JP2005049600A - Lens-fitted photographic film unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently use a dedicated battery built in a lens-fitted photographic film unit. <P>SOLUTION: The lens-fitted photographic film unit 2 comprises a main body 3 of the unit and an outer packing sheet 4. In the outer packing sheet 4, switching blocking chips 68, 69 are formed in one. The switching blocking chips 68, 69 cover over a strobe charging switch 8 and a light guide 13. When the switching blocking chips 68, 69 are removed along perforations at the time of use, the strobe charging switch 8 and the light guide 13 are exposed and strobe charging is enabled. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a lens-fitted photo film unit, and more particularly to a lens-fitted photo film unit incorporating a dedicated battery.

2. Description of the Related Art A lens-equipped film unit is known as a single use type simple camera preloaded with a photographic film. 2. Description of the Related Art Conventionally, an AA or AAA type battery is generally incorporated in a lens-fitted photo film unit. The AA / D4 standard batteries are mainly used as a power source for a strobe device incorporated in a lens-fitted photo film unit. In recent years, in order to reduce the environmental burden, the power saving design of the strobe circuit has progressed, and switching from a larger AA type battery to a smaller AA type battery or a smaller battery is considered. Therefore, it is desired to reduce CO ₂ emission by using such a small battery.

  As described above, the dry cell built in the lens-fitted photo film unit is larger in both dimensions and weight than other parts constituting the lens-fitted photo film unit. It was often a hindrance. Therefore, the lens-equipped film unit described in Patent Document 1 attempts to reduce the size by devising the internal component arrangement. In this film unit with a lens, the structure of the unit body consists of a lens barrel unit for holding a photographing lens, a cartridge chamber for storing a cartridge, and a scroll chamber for winding the film, and the lens barrel unit and the cartridge chamber. In addition to placing a dry cell in the gap, a main capacitor for the strobe is placed on the opposite side of the dry cell, that is, the gap between the lens barrel and the scroll chamber. It is possible to contribute to the transformation.

  However, in order to further reduce the size of the lens-fitted photo film unit, it is very difficult to simply use a conventional standard battery and devise its component arrangement. Therefore, as a new device for reducing the size of the lens-fitted photo film unit, it is considered to use a battery dedicated to the lens-fitted photo film unit having a size different from that of the conventional single, three- and four-inch standards. That is, by using such a dedicated battery, it is possible to improve the battery storage space and the efficiency of the arrangement of internal components, and to reduce the size of the lens-fitted photo film unit.

  By the way, the above-described lens unit with a lens is designed so that most of its constituent parts are recycled, and an authorized manufacturer who has manufactured a lens unit with a lens has most components including a strobe device for recycling. Parts are disassembled, cleaned and inspected before being put back into the production line. Thereby, the quality of the recycled film unit with a lens is maintained at a high quality which is not different from that of a newly manufactured lens unit with a lens.

  On the other hand, in the film unit with a lens currently on the market, a third party different from the authorized manufacturer that manufactured the unit body, on the used unit body after taking out the photographed film cartridge, There is a so-called refill product in which unused photographic film is reloaded as it is and consumable parts such as batteries are replaced with new ones for sale.

  The so-called refill products that are illegally reused by a third party different from the authorized manufacturer are sold without proper inspection and repair, and are therefore unreliable. is there. Furthermore, problems that occur in refilled products damage the reliability of the film unit with lens itself. In addition, since the above-mentioned promotion of recycling by the manufacturer is also hindered, a device for preventing the reuse of the lens-fitted photo film unit is required.

  Accordingly, in order to reduce the size of the lens-fitted photo film unit described above and to prevent unauthorized use of refilling, it is required to use a battery dedicated to the lens-fitted photo film unit and take effective preventive measures. That is, by using such a dedicated battery, it is difficult to incorporate a single or four-inch standard dry battery even if the dedicated battery is removed from the lens-fitted photo film unit, so that refill use can be prevented. Furthermore, it is possible to reduce the environmental load by using a small dedicated battery.

  However, when using a dedicated battery, especially when using a dedicated battery with a smaller capacity than conventional AA or AAA standard batteries, the current supplied from the dedicated battery must be consumed without waste. However, it has not been considered so far to incorporate a dedicated battery in a lens-fitted photo film unit, and there has been no ingenuity to efficiently use a special battery with a small capacity.

In Patent Document 2, an insulating member such as an insulating tape provided integrally with the packaging bag is provided between one electrode of a battery incorporated in the unit body and an electrode contact piece corresponding to this electrode. A lens-equipped film unit that is configured to prevent energization of the strobe device when it is sandwiched and unused is described, and it may be possible to prevent wasteful consumption of the dedicated battery by providing such an insulating member, but the lens During the assembly of the attached film unit, a process of sandwiching the insulating member between the electrode of the dedicated battery and the electrode contact piece must be performed, which complicates the assembly process and lowers the production efficiency.
JP-A-10-254033 JP-A-6-43592

  The problem to be solved is that the lens unit with a lens that has a dedicated battery with a different size from the dry battery that conforms to the conventional standard cannot use the dedicated battery efficiently, shortening the product life and When an insulating member that prevents energization of the battery is used, the production efficiency is lowered.

