JPH05333478A - Film unit with lens - Google Patents

Abstract

PURPOSE:To disable a film unit with a lens to be used again by using a film on a market or the like and to prevent misphotographing caused by the reloading of the film or the use of the film unit over a recycling limit by constituting the number of teeth of a sprocket by the specified number. CONSTITUTION:The follower sprocket 34 is constituted of nine teeth by increasing the number of teeth by one in comparison with a sprocket (the number of teeth is eight) for a normal 135 type film. In accordance with it, the pitch of the perforations 23a of the film 23 is formed smaller than that of the 135 type film. Since the perforations 23a of the film 23 are formed at the special pitch, the film 23 is dedicated for this film unit. Therefore, even when the general 135 type film on a market is loaded, it is not engaged because the teeth 34a of the sprocket 34 are not aligned with the pitch of the perforations 23a.

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 having a built-in film and a photographing lens and a shutter mechanism.

[0002]

[Prior Art] "Snap Shots High", "Snap Shots Flash", "Snap Shots Panorama" (All are product names)
The lens-fitted film unit such as is generally widely used because it is possible to take a picture immediately on the spot when it is purchased, and it is easy to take it to a store dealing with development after shooting. At the photo lab, the film that has been photographed is taken out from the lens-fitted film unit, and the film is developed and printed, and the user receives the printed photo and the negative film. From such a use form, the lens-fitted film unit is required to be low in cost, and in order to meet this, mass production by automatic assembly is performed.

[0003]

The lens-fitted film unit is constructed by integrating the camera part including the lens and the film, each of which is established by a unique system. Therefore, when the photographed film is taken out from the photographed lens-fitted film unit, and a commercially available ordinary film is loaded and reused, it is necessary to reassemble the film with a dedicated assembly line. This is because if a dedicated reassembly line is not used, the assembly cannot be completed completely, which may result in a blurred image, for example, and the initial performance cannot be guaranteed. Also, personal reloading of the film may cause it to be used many times over the recycling limit.
Similarly, the initial performance cannot be guaranteed.

The present invention is intended to solve the above-mentioned problems and makes it impossible to reuse a commercially available film or the like, thereby eliminating photographing mistakes due to film reloading and use beyond the recycling limit. It is an object of the present invention to provide a lens-fitted film unit that is capable of performing the above.

[0005]

In order to achieve the above object, the present invention provides a sprocket having a reference circumferential length of 3 mm.
When the thickness is 8 mm, the number of teeth is 7 or 9, and the perforations of the film are formed at a pitch corresponding to the sprocket.

According to the second aspect of the invention, the perforations are formed only on the side that meshes with the sprocket,
The width of the film is narrower than that of the 135 type film, and the film passage is formed to have a width that matches the width of the film.

According to the third aspect of the invention, both side edges of the film located outside the perforations are cut off to make the width narrower than the 135 type film, and the film passage is adjusted to the width of the film. It is composed of width.

According to the present invention, the width of the film is narrower than that of the 135 type film as the width for the panorama size frame, and the film passage is formed to have a width corresponding to the width of the film. ..

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 2 shows a film unit with a lens (hereinafter, simply referred to as a film unit) embodying the present invention. The film unit 2 is composed of a unit main body 3 having a photographing mechanism and an outer case 4 for accommodating the same, and a photograph is taken with the outer case 4 left in the case. The outer case 4 is for making the external appearance of the film unit 2 beautiful, and uses a paper box whose outer surface is printed. In the outer case 4, a photographing lens 5, an objective side finder window 6a, an eyepiece side finder window 6b, a shutter button 7, a photographing number display plate 8, a winding knob 9,
Also, a hole for exposing the strobe light emitting section 10 is provided. Although the outer case 4 described above is a paper box,
It may be a plastic sheet or the like.

FIG. 3 shows the unit body 3. The unit body 3 includes a body portion 20, a front cover 21, and a rear cover 22. A shutter unit 25 having the taking lens 5 arranged on the front surface of the main body 20.
And a strobe unit 26 that holds the light emitting unit 10. As shown in FIG. 4, the film chamber 20a and the exposure chamber 20 are provided on the back side of the main body 20 from the left side in the figure.
b and the cartridge chamber 20c are formed, and the film 23 with the cartridge 24 is loaded on the back surface side of the main body portion 20. In this state, the rear cover 22 is detachably attached to the main body portion 20 by the claw. The rear cover 22 is provided with a bottom lid 12 that can be opened and closed to take out the cartridge 24 in which the film 23 is wound after the photographing is completed.

As shown in FIG. 5, the shutter unit 25 is detachably attached to the front surface of the main body 20 by means of a positioning hole 39 and claw receiving portions 40a and 40b. A shutter blade 32 is rotatably and axially fixed to a position where the opening 28 of the shutter unit base portion 29 is closed, and the photographing lens 5 is held on the shutter unit base portion 29 so that the shutter blade 32 does not fall off. A shutter cover 37 is attached. The shutter blade 32 is biased counterclockwise by a spring 36 and is stopped at a position where it blocks the opening 28.

