JP3668337B2 - Film unit with lens - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a film unit with a lens in which a photographic film cartridge having a light-shielding lid that can be opened and closed at a film entrance is incorporated.
[0002]
[Prior art]
For example, a photographic film that has been proposed in this technical field and described in the magazine “Photographic Industry” (Photographic Publishing Co., Ltd., March 1995 issue p.27) is wound around the cartridge body to the rear end. Instead of pasting telemp (tightly flocked ribbon) to shield the film entrance and exit, it is made of plastic that can rotate between the open position where the film entrance is opened and the closed position where the film entrance is closed and shielded. A photographic film cartridge using a light shielding lid is known. Such a method is called “Advanced Photo System”.
[0003]
The end of the light-shielding lid of such a photographic film cartridge is provided with a notch-shaped engaging portion exposed from the end face of the photographic film cartridge, and a drive shaft incorporated in a camera or the like is provided in this engaging portion. The light shielding lid is opened and closed by being engaged and rotated.
[0004]
By the way, in the photographic film cartridge described above, when the photographic film wound inside is carelessly rotated from the closed position to the open position, especially in a state before development, the photographic film is exposed to light. There is a risk. Thus, in order to prevent accidents such as accidentally rotating the light shielding lid from the closed position to the open position, the photo film cartridge corresponding to “Advanced Photo System” has a light shielding lid 52 as shown in FIG. When in the closed position, the elastic lock pin 54 protruding integrally with the cartridge main body engages with the stepped portion 53a formed in the engaging portion 53 of the light shielding lid 52 (b position in the figure), and the light shielding lid. The structure prevents the 52 from inadvertently rotating in the opening position direction.
[0005]
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 inserted so as to coincide with the notch-shaped engaging portion 53. At this time, as shown in FIG. 7, the drive shaft 55 is shaped so as to bend the lock pin 54 of the cartridge body so as to be disengaged from the stepped portion 53a (a position in the drawing). When the drive shaft 55 is inserted, the engagement between the light shielding cover 52 and the lock pin 54 is released, and the light shielding cover 52 can be rotated to the open position by the rotation of the drive shaft 55.
[0006]
Such “Advanced Photo System” photographic film cartridges are smaller and lighter than conventional 135 photographic film cartridges, and therefore need to be made thinner and lighter as well as cameras. It has been proposed to be used for a film unit with a lens.
[0007]
As described above, when the “Advanced Photo System” photographic film cartridge is used for the lens-fitted photo film unit, the lens-fitted photo film unit draws out the photographic film from the photographic film cartridge in advance, and the photographic film cartridge is loaded into the photo film cartridge every time a picture is taken. Therefore, it is sufficient that the light-shielding lid can be rotated in one direction to the closed position when taking out the photographic film cartridge.
[0008]
Further, 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 does not need to bend so that the lock pin described above is detached from the stepped portion. Since the photographic film cartridge is taken out of the cartridge chamber after the light shielding lid is closed, there is no problem even if the light shielding lid is locked in the closed position by the lock pin.
[0009]
[Problems to be solved by the invention]
As described above, when the photographic film cartridge is taken out from the cartridge chamber of the lens-fitted photo film unit, the drive shaft of the closing device that rotates the light shielding lid to the closed position is the conventional drive in the light shielding lid opening / closing device used in the camera. If the shape of the shaft is such that the engagement between the lock pin of the cartridge main body and the light shielding cover is released at the closed position of the light shielding cover, the diameter of the drive shaft increases, and accordingly, the device for closing the light shielding cover becomes larger. This is an obstacle to reducing the size and weight of the lens-fitted photo film unit.
[0010]
As described above, in the lens-fitted photo film unit, when the photographic film cartridge is taken out from the cartridge chamber, the engagement between the lock pin of the cartridge body and the light shielding cover is released at the closed position of the light shielding cover. There is no necessity at all, and having unnecessary functions leads to an increase in manufacturing cost.
