film unit that has been used and collected, and is reused through a function inspection and a repair process.
[0015]
A winding knob 18 is rotatably attached to the upper portion of the cartridge chamber 7. The fork protruding from the lower surface of the winding knob 18 is engaged with the spool of the cartridge 9, and when the winding knob 18 is turned counterclockwise in the drawing, the film 10 is wound up. Eight perforations (not shown) are provided on each side edge of the film 10, and the sprocket is driven to engage with the perforations so that shutter cocking is performed. When the one-frame feed of the film 10 is completed, the winding lever incorporated in the exposure unit 3 engages with the tooth row 18a formed on the outer periphery of the winding knob 18, and the turning operation of the winding knob 18 is prohibited.
[0016]
When the shutter button 19 provided integrally on the upper surface of the front cover 5 is pressed, the shutter mechanism incorporated in the exposure unit 3 is operated, and the shutter blades are opened and closed to perform one shooting. Simultaneously with the completion of photographing, the winding lever moves to the release position and the turning operation of the winding knob 18 is allowed, so that the film winding operation and the photographing operation can be repeated thereafter. As a result, the film 10 is sequentially pulled out from the film roll chamber 8 one frame at a time, and the exposed film 10 is caught in the cartridge 9.
[0017]
In order to prevent the winding knob 18 from being rotated in the direction opposite to the film winding direction, a reverse rotation preventing claw 22 is integrally connected to the main body base 2. As shown in FIG. 2, the base of the reverse rotation prevention claw 22 is integrated with the main body base 2, and the tip side is elastically engaged with the tooth row 18 a of the winding knob 18 from the back side. The base side of the reverse rotation preventing claw 22 provided integrally with the main body base 2 represents the fulcrum side when the reverse rotation preventing claw 22 is elastically deformed, and is not necessarily the shape end of the reverse rotation preventing claw 22. It does not have to be. Further, both the winding lever and the reverse rotation prevention claw 22 are engaged with the tooth row 18a. For example, another tooth row is formed along the rotation direction on the lower surface of the winding knob 18 to perform reverse rotation. The prevention claw 22 may be engaged.
[0018]
As shown in FIGS. 3 and 4, the reverse rotation prevention pawl 22 includes a support portion 23 that rises upward from the main body base portion 2, and an engagement piece 24 that extends from the support portion 23 toward the winding knob 18. Then, the leading edge 24a of the engagement piece 24 engages with the tooth row 18a of the winding knob 18 to prevent reverse rotation. A silencer 25 that is in contact with the lower surface of the winding knob 18 is integrally provided on the distal end side of the engagement piece 24. When the winding knob 18 is turned in the film winding direction, the edge 24a intermittently oscillates and oscillates little by little when the teeth 24a are intermittently moved over the tooth row 18a. By sliding in contact with each other, it is possible to suppress small vibrations of the engagement piece 24 and to suppress generation of sound.
[0019]
The upper portion of the support portion 23 is a weld portion 28 that protrudes toward the back side and has a U-shaped cross section. The welding portion 28 is composed of two welding pieces 28a and 28b spaced apart from each other. When the rear cover 6 is placed on the back surface of the main body base 2, the rear portion 6 opens from the openings 30a and 30b formed in the rear cover 6 as shown in FIG. It protrudes to the back side of the cover 6. At this time, the partition piece 31 partitioning the openings 30a and 30b enters between the welding pieces 28a and 28b. Further, the hook 32 formed integrally with the inner surface of the rear cover 6 is engaged with the front surface side of the welded portion 28, and the welded portion 28 is sandwiched between the inner surface of the rear cover 6. As a result, the reverse rotation preventing claw 22 including the welded portion 28 and the engaging piece 24 connected thereto is positioned on the rear cover 6, and in this state, the edge 24 a of the engaging piece 24 is correctly engaged with the tooth row 18 a of the winding knob 18. To do.
