JP3614983B2 - Film unit with lens - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a film unit with a lens, and more particularly to an improvement of a film unit with a lens that improves assembly suitability.
[0002]
[Prior art]
Various types of lens-equipped film units that have a simple photographing mechanism and are pre-loaded with an unexposed photographic film and a cartridge are on the market. The lens-fitted photo film unit is composed of a main body part in which a photographic film and a cartridge are loaded and a photographing mechanism is assembled, and a front cover and a rear cover that are assembled from the front side and the rear side so as to sandwich the main body part. Yes. Conventionally, the entire film unit with a lens was covered with a paper box. However, because of the effect of reducing the cost and making it look small, it is now decorative so that the central part of the film unit with a lens is not hindered by a belt-like label. Some of them are covered.
[0003]
The lens-fitted photo film unit is assembled, for example, in the order of assembling the photographing mechanism to the main body, assembling the front cover to the main body, loading the photographic film and cartridge to the main body, and assembling the rear cover to the main body. It has been. When the photographic film and cartridge are loaded, the main body is placed on a holding table that firmly supports the front cover with the front side facing downward. The cartridge is loaded in the axial direction from the lower surface side of the main body, and the photographic film is wound in a roll shape and loaded from the rear surface side. The rear cover is finally assembled from the back side of the main body so as to shield the photographic film loaded in the main body.
[0004]
The assembly of each part to the main body is performed by engagement between the engaging claws formed on the main body part or between the engaging claws and the engaging holes. The assembly of the rear cover to the main body is performed by engaging engagement claws formed on both side surfaces of the main body and engagement holes formed on both side surfaces of the rear cover.
[0005]
[Problems to be solved by the invention]
In the lens-fitted photo film unit, the thickness of the main body portion protected by the front cover and the rear cover is reduced overall in order to reduce the size. Further, since a paper box is not used, the gap between the front cover and the rear cover is reduced to improve the appearance of foreign matter and the appearance. However, these improvements have caused a problem that the rear cover cannot be properly assembled to the main body. This is because when the main body is pressed during assembly of the rear cover, the main body is distorted or sinks into the front cover, and the rear cover engagement claw formed on the side surface of the main body and the front cover The distance from the side edge becomes narrow, and the side edge of the rear cover comes into contact with the side edge of the front cover before the engagement hole of the rear cover engages with the engagement claw. ing.
[0006]
The present invention is for solving the above-described problems, and an object of the present invention is to prevent a rear cover or a front cover from being assembled incorrectly due to distortion of the main body.
[0007]
[Means for Solving the Problems]
In order to solve the above-described problems, the lens-fitted photo film unit of the present invention is convex in the vicinity of the other cover engaging claw formed on the side surface of the main body , and downstream in the mounting direction of the other cover. The receiving part which receives this convex part is formed in the inner wall surface of one cover.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a film unit with a lens embodying the present invention will be described with reference to the accompanying drawings. As shown in FIG. 2, the lens-fitted photo film unit 2 includes a unit main body 3 in which a photographic film is previously loaded and various photographing mechanisms are incorporated, and a label 4 that partially covers the unit main body 3.
[0009]
A shutter button 6 and a counter window 7 are provided on the upper surface of the unit body 3, and a finder 8 and a photographing lens 9 are provided on the front surface. Further, a winding knob 10 that is rotated every time one frame is photographed is exposed from the back side. The label 4 is a strip-shaped piece of paper having an adhesive applied to the back surface, and is attached so as to be wound around the central portion of the unit body 3. The label 4 is formed with an opening for exposing the photographing lens 9, the finder 8, the counter window 7 and the like to the outside. The lens-equipped film unit 2 uses a film cartridge compatible with the advanced photo system.
[0010]
As shown in FIG. 3, the unit main body 3 includes a main body portion 13 in which the film cartridge 12 is loaded, an exposure unit 14 assembled on the front surface of the main body portion 13, and a front side and a rear side so as to sandwich the main body portion 13. It is comprised from the front cover 15 and the rear cover 16 assembled | attached to. The main body portion 13 protected by the front cover 15 and the rear cover 16 is generally reduced in thickness in order to reduce the cost and size of the lens-fitted photo film unit 2.