[0011]
SUMMARY OF THE INVENTION The present invention is to solve the above problems, and provides a lens-fitted photo film unit that has a built-in photographic film cartridge having a light-shielding lid that can be freely opened and closed at the entrance and exit of the film, and that can be manufactured in a small size and at a low cost. Objective.
[0012]
[Means for Solving the Problems]
In order to solve the above-described problems, in the lens-fitted photo film unit of the present invention, the notch provided in the engaging portion of the light shielding lid is connected to the drive shaft of the light shielding lid closing device that rotates the light shielding lid from the open position to the closed position. And a length of the rotation center of the drive shaft and the protrusion is the same as or shorter than the length of the rotation center and the lock pin.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of a film unit with a lens embodying the present invention will be described. First, the configuration of the “Advanced Photo System” photo film cartridge built in the lens-fitted photo film unit of the present invention will be described. As shown in FIG. 2, the photographic film cartridge 2 comprises 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 engage with each other. A spool 5 on which one end of the photographic film 3 is locked is pivotally attached to the center of the cartridge body 4 so as to be rotatable.
[0014]
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 lid 7 that holds the inside of the cartridge body 4 in a light-tight manner is rotatably attached to the film entrance 6 so as to be rotatable between a closed position where the film entrance 6 is closed and an open position where the film entrance 6 is opened. As shown in FIG. 3, an engaging portion 8 having a notch 8 a is integrally provided at the end portion of the light shielding lid 7.
[0015]
The engaging portion 8 of the light shielding lid 7 is engaged with a drive shaft 31 of a light shielding lid closing device 30 which will be described in detail later. Then, the light-shielding lid 7 rotates between the open position (FIG. 4A) and the closed position (FIG. 4B) by the rotation of the drive shaft 31. Further, in the vicinity of the film entrance / exit 6 of the cartridge body 4, as shown in FIG. 4B, when the light shielding lid 7 is in the closed position, it engages with a stepped portion 8 b provided in a part of the engaging portion 8. In addition, a lock pin 9 that prevents the light shielding lid 7 from rotating in the opening position direction and locks the light shielding lid 7 in the closed position is provided integrally with the upper case 4a.
[0016]
In the photographic film 3, two perforations 3 a are provided for each photographing frame, and one end is engaged with the spool 5. With such a configuration, the photographic film 3 is wound around the spool 5 and stored in the cartridge body 4, and the film entrance / exit 6 is closed by the light shielding lid 7 by placing the light shielding lid 7 in the closed position. Is kept light tight. Further, the lock pin 9 engages with the step portion 8b of the light shielding lid 7, and the light shielding lid 7 is locked in the closed position.
[0017]
Further, the photographic film 3 is fed out of the cartridge main body 4 from the film inlet / outlet 6 by rotating the light shielding lid 7 to the open position to open the film inlet / outlet 6 and rotating the spool 5. In order to rotate the light-shielding lid 7 from the closed position to the open position, a lock shaft 9 is bent and a drive shaft having a large diameter that can be disengaged from the stepped portion 8b of the light-shielding lid 7 is engaged. Insert into the joint 8 and rotate in the direction of the opening position.
[0018]
In the case of the lens-fitted photo film unit, the photographic film 3 that has been drawn out in advance is wound up into the cartridge body 4 from the film entrance 6 and the photographic film cartridge is taken out after the entire amount is wound up. 3 is never paid out.
[0019]
Next, the configuration of the lens-fitted photo film unit of the present invention in which the above-described photographic film cartridge is incorporated will be described. FIG. 5 is an external perspective view of the lens-fitted photo film unit of the present invention, and FIG. 6 is an exploded perspective view of the main body base. The lens-fitted photo film unit 11 is composed of a unit main body 12 in which a photographic film cartridge 2 is previously loaded and various photographing mechanisms are incorporated, and an exterior paper 13 that partially covers the unit main body 12.