[0020]
As shown in FIG. 2, light shielding ribs are provided at appropriate positions on the back side of the main body base 2, and engage with grooves formed at corresponding positions on the inner surface side of the rear cover 6. The outside light is prevented from entering through the mating surface of the rear cover 6 and the rear cover 6. Some of the light shielding ribs 33 and 34 are integrally formed with welding pieces 33 a and 34 a extending toward the rear cover 6. These welding pieces 33a and 34a pass through the openings 35 and 36 provided at the corresponding portions of the rear cover 6 when the rear cover 6 is covered so as to cover the rear surface of the main body base 2, and to the rear surface side of the rear cover 6. To penetrate.
[0021]
As described above, the welding pieces 28 a, 28 b, 33 a, and 34 a that have reached the back side of the rear cover 6 through the respective openings are used for welding connection with the rear cover 6. As shown in FIG. 5, the welding head 40 is pressed against the welding pieces 28 a and 28 b that penetrate the openings 30 a and 30 b and the stepped portion 28 c. The welding head 40 is for energizing the nichrome wire to instantaneously heat and pressure-weld the plastic, thereby performing impulse welding. It is also possible to perform welding using a high-frequency welder that performs welding by applying a high-frequency electric field to plastic to generate heat.
[0022]
When the welding head 40 is pressed against the welding pieces 28a, 28b and the stepped portion 28c, the welding portion 28 is pushed forward. However, since the hook 32 of the rear cover 6 prevents the welding portion 28 from moving, the reverse rotation is prevented. The claw 22 hardly moves from the assembled position. Therefore, the engagement relationship between the edge 24a of the engagement piece 24 and the tooth row 18a of the winding knob 18 will not be out of order. When impulse welding is performed by the welding head 40, the partition pieces 31 between the welding pieces 28a and 28b are melted together with the melting of the welding pieces 28a and 28b and the stepped portion 28c.
[0023]
As shown in FIG. 6, these are mixed and melted and solidified, whereby the welded portion 28 of the reverse rotation preventing claw 22 is firmly fixed to the rear cover 6. Moreover, since the recessed part 30c is provided in the back side of the rear cover 6 so that the circumference | surroundings of opening 30a, 30b may be surrounded, as shown in FIG. 6, the welding part 42 is settled in this recessed part 30c, and the back side It does not protrude greatly.
[0024]
As shown in FIG. 7, the welding piece 34 a protruding from the light shielding rib 34 also protrudes to the back side through the opening 36 of the rear cover 6, and is attached to the rear cover 6 in the same procedure by the welding head 43. Welded and joined. Since the rear cover 6 is also provided with a welding piece 36a so as to surround the opening 36, the welding piece 34a and the welding piece 36 are mixed and melted, and these are solidified to solidify the main body base 2 and the rear cover 6. Are firmly integrated. The welding piece 33a provided on the light shielding rib 33 is also welded to the rear cover 6 in the same manner. Further, in addition to the welding connection by the impulse welding, the main body base 2 and the rear cover 6 are mechanically connected by hook claws provided in the required part, and further, the required part of the fitting part between the light shielding rib and the groove. They are integrated by bonding by ultrasonic welding.
[0025]
When the rear cover 6 is coupled to the main body base 2 as described above, it becomes difficult to separate the rear cover 6 from the main body base 2 due to an irregular film refill. In particular, since the welding pieces projected to the back side of the rear cover 6 are mixed and welded together with a part of the rear cover 6, if the rear cover 6 is forcibly peeled off, It is unavoidable to break. Also, in order to avoid breakage, for example, when cutting and cutting the welded part using a machine tool such as an ultrasonic cutter or a milling machine, it only takes time to shield the part after refilling the film. In particular, the welded portion 28 integrated with the reverse rotation preventing claw 22 is accompanied by functional destruction as described below, and cannot be reused irregularly.
[0026]
First, when the rear cover 6 is forcibly peeled off after the mechanically engaged portion by the hook claw is removed or the ultrasonic welded portion is cut, the reverse rotation preventing claw 22 is attached to the rear cover 6 by the welded portion 28. Since the welding strength is larger than the strength of the support portion 23 of the reverse rotation prevention claw 22, the reverse rotation prevention claw 22 is separated from the main body base 2 while being plastically deformed, and transferred to the rear cover 6. When the reverse rotation preventing claw 22 is plastically deformed in this way, the elasticity required for the reverse rotation preventing claw 22 is lost, and an appropriate reverse rotation preventing effect can be obtained even if the reverse rotation preventing claw 22 is subsequently reused. Disappear. Further, if the welded portion 28 is removed by cutting with a machine tool such as a milling machine, the thickness of the support portion 23 having a U-shaped cross section is obtained particularly when the step portion 28c shown in FIG. Therefore, the strength of the base portion of the anti-reverse claw 22 is weakened, and at the same time, the appropriate elasticity required for the anti-reverse action is lost, and an appropriate anti-reverse effect cannot be obtained.
