JP3133194B2 - Film unit with lens - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens-fitted photo film unit in which a photo film is previously incorporated at the time of manufacture.

[0002]

2. Description of the Related Art A film unit with a lens is a unit body having a simple photographing mechanism in which an unexposed roll film with a patrone is built in advance, so that a photograph can be easily taken without carrying a camera. It can be carried out.
A 135-film cartridge conforming to the ISO standard is used for the film unit with a lens. At the time of assembling, the film is pulled out from the cartridge and assembled into a roll, and loaded into the cartridge chamber and the film chamber, respectively. In use, when a film winding operation is performed every time a photograph is taken, the photographed film is sequentially wound into the cartridge.

Prior to loading a film and a patrone into the unit body, a film drawer is used to draw out the film from the patrone and put it into a roll. This device is provided with a patrone holding portion and a winding shaft for winding the film, and the leading end of the film coming out of the patrone is locked to the winding shaft, and then the winding shaft is driven. While pulling out the film, the film is wound up in a roll around a winding shaft.

[0004]

When the above-described film drawing device is used, the leading end of the film is easily bent by being locked to the winding shaft, and the center of the film roll has a curl. Easy to do. When such a film roll is loaded into the film chamber of the unit main body, even if the film roll is slightly loosened, the winding habit remains in the central portion. In such a state, when filming proceeds and the film is near the final end, the film chamber exit, which is the boundary between the film guide surface that guides the movement of the film between the film room and the patrone room and the inner wall of the film room, In some cases, the curl may be clogged and cannot be drawn out smoothly.

FIG. 5 is a sectional view showing the vicinity of a film chamber when a conventional general film unit with a lens is cut horizontally. Immediately after the start of use when the film 2 is almost still in the film chamber 3 as shown in (A), the film 2 is smoothly fed out from the film chamber outlet 3a without any problem.

However, as shown in FIG. 2B, when the photographing has progressed to near the last frame, a considerable portion of the film 2 is wound around the patrone, and there is room in the film chamber 3 when the film is free. Since the rear end of the film 2 has a curl, it does not loosely spread inside the film chamber 3, and the rear end 2a of the film 2 is pulled toward the film chamber outlet 3a and moves. As a result, the rear end portion 2a of the film 2 having a curl may be caught at the film chamber outlet 3a, and the winding torque may increase. In extreme cases, the winding may not be possible.

The present invention has been made in consideration of the above-mentioned problems of the prior art. Even if a slight curl remains in the center of the film roll, the center of the film roll is directed toward the exit of the film chamber. It is an object of the present invention to provide a lens-fitted film unit that does not move and is not caught at the exit of the film chamber.

[0008]

In order to achieve the above object, a film unit with a lens according to the present invention comprises: a film chamber for accommodating a rolled film drawn from a patrone; and a patrone chamber for accommodating the patrone. A film guide surface for guiding the movement of the film facing the exposure surface of the film between the two chambers, and slidingly contacting both side edges of the film at positions where the perforations are arranged from the film guide surface to the inner surface of the film chamber. And a unit body in which a pair of ridges each having a width smaller than the width of the perforation are integrally formed, and a rear cover that is covered on the back surface of the unit body so as to cover both the chambers and the film guide surface in a light-tight manner. When the film is fed, the boundary between the inner surface of the film chamber and the film guide surface and the rear cover Drawer of the film is made from the film chamber through the slit-shaped film outlet formed between all of the film is after the photographing of all frames is completed
In the film unit with the lens which is discharged from the film chamber, the height in the longitudinal direction and the width direction of the ridge is the height of the ridge on both sides of at least one of the ridges at the boundary portion.
The slopes that gradually decrease from each other are constructed in series, and the maximum width including the ridge is a roughly rhombus wider than the perforation width.
A widened portion is provided .

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 is an exploded perspective view of a film unit with a lens according to the present invention. The unit main body 5 includes a shutter unit 6, a photographing lens 7, a photographing unit 9 incorporating a finder lens 8, a built-in strobe device 12, a main body 13, a front cover 14 fixed to the front and rear by the front and rear, and a rear cover-1.
5 is comprised.

The front cover 14 has a photographing lens 7, a finder lens 8, a photograph number display plate 16, and a winding knob 1.
There is a hole to expose 7 etc.
A release button 18 is provided integrally. Main unit 1
3, a film chamber 19 and a film chamber 21 are formed at both ends, and the film chamber and the film chamber 21 are internally provided.
Film rolls drawn out from the machine and assembled into a roll are stored.

The rear cover 15 is integrally provided with a film chamber bottom lid 23 integrally formed with a bottom panel 22 and a boss 30 projecting therefrom. The bottom of the panel chamber 19 and the bottom of the film chamber 2 are integrally provided.
The bottom of each of the light-emitting devices 1 is light-tightly covered.

The built-in strobe device 12 is provided with a strobe light emitting section having a built-in flash discharge tube, electrodes 26 for connecting the capacitor 25 to the charging circuit by short-circuiting the contact pieces 24a and 24b. The electrode 26 is turned on by pressing the charge start button 27 of the front cover 14.

Further, since the film unit with a lens takes 39 shots, the diameter of the film chamber 21 is large. Therefore, when assembling the film unit with a lens, when placing the film in the mounting position of the electrode 26, In order to prevent unstable play due to the curvature of the outer surface of the chamber 21, a bent portion 26a is provided to prevent the film chamber 2 from being bent.
It is machined so as to get over the arc-shaped outer wall.

