JP2004012709A - Film unit with lens - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To definitely stop power supply to an IC which inhibits charging and to effectively prevent irregular reuse of a film unit. <P>SOLUTION: A contact part 42 can be deformed between the contact position in contact with the plus electrode of a cell 33 and the non-contact position apart from the cell, and is elastically deformed from the non-contact position during manufacturing and held in the contact position by a press plate 35 formed as integrated with the bottom closure 32 of a cartridge chamber 27. When the bottom closure 32 is opened to take out the cartridge 25, engagement by the press plate 35 is released and the contact part 42a recovers to the non-contact position by its elastic force to stop power supplying to an IC 40. Once power supplying to the IC 40 is stopped, it inhibits charging of a strobe apparatus even when power supply is restarted unless a specified release signal is inputted. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lens-fitted photo film unit incorporating a strobe device.
[0002]
[Prior art]
Various types of lens-equipped film units in which an unexposed photographic film is loaded into a unit body equipped with a simple photographing mechanism at the time of manufacture are sold. Some of these lens-equipped film units have a built-in strobe device. In such a lens-fitted photo film unit, used ones are collected by a manufacturer and reused for each component or recycled as a raw material.
[0003]
In order to prevent unauthorized reuse of a used film unit with a lens, various contrivances have been made to the conventional film unit with a lens, and various methods have been proposed. In order to prevent unauthorized reuse, the present applicant has proposed a stroboscopic device for a lens-fitted photo film unit that maintains a state in which a charging operation is prohibited unless a predetermined release operation is performed after the start of power feeding (Japanese Patent Application Laid-Open No. 2000-2000). No. 13637, JP 2000-13638).
[0004]
In the strobe device described in Japanese Patent Laid-Open No. 2000-13637 and Japanese Patent Laid-Open No. 2000-13638, an IC (hereinafter referred to as an IC) that controls whether or not a charging operation can be performed on a strobe board on which various circuit components constituting the strobe device are assembled. The charging prohibition IC is mounted, and power is supplied from the battery of the power source to the charging prohibition IC together with the strobe device. As long as power supply to the strobe device including the charging prohibition IC is started and the predetermined release code is not input to the charging prohibition IC, the state in which the charging operation of the strobe device is prohibited by the charge prohibition IC is maintained. The In the film unit with a lens in which the strobe device is mounted, when the rear cover constituting the unit body is separated, the power supply stop plate provided on the rear cover includes the power supply contact piece of the strobe device and the electrode of the power battery. The power supply between the strobe device and the charging prohibition IC is temporarily stopped.
[0005]
By configuring as described above, when trying to load a new photo film and separating the rear cover from the unit body, the power supply to the flash device including the charging prohibition IC is temporarily cut off at that time, The strobe device and the lens-equipped film unit on which the strobe device is mounted cannot be reused unless a predetermined release code is input to the charging prohibition IC.
[0006]
[Problems to be solved by the invention]
By the way, when the power supply to the strobe device is stopped when the rear cover is separated as described above, the lens-fitted film unit in which the power supply to the strobe device is not stopped is refilled illegally. Can be collected by a person. For this reason, if the rear cover is separated after taking measures to maintain power supply to the strobe device, the charging prohibition IC will no longer perform its intended function, and the refilling of the film unit with a lens and the unauthorized reuse of a film unit with a lens will not be performed. Can not be prevented.
[0007]
The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a lens-fitted film unit that can more reliably prevent reuse of a lens-fitted photo film unit by a manufacturer other than the manufacturer.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, according to the first aspect of the present invention, power supply from the battery to the circuit for inhibiting operation is performed in conjunction with an operation for taking out or taking out a cartridge for storing a photographed photographic film. The power supply stopping means for stopping is provided.
[0009]
According to a second aspect of the present invention, there is provided a power supply contact portion that is displaceable between one electrode of the battery and a contact position that is in contact with a contact from a distant noncontact position, and the cartridge is taken out from the cartridge chamber as a power supply stop means. When the take-out lid for closing is closed, the contact portion is held at the contact position, and when the take-out lid is opened, the contact portion is displaced to the non-contact position.
[0010]
According to a third aspect of the present invention, a power supply contact portion is provided that is displaceable between one electrode of the battery and a contact position that is in contact with a non-contact position, and a jig for opening the bottom lid is inserted. An opening is provided, and the power supply stopping means is configured to displace the contact portion in contact with one electrode of the battery to a non-contact state by inserting a jig into the opening.
