JPH1090775A - Film unit with lens - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a film unit with a lens in which a photographic film cartridge having a light shielding cover which is freely opened and closed at a film gateway is incorporated, which is compact and light in weight and which can be inexpensively manufactured. SOLUTION: A driving shaft 31 is constituted of a circular shaft part 31a inserted in the engagement part 8 of the light shielding cover 7 and a projecting part 31b projecting from the shaft part 31a. When a turning member is turned in the direction of a closing position, the cover 7 is turned to the closing position. The projecting part 31b of the shaft 31 is shaped so that the cover 7 is locked by the lock pin 9 of a cartridge main body at the closing position without releasing an engagement state between the pin 9 and the level difference part 8b of the cover 7 when the cover 7 is turned to the closing position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film unit with a lens having a built-in photographic film cartridge having a light-shielding cover which can be opened and closed at a film entrance.

[0002]

2. Description of the Related Art Proposed in this technical field, for example, a magazine "Photo Industry" (published by Photo Industry Co., Ltd., March 1995)
p. 27) Wrap the photo film in the cartridge body to the rear end as described in (27), and open the film door to open the film door instead of sticking the conventional telemp (densely planted ribbon) to shield the film door. 2. Description of the Related Art A photographic film cartridge using a plastic light-shielding lid that is rotatable between a film opening and closing position and a light-shielding position in which light is blocked is known. Such a scheme is called "Adva
called the "nced Photo System".

At the end of the light-shielding lid of such a photographic film cartridge, a notch-shaped engaging portion exposed from the end surface of the photographic film cartridge is provided, and this engaging portion is incorporated in a camera or the like. When the drive shaft is engaged and rotated, the light-shielding lid is opened and closed.

In the above-described photographic film cartridge, if the light-shielding lid is inadvertently rotated from the closed position to the open position, particularly when the photographic film wound inside is in a state before the development, the photographic film becomes unusable. There is a risk of exposure. In order to prevent accidents such as accidentally turning the light-shielding lid from the closed position to the open position, a photo film cartridge compatible with the “Advanced Photo System” has a light-shielding lid 52 as shown in FIG. When in the closed position, an elastic lock pin 54 integrally projecting from the cartridge body engages with a step 53a formed in the engaging portion 53 of the light-shielding lid 52 (position b in the figure), and 52 is configured to prevent careless rotation in the opening position direction.

When the film is developed or when the film is sent out in the camera, the drive shaft 55 of the light-shielding lid opening / closing device for rotating the light-shielding lid 52 is provided with a notch-shaped engaging portion 5.
No. 3 is inserted. At this time, the drive shaft 5
As shown in FIG. 7, as shown in FIG. 7, the drive pin 55 is inserted into the engagement portion 53 because the lock pin 54 of the cartridge body is curved (position a in the drawing) so as to be disengaged from the step 53 a. Then, the light-shielding lid 52 and the lock pin 5
4 is released, and the rotation of the drive shaft 55 allows the light-shielding lid 52 to rotate to the open position.

The photographic film cartridge of the "Advanced Photo System" is smaller and lighter than a conventional 135 photographic film cartridge, and so on.
It has been proposed to use it not only for a camera but also for a film unit with a lens which requires further reduction in thickness and weight.

As described above, when a photographic film cartridge of "Advanced Photo System" is used for a photographic film unit with a lens, the photographic film unit in the photographic film cartridge is pulled out in advance, and each time a photograph is taken, a photographic film is taken out. Since the film is wound into the film cartridge, the light shielding cover only needs to be able to rotate in one direction to the closed position when the photographic film cartridge is taken out.

When the light-shielding lid is in the closed position, the drive shaft that engages with the engaging portion of the light-shielding lid and rotates the light-shielding lid curves the lock pin so as to be disengaged from the step. It is not necessary, and the photographic film cartridge is taken out of the cartridge chamber after the light-shielding lid is closed, so that there is no problem even if the light-shielding lid is locked in the closed position by the lock pin.