[0020]
On the upper surface of the unit main body 12, an integrally formed shutter button 14 and a number-of-photographing number display window 15 are provided. The exterior paper 13 has an adhesive applied to the back surface and is attached so as to be wound around the central portion of the unit main body 12, and an opening that exposes the photographing lens 17, the finder 16, the photographing number display window 15 and the like to the outside is formed. Yes.
[0021]
The unit main body 12 includes a front cover 21 that forms the front side of the unit main body 12, a rear cover 22 that forms the rear side, and a main body base 23 that is accommodated between the front cover 21 and the rear cover 22 (see FIG. 6). ), And a well-known exposure unit (not shown) and strobe unit (not shown) assembled on the front side of the main body base 23.
[0022]
Although not shown, the exposure unit includes a shutter charge mechanism, a film winding mechanism, a counter feed mechanism, a shutter drive mechanism and shutter blades, a photographic lens 17 and the like, as well as a conventional lens-equipped film unit. The objective lens and the eyepiece are unitized. Although not shown, the strobe unit includes a printed circuit board on which a strobe circuit is provided and a strobe light emitting unit 19 assembled to the printed circuit board. The strobe unit is charged by pressing the strobe charge switch 18 provided on the front cover 21. The flash is emitted in sync with the shutter release.
[0023]
As shown in FIG. 6, an aperture 24 that shields the photographing optical path from the exposure unit assembled on the front surface side to the photographic film 3 is provided at the center of the main body base 23. On both sides of the aperture 24, there are integrally formed a cartridge chamber 25 and a film roll chamber 26 in which a cartridge body 6 and a film roll 3b in which a photographic film 3 is wound in a roll shape are respectively stored in the manufacturing stage. .
[0024]
In the cartridge chamber 25 and the film roll chamber 26, a rear cover 22 is assembled on the back side of the main body base 23, and a cartridge chamber bottom cover 22a (see FIG. 5) formed integrally with the rear cover 22; By closing the bottom cover (not shown) for the film roll chamber, the inside is kept light tight. The bottom cover 22a is connected to the rear cover 22 via a thin bendable portion, and is opened when the photographic film cartridge 2 is taken out from the lens-fitted film unit 11 after use.
[0025]
A winding dial 27 is rotatably attached to the upper surface 25 a of the cartridge chamber 25, and a winding shaft 28 provided integrally with the lower surface of the cartridge chamber 25 engages with the engagement hole 5 a of the spool 5 of the photographic film cartridge 2. ing. The winding dial 27 is rotated counterclockwise in the drawing every time one frame is photographed by pressing the shutter button 14, and one frame of the photographic film 3 is rotated by the rotation of the spool 5 until the winding dial 27 is locked. Is wound around the cartridge body 4.
[0026]
Further, when the photographic film 3 is wound up by one frame, the two-tooth sprocket of the exposure unit engaged with the perforation 3a is rotated. The exposure unit uses the rotational force of the two-tooth sprocket to stop film winding, shutter charge, update the number of shots taken, etc. By repeating the shooting by pressing the shutter button 14 and the rotation operation of the winding dial 27, the shooting 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.
[0027]
In addition to the winding dial 27, the cartridge chamber upper surface 25a is assembled with a drive shaft 31 that constitutes the light shielding lid closing device 30, a rotating member 32 that is a drive mechanism, and a spring 33. The rotating member 32 is inserted into the opening 34 and engaged with the engaging portion 8 of the light shielding lid 7, and is integrally formed on the upper portion of the driving shaft 31 and disposed on the upper surface 25 a of the cartridge chamber 25. The latch lever 36 and the spring holding portion 37 to which the spring 33 is assembled.
[0028]
The spring 33 urges the rotating member 32 in the counterclockwise direction (the closing direction of the light shielding lid 7) in the drawing, and the light is blocked by the rotation of the rotating member 32 in the counterclockwise direction by the urging of the spring 33. The lid 7 is rotated to the closed position.