[0011]
In the invention according to claim 4, the power supply stopping means is turned on when the cartridge is loaded in the cartridge chamber, and between the battery that is turned off in conjunction with the removal of the cartridge and the operation prohibiting circuit. It is intended as a connected switch.
[0012]
According to the fifth aspect of the present invention, a cartridge having a conductive area on its surface is loaded, and the power supply stopping means is brought into contact with the conductive area of the cartridge loaded in the cartridge chamber to inhibit operation of the battery. A pair of contact pieces for electrically connecting the circuit.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
The appearance of a lens-fitted photo film unit embodying the present invention is shown in FIG. The film unit with a lens includes a unit main body 2 having a simple photographing mechanism, a strobe device, and the like, and an outer body 3 wound around the unit main body 2, and photographing can be performed while the outer body 3 is wound. it can.
[0014]
On the front surface of the unit main body 2, a photographing lens 4, an object-side window 5 a of the finder 5, a strobe light emitting unit 7 of the strobe device, and a charging button 8 are provided. On the top surface, a release button 9 and a counter window 10 for displaying the number of remaining frames that can be photographed are provided. Further, a winding knob 11 that is rotated every time one frame is photographed is exposed on the back side of the unit body 2.
[0015]
As in the conventional film unit with a lens, the film winding is performed by rotating the winding knob 11, and shooting is performed by pressing the release button 9. When the charging button 8 is pressed, charging for strobe light emission is performed, and when the release button 9 is pressed after charging is completed, strobe light is emitted from the strobe light emitting unit 7 toward the subject in synchronization with shooting.
[0016]
As shown in FIG. 2, the unit main body 2 includes a main body base 20, a front cover 21, a rear cover 22, a strobe device 23, and the like, and a photographic film 24 is loaded together with a cartridge 25 at the time of manufacture. The photographic film 24 is of the 135 type, but may be of another type, for example, IX240 format.
[0017]
On both sides of the main body base 20, a film chamber 26 in which a photographic film 24 wound in a roll shape is accommodated and a cartridge chamber 27 in which a cartridge 25 is accommodated are integrally provided. In addition, an aperture 20a that defines the size of the shooting frame on the photographic film 24, that is, an exposure screen, is formed at the center of the main body base 20. An exposure unit 28 is assembled on the front surface of the aperture 20a.
[0018]
The exposure unit 28 includes a shutter mechanism that drives the shutter blades in response to the pressing operation of the release button 9 on the outside of the dark box 29 that shields the photographing optical path between the photographing lens 4 and the photographic film 24, and the remaining frames that can be photographed. Various parts constituting the film counter mechanism for displaying the number, the photographing lens 4, the finder 5 lens, and the like are assembled.
[0019]
The winding knob 11 is rotatably disposed on the upper portion of the cartridge chamber 27, and a shaft integrally provided at the lower portion thereof engages with one end of the spool 25 a of the cartridge 25. As a result, when the winding knob 11 is rotated in the direction of the arrow, the portion of the photographed photographic film 24 is rolled up in the cartridge 25 and the unexposed portion is set behind the aperture 20a.
[0020]
The front cover 21 is formed with an object side window 5a of the viewfinder 5, a charging button 8, and a release button 9, and an opening for exposing the photographing lens 4 and the strobe light emitting unit 7. The front cover 21 is assembled on the front side of the main body base 20 to which the strobe device 23 is assembled.
[0021]
The rear cover 22 covers the back side of the main body base 20 that houses the photographic film 24 and the cartridge 25. Further, bottom covers 31 and 32 are formed on the rear cover 22. These bottom lids 31 and 32 close the bottoms of the film chamber 26 and the cartridge chamber 27 in a light-tight manner. The bottom cover 32 is a take-out cover for the cartridge chamber 27 and is opened when the cartridge 25 containing the photographed photo film 24 is taken out.
[0022]
Below the dark box 29 between the film chamber 26 and the cartridge chamber 27 is a battery chamber in which a battery 33 as a power source of the strobe device 23 is stored. A shielding plate 34 is integrally provided on the bottom lid 32 so as to cover the bottom surface of one end of the battery chamber, and a pressing plate 35 is provided on the upper surface of the shielding plate 34 as power supply stopping means. The retaining plate 35 is formed in a posture in which one surface is directed to the battery chamber side.
