JPH0643593A - Film unit with lens - Google Patents

Abstract

PURPOSE:To take pictures of more than a prescribed number by a compact unit body and to prevent its internal film from being flawed by rubbing or from forming naturally curing habit. CONSTITUTION:The internal diameter L1 of a cartridge body 19a put in the unit body is set to 17-19mm, and the external diameter L2 of a cartridge shaft 19b incorporated in the cartridge body 19a is set to 8-10.5mm; and the internal diameter L3 of a film chamber 22 for storing the film 21 led out of the cartridge body 19a is set to 15.4-17.5mm, and the external diameter L4 of a winding shaft provided in the film chamber 22 is set to 6-10mm.

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 having a photo film built therein in advance.

[0002]

2. Description of the Related Art A lens-fitted film unit manufactured and sold by the applicant of the present invention [Sharp Run Hi (trade name)]
As disclosed in, for example, Japanese Patent Publication No. 2-32615, an unexposed film is built in advance in a unit main body having a simple photographing mechanism, and the film exposed for each photographing is stored in the international standard Patrone main body. I have been involved in. In this lens-fitted film unit, a normal 35 mm film of international standard is used as the film.
This film is set with two front frames and one rear frame as spare frames. With this lens-equipped film unit, the unexposed film is loaded in the dark room of the factory, and the exposed film is taken out at the photo lab. You can take a picture. In this way, a film unit with a lens that can take 3 frames more than the specified number has been released as "Shaken Run Econoshot (product name)".

A lens-fitted film unit that incorporates the international standard 24-shot film and has 27-shot film is 7 mm wider than the same type of the conventional lens-fitted film unit in order to improve portability. 5mm in thickness
It has been miniaturized. When the lens-fitted photo film unit is further miniaturized, it is necessary to reduce the film storage space, for example, the film cartridge main body or the film chamber for storing the film drawn from the film cartridge. For this reason, it has been proposed that the cartridge body be replaced with a slender one, that the inside diameter of the film chamber be reduced, and that the film be wound around a winding shaft and stored.

[0004]

By the way, the inside diameters of the cartridge body and the film chamber are small in order to accommodate the cartridge shaft and the film roll wound around the winding shaft, in order to make them smaller. It is necessary to reduce the outer diameter of the winding shaft. However, when the outer diameters of the cartridge shaft and the winding shaft are reduced, the film has a strong curl tendency, which causes a problem during development processing. Further, when the outer diameter of the cartridge shaft and the winding shaft is thicker than the inner diameter of the cartridge body or the film chamber, the film surface rubs against the inner wall of the cartridge body or the film chamber at the time of feeding the film, which causes scratches. Occurs.

The present invention has been made in consideration of the above problems, and it is possible to take a predetermined number or more of images by using spare frames and prevent the film from being curled or scratched. An object of the present invention is to provide a compact film unit with a lens.

[0006]

In order to achieve the above object, in the lens-fitted film unit of the present invention, the inside diameter of the cartridge main body incorporated in the unit main body is 17 mm to
The outer diameter of the patrone shaft provided in the patrone body is set to 19 mm, and the inner diameter of the film chamber for accommodating the film drawn out from the patrone body is set to 15.4 mm to 17.5 mm. The outer diameter of the winding shaft provided in this film chamber is 6 mm to 10 mm.
I am trying.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 3 shows a film unit with a lens embodying the present invention. The lens-fitted film unit 2 is composed of a unit body 3 in which an unexposed film is incorporated, and an exterior body 4 for packaging the unit body 3. The unit main body 3 is provided with a taking lens 5, a finder 6, a release button 7, a remaining number of frames to be photographed display 8 and a winding knob 9. Since the exterior body 4 is formed with an opening for exposing the taking lens 5 and the like, the lens-fitted film unit 2 can photograph without taking out the unit body 3 from the exterior body 4.

In the lens-fitted film unit 2, the unexposed film is loaded in the dark room of the factory, and the exposed film is taken out in the developing room. For this reason, when the film is loaded, for example, the unexposed film is pulled out from the cartridge to the full extent, and during the developing process, the amount of the film leader portion pulled out from the cartridge is kept within a predetermined range so that the film can be used efficiently. A film unit with a lens that uses an international standard film that has two spare frames on the film reader side and one spare frame on the Patrone axis side can shoot three frames more than the specified number. .

FIG. 2 shows the inside of the unit body. The unit main body 3 is composed of a main body portion 15, a front cover 16 and a rear cover 17 which are mounted in front of and behind the main body portion 15.
An exposure chamber 18 is provided at the center of the main body 15, and a cartridge chamber 20 for accommodating a cartridge 19 at both ends, and a film chamber 22 for accommodating an international standard 24-shot film 21 drawn from the cartridge 19 are provided. Each is formed.

In this lens-fitted film unit 2,
In order to make the unit main body 3 compact and to improve portability, a thin one is used as the patrone 19,
The inside diameter of the film chamber 22 is reduced. By the way, in this patrone 19, in order to store the film 21 inside without curling habits or scratches,
As shown in, the inside diameter L1 of the cartridge main body 19a is 18 mm.
And the outer diameter L2 of the cartridge shaft 19b is 9 mm
I have to.

When the inner diameter L3 of the film chamber 22 is reduced to 16.4 mm, the film roll 21a accommodated in the film chamber 22 is crushed and distorted, and the winding torque of the film 21 increases. In order to solve this problem, in the lens-fitted photo film unit 2, the film 21 is wound around a winding shaft 23 having an outer diameter L4 of 8 mm so that the film 21 does not have a strong curl habit and the film roll 21a is It is designed to be maintained in a perfect circle. Further, on the front surface of the exposure chamber 18,
The exposure opening 25 is formed, and the exposure opening 25 is formed.
A holding plate 28 that holds the shutter mechanism 26 and the taking lens 5 and has a diaphragm opening 27 is disposed on the front surface of the.