[0029]
The rotating member 32 is held at the open position of the light shielding lid 7 against the bias of the spring 33, and the drive shaft 31 is engaged with the engaging portion 8 of the light shielding lid 7 at the open position. When the photographic film cartridge 2 is taken out after use of the lens-fitted photo film unit 11, the holding of the rotating member 32 is released, and the spring 33 is urged to rotate in the closing direction of the light shielding lid 7, thereby driving the drive shaft. The light shielding lid 7 engaged with 31 is also rotated to the closed position. As described above, the rotation member 32 is held at the open position of the light shielding lid 7 and the holding of the rotation member 32 is released between the cartridge chamber 25 and the aperture 24 when the photographic film cartridge 2 is taken out. This is a rod-shaped connecting member 38 that is slidably assembled in the vertical direction.
[0030]
The connecting member 38 is held by a claw member in a state where an upper end portion 38a protrudes from the upper surface 25a of the cartridge chamber in a guide groove 39 formed between the cartridge chamber 25 and the aperture 24. The upper end portion 38 a holds the rotating member 32 at the open position of the light shielding lid 7 by pressing the locking lever 36 of the rotating member 32 against the bias of the spring 33.
[0031]
Further, the connecting member 38 in a state where the rotating member 32 is held is a claw member (not shown) in which an engaging claw 38 b formed at the lower end is formed integrally with a bottom cover 22 a that covers the bottom surface of the cartridge chamber 25. Locked. Then, when the bottom cover 22a is opened to take out the photographic film cartridge 2 after using the lens-fitted photo film unit 11, the connecting member 38 locked to the claw member of the bottom cover 22a is slid downward. As a result, the upper end portion 38a of the connecting member 38 is moved below the cartridge chamber upper surface 25a, so that the retaining lever 36 is released and the rotating member 32 is counterclockwise in the figure by the bias of the spring 33. It is rotated. At this time, the light shielding lid 7 engaged with the drive shaft 31 is also rotated to the closed position.
[0032]
As shown in FIG. 3, the drive shaft 31 includes a circular shaft portion 31a inserted into the engaging portion 8 of the light shielding lid 7, and a protruding portion 31b protruding from the shaft portion 31a. By rotating 32 in the closed position direction, the light shielding lid 7 is rotated to the closed position. As shown in FIG. 1, such a protruding portion 31 b of the drive shaft 31 engages between the lock pin 9 of the cartridge body 4 and the step portion 8 b of the light shielding lid 7 when the light shielding lid 7 is rotated to the closed position. The light-shielding lid 7 is formed in a shape that is locked by the lock pin 9 in the closed position without releasing the.
[0033]
The operation of the above configuration will be described. The lens-fitted photo film unit 11 presses the shutter button 14 to shoot one frame, and rotates the winding dial 27 to rotate the spool 5 of the photographic film cartridge 2 so that the photographic film 3 that has been photographed is taken. The cartridge body 4 is stored.
[0034]
When the photographing of all the frames is completed and all the photographic film 3 is wound into the cartridge main body 4, a print request is made to a development dealer or the like while the photographic film cartridge 2 is stored in the unit main body 12. The lens-fitted photo film unit 11 first takes out the photographic film cartridge 2 from the cartridge chamber 25 during development and printing.
[0035]
When the bottom cover 22a is opened in order to take out the photographic film cartridge 2 from the cartridge chamber 25, the connecting member 38 locked to the claw member of the bottom cover 22a is slid downward. Since the upper end portion 38a of the connecting member 38 is moved below the cartridge chamber upper surface 25a, the retaining lever 36 is released and the rotating member 32 is rotated counterclockwise by the bias of the spring 33. The As a result, the light-shielding lid 7 engaged with the drive shaft 31 is also rotated to the closed position, the film entrance 6 is closed by the light-shielding lid 7, and the inside of the cartridge main body 4 is kept light-tight.