[0009]

The drive shaft of the closing device for rotating the light shielding cover to the closed position when the photographic film cartridge is taken out of the cartridge chamber of the film unit with the lens as described above is used in a camera. When the lock pin of the cartridge body is disengaged from the light-shielding lid at the closed position of the light-shielding lid, as in the conventional drive shaft of the light-shielding lid opening / closing device, the diameter of the drive shaft increases, Accordingly, the size of the closing device for the light-shielding lid also increases, which hinders the size and weight of the film unit with the lens.

As described above, in the film unit with a lens, when the photographic film cartridge is taken out of the cartridge chamber, the lock pin of the cartridge body is disengaged from the light shielding cover at the closed position of the light shielding cover. There is no need to keep the function at all, and having unnecessary functions leads to an increase in manufacturing cost.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and provides a small, lightweight, low-cost film unit with a lens in which a photographic film cartridge having a light-shielding cover which can be opened and closed at a film entrance is incorporated. The purpose is to do.

[0012]

In order to solve the above-mentioned problems, in a film unit with a lens according to the present invention, a light-shielding lid is mounted on a drive shaft of a light-shielding lid closing device for rotating a light-shielding lid from an open position to a closed position. And a projecting portion that contacts at least a part of the notch provided in the engaging portion, and the length of the rotation center and the projecting portion of the drive shaft is equal to or shorter than the length of the rotation center and the lock pin. It is like that.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a film unit with a lens embodying the present invention will be described below. First, the configuration of the photographic film cartridge of the "AdvancedPhoto System" built in the lens-fitted film unit of the present invention will be described. As shown in FIG. 2, the photographic film cartridge 2 includes a photographic film 3 and a cartridge body 4 for storing the photographic film 3 in a light-tight manner. The cartridge body 4 is composed of an upper case 4a and a lower case 4b which are formed of a light-shielding resin and are engaged with each other. At the center of the cartridge body 4, a spool 5 to which one end of the photo film 3 is locked is rotatably mounted on a shaft.

At one end of the cartridge body 4, a film entrance 6 through which the photographic film 3 enters and exits is provided. A light-shielding cover 7 for keeping the inside of the cartridge body 4 light-tight is rotatably mounted on the film entrance 6 between a closed position for closing the film entrance 6 and an open position for opening the film entrance 6. As shown in FIG. 3, an engaging portion 8 having a notch 8 a is integrally provided at an end of the light shielding cover 7.

A drive shaft 31 of a light-shielding lid closing device 30, which will be described in detail later, is engaged with the engaging portion 8 of the light-shielding lid 7. The rotation of the drive shaft 31 opens the light-shielding lid 7 (see FIG. 4).
(A)) and the closed position (FIG. 4B).
In addition, as shown in FIG. 4B, when the light-shielding lid 7 is in the closed position, the cartridge body 4 engages with the step portion 8b provided in a part of the engaging portion 8 near the film entrance 6. The lock pin 9 locks the light-shielding lid 7 in the closed position by preventing the light-shielding lid 7 from rotating toward the open position.
Are provided integrally with the upper case 4a.

The photographic film 3 is provided with two perforations 3 a for each photographing frame, and one end of the photographic film 3 is engaged with the spool 5. With such a configuration, the photo film 3 is wound around the spool 5 and stored in the cartridge body 4, and the film entrance 6 is closed by the light blocking cover 7 by setting the light blocking cover 7 to the closed position. Are kept light tight. Also,
The lock pin 9 engages with the step 8b of the light-shielding lid 7, and the light-shielding lid 7 is locked in the closed position.

The photo film 3 is fed out of the cartridge main body 4 from the film entrance 6 by rotating the light blocking cover 7 to the open position to open the film entrance 6 and rotating the spool 5. In order to rotate the light shielding cover 7 from the closed position to the open position, the lock pin 9 is used.
Is inserted into the engaging portion 8, and a turning shaft is rotated in the opening position direction.

In the case of a film unit with a lens, the photographic film 3 which has been completely pulled out is wound up into the cartridge body 4 through the film entrance 6 and
Since the photo film cartridge is taken out after the whole amount is wound up, the photo film 3 is not fed out from the film entrance 6.