[0011]
The film cartridge 12 includes a plastic cartridge main body 18 and a photographic film 19 accommodated in the cartridge main body 18. In the cartridge body 18, a spool 20 to which one end of the photographic film 19 is locked is rotatably incorporated, and a film feeding mechanism as disclosed in Japanese Patent Laid-Open No. 6-266053 is incorporated. . Also, a rod-shaped light shielding lid 21 that opens and closes the film doorway by being rotated from the outside is incorporated in a film doorway (not shown) through which the photographic film 19 enters and exits the cartridge body 18.
[0012]
A light shielding cylinder 23 is provided at the center of the main body base 13 to shield the photographing optical path from the photographing lens 9 to the photographic film 19. An opening 24 is formed on the front side of the light-shielding tube 23 to guide the subject light transmitted through the photographing lens 9 to the photographic film 19, and an aperture for defining the exposure range of the photographic film 19 is formed on the back side. Has been.
[0013]
A cartridge chamber 26 and a film roll chamber 27 in which the cartridge main body 18 and the roll of photographic film 19 are respectively stored in the manufacturing stage are integrally formed on both sides of the light shielding cylinder 23. In the cartridge chamber 26 and the film roll chamber 27, the rear cover 16 is assembled on the back side of the main body 13, and the bottom cover 29 for the cartridge chamber formed integrally with the rear cover 16 and the bottom cover 30 for the film roll chamber. A proper light shielding ability can be obtained by closing and. The bottom lids 29 and 30 are connected to the rear cover 16 through a thin portion that can be bent. The bottom lid 29 is opened when the film cartridge 12 is taken out from the lens-fitted film unit 2 after use. The
[0014]
A winding knob 10 is rotatably mounted on the upper part of the cartridge chamber 26. The winding knob 10 has a drive shaft formed on the lower surface engaged with the spool 20 of the cartridge body 18. Then, the photo film 19 is wound up by the spool 20 by being rotated counterclockwise in the drawing every time one frame is shot. Further, the hoisting knob 10 is prevented from rotating in the reverse direction because the check pawl 32 formed on the upper surface of the cartridge chamber 26 is engaged with the outer periphery. Although not shown, a light shielding lid closing mechanism for closing the light shielding lid 21 in conjunction with the opening of the bottom lid 29 when the film cartridge 12 is taken out from the cartridge chamber 26 is incorporated in the upper surface and side surface of the cartridge chamber 26. Yes.
[0015]
In the exposure unit 14, a shutter charge mechanism, a shutter release mechanism, a film winding mechanism, and a film count mechanism are integrally incorporated together with the photographing lens 9 and the finder lens 34. And it is detachably assembled to the front surface of the light shielding cylinder 23 of the main body 13 by claw engagement.
[0016]
The front cover 15 is integrally formed with the shutter button 6, and is detachably assembled to the front side of the main body 13. The front cover 15 is assembled to the main body 13 by two engagement holes 36 formed on each side of the front cover 15 and two engagement claws formed on each side of the main body 13. 37 or the like.
[0017]
The rear cover 16 is formed with a film support surface 16 a that supports the back surface of the photographic film 19 behind the aperture of the main body 13. The rear cover 16 is assembled to the main body portion 13 by engaging engagement holes 39 formed on both side surfaces of the rear cover 15 with engagement claws 40 formed on both side surfaces of the main body portion 13. Is done by.
[0018]
On the side surface of the cartridge chamber 26 of the main body 13 and on the front side in the vicinity of the engaging claw 40, a step portion 42 that is a convex portion is formed. A receiving portion 43 is integrally formed at a position facing the step portion 42 on the inner wall surface of the front cover 15. As shown in FIG. 1, the stepped portion 42 and the receiving portion 43 come into contact with each other when the front cover 15 is assembled to the main body portion 13.
[0019]
Conventionally, since the front surface 26a of the cartridge chamber 26 is brought into contact with the inner wall of the front surface of the front cover 15, the side surfaces of the main body 13 and the front cover 15 are easily bent at the corner portions, and the rear cover 16 is not assembled correctly. Had occurred. However, even when the main body portion 13 is pressed against the rear cover 16 when the rear cover 16 is loaded after the film is loaded, the stepped portion 42 is supported by the receiving portion 43 on the side surface of the cartridge chamber 26, so that the deformation at that time The amount is negligible. Since the distance between the engagement claw 40 for the rear cover 16 and the side edge 15a of the front cover 15 is kept substantially constant, before the engagement hole 39 and the engagement claw 40 are engaged, the rear Assembling failure of the rear cover 16 caused by the contact between the side edge 16b of the cover 16 and the side edge 15a of the front cover 15 is prevented. In addition, the effect of preventing deformation becomes higher as the stepped portion 42 and the receiving portion 43 are provided closer to the side edge 15a of the front cover 15.