[0027]
As described above, it is difficult to separate the rear cover 6 itself from the main body base 2 by integrally welding and bonding the welded portion formed integrally with the reverse rotation preventing claw 22 to the rear cover 6, and When the rear cover 6 is separated, the original function of the reverse rotation preventing claw 22 is impaired. Therefore, even if the film is refilled irregularly, normal shooting operation cannot be performed, which is very effective in preventing such actions.
[0028]
Further, since the welding pieces 33a, 34a provided on the light shielding ribs 33, 34 are also integrally welded to the rear cover 6 from the back of the rear cover 6, the light shielding ribs 33, 34 are removed by forcibly peeling them off. Inevitably deforms or breaks, making subsequent use difficult. Further, when the welded portion is cut with a milling machine or the like, a large opening is opened in the rear cover 6, and the light shielding is likely to be incomplete, making it difficult to reuse.
[0029]
FIG. 8 shows another example of the reverse rotation preventing claw 22 that is welded to the rear cover 6. The locking piece 24 and the muffling piece 25 have the same shape, but the welded portion 45 (broken line hatched portion) integrally provided above the support portion 23 is a rectangular frame shape and has a U-shape on the rear cover 6 side. This welded portion 45 projects to the back side through an opening formed at a corresponding portion of the rear cover 6, melts and is welded to the rear cover 6. Also in this case, since the reverse rotation preventing claw 22 is fixed to the rear cover 6, the same action as in the previous embodiment can be obtained. Further, when the welded portion 45 is cut with a milling machine or the like for refilling, the engagement piece 24 and the support portion 23 are merely connected by a thin connecting portion 46 as shown in FIG. Since the connecting portion 46 is weak in strength and cannot give the engagement piece 24 enough elasticity to exert a reverse rotation preventing action, it cannot be used as it is even if the film is refilled. The connecting portion 46 can be omitted at all. In this case, when the welded portion 45 is cut, the reverse rotation preventing claw 22 is completely separated and becomes unusable.
[0030]
In another embodiment shown in FIG. 10, the welded portion 48 with broken line hatching protrudes to the back side through an opening formed at a corresponding portion of the rear cover 6, and is melted and integrated with the rear cover 6. In this case as well, the same action as in the previous embodiment can be obtained. Further, when the welded portion is cut, the form shown in FIG. 11 is obtained, and the strength of the base side of the engagement piece 24 of the reverse rotation preventing claw 22 is still insufficient, and when the winding knob 18 is operated in reverse, it easily breaks from the root portion and is expected. The effect of preventing the reverse rotation cannot be obtained.
[0031]
By the way, the used lens unit with lens that has been properly collected is basically subject to reuse of the exposure unit 3 and strobe unit 4, and is used for a new lens unit with lens after inspection and repair processes. However, the main body base 2, the front cover 5, and the rear cover 6 are crushed and melted and pelletized as necessary to be recycled as raw materials. However, in order to provide a film unit with a lens at a lower cost, it is advantageous that the main body base 2 and the like can be reused. Therefore, the main body base 2 of the lens-fitted photo film unit in which the reverse rotation prevention function is lost when the rear cover 6 is separated as described above is reused by performing the recovery process of the reverse rotation prevention function shown in FIG. To be able to.
[0032]
The lens-attached film unit that has been used is collected, and the front cover 5 is first removed from the main body base 2 to separate the exposure unit 3 and the strobe unit 4. These units are incorporated into a new lens-fitted film unit through a function inspection process and a repair process, respectively. In general, the front cover 5 is often scratched or soiled by use, and thus, the front cover 5 is crushed and pelletized as necessary to be recycled as a raw material.
