JPH09133988A - Film unit with lens - Google Patents

Abstract

PROBLEM TO BE SOLVED: To keep operating physical force necessary for the operation of a film wind knob low even though a film unit with a lens is thinned, and to improve the operability of the film wind knob. SOLUTION: The film wind knob 26 for winding photographic film 21 is pivotally attached to the peripheral part 25a of an aperture 25. The peripheral part 25a is formed to be deviated toward a back cover from the rotary shaft (a) of a spool 22 piercing an aperture 25, and the rotary shaft (b) of the knob 26 pivotally attached to the peripheral part 25a is deviated toward the back cover from the rotary shaft (a) of the spool 22. A driving shaft 26a where external teeth 26b are engraved is integrally provided on the lower surface of the knob 26. The outside diameter of the driving shaft 26a is formed to be considerably smaller than the inside diameter of the shaft hole 22a of the spool 22, and a part of the external teeth 26b of the driving shaft 26a is meshed with the internal teeth 22b of the shaft hole 22a in a state where their rotary shafts are deviated each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens-fitted film unit.

[0002]

2. Description of the Related Art A lens-fitted photo film unit is a unit having a simple photo-taking mechanism and a pre-exposed photo film patrone built-in so that it is easy to take a photo without carrying a camera. From the applicant, for example, "It's a Super copy" (brand name)
Etc. are widely provided to the general public.

A film unit with a lens is generally
A 135 film cartridge that conforms to the ISO standard is used. Then, at the time of assembling, the photo film is pulled out from the patrone and collected into rolls and loaded into the patrone chamber and the film chamber, respectively, or 13
After loading the 5 film patrone into the patrone chamber,
Pull out the photo film from the cartridge and store it in a roll in the film chamber. And at the time of use, every time you shoot
When a film winding operation is performed by rotating a winding knob that is engaged with the spool of the cartridge body, the photographed films are sequentially wound into the cartridge.

Such a lens-fitted photo film unit has been constantly improved in its components and structure.
The external size of the latest type of film unit with lens is
Compared to the early model, it is much smaller.
In particular, the thickness of the lens-fitted film unit has a great influence on its portability, and the thickness of the lens-fitted film unit in recent years has become thinner and thinner.

[0005]

As described above, when the outer shape of the lens-fitted photo film unit, in particular, the thickness of the photo film unit is significantly reduced, the winding knob for performing the film winding operation is inevitably of a small diameter. become.
However, when the winding knob has a smaller diameter, the operation of the winding knob becomes heavier, and the operating force thereof increases as the winding knob has a smaller diameter. As a result, the comfortable operability of the lens-fitted film unit is deteriorated, and the film winding operation becomes very troublesome, which is a problem.

Further, when the winding knob has a small diameter, the amount of protrusion of the peripheral surface of the winding knob protruding from the rear surface of the lens-fitted film unit becomes small, which makes it difficult to rotate the winding knob.

On the other hand, even if the film unit with lens is made thin, if the winding knob has a large diameter as before, the operating force of the winding knob will not be large, but this time, the winding knob has a front surface of the film unit with lens. Not only does the appearance deteriorate, but portability also deteriorates.

The present invention has been made in consideration of the above-mentioned problems of the prior art. Even when the film unit with a lens is made thin, the operating force required for operating the winding knob is kept low and the winding knob is operated. An object of the present invention is to provide a lens-fitted film unit having improved performance.

[0009]

In order to achieve the above object, the present invention provides a lens-fitted film unit according to the present invention, wherein the rotation center of a drive shaft provided on a winding knob is rearward with respect to the rotation center of a spool. It is eccentric to the side. Further, in the present invention, the engaging portion has a plurality of inner teeth formed on the inner wall of the shaft hole at the upper end of the spool, and the drive shaft fits in the shaft hole and meshes with the inner teeth on the outer periphery. It has external teeth.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. 2 is an exploded perspective view of a lens-fitted photo film unit embodying the present invention, and FIG. 3 is a cross-sectional view of the vicinity of the cartridge chamber. The lens-fitted film unit 2 is composed of a photographing unit 6 incorporating a shutter device 4, a photographing lens 5 and the like, a main body portion 7 and a front cover 8 and a rear cover 9 which are fixed to the front and rear by the main body portion 7.