FIG. 1 is an exploded perspective view of the rear side of a film unit with a lens embodying the present invention. The inner wall 21b of the film chamber 21 prevents the back surface of the film 31 from being rubbed against the inner wall 21b of the film chamber 21 and prevents the film 31 from being damaged. In order to be fed out, two rail-shaped projections 32a and 32b are provided along the inner wall of the film chamber 21 in the direction of the patrone chamber. The projections 32a and 32b support the side edges of the film 31 housed in a roll shape in the film chamber 21 from the back.

One ridge 32a is a film chamber outlet 21a which is a boundary between the film guide surface for guiding the movement of the film 31 between the film chamber and the patrone chamber and the inner wall of the film chamber 21, as shown in FIG. Nearby, Film 3
A widened portion 32c that is wider than the width of one perforation 31a and that extends in a diamond shape is provided.

A corner 21c is formed near the film chamber outlet 21a between the inner wall 21b of the film chamber 21 and the drawing direction of the film 31, and further, near the corner 21c of the inner wall 21b of the film chamber 21. A rough surface 21d having a constant width and a slight unevenness on the surface is formed slightly inclined toward the cartridge chamber. With the rough surface 21d and the widened portion 32c described above, in the final stage of film winding,
The terminal 31b of the film 31 is prevented from clogging the film chamber outlet 21a.

The operation of the above configuration will be described. Immediately after the photographing of the film unit with the lens is started, the film 31 is fully wound and loosened in the film chamber 21, and the rear surface of the outermost film 31 is held by the ridges 32a and 32b. From this state to the vicinity of the middle of the total number of shot frames of the film 31, even if the film 31 is wound up and the remaining amount in the film chamber 21 decreases, the rear surface of the outermost periphery of the film 31 is always protruded by the elasticity of the film 31. The film is smoothly fed out from the film chamber outlet 21a while being supported by 32a and 32b.

When the number of remaining frames of the film 31 is reduced to less than half as the shooting progresses, the film 31 does not fully wind in the film chamber 21 due to a slight winding habit, and the outermost peripheral back surface has a ridge 32a. b Although some parts do not come into sliding contact with each other, the roll-shaped film 31 is disengaged from the film chamber outlet 21 by engagement with the boss 30 protruding from the film chamber bottom cover 23.
In order to prevent the paper from being pulled and clogged in the direction a, the film is smoothly fed out from the film chamber outlet 21a.

Further, when the final photographing frame is reached, the end of the film 31 is only half the width, so that the film 31 is disengaged from the boss 30 and has a strong curl.
Is not loosened in the film chamber 21, and the terminal 31b, which is still curled at the time of final winding, is drawn toward the film chamber outlet 21a.

However, as shown in FIG. 4, since the corner 21c is formed in the film chamber outlet 21a, the terminal end 31b is not drawn into the film chamber outlet 21a, but is formed by the unevenness of the rough surface 21d. The winding habit of the end portion 31b is loosened, and the end portion 31b is smoothly fed out in the winding direction.

Furthermore, since the widened portion 32c of the ridge 32a is wider than the width of the perforation 31a,
This prevents the perforations 31a from being caught on the protruding ridges 32a bent near the corners 21c, thereby preventing the winding up.

[0022]

As described above, according to the film unit with lens of the present invention, at least one of the ridges on both sides of the boundary between the inner surface of the film chamber and the film guide surface.
The height of the ridge in the longitudinal and width directions is
Tapering slope constructed by consecutively provided respectively, the maximum width including a protrusion is provided to expand <br/> width portion having a substantially rhombic wider than the perforation width, there is curl at the rear end portion of the film hand
Also, it is possible to prevent the perforations of the film from being caught at the corners of the ridge and the edge of the widened part that are bent near the boundary, and all the film can be smoothly removed from the film chamber.
Ru can be discharged.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a rear side of a lens-fitted film unit embodying the present invention.

FIG. 2 is an exploded perspective view of the front side of the film unit with a lens shown in FIG.

FIG. 3 is an enlarged perspective view of an upper part of a film chamber of the film unit with a lens shown in FIG.

FIG. 4 is a sectional view of the vicinity of a film chamber of the film unit with a lens shown in FIG. 1;

FIG. 5 is a cross-sectional view of a film unit with a lens of a conventional example near a film chamber.

[Explanation of symbols]

 21 Film Chamber 21a Film Chamber Outlet 21c Corner 21d Rough Surface 26 Electrode 26a Bend 31a End 32a, b Projection 32c Widening

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G03C 3/00 575 G03B 17/04 G03B 17/30

Claims (1)

(57) [Claims] 1. A film chamber for accommodating a roll of film drawn from a patrone, a patrone chamber for accommodating the patrone, and a film guide between the two chambers facing the exposure surface of the film. A film guide surface and a pair of ridges extending from the film guide surface to the inner surface of the film chamber and integrally slidably in contact with both side edges of the film at positions where the perforations are arranged and having respective widths smaller than the width of the perforations were integrally formed. A unit body, and a rear cover that is placed on the back surface of the unit body so as to cover both the chambers and the film guide surface in a light-tight manner, and at the time of film feeding, a boundary portion where the inner surface of the film chamber and the film guide surface are substantially orthogonal to each other. Draws out the film from the film chamber through the slit-like film outlet formed between Was performed , and shooting of all frames was completed.
Later, in the film unit with a lens from which all the film is discharged from the film chamber , the height in the longitudinal direction and the width direction of the protrusion is provided on both sides of at least one of the protrusions at the boundary . Gradually decreases from the height of
A film unit with a lens, characterized in that it comprises a plurality of slopes connected to each other, and a broadened portion having a substantially rhombic shape whose maximum width including a ridge is larger than a perforation width.