Shafts 40c and 40d and a bearing 40e are formed on the shutter unit base 29. The shaft 40c is provided with a photographing number display plate 8 and a shutter drive cam 31 having a shutter drive lever 31a. The shaft 40d is rotatably screwed with a locking lever 30 which is urged clockwise by a spring 35. Has been done. The locking lever 30 normally engages with a shutter drive lever 31a biased counterclockwise by a spring 35 to prevent the shutter drive cam 31 from rotating, and when the shutter button 7 is pressed, The engagement with the shutter drive lever 31 is released. When the shutter drive lever 31a is released from the engagement with the locking lever 30, the shutter drive lever 31a is rotated counterclockwise by the spring 35, and the arcuate pressing surface 31b formed on the shutter drive lever 31a is clawed on the shutter blade 32. The portion 32a is pressed.

A sprocket shaft portion 49 which is a shaft of a cam 33 which engages with the locking lever 30 is inserted through the bearing 40e. When the film is wound on the shaft 49,
A driven sprocket 34 that meshes with the perforations 23a of the film 23 and is rotated clockwise is fitted. Therefore, when the film winding knob 9 is rotated to wind the film 23, the sprocket 3
4 rotates in the counterclockwise direction, whereby the cam 33 also rotates in the counterclockwise direction, the shutter drive lever 31a returns to the initial position via the cam arm 31c formed on the shutter drive cam 31, and The number-of-photographed display plate 8 is rotated by one scale.

As shown in FIG. 1, the sprocket 34 is
The sprocket for a general 135 type film (having 8 teeth) is increased in number by 1 to be 9 in number. The tooth width and tooth thickness are configured to be substantially the same as those of the 135 type. That is, there are nine teeth 34a for the circumference length of 38 mm of the reference circle P1 and the commercially available 13
One type 5 film is formed, while eight types are used for the reference circumference length of 38 mm. Corresponding to this, the pitch of the perforations 23a of the film 23 is (38 /
9 = 4.22) mm, which is smaller than that of the 135 type film.

As described above, since the film 23 has the perforations 23a formed with a unique pitch, it is a film dedicated to this film unit. Therefore, even if a commercially available general 135 type film is loaded, the teeth 34a of the sprocket 34 and the perforations do not match in pitch, and they do not mesh with each other. This makes reloading of the 135 type film impossible. However, since the width of the film is the same as that of the 135 type film, it is possible to use this special film 23 with a conventional film processor or the like dedicated to the 135 type film. It can be developed. Further, even in the printer processor, if the film is fed by nipping roller pairs that do not rely on perforation, the print processing can be performed in the same manner.

The operation of the lens-fitted film unit thus configured will be described. When the shutter button 7 is pressed, the locking lever 30 is pressed in conjunction with this. As a result, the locking lever 30 moves, and the shutter drive lever 31 disengaged by this movement.
The spring a is rotated counterclockwise from the initial position by the spring 35. The pressing surface 31b engages with the pawl portion 32a and presses the pawl portion 32a, so that the shutter blade 32 is momentarily rotated. As a result, the claw portion 32a is pressed to the right, so that the shutter blade 32 is rotated clockwise and the exposure opening 28 is opened. After that, when the shutter blade 32 is further rotated clockwise, the pressing surface 32b is disengaged from the claw portion 32a. As a result, the shutter blade 32 is rotated counterclockwise by the spring 36, returns to the position where the exposure opening 28 is closed, and the photographing ends. The rotation of the shutter drive lever 31a is stopped when the cam arm 31c contacts the cam 33.

After the photographing, the winding knob 9 is rotated,
When the film 23 is wound around the cartridge 24, the driven sprocket 34 is rotated counterclockwise via the perforations 23a. As a result, the cam 33 moves the spring 3
The shutter drive lever 31a is rotated counterclockwise against the urging force of 5, and the shutter drive lever 31a is rotated clockwise. If the shutter drive lever 31a comes into contact with the claw portion 32a during this rotation, the shutter drive lever 31a is deformed upward and gets over this. Then, when the shutter drive lever 31a returns to the initial position and the shutter charge is performed, the next shooting preparation is completed.

When the film unit 2 is submitted to the developing station after the photographing is completed, the bottom cover 12 is opened at the developing station, the cartridge 24 on which the photographed film 23 is wound is taken out, and the DP processing is performed. In addition, even if the user takes out the photographed patrone 24 from the patrone storage portion 20c and tries to reload the normal 135 type film, the pitch is different from the teeth 34a of the sprocket 34 and the perforation of the commercially available 135 type film.
Since the tooth 34a is smaller, the perforation and tooth 3
4a does not mesh with each other. Therefore, even if the film is fed by turning the winding knob 9, the sprocket 34
Since it does not rotate, it cannot be used because the shutter is not charged. For this reason, personal reloading of the film is prevented, and it is possible to prevent the mistaken loading of the film and the reuse of the shutter unit and the like beyond the recycling limit, and the occurrence of shooting errors and the like due to these. Disappear.