The front cover 8 is provided with holes for exposing the taking lens 5, the finder 11, the number-of-images display plate 12, and the like, and a release button 14 is integrally provided. The main body 7 has a pattern chamber 16 and a film chamber 1 on both sides with an aperture 10 which is an exposure opening interposed therebetween.
7 are integrally formed. A photographic film patrone 18 and a film roll 21a, which is a roll of the photographic film 21 pulled out from the patrone body 19, are housed inside.

A spool 22 is pivotally mounted on the main body 19 of the photographic film cartridge 18 as described above. A photo film 21 is wound around the spool 22, and one end of the photo film 21 is projected from the main body 19 of the cartridge.
As shown in FIG. 1, a shaft hole 22a having an inner tooth 22b as an engaging portion is formed on the inner surface of the spool 22 protruding from the cartridge body 19. The inner teeth 22b are provided on a drive shaft 26 of a winding knob 26, which will be described later.
It meshes with some of the external teeth 26b carved in a.

The photographic film 21 has an emulsion layer formed on the basis of annealed polyethylene terephthalate (PET) or polyethylene naphthalate (PEN) in the range of 40 ° C. to the glass transition point or lower. PET or PEN that has been subjected to such an annealing treatment
Is more rigid than the conventional acetyl film (TAC) used for photographic film bases and has a high shape recovery property, so it can be made thinner than TAC-based photographic film. The hoisting force can be reduced.

The spool 2 is provided on the upper surface of the patrone chamber 16.
There is provided an opening 25 into which one end of 2 penetrates and projects. A winding knob 26 for winding up the photographic film 21 is pivotally attached to the peripheral edge portion 25a of the opening 25. As shown in FIG. 1, the peripheral edge portion 25 a extends from the rotation axis a of the spool 22 penetrating the opening 25 to the rear cover 9 a.
The rotation shaft b of the winding knob 26 pivotally attached to the peripheral edge portion 25a is displaced from the rotation shaft a of the spool 22 in the rear cover 9 direction.

External teeth 26b are provided on the lower surface of the winding knob 26.
Is integrally provided with a drive shaft 26a on which is carved. The outer diameter of the drive shaft 26a is formed to be considerably smaller than the inner diameter of the shaft hole 22a of the spool 22.
6 is pivotally attached to the peripheral edge portion 25a of the photographic film cartridge 1.
When 8 is housed in the cartridge chamber 16, the drive shaft 26a penetrates into the shaft hole 22a. And, as shown in FIG.
In the state where the rotation axes are displaced from each other, a part of the outer teeth 26b of the drive shaft 26a meshes with the inner teeth 22b of the shaft hole 22a. In this way, the winding knob 26 and the spool 22 are in a state of interlocking with each other by the eccentric gear.

The rear cover 9 has a bottom cover 9a for the patrone chamber,
Also, a film chamber bottom cover 9b is integrally provided so as to cover the bottom of the film chamber 16 and the bottom of the film chamber 17 in a light-tight manner. Further, an opening 9c is provided at the upper end of the rear cover 9, and a part of the winding knob 26 is exposed.

The operation of the above configuration will be described. At the time of winding the film of the lens-fitted film unit 2, the winding knob 26 exposed from the opening 9c of the rear cover 9 is rotated. When the winding knob 26 rotates,
The drive shaft 26a formed integrally also rotates. Drive shaft 26
Since the outer tooth 26b of "a" meshes with the inner tooth 22b of the shaft hole 22a, the spool 22 is rotated by the rotation of the drive shaft 26a. As a result, the photographed photo film 21 is wound up inside the patrone body 19.

A peripheral portion 25 around which a winding knob 26 is attached.
a is formed so as to deviate from the rotation axis a of the spool 22 penetrating into the opening 25 toward the rear cover 9, and the rotation axis b of the winding knob 26 and the rotation axis a of the spool 22 are eccentric to each other, and the external teeth 26b. And internal teeth 22b.