Next, the construction of the film unit with a lens according to the present invention in which the above-described photographic film cartridge is built will be described. FIG. 5 is an external perspective view of a lens-fitted film unit of the present invention, and FIG. 6 is an exploded perspective view of a main body of the unit. The lens-fitted film unit 11 is composed of a unit main body 12 in which the photographic film cartridge 2 is pre-loaded and various photographing mechanisms are incorporated, and an exterior paper 13 partially covering the unit main body 12.

On the upper surface of the unit body 12, an integrally formed shutter button 14 and a photographing number display window 15 are provided. On the front surface, a finder 16, a photographing lens 17, a strobe charging switch 18, a strobe light emitting section 19 and the like are provided. The exterior paper 13 is coated with an adhesive on the back surface and affixed so as to be wound around the central portion of the unit main body 12, and has an opening for exposing the photographing lens 17, the finder 16, the photograph number display window 15, and the like to the outside. I have.

The unit main body 12 has a front cover 21 forming the front side of the unit main body 12, a rear cover 22 forming the rear side, and a main body base 23 (which is accommodated between the front cover 21 and the rear cover 22). 6), and a well-known exposure unit (not shown) and a strobe unit (not shown) assembled on the front side of the main body base 23.

Although not shown, the exposure unit includes a shutter charging mechanism, a film winding mechanism, a counter feed mechanism, a shutter driving mechanism, a shutter blade, a photographing lens 17 and the like, as well as a conventional lens-equipped film unit. Are unitized with the objective lens and the eyepiece. The strobe unit includes a printed circuit board (not shown) provided with a strobe circuit, and a strobe light emitting unit 19 attached to the strobe circuit. Strobe charging is performed by pressing a strobe charge switch 18 provided on the front cover 21. Flash emission is performed in synchronization with the shutter release.

As shown in FIG. 6, an aperture 24 for shielding the photographing optical path from the exposure unit mounted on the front side to the photographic film 3 is provided at the center of the main body base 23.
Is provided. On both sides of the aperture 24, a cartridge chamber 25 and a film roll chamber 26 for accommodating the cartridge body 6 and the film roll 3b in which the photo film 3 is wound in a roll at the manufacturing stage are integrally formed. .

The inside of the cartridge chamber 25 and the film roll chamber 26 are located on the rear side of
2 is assembled, and the bottom cover 22a for the cartridge chamber (see FIG. 5) formed integrally with the rear cover 22 and the bottom cover (not shown) for the film roll chamber are closed, so that the inside is lighted. Closely maintained. The bottom cover 22a is connected to the rear cover 22 via a bendable thin portion, and is opened when the photographic film cartridge 2 is taken out of the used film unit 11 with lens.

A winding dial 27 is rotatably mounted on the upper surface 25a of the cartridge chamber 25, and a winding shaft 28 integrally provided on the lower surface thereof engages with the engaging hole 5a of the spool 5 of the photographic film cartridge 2. It has become. The winding dial 27 is rotated in the counterclockwise direction in the drawing every time one frame is shot by pressing the shutter button 14, and by rotating the spool 5 until the winding dial 27 is locked, one frame of the photographic film 3 is rotated. Is caught in the cartridge body 4.

The two-tooth sprocket of the exposure unit engaged with the perforation 3a is rotated by winding up the photographic film 3 for one frame. The exposure unit uses the rotating power of this two-tooth sprocket,
The film is stopped, the shutter is charged, and the display of the number of shots is updated. By repeating the photographing by pressing the shutter button 14 and the rotating operation of the winding dial 27, the photographing is sequentially performed from the rear end side (the side locked to the spool 5) of the photographic film 3 toward the front end side. Done.

On the upper surface 25a of the cartridge chamber, in addition to the hoisting dial 27, a driving shaft 31 constituting the light shielding cover closing device 30, a rotating member 32 as a driving mechanism, and a spring 33 are assembled. The rotating member 32 is inserted into the opening 34 and is engaged with the engaging portion 8 of the light shielding cover 7, and is integrally formed on the upper portion of the driving shaft 31 and is disposed on the upper surface 25 a of the cartridge chamber 25. And a spring holding portion 37 to which the spring 33 is attached.

The spring 33 biases the rotating member 32 in the counterclockwise direction in the figure (the closing direction of the light shielding cover 7).
The light-blocking lid 7 is rotated to the closed position by the rotation of the rotation member 32 in the counterclockwise direction by the bias of 3.