[0023]
Although the bottom cover 32 is provided integrally with the rear cover 22, the bottom cover 32 may be a separate component from the rear cover 22. The bottom lid 32 is formed with a locking claw for locking the bottom lid 32 in a closed state, but is omitted in the drawing.
[0024]
The strobe device 23 is unitized by assembling a strobe circuit board 37 with a strobe light emitting unit 7, a sync switch 38, a main capacitor 39, and metal contact pieces 41 and 42 for connecting the battery 33 to the strobe device 23. . The charging switch 43 is turned on when a metal piece 43 a disposed between the front cover 21 and the strobe circuit board 37 is elastically deformed by the pressing of the charging button 8 and contacts a pair of contacts 43 b on the strobe circuit board 37. Become. When the charge switch 43 is turned on, the main capacitor 39 is charged.
[0025]
The synchro switch 38 is composed of a pair of contact pieces arranged side by side. When the shutter mechanism is operated, the upper contact piece is pressed by the shutter blade and comes into contact with the lower contact piece. . When the sync switch 38 is turned on, the main capacitor 39 is discharged and strobe light is emitted from the strobe light emitting unit 7.
[0026]
The contact piece 41 is in contact with the negative electrode of the battery 33 disposed in the battery chamber. A contact portion 42 a that contacts the positive electrode of the battery 33 is provided at the end of the other contact piece 42. The contact portion 42a can be elastically deformed from a non-contact position away from the plus electrode of the battery 30 to a contact position in contact with the plus electrode.
[0027]
As shown in FIG. 3, when the bottom cover 32 closes the bottom of the cartridge chamber 27, the contact part 42 a comes into contact with the holding plate 30 formed on the bottom cover 32, so that the contact part 42 a is in the contact position. Retained. As a result, power is continuously supplied from the battery 33 to the strobe device 23 and the IC 40 described later.
[0028]
When the bottom cover 32 is opened to take out the cartridge 25, the retaining plate 35 is retracted from the position where it comes into contact with the contact portion 42a. For this reason, as shown in FIG. 4, the contact part 42a returns to a non-contact position from a contact position with the elastic force. Thereby, the connection with the positive electrode of the battery 33 is cut off, and the power supply of the strobe device 23 and the IC 40 is stopped. In addition, when the shielding plate 34 covers the lower portion of the contact portion 42a, the bottom lid 32 cannot be opened while the contact portion 42a is held at the contact position using a tool or the like. Further, the connection on the negative electrode side of the battery 33 may be disconnected.
[0029]
As shown in FIG. 5, an IC 40 is surface-mounted on the strobe circuit board 37. The IC 40 is provided as an operation prohibiting circuit that shifts to a prohibition state in which the operation of the strobe device 23 is prohibited when power supply from the battery 33 of the power source is cut off, and maintains the prohibition state even when power supply is resumed. The battery 33 receives power from the battery 33 through the contact pieces 41 and 42 together with the strobe device 23. Therefore, the power supply to the IC 40 is stopped by opening the bottom cover 32.
[0030]
The IC 40 prohibits the charging operation by short-circuiting the input terminals of the oscillation transistor 44a forming the charging circuit 44 (see FIG. 6), for example, and the IC 40, the oscillation transistor 44a, and the wiring pattern between them. Is covered with a protective layer 45 having insulating properties. The protective layer 45 cannot be modified in hardware to invalidate the function of the IC 40 by removing the IC 40, connecting another oscillation transistor instead of the oscillation transistor 44a, or adding a jumper line. It is provided to
[0031]
The strobe circuit board 37 is provided with an input terminal 46 for inputting a release signal to the IC 40. After power supply is started, the prohibition of the charging operation of the strobe device 23 by the IC 40 is released by inputting a predetermined release signal to the IC 40 via the input terminal 46.
[0032]
FIG. 6 shows an outline of the electrical configuration of the strobe device 23. The IC 40 and the charging circuit 46 receive power from the battery 33 via the contact pieces 41 and 42. The IC 40 prohibits the operation of the strobe device 23 by prohibiting the operation of the charging circuit 41 until a predetermined release signal is input after the start of power feeding. The charging circuit 41 that is permitted to operate when a predetermined release signal is input to the IC 40 charges the main capacitor 39 when the charging switch 43 is turned on.