[0036]
At this time, as shown in FIG. 1, the protrusion 31 b of the drive shaft 31 engages between the lock pin 9 of the cartridge body 4 and the stepped portion 8 b of the light shielding lid 7 when the light shielding lid 7 is rotated to the closed position. Since the shading lid 7 is formed in a shape that is locked by the lock pin 9 at the closed position without releasing the, the drive shaft 31 is engaged with the engaging portion 8 at the closed position. Even in the state, the light shielding lid 7 is locked in the closed position.
[0037]
When such a drive shaft rotates the light shielding lid in both directions of the open position and the close position as in the prior art, the shape of the protruding portion is changed to the closed position as indicated by the dotted diagonal line indicated by C in FIG. Thus, the lock pin 9 must be bent so that the engagement with the stepped portion 8b of the light shielding lid 7 is released. For this reason, the rotational diameter of the conventional drive shaft has to be increased as indicated by the alternate long and short dash line indicated by D in FIG.
[0038]
However, in the lens-fitted photo film unit, it is only necessary to rotate the light-shielding lid to the closed position when taking out the photographic film cartridge. No function is required. Therefore, the rotational diameter of the drive shaft 31 of the light shielding lid closing device 30 in the film unit with lens 11 of the present invention is significantly smaller than the conventional driving shaft as indicated by the solid line E in FIG. The apparatus 30 can be configured compactly, and the lens-fitted photo film unit 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, and the manufacturing cost of the lens-fitted photo film unit can be reduced.
[0039]
The photographic film cartridge 2 having the light-shielding lid 7 rotated to the closed position as described above is taken out from the cartridge chamber 25, sent to the development and printing processes, and processed.
[0040]
【The invention's effect】
As described above, the lens-fitted photo film unit of the present invention has at least one notch provided in the engaging portion of the light shielding lid on the drive shaft of the light shielding lid closing device that rotates the light shielding lid from the open position to the closed position. The projecting part that contacts the part is formed, and the length between the rotation center of the drive shaft and the projecting part is the same as or shorter than the length of the rotation center and the lock pin. It is possible to provide a lens-fitted photo film unit that has a built-in photographic film cartridge having a lid and is small, light, and can be manufactured at low cost.
[Brief description of the drawings]
FIG. 1 is an explanatory view showing an engaging portion between a driving shaft of a light shielding lid closing device and an engaging portion of a light shielding lid of a photographic film cartridge in a lens-fitted photo 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 lid closing device and an engaging portion of the light shielding lid of the photographic film cartridge.
FIG. 4 is an explanatory diagram showing movements of a drive shaft, a light shielding lid, and a lock pin of the light shielding lid closing device.
FIG. 5 is an external perspective view of a lens-fitted photo film unit embodying the present invention.
FIG. 6 is an exploded perspective view showing a main body base and a photographic film cartridge of a lens-fitted photo film unit according to the present invention.
FIG. 7 is an explanatory view showing an engagement portion between a drive shaft of a conventional light shielding lid closing device and an engagement portion of a light shielding lid of a photographic film cartridge.
[Explanation of symbols]
2 Photo film cartridge 4 Cartridge body 6 Film entrance / exit 7 Light shielding lid 8 Engaging portion 8a Notch portion 8b Stepped portion 9 Lock pin 30 Light shielding lid closing device 31 Drive shaft 31a Shaft portion 31b Protruding portion

Claims (1)

A light-shielding lid that is pivotally mounted between a closed position that closes the film entrance and exits in a light-tight manner and an open position that opens, and a C-shaped engaging portion having a notch is integrally provided at the end; A photographic film cartridge comprising a lock pin that falls into a stepped portion provided on an outer edge of the notch and prevents rotation of the light shielding lid at a closed position; a cartridge chamber in which the photographic film cartridge is stored; and the engaging portion In a film unit with a lens having a light-shielding lid closing device that rotates a drive shaft inserted into the light-shielding lid and rotates the light-shielding lid from the open position to the closed position.
A protrusion is formed on the drive shaft so as to contact at least a part of the notch, and the length of the rotation center of the drive shaft and the protrusion is equal to or shorter than the length of the rotation center and the lock pin. A film unit with a lens, characterized by

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