The rotating member 32 is held at the open position of the light shielding cover 7 against the bias of the spring 33, and the drive shaft 31 is engaged with the engaging portion 8 of the light shielding cover 7 at the open position. . And
When the photographic film cartridge 2 is taken out after the use of the lens-fitted film unit 11, the holding of the rotating member 32 is released to rotate the light shielding cover 7 in the closing direction of the light shielding cover 7 by the bias of the spring 33, and Light-shield lid 7 engaged
Is also rotated to the closed position. As described above, while holding the rotating member 32 at the open position of the light shielding cover 7 and releasing the holding of the rotating member 32 when the photo film cartridge 2 is taken out, the position between the cartridge chamber 25 and the aperture 24 is reduced. It is a rod-shaped connecting member 38 that is slidably assembled in the vertical direction.

The connecting member 38 is held by a claw member in a guide groove 39 formed between the cartridge chamber 25 and the aperture 24 with the upper end 38a protruding from the upper surface 25a of the cartridge chamber. Then, the locking member 36 of the rotating member 32 is pressed by the upper end portion 38 a against the bias of the spring 33, thereby holding the rotating member 32 at the open position of the light shielding cover 7.

The coupling member 38 holding the rotating member 32 has a claw member (not shown) in which an engagement claw 38b formed at the lower end is formed integrally with the bottom lid 22a that covers the bottom surface of the cartridge chamber 25. ). Then, when the bottom cover 22a is opened to take out the photographic film cartridge 2 after using the film unit 11 with a lens, the connecting member 38 locked by the claw member of the bottom cover 22a is slid downward. As a result, the upper end 38a of the connecting member 38 is moved below the upper surface 25a of the cartridge chamber.
Is rotated counterclockwise in the figure by the bias of the spring 33. At this time, the light-shielding lid 7 engaged with the drive shaft 31 is also rotated to the closed position.

As shown in FIG. 3, the drive shaft 31 has a circular shaft portion 31a inserted into the engaging portion 8 of the light shielding cover 7,
A projection 31b projecting from the shaft 31a.
When the rotating member 32 rotates in the closing position direction,
The light-shielding lid 7 is turned to the closed position. Such a drive shaft 3
As shown in FIG. 1, when the light-shielding lid 7 is rotated to the closed position, the first projection 31 b does not release the engagement between the lock pin 9 of the cartridge body 4 and the step 8 b of the light-shielding lid 7. The light-shielding lid 7 is formed in such a shape as to be locked by the lock pin 9 in the closed position.

The operation of the above configuration will be described. The film unit with lens 11 presses the shutter button 14 to take a picture for one photographing frame, rotates the winding dial 27 to rotate the spool 5 of the photographic film cartridge 2, and removes the photographed photographic film 3. It is stored in the cartridge body 4.

When the photographing of all the photographing frames is completed and the photographic film 3 is entirely wound into the cartridge main body 4, the photographic film cartridge 2 is stored in the unit main body 12, and a print request is made to a developing store or the like. You.
The film unit with lens 11 first takes out the photographic film cartridge 2 from the cartridge chamber 25 when developing and printing.

When the bottom cover 22a is opened to take out the photographic film cartridge 2 from the cartridge chamber 25, the connecting member 38 locked by the claw member of the bottom cover 22a is slid downward. Since the upper end 38a of the connecting member 38 is moved below the upper surface 25a of the cartridge chamber, the holding of the locking lever 36 is released, and the rotating member 32 is rotated counterclockwise by the bias of the spring 33. You. Accordingly, the light-shielding lid 7 engaged with the drive shaft 31 also rotates to the closed position, the film entrance 6 is closed by the light-shielding lid 7, and the inside of the cartridge body 4 is kept light-tight.

At this time, as shown in FIG. 1, the protruding portion 31b of the drive shaft 31 rotates when the light shielding cover 7 is turned to the closed position.
The lock pin 9 of the cartridge body 4 and the stepped portion 8b of the light-shielding lid 7 are not disengaged from each other, and are formed in such a shape that the light-shielding lid 7 is locked by the lock pin 9 in the closed position. Therefore, even when the drive shaft 31 is engaged with the engaging portion 8 at the closed position, the light shielding cover 7 is locked at the closed position.