[0020]
Next, the operation of the above embodiment will be described. Each part of the lens-fitted photo film unit 2 is attached while the main body 13 is being conveyed. First, the main body 13 is placed and transported on a holding table with the back side facing downward. In the main body 13 being transported, the light shielding lid rotating mechanism is first assembled on the upper surface and the front surface of the cartridge chamber 26, and then the exposure unit 14 is assembled on the front surface of the light shielding cylinder 23. After the exposure unit 14 is assembled, the winding knob 10 is assembled on the upper surface of the cartridge chamber 26. And the front cover 15 is assembled | attached by the engagement of the engagement hole 36 and the engagement nail | claw 37 on the front side of the main-body part 13 so that the front side of the main-body part 13 in which each component was assembled | attached. Thereby, the step part 42 of the main body part 13 and the receiving part 43 of the front cover 15 abut.
[0021]
As shown in FIG. 1, the main body 13 to which the front cover 15 is assembled is placed on the holding table 45 with the front side facing downward. In this state, the cartridge main body 18 is wound from the back of the main body 13 into the cartridge chamber 26, and the photographic film 19 drawn out from the cartridge main body 18 is wound into a roll shape and loaded into the film roll chamber 27.
[0022]
After the film cartridge 12 is loaded, the rear cover 16 is assembled. When the rear cover 16 is assembled, the main body 13 may be distorted by the pressing of the rear cover 16. However, since the step portion 42 formed on the side surface of the main body portion 13 is supported by the receiving portion 43 of the front cover 15, the side wall of the main body portion 13 is not greatly deformed, and the engaging claw for the rear cover 16. The distance between 40 and the side edge 15a of the front cover 15 does not change. For this reason, the side edge 16b of the rear cover 16 abuts on the side edge 15a of the front cover 15, and the assembly failure that the engagement hole 39 and the engagement claw 40 are not engaged does not occur.
[0023]
In the above embodiment, the step portion and the receiving portion are provided only on the cartridge chamber side, but the step portion and the receiving portion may be provided also on the film roll chamber side. In addition, the stepped step portion formed integrally with the main body portion is used as the convex portion and the receiving portion. However, if it is in contact with each other and suppresses deformation of the main body portion, a protrusion or pin is used. Can do. Further, when the front cover is assembled after the rear cover is first assembled to the main body, a receiving portion is provided on the rear cover, and a stepped portion received by the receiving portion is provided on the main body.
[0024]
【The invention's effect】
As described above, the lens-fitted photo film unit according to the present invention forms a convex portion in the vicinity of the other cover engaging claw formed on the side surface of the main body portion and downstream in the mounting direction of the other cover. And since the receiving part which receives this convex part was formed in the inner wall surface of one cover, the deformation | transformation of the side wall of a main-body part can be reduced, and the assembly | attachment defect to the main-body part of a back cover or a front cover can be prevented. .
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an essential part of a lens-fitted photo film unit according to the present invention.
FIG. 2 is a perspective view showing an appearance of a lens-fitted photo film unit.
FIG. 3 is an exploded perspective view showing a configuration of a lens-fitted photo film unit.
[Explanation of symbols]
2 Film unit with lens 3 Unit body 4 Label 12 Film cartridge 13 Body 15 Front cover 16 Rear cover 39 Engagement hole 40 Engagement claw 42 Step part 43 Receiving part

Claims (1)

A main body loaded with a photographic film and a cartridge;
Engagement holes that engage with the engaging claws formed on the side surfaces of the main body are formed, respectively, before being assembled to the front side and the rear side so as to sandwich the main body with the edges of each other being abutted. A cover and a rear cover;
In the film unit with a lens in which one of the covers is first assembled to the main body, the one cover is fixed, and the other cover is assembled to the main body .
In the vicinity of the engagement claw for the other cover formed on the side surface of the main body, a convex portion is formed on the downstream side in the mounting direction of the other cover, and a receiving portion for receiving the convex portion is formed on one cover. A film unit with a lens , which is formed on an inner wall surface and prevents the main body from being elastically deformed to one cover side when the other cover is attached .

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