[0033]
Next, the rear cover 6 is separated from the main body base 2. At this time, the welded portions 33a and 34a are cut along a predetermined cutting line with an ultrasonic cutter or the like, but the welded joint portion of the reverse rotation preventing claw 22 is left as it is. Since the reverse rotation prevention claw 22 is integrated with the rear cover 6 by the welded portion 28, it is separated from the main body base 2 and transferred to the rear cover 6 side as described above. As shown in FIG. 13, the separation mark 2 a on the main body base 2 side is in an unshaped state by separating the reverse rotation preventing claw 22. First, the portion is shaped by cutting or the like as shown in FIG. 14. To do.
[0034]
Then, another reverse rotation preventing claw 50 prepared in advance as an additional part is fixed to the shaping trace of the main body base 2. By providing the reversal prevention claw 50 with the protrusions 51a and the recesses 51b corresponding to the shape of the shaping mark, the reversal prevention claw 50 can be easily positioned. In order to fix the reversal prevention claw 50 to the main body base 2, it is possible to use ultrasonic welding as well as bonding by an adhesive and mechanical fixation by engagement of a hook claw. Further, when shaping the separation mark 2a, it is also possible to provide an engaging portion, a positioning hole, or the like used for attaching or positioning an anti-reverse claw as an additional part. Also, instead of attaching a new anti-reverse claw to the main body base 2, after removing the anti-reverse nail transferred to the rear cover and shaping the removal trace in the same manner, The reverse rotation prevention function can be restored.
[0035]
In addition, as the shape of the reverse rotation preventing claw 50 as an additional part, it is possible to use a shape in which the same welded portion 28 as that of the original reverse rotation preventing claw 22 is integrated. In this case, the rear cover is exactly the same. Prepare a new shape part. Then, if the weld part of the new anti-reverse claw protrudes to the back side through the opening of the rear cover, and the reverse-prevention claw and the rear cover are integrated by welding and bonding by exactly the same method, further refilling is surely prevented. be able to. Further, a part of the main body base cut by an ultrasonic cutter or the like when the rear cover 6 is separated can be shielded from light without any problem by providing a separate light shielding member.
[0036]
In addition to the reuse of the main body base 2, the rear cover 6 can also be reused. In this case, as the reverse rotation preventing claw to be newly used as an additional part, for example, as shown in FIG. This reverse rotation prevention claw exerts the reverse rotation prevention action of the winding knob 18 only by being fixed to the main body base 2. Then, the reverse rotation preventing claw transferred to the rear cover 6 is removed by cutting or cutting, and shaped so as not to interfere with the reverse rotation preventing claw, and then the rear cover 6 is assembled to the back surface of the main body base 2 to form a required portion. What is necessary is just to integrate by performing ultrasonic welding or impulse welding.
[0037]
Furthermore, it is possible to reuse the rear cover 6 including the reverse rotation preventing claw 22 that has been transferred at the time of separation from the main body base 2. As shown in FIG. 15, the reverse rotation prevention pawl 22 is separated from the support portion 23 and transferred to the rear cover 6, and is deformed into a shape in which the locking piece 24 is twisted by the force applied during the separation. There are many cases. Therefore, the edge 24a engaged with the winding knob 18 is also inclined, and the reverse rotation preventing function is not reliably restored if it is used as it is.
[0038]
Therefore, as shown in FIG. 16, the auxiliary component 52 is inserted as a spacer between the inner surface of the rear cover 6 and the reverse rotation prevention claw 22, and is adhered to the rear cover 6 as necessary to position the locking piece 24. It is better to correct so that it is restored and keep it in its correct posture. Since the reverse rotation prevention claw 22 is firmly welded to the rear cover 6, if the rear cover 6 is properly assembled to the main body base 2, the original reverse rotation prevention function can be restored.
[0039]
The film unit with lens thus regenerated is not very effective for subsequent illegal refilling because the reverse rotation preventing function is not lost even if the rear cover is separated again. However, when the rear cover is separated again, separation work such as cutting or cutting must be performed again on the ultrasonic welded or impulse welded portion, and not only the appearance but also the light shielding property is not significantly deteriorated. I can't. Therefore, commercialization becomes extremely difficult, and in reality it is not a problem.