[0033]
The strobe discharge tube 47 is disposed in the strobe light emitting unit 7 and emits strobe light when a trigger voltage is applied while the main capacitor 39 is charged. The trigger circuit 48 applies a trigger voltage to the strobe discharge tube 47 when the sync switch 38 is turned on.
[0034]
Although the charging operation is prohibited in the strobe device 23, the operation of the strobe device 23 may be prohibited by preventing the generation of the trigger voltage, the application of the trigger voltage, the discharge of the main capacitor 39, and the like. ]
Next, the operation of the above configuration will be described. At the time of manufacturing the lens-fitted photo film unit by the manufacturer, the photographic film 24 and the cartridge 25 are loaded into the main body base 20 to which the exposure unit 28 is assembled, and the rear cover 22 is assembled to the back surface of the main body base 20. The bottoms 31 and 32 close the bottoms of the film chamber 26 and the cartridge chamber 27 in a light-tight manner.
[0036]
After the strobe device 23 is assembled to the main body base 20 to which the rear cover 22 and the like are assembled as described above, the battery 29 is attached to the strobe device 23. At this time, the contact portion 42a is elastically deformed and assembled so that the contact portion 42a of the contact piece 42 contacts the surface of the holding plate 35 on the battery chamber side. Thereby, as shown in FIG. 3, the state where the contact portion 42 a is elastically deformed to the contact position is maintained by the retaining plate 35.
[0037]
And since the contact part 42a is a contact position, by mounting | wearing the battery 33 between the contact piece 41 and the contact part 42a, a minus electrode becomes the contact piece 41, and a plus electrode becomes the contact part 42a, respectively. Then, power supply to the IC 40 and the strobe device 23 is started. However, at this time, the charging circuit 44 is in a state where its charging operation is prohibited by the IC 40.
[0038]
At the time of shipment from the manufacturer, it is necessary to allow the charging operation to be permitted. Therefore, after power supply is started as described above, a predetermined release signal is input from the input terminal 46. Due to the input of the release signal, the IC 40 is allowed to charge the charging circuit 44.
[0039]
After the strobe device 23 is allowed to operate in this manner, the remaining parts are assembled to the main body base 20 to complete the unit main body 2. The completed unit body 2 is wound around the exterior body 3 after various inspections are performed. This completes the lens-fitted photo film unit. The completed lens-fitted photo film unit is shipped and used for photographing under the user.
[0040]
At the time of shooting, shooting is performed in the same manner as a conventional film unit with a lens. Of course, since the operation of the charging circuit 44 is allowed, the main capacitor 39 is charged if the charging button 8 is pressed, and if the release button 9 is pressed after the charging is completed, it is synchronized with the opening and closing of the shutter blades. Strobe light is emitted.
[0041]
When shooting of the last shooting frame is completed, the winding knob 11 can be continuously rotated. The photographer continuously rotates the winding knob 11 to wind up the entire photographic film 24 in the cartridge 25, and submits the film unit with a lens together to the developing station or DPE.
[0042]
At the developing station or the like, the bottom cover 32 of the submitted lens-fitted film unit is opened, and the cartridge 25 containing the photographed photographic film 24 is taken out from the cartridge chamber 27. Then, the photographic film 24 is subjected to development processing, and a printed photograph is created from each photographed frame of the developed photographic film 24. The photo film 24 is returned to the user together with the print photo.
[0043]
As described above, when the cartridge 25 is removed from the cartridge chamber 27, when the bottom cover 32 is opened, the bottom plate 32 is opened and the retaining plate 35 is retracted from the position where it comes into contact with the contact portion 42a. For this reason, as shown in FIG. 4, the contact portion 42 a returns from the contact position to the non-contact position due to its elastic force, and moves away from the positive electrode of the battery 33.
[0044]
As described above, when the contact portion 42a is separated from the positive electrode of the battery 33, the power supply to the IC 40 and the strobe device 23 is stopped. Since the power supply to the IC 40 is stopped, even if the power supply is restarted thereafter, the operation of the strobe device 23 by the IC 40 is prohibited unless a predetermined release signal is input. Reuse can be prevented. The removal of the cartridge 25 is an operation that must be performed at a developing station or the like, and thus can be reliably prevented from being reused.
[0045]
FIG. 7 shows an example in which the power supply to the IC is stopped by opening the take-out lid. Other than that described below, this embodiment is the same as the above embodiment.