In the above embodiment, the number of teeth of the sprocket is 9 out of 8 of the 135 type film. However, the number of teeth is not limited to this, and as shown in FIG. 6, for example. Alternatively, a sprocket 51 having seven teeth 50 may be used. Further, a sprocket having 6, 10, 11, etc. teeth may be used.

In addition to changing the perforation pitch, as shown in FIG. 7, only the upper perforation 55 that meshes with the sprocket is formed, and the lower perforation forming portion (hatched portion in the drawing) 5
Narrow width film 57, which was lost like 6
May be used. In this case, the pitch of the perforations 55 is the same as that of a commercially available 135 type film. The film passage of the film unit is made narrower than that of the 135 type film by making it correspond to the width of the film 57. As a result, after removing the photographed film, the commercially available 135
Even if an attempt is made to load a type film, the width of the film does not match the width of the film passage of the film unit, and the loading becomes impossible.

Further, as shown in FIG. 8, both side edges (hatched portions in the figure) 61 of the 135 type film are set to 1.
You may make it use the narrow film 62 of the shape cut off by 5 mm width. In this case, as shown in FIG. 9, the width W of the film passage 63 of the film unit is formed to have the same width as the width W of the film 62.
Even if an attempt is made to reload the commercially available 135 type film 60, the width of the film does not match and the reloading is impossible.

When the film unit is dedicated to the panorama size such as "Sharpness Run Panorama", as shown in FIG. 10, the width of the film 70 corresponds to the width of the panorama size frame PF. If the width of the film unit 70 is reduced to 8 mm and the width of the film passage of the film unit 70 is correspondingly reduced, the 135 type film 70 cannot be reloaded in the same manner.

[0023]

As described above, according to the present invention,
The film perforation pitch and film width are different from those of the commercially available 135 type film, and the film passage width of the film unit and the number of teeth on the sprocket are configured to match the special film. Even if an attempt is made to reload the commercially available 135 type film after taking out the film having been photographed, it cannot be reloaded because the perforations and widths do not match. Further, since a film for exclusive use of the lens-fitted film unit in which the pitch and width of the perforations are changed is not commercially available, a normal user cannot obtain it. Therefore, it is possible to prevent the film from being reloaded into the film unit. As a result, it is possible to prevent photographing failure due to defective assembly, film loading error, etc., and reuse of the shutter unit or the like beyond the recycling limit. Therefore, the reloading is performed only in the dedicated assembly line, and the reloading can be performed in a state where the initial performance can be guaranteed.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an engaged state of a sprocket and a perforation of a film of a lens-fitted film unit embodying the present invention.

FIG. 2 is a perspective view showing an appearance of a lens-fitted film unit.

FIG. 3 is a perspective view showing an exploded unit main body.

FIG. 4 is a perspective view of the main body seen from the back.

FIG. 5 is an exploded perspective view of a shutter unit.

FIG. 6 is a perspective view showing a sprocket according to another embodiment.

FIG. 7 is a plan view showing a film according to another embodiment.

FIG. 8 is a plan view showing a film according to another embodiment.

9 is a cross-sectional view showing a film passage of a film unit using the film of FIG.

FIG. 10 is a plan view showing a film according to another embodiment.

[Explanation of reference numerals] 23, 57, 62, 70 film 23a perforation 34, 51 driven sprocket 34a, 50 teeth 63 film passage

Claims (4)

[Claims] 1. A lens-fitted film unit having a built-in film in advance and having a photographing mechanism such as a photographing lens, a shutter mechanism, and a film feeding mechanism having a sprocket meshing with perforations of the film, wherein the sprocket has a reference circle. Circumference of 38
A film unit with a lens, characterized in that when it is set to mm, the number of teeth is set to 7 or 9 and the perforations of the film are formed at a pitch corresponding to the sprocket. 2. A lens-fitted film unit having a built-in film in advance and having a photographing mechanism such as a photographing lens, a shutter mechanism, and a film feed mechanism having a sprocket meshing with the perforation of the film, on the side where the perforation meshes with the sprocket. The lens-fitted film unit is characterized in that the film width is narrower than that of the 135 type film and the film passage has a width adapted to the width of the film. 3. A lens-fitted film unit having a film built-in in advance and having a photographing mechanism such as a photographing lens, a shutter mechanism, and a film feeding mechanism having a sprocket that meshes with the perforation of the film, located outside the perforation. The lens-fitted film unit is characterized in that both side edges of the film are cut off to make the width narrower than that of the 135 type film, and the film passage has a width adapted to the width of the film. 4. A lens-fitted film unit having a built-in film in advance, and incorporating a photographing lens, a shutter mechanism, a film feeding mechanism having a sprocket meshing with perforations of the film, a photographing mechanism such as a photographing frame for panoramic size, A film unit with a lens, characterized in that the width of the film is narrower than that of a 135 type film as a width for a panorama size frame, and the film passage has a width matched with the width of the film.