[0040]
【The invention's effect】
As described above, according to the film unit with a lens of the present invention, the anti-reverse claw, which is a main functional part of the lens unit with lens, is melt-bonded to the rear cover by welding, and the film unit with the lens is forcibly disassembled. Then, since the reverse rotation preventing claw is configured to surely fail to perform its function, it is possible to prevent the film from being refilled at a low cost. In particular, the present invention is very useful for preventing unauthorized refilling because the welded portion integrated with the reverse rotation preventing claw is passed through the opening to the back side of the rear cover and then welded.
[0041]
Furthermore, the support portion of the reverse rotation preventing claw that becomes the welded portion has a U-shaped cross section so that the strength and elastic force required for the reverse rotation preventing claw are lost when the welded portion is cut or cut. Even if processing is considered, unauthorized refilling can be prevented. Also, because the rear cover is provided with a locking claw so that the welded part is sandwiched between the inner surface of the rear cover, even if the welding head is pressed against the welded part, the position of the reverse rotation preventing claw will not be correct. As a result, a reliable reverse rotation prevention function is achieved, and it is possible to prevent unauthorized refilling by making it difficult to separate the rear cover. Further, the film base unit with the lens having the above-described configuration can be reused normally by adopting a method of adding a reverse rotation preventing claw as an additional part.
[Brief description of the drawings]
FIG. 1 is an exploded front perspective view of a lens-fitted photo film unit embodying the present invention.
FIG. 2 is a rear side exploded perspective view of a lens-fitted photo film unit embodying the present invention.
FIG. 3 is a perspective view showing an appearance of a reverse rotation preventing claw.
FIG. 4 is a cross-sectional view of a main part of the reverse rotation preventing claw.
FIG. 5 is an explanatory view at the time of the welding process of the reverse rotation preventing claw.
FIG. 6 is a cross-sectional view of the main part after welding of the reverse rotation preventing claw.
FIG. 7 is an explanatory view when welding pieces protruding from the light shielding rib are welded.
FIG. 8 is a perspective view showing the appearance of another embodiment of the reverse rotation preventing claw.
9 is a perspective view when a welded portion of the reverse rotation preventing claw shown in FIG. 8 is cut away. FIG.
FIG. 10 is a perspective view showing the appearance of another embodiment of the reverse rotation preventing claw.
11 is a perspective view when a welded portion of the reverse rotation preventing claw shown in FIG. 10 is cut away. FIG.
FIG. 12 is a process diagram for recovering the reverse rotation prevention function after separating the rear cover.
FIG. 13 is a schematic view of the main part showing the separation trace of the reverse rotation preventing claw.
FIG. 14 is an explanatory view when the separation mark of the reverse rotation prevention claw is shaped and a new reverse rotation prevention claw is assembled.
FIG. 15 is a main part schematic view showing a state in which the reverse rotation preventing claw is transferred to the rear cover.
FIG. 16 is an explanatory diagram when the reverse rotation preventing claw transferred to the rear cover is reused.
[Explanation of symbols]
2 Main body base
5 Front cover
6 Rear cover
18 Film winding knob
22 Reverse prevention nail
28 welds
28a, 28b welding piece
30a, 30b opening
31 partition
40,43 welding head
50 New reversing prevention nail
52 Auxiliary parts

Claims (8)

It has a main body base in which a film roll chamber and a cartridge chamber are formed, and a rear cover that is assembled to the back of the main body base and covers the film passage from the film roll chamber to the cartridge chamber in a light-tight manner, and is integrally connected to the main body base. In the film unit with a lens that prohibits the reverse operation of the film winding knob by engaging the leading end side of the provided anti-reversing claw having elasticity with the engaging portion formed along the rotation direction of the film winding knob.