As a result, the winding knob 26 is attached to the spool 2
Since the winding knob 26 is pivotally mounted at a position deviated in the direction of the rear cover 9 from the rotation axis a, even if the winding knob 26 is used with a thin lens-fitted film unit 2 having a small diameter, the winding knob 26 will not move backward. Since it is sufficiently exposed from the opening 9c of the cover 9, the photographer can easily rotate the winding knob 26. Further, since the winding knob 26 is axially attached at a position displaced toward the rear cover 9,
The peripheral surface of the film does not unsightly protrude from the front surface of the lens-fitted film unit 2.

The outer diameter of the drive shaft 26a is the same as that of the shaft hole 22a.
Is formed to be much smaller than the inner diameter of the outer tooth 26b.
Since the rotation of the internal teeth 22b when rotating is a combination of the reduction gears, even if the winding knob 26 has a small diameter, the photographer can easily rotate the winding knob 26 with a light force.

By the way, the film unit with a lens is originally made as a product in which the film cannot be separated from the main body of the unit, but some users or developing shops use the film by refilling it and selling it. There is something to do. However, if the film is refilled in this way, it becomes difficult to maintain the high quality of the lens-fitted film unit, and film winding defects may occur, and in extreme cases, problems such as photosensitivity due to light leakage may occur. . And, the high reliability of the lens-fitted film unit is impaired.

Such an adverse effect is especially caused by the above-mentioned inner teeth 22.
This occurs when a film cartridge using a conventional spool without b is refilled. However, in the above-described lens-fitted film unit 2, even if the film cartridge having a spool without internal teeth is refilled,
The outer teeth 26b of the winding knob 26 do not engage with the spool, and the spool is disabled from the beginning, and the above-mentioned adverse effects do not occur.

In the above-mentioned embodiment, the engagement means between the drive shaft of the winding knob and the shaft hole of the spool is gear meshing of the inner teeth and the outer teeth, but the engagement means is of course limited to this. Not a thing. Further, although PET and PEN resin are used for the photographic film base, of course, other various resins may also be used.

[0024]

As described above, according to the lens-fitted photo film unit of the present invention, the rotation center of the drive shaft provided on the winding knob is eccentric to the rear side with respect to the rotation center of the spool. In the second aspect, the engaging portion has a plurality of inner teeth formed on the inner wall of the shaft hole at the upper end of the spool, and the drive shaft is fitted in the shaft hole and has outer teeth provided on the outer periphery for meshing with the inner teeth. Even when the lens-fitted film unit is made thin, it is possible to provide a lens-fitted film unit in which the operating force required to operate the winding knob is kept low and the operability of the winding knob is improved.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing the vicinity of a cartridge chamber of a lens-fitted film unit embodying the present invention.

FIG. 2 is an exploded perspective view of a lens-fitted film unit embodying the present invention.

FIG. 3 is a cross-sectional view of the vicinity of a cartridge chamber of the lens-fitted film unit embodying the present invention.

[Explanation of symbols]

 2 Film unit with lens 16 Patrone chamber 18 Photo film Patrone 22 Spool 22a Shaft hole 22b Inner tooth 25 Opening 25a Peripheral part 26 Winding knob 26a Drive shaft 26b External tooth

Claims (2)

[Claims] 1. A patrone chamber for storing a patrone,
A film chamber for storing the film drawn out from the cartridge in a roll shape is provided, and a drive shaft is provided on a rotatable winding knob at an upper portion of the cartridge chamber, and the drive shaft is provided at an upper end of a spool of the cartridge. A lens-fitted film unit adapted to be engaged with an engagement portion and to rotate the spool by rotating a winding knob to wind a filmed film into a cartridge, wherein the drive shaft is rotated with respect to a center of rotation of the spool. The film unit with lens is characterized in that the center of rotation of the is eccentric to the back side. 2. The engaging portion is a plurality of inner teeth formed on an inner wall of a shaft hole at an upper end of the spool, and the drive shaft has an outer tooth fitted on the shaft hole and meshing with the inner tooth on an outer circumference. The lens-fitted film unit according to claim 1, wherein the inner teeth and the outer teeth are partially meshed on the back side.