[0046]
A shielding plate 50 is formed on the bottom lid 32 so as to cover the lower side of one end of the contact piece 42, and an opening 51 is formed in the shielding plate 50. The bottom lid 32 is opened by inserting a minus driver 52, a dedicated jig or the like into the opening 51, and operating the minus driver 52 or the like so as to rotate about a connecting portion with the rear cover 22. The bottom cover 32 may be a separate part from the rear cover 22 or may be separated.
[0047]
At the end of the contact piece 42, a contact portion 54 that is bent in a “<” shape and contacts the positive electrode of the battery 33 is provided. At the upper end of the contact portion 54, an “L” -shaped pressed portion 54 a is formed that extends toward the cartridge chamber and is bent upward at the end.
[0048]
Above the shielding plate 50, a lever 55 is disposed as a power supply stopping means, which is rotatably attached to a shaft (not shown) extending forward from the main body base 20. The lever 55 has a substantially “F” shape, the lower end 55a is disposed in the vicinity of the opening 51, the upper end is bent so as to extend in the direction toward the battery 33, and a pressing portion 55b is formed at the tip thereof. Yes. In the vicinity of the lower end 55a, there is provided a restricting portion 55c for restricting the insertion direction of the driver 52 and the like inserted from the opening 51 and bringing the tip of the driver 52 into contact with the lower end 55a.
[0049]
Until the opening operation of the bottom lid 32 is performed, the pressing portion 55b contacts the upper surface of the non-pressing portion 54a, and the lever 55 is supported by the rigidity of the contact portion 54. In this state, contact between the positive electrode of the battery 33 and the contact portion 54 is maintained, and power is supplied to the strobe device 23 including the IC 40.
[0050]
When the cartridge 25 is taken out, a minus driver 52 or the like is inserted into the unit main body 2 from the opening 51, and the bottom cover 32 is operated so as to rotate about the connecting portion with the rear cover 22. By opening the bottom lid 32, the bottom lid 32 is opened, and the cartridge 25 can be taken out from the cartridge chamber 27.
[0051]
Further, by the opening operation of the bottom lid 32, the lower end 55a is pressed by the tip of the minus driver 52 or the like inserted from the opening 51, the lever 55 is rotated in the direction of the arrow in the figure, and the pressing portion 55b is pressed. The part 54a is pressed downward. As a result, the contact portion 54 is elastically deformed while moving in a direction away from the plus electrode, and power supply to the strobe device 23 including the IC 40 is cut off. Accordingly, the operation of the strobe device 23 is prohibited by the opening operation of the bottom cover 32, and the state in which the operation of the strobe device 23 is prohibited even when the power supply is resumed is maintained.
[0052]
8 and 9 show examples in which power supply to the IC is stopped in conjunction with the removal of the cartridge from the cartridge room. A switch 61 including a pair of contact pieces 61 a and 61 b is provided on a side wall surface in the cartridge chamber 27. One contact piece 61a is fixed to the side wall surface, and the other contact piece 61b is moved from a non-contact position away from the contact piece 61a as shown in FIG. 9 to a contact position contacting the contact piece 61a as shown in FIG. Elastic deformation is possible. The IC 40 receives power from the battery 33 via the switch 61 configured as described above.
[0053]
When the cartridge 25 is loaded into the cartridge chamber 27 during manufacturing, the contact piece 61b is pressed by the cartridge 25 and elastically deformed toward the contact position. When the loading is completed, as shown in FIG. 8, the contact piece comes into contact with the peripheral surface of the cartridge 25 and is held at the contact position, and the switch 61 is turned on. As a result, power is supplied to the IC 40.
[0054]
When the bottom lid 32 is opened and the cartridge 25 is taken out from the cartridge chamber 27, the contact piece 61b returns from the contact position to the non-contact position by its elastic force, so that the switch 61 is turned off. Accordingly, in conjunction with the removal of the cartridge 25, the power supply to the IC 40 is cut off, and the operation of the strobe device 23 is prohibited.
[0055]
FIG. 10 shows another example in which the power supply to the IC is stopped in conjunction with the removal of the cartridge from the cartridge room. A pair of contact pieces 63 a and 63 b are provided on the side wall surface in the cartridge chamber 27. Each of the contact pieces 63a and 63b is in contact with the side surface of the loaded cartridge 25 by its elastic force.