Forming a welded portion projecting to the back side at two spaced apart locations on the base side of the reverse rotation prevention claw ;
The welded portion penetrates through the individual openings formed in the rear cover to the back side of the rear cover, and the penetration portions of the respective welded portions melt together with the partition pieces that partition the openings. Film unit with lens, which is welded and bonded to the back side of the lens. The base side of the reverse rotation prevention claw is integrally connected to the base of the main body via a support portion bent in a U shape so that it protrudes toward the rear cover, and this support portion serves as the weld portion. 2. The lens-fitted photo film unit according to claim 1 , wherein the lens unit is welded to the rear cover. A locking claw is provided on the inner surface of the rear cover for locking the front surface of the welded portion and clamping the welded portion with the rear cover when the welded portion passes through the opening. The film unit with a lens according to claim 1 or 2 . A light-blocking rib that abuts the inner surface of the rear cover and prevents the entry of external light on the back side of the main body base is integrally formed, and the rear cover is formed on the contact surface side of the light-blocking rib with the rear cover. The film unit with a lens according to any one of claims 1 to 3, wherein a second welded portion to be inserted into the second opening is provided, and the second welded portion is melted and welded to the rear cover. It has a main body base in which a film roll chamber and a cartridge chamber are formed, and a rear cover that is assembled to the back of the main body base and covers the film passage from the film roll chamber to the cartridge chamber in a light-tight manner, and is integrally connected to the main body base. The front end side of the anti-reverse claw having elasticity is engaged with the engaging portion formed along the rotation direction of the film winding knob so that the reverse operation of the film winding knob is prohibited, and the reverse side of the reverse rotation claw In the reuse method of the film unit with a lens in which the welded part integrally molded so as to protrude to the side is welded to the rear cover,
When the rear cover of the lens-fitted photo film unit collected after use is separated, the anti-reverse claw is separated from the main body base. Alternatively, the method for reusing a lens-fitted photo film unit is characterized in that it is fixed to the rear cover and the reverse operation of the winding knob is prohibited. It has a main body base in which a film roll chamber and a cartridge chamber are formed, and a rear cover that is assembled to the back of the main body base and covers the film passage from the film roll chamber to the cartridge chamber in a light-tight manner, and is integrally connected to the main body base. Reuse method of a film unit with a lens in which the tip end side of the provided anti-reverse claw having elasticity is engaged with a locking portion formed along the rotation direction of the film winding knob to prohibit the reverse operation of the film winding knob In
The welding part is formed integrally with the reverse rotation prevention claw so that it protrudes to the back side, and this welding part is welded to the rear cover, and the rear cover of the used lens-fitted film unit is separated from the main body base. The reversing prevention claw is transferred to the rear cover and separated from the main body base, and the reversing prevention claw separation trace of the main body base and the reversing prevention claw transferred to the rear cover are removed and the removal trace is shaped. Later, when the reversing prevention claw prepared as a new part is fixed to the main body base or the rear cover and the main body base and rear cover of the lens film unit are reused and the new film unit with lens is assembled, the rewinding knob reverses. A method for reusing a film unit with a lens, characterized in that the operation is prohibited. It has a main body base in which a film roll chamber and a cartridge chamber are formed, and a rear cover that is assembled to the back of the main body base and covers the film passage from the film roll chamber to the cartridge chamber in a light-tight manner, and is integrally connected to the main body base. Reuse method of a film unit with a lens in which the tip end side of the provided anti-reverse claw having elasticity is engaged with a locking portion formed along the rotation direction of the film winding knob to prohibit the reverse operation of the film winding knob In
The welding part is formed integrally with the reverse rotation prevention claw so that it protrudes to the back side, and this welding part is welded to the rear cover, and the rear cover of the used lens-fitted film unit is separated from the main body base. The reverse rotation prevention claw is transferred to the rear cover and separated from the main body base, and the deformation of the reverse rotation prevention claw deformed and transferred to the rear cover along with the separation step is corrected, and then the rear cover is deformed. A method of reusing a film unit with a lens, characterized in that it is used in a new lens unit with a lens together with a reverse rotation preventing claw and prohibits the reverse operation of the winding knob. 8. The lens according to claim 7 , wherein a newly prepared auxiliary part is assembled to the cover after the reverse rotation preventing claw is transferred, and the auxiliary rotation preventing nail is maintained in a predetermined posture after correction by the auxiliary part. How to reuse attached film units.

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