When such a drive shaft rotates the light-shielding cover in both directions between the open position and the closed position as in the prior art, the shape of the protruding portion is changed as indicated by the dotted diagonal line indicated by C in FIG. When the lock pin 9 is bent in the closed position, the step 8
b had to be formed so as to be disengaged. For this reason, the rotation diameter of the conventional drive shaft has to be increased as shown by a dashed line indicated by D in FIG.

However, in the film unit with a lens, when the photographic film cartridge is taken out, it is only necessary to rotate the light shielding cover to the closed position, and the engagement between the lock pin and the light shielding cover is released to open the light shielding cover to the open position. No pivoting function is required. Therefore, the rotation diameter of the drive shaft 31 of the light-shielding lid closing device 30 in the lens-fitted film unit 11 of the present invention is much smaller than the conventional driving shaft as shown by the solid line E in FIG. Device 30
Can be made compact, and the film unit with lens 11 can be reduced in size and weight.
Further, an unnecessary function of releasing the engagement between the lock pin and the light shielding cover and rotating the light shielding cover to the open position can be omitted,
The manufacturing cost of the lens-fitted film unit can be reduced.

The photographic film cartridge 2 with the light shielding cover 7 turned to the closed position as described above is taken out of the cartridge chamber 25 and sent to the developing and printing processes.
It is processed.

[0040]

As described above, the lens-equipped film unit of the present invention is provided on the drive shaft of the light-shielding cover closing device for rotating the light-shielding cover from the open position to the closed position, at the engaging portion of the light-shielding cover. A notch that is in contact with at least a part of the notch, and the length of the rotation center of the drive shaft and the protrusion is
Since the length of the rotation center and the length of the lock pin are set to be equal to or shorter than each other, a photographic film cartridge having a light-shielding cover that can be opened and closed at the film entrance and exit is built in, and a small, lightweight, low-cost film unit with lens that can be manufactured at low cost. Can be provided.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a driving shaft of a light-shielding lid closing device and an engaging portion of a photo-film cartridge with an engaging portion of a light-shielding lid in a lens-fitted film unit embodying the present invention.

FIG. 2 is a perspective view showing the shape of a photographic film cartridge.

FIG. 3 is a perspective view showing a drive shaft of the light shielding cover closing device and an engaging portion of the light shielding cover of the photo film cartridge.

FIG. 4 is an explanatory view showing movements of a drive shaft, a light shielding cover, and a lock pin of the light shielding cover closing device.

FIG. 5 is an external perspective view of a film unit with a lens embodying the present invention.

FIG. 6 is an exploded perspective view showing a main body of a lens-fitted film unit and a photographic film cartridge embodying the present invention.

FIG. 7 is an explanatory view showing an engagement portion between a drive shaft of a conventional light shielding cover closing device and an engagement portion of a light shielding cover of a photographic film cartridge.

[Explanation of symbols]

 2 Photographic film cartridge 4 Cartridge main body 6 Film entrance 7 Shield lid 8 Engaging section 8a Notch section 8b Step section 9 Lock pin 30 Shield lid closing device 31 Drive shaft 31a Shaft section 31b Projecting section

Claims (1)

[Claims] 1. A film is pivotally mounted between a closed position for closing a film door in a light-tight manner and an open position for opening.
A light-shielding lid in which a C-shaped engaging portion having a notch is integrally provided at an end portion, and a lock pin that falls into a step portion provided at an outer edge of the notch and suppresses rotation of the light-shielding lid in a closed position. A photo film cartridge comprising: a photo film cartridge; a cartridge chamber in which the photo film cartridge is stored; and a light shielding cover for rotating the light shielding lid from the open position to the closed position by rotating a drive shaft inserted into the engaging portion. A film unit with a lens having a closing device, wherein the drive shaft is formed with a protrusion that abuts at least a part of the notch, and the center of rotation of the drive shaft and the length of the protrusion are equal to the rotation center. A film unit with a lens, wherein the length is equal to or shorter than the length of the lock pin.