[0056]
The cartridge 25 used in this film unit with a lens is provided with a conductive area 64 at a portion facing each contact piece 63a, 63b. The conductive area 64 is a conductive part, and is created using a technique such as applying metal plating to the outer surface of the cartridge or attaching a metal foil. Further, when a metal cartridge having conductivity is used, the metal may be exposed with the portion unpainted. The IC 40 receives power from the battery 33 via a pair of contact pieces 63a and 63b that are electrically connected by the conductive area 64.
[0057]
According to this example, when the cartridge 25 is loaded in the cartridge chamber 27, the pair of contact pieces 63 a and 63 b are in contact with the conductive area 64 and are electrically connected, so that the IC 40 is supplied with power from the battery 33. The When the cartridge 25 is taken out from the cartridge chamber 27, the connection between the contact piece 63a and the contact piece 63b is cut off, so that the power supply to the IC 40 is cut off.
[0058]
【The invention's effect】
As described above, according to the present invention, when power supply is cut off, the strobe device shifts to a prohibited state in which the operation is prohibited, and power supply to the operation prohibition circuit that maintains the prohibited state even when power supply is resumed. Since the camera is stopped in conjunction with the removal of the cartridge or the operation for removal, it is possible to shift to a prohibited state in which the operation of the strobe device is prohibited by the removal of the cartridge, which is always performed. Unauthorized reuse of strobe devices can be extremely difficult.
[Brief description of the drawings]
FIG. 1 is a perspective view showing the appearance of a lens-fitted photo film unit embodying the present invention.
FIG. 2 is an exploded perspective view showing a configuration of a lens-fitted photo film unit.
FIG. 3 is an explanatory diagram showing a state in which a contact portion that comes into contact with a battery is held at a contact position by a pressing plate provided on the bottom lid.
FIG. 4 is an explanatory diagram showing a state of a contact portion that has returned to a non-contact position when the bottom lid is opened.
FIG. 5 is a perspective view showing a strobe device.
FIG. 6 is a block diagram showing an electrical configuration of the strobe device.
FIG. 7 shows an example in which power feeding is stopped by inserting a jig into the opening for opening the bottom lid.
FIG. 8 is an explanatory diagram showing an example in which a switch is provided in a cartridge room, and showing a state in which the switch is turned on.
FIG. 9 is an explanatory diagram showing a state where a switch is off in the example shown in FIG. 8;
FIG. 10
The example which provided the conductive area in the cartridge is shown.
[Explanation of symbols]
2 Unit body 23 Strobe device 24 Photo film 25 Patrone 32 Bottom cover 33 Battery 35 Holding plate 40 IC
42 Contact piece 42a Contact part 51 Opening 55 Lever 54 Contact part 61 Switch 63a, 63b Contact piece 64 Conductive area

Claims (5)

A lens having a strobe device and an operation prohibiting circuit that shifts to a prohibition state in which the operation of the strobe device is prohibited when power supply from the battery of the power source is cut off and maintains the prohibition state even when power supply is resumed In the attached film unit,
A lens-equipped film comprising: a power supply stopping means for stopping power supply from the battery to the operation prohibiting circuit in conjunction with an operation for taking out or removing the cartridge for storing the photographed photo film. unit. A contact portion for feeding power that is displaceable between one electrode of the battery and a contact position that is in contact with the electrode from a distant contact position; and the feeding stop means closes a take-out lid for taking out the cartridge from the cartridge chamber. 2. The lens-fitted photo film unit according to claim 1, wherein the contact portion is held at a contact position when being moved, and the contact portion is displaced to a non-contact position when the take-out lid is opened. In addition to providing a contact portion for power supply that can be displaced between a contact position that is in contact with one electrode of the battery from a non-contact position away from the electrode, an opening into which a jig for opening the bottom lid is inserted is provided. 2. The lens-fitted photo film unit according to claim 1, wherein the power supply stopping unit displaces a contact portion in contact with one electrode of the battery to a non-contact state by inserting a jig into the opening. 3. The power supply stopping means is a switch connected between the battery and the operation prohibition circuit which is turned on when a cartridge is loaded in the cartridge chamber and which is turned off in conjunction with the removal of the cartridge. 2. The lens-fitted photo film unit according to claim 1, wherein: A cartridge having a conductive area on its surface is loaded, and the power supply stopping means is in contact with the conductive area of the cartridge loaded in the cartridge chamber so that the battery and the operation prohibiting circuit are in contact with each other. 2. The lens-fitted photo film unit according to claim 1, wherein the film unit is a pair of electrically connected pieces.

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