The operation of the lens-fitted film unit 2 thus constructed will be described. In the dark room of the factory, the film 21 is pulled out from the cartridge main body 19a while being wound around the winding shaft 23. In this state, the winding shaft 23 around which the cartridge main body 19a and the film 21 are wound is loaded in the cartridge chamber 20 and the film chamber 22, respectively. At this time, since the film roll 21a is wound and narrowed by the winding shaft 23, the outer peripheral surface thereof does not rub against the inner wall of the film chamber 22. After the film loading is completed in this way, the rear cover 17 is attached to the main body portion 15 and further wrapped with the exterior body 4, whereby the lens-fitted film unit 2 is completed.

In the lens-fitted film unit 2, since the start mark "S" is displayed on the number-of-images-remaining-images display plate 8 immediately after purchase, the user turns the winding knob 9 on.
To wind the film. When the winding knob 9 is operated, the cartridge shaft 19b is rotated counterclockwise in FIG. 3, and the film 21 is pulled in the arrow direction in the drawing. When the film 21 is pulled in the arrow direction,
The film roll 21a is wound and squeezed so that its outer diameter becomes smaller and the outer circumference becomes a perfect circle. For this reason, the film roll 21a rotates counterclockwise together with the winding shaft 23 without the outer peripheral surface of the film roll 21a being strongly rubbed against the inner wall of the film chamber 22. Therefore, the film 21 is not scratched.

When a small amount of the film 21 is wound up in this way, a winding stop mechanism (not shown) is activated to prevent the winding knob 9 from rotating. During this period, the number of remaining frames to be photographed 8 rotates, and a number indicating the remaining number of films, for example, "27" is displayed from the counter window. The remaining number of films is a number that is three more than the number of 24 determined by the international standard, and indicates that three extra film units 2 with this lens can be taken.

When all the frames of the film 21 are photographed, one extra frame on the side of the cartridge shaft 19b and two extra frames on the side of the film reader are additionally photographed. After that, when the user operates the winding knob 9 until the user observes the end mark "E" on the remaining number-of-photos display plate 8, the film 21 is stored in the cartridge main body 19a up to the tip thereof. At this time, the Patrone shaft 19b
Although the film 21 wound around is thick, the outer peripheral surface thereof is not strongly rubbed against the inner wall of the cartridge main body 19a.

When the user takes the lens-fitted film unit 2 together with the DPE to a development shop, the DPE is further sent to the developing station. Here, the exterior body 4 and part of the unit main body 3 are opened, and the cartridge 19 accommodating the exposed film 21 is taken out. The cartridge 19 is applied to a bellows ejector, and is withdrawn by such a length that the spare frame on the side of the film leader is not exposed to light, and is set in an automatic processor to perform a predetermined developing process.
As a result, it is possible to shoot 27 frames, which is 3 frames more than the specified number, on the film 21.

In the above embodiment, L1, L2, L3
L4 length is 18mm, 9mm, 16.4mm, 8mm respectively
However, the length of L1 is in the range of 17 mm to 19 mm, the length of L2 is in the range of 8 mm to 10.5 mm, and the length of L3 is 15.4.
By setting the range of mm to 17.5 mm and the length of L2 in the range of 6 mm to 10 mm, it is possible to obtain the same effect as that of the above embodiment.

[0018]

As described above in detail, according to the lens-fitted photo film unit of the present invention, the inside diameter of the cartridge main body incorporated in the unit main body is 17 mm to 19 mm and the inside diameter of the film chamber is 15.4 mm to. 17.5
Since it is mm, the unit body can be downsized. Further, the outer diameter of the cartridge shaft is set to 8 mm to 10.5 mm, and the film drawn from the cartridge has an outer diameter of 6 mm.
Since the film is wound around the winding shaft of 10 mm to 10 mm and stored in the film chamber, when the outer diameter of the cartridge shaft or the film roll wound around the winding shaft is maximized, the outer peripheral surface of the cartridge is the main body. It is possible to store an international standard 24-shot film without being rubbed against the inner wall of the film or the inner wall of the film chamber. Also, it is possible to prevent the film from having a strong curl habit.

Further, by utilizing the system advantage that the unexposed film is loaded in the dark room of the factory and the exposed film is taken out at the developing station, if the above-mentioned film is efficiently used, the number of film is 3 or more than the specified number. You can shoot 27 extra frames.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a unit main body.

FIG. 2 is a diagram showing the inside of a unit main body.

FIG. 3 is a perspective view showing the outer appearance of a lens-fitted film unit.

[Explanation of symbols]

 2 Film unit with lens 3 Unit body 5 Photographic lens 19 Patrone 19a Patrone body 19b Patrone shaft 20 Patrone chamber 21 Film 22 Film chamber 23 Rolling shaft

Claims (1)

[Claims] 1. A unit body incorporating a simple photographing mechanism, a cartridge chamber formed in the unit body for accommodating a cartridge body having a cartridge shaft incorporated therein, and an unexposed film drawn from the cartridge body wound on a winding shaft. In the film unit with a lens, which is provided with a film chamber for attaching and storing the film, the patrone shaft is rotated through a winding mechanism for each photographing, and the exposed film is sequentially wound into the patrone main body. Is 17 mm to 19 mm, and the outer diameter of the patrone shaft is 8 mm to 10.5 mm,
Further, the film unit with a lens is characterized in that the film chamber has an inner diameter of 15.4 mm to 17.5 mm and an outer diameter of the winding shaft is 6 mm to 10 mm.