  In the present invention, an unexposed photographic film cartridge is loaded, a battery serving as a power source is built in, a circuit board to which current is supplied from the battery, and a switching operation for switching the on / off state of the circuit board In a film unit with a lens provided with a unit main body in which a member is incorporated, a dedicated battery is used as the battery, and is attached to the unit main body when not in use to prevent the switching operation of the switching operation member. A switching prevention member that is removed from the unit main body and allows the switching operation of the switching operation member is provided. The switching prevention member is attached to the unit body so as to cover the switching operation member or the interlocking member that moves in conjunction with the switching operation of the switching operation member. Furthermore, the switching prevention member is formed integrally with an exterior sheet that covers the unit main body.

  Further, in the present invention, an unexposed photographic film cartridge is loaded, a battery serving as a power source is built in, an electrode contact piece connected to both electrodes of the battery, and the electrode contact piece is connected to the battery. In a film unit with a lens provided with a unit body in which a circuit board to which current is supplied via an electrode contact piece is incorporated, a dedicated battery is used as the battery, and the battery and the electrode are externally provided from the unit body. Insulating member having rigidity that can be inserted between the contact piece, inserted between the battery and the electrode contact piece when not in use to prevent electrical connection, and removed from the unit body when in use. An insulating member that allows electrical connection between the battery and the electrode contact piece is provided. The insulating member is formed integrally with a protective member that protects the unit body when not in use.

  The lens-fitted photo film unit of the present invention uses a dedicated battery as a power source built in the unit body, enabling the unit body to be downsized and preventing refilling, while using the dedicated battery without waste. There is an advantage that the product life can be extended and an assembly process can be easily performed.

  FIG. 1 is an external perspective view of a lens-fitted photo film unit embodying the present invention. The lens-fitted photo film unit 2 includes a unit main body 3 in which various photographing mechanisms are incorporated, and an exterior sheet 4 that partially covers the unit main body 3. The exterior sheet 4 is formed from, for example, cardboard. On the front surface of the unit main body 3, a photographing lens 5, an objective finder window 6, a strobe light emitting unit 7, a strobe switching operation member 8, and the like are provided. A release button 11, a counter window 12 for displaying the number of remaining frames that can be photographed, and a light guide 13 for strobe charge display are formed on the upper surface of the unit body 3. Further, on the back side of the unit main body 3, a winding knob 14, an eyepiece finder window, and the like are exposed.

  The strobe switching operation member 8 is for switching an on / off state of a strobe device 15 to be described later. When the strobe switching operation member 8 is in a normal position (lower side in the figure), the strobe device 15 is in an off state, When the strobe switching operation member 8 is slid to the charging position (upper side in the figure), the strobe device 15 is turned on and charging is started.

  As shown in FIG. 2, the unit main body 3 includes a main body base 19 in which the light guide 13 and the strobe device 15 exposure device 16 are incorporated, a front cover 20 attached so as to cover the front and rear of the main body base 19, and a rear cover 21. It consists of and. The front cover 20 is formed with openings for exposing the photographing lens 5, the objective-side finder window 6, the strobe light emitting unit 7, the strobe switching operation member 8, and the like.

  The main body base 19 is integrally formed with a cartridge chamber 22 and a film roll chamber 23 on the left and right sides, and an aperture 24 (see FIG. 3) positioned therebetween. An exposure device 16 is provided in front of the aperture 24. It has been. A strobe device 15 is attached between the exposure device 16 and the film roll chamber 23 by claw coupling. Furthermore, a film roll 26a in which a film cartridge 25 and a photographic film 26 are rolled are loaded in the cartridge chamber 22 and the film roll chamber 23, respectively. A winding knob 14 is rotatably disposed at the upper portion of the cartridge chamber 22, and a shaft member integrally provided at the lower portion thereof is engaged with a spool 25 a of a film cartridge 25 housed in the cartridge chamber 22. The photographed photo film 26 is wound up into the film cartridge 25 by rotating the winding knob 14 counterclockwise in the drawing.

  The rear cover 21 is attached so as to cover the back surface of the main body base 19, and forms a film feeding path from the film roll chamber 23 through the back of the aperture 24 to the cartridge chamber 22 with the main body base 19. To do. The photographic film 26 is stored in the film cartridge 25 loaded in the cartridge chamber 22 from the film roll chamber 23 through the film feeding path. Further, bottom covers 21a and 21b are formed on the bottom of the rear cover 21, and the bottoms of the cartridge chamber 22 and the film roll chamber 23 are light-tightly closed by these bottom covers 21a and 21b.

  As shown in detail in FIG. 3, the strobe device 15 is a unit obtained by assembling a strobe light emitting section 7, a main capacitor 31, a sync switch 32, a pair of electrode contact pieces 33, 34, etc. on a circuit board 30. On the back side of the circuit board 30, a light-emitting element 35 for displaying the completion of charging is mounted and starts blinking when the main capacitor 31 is charged.

  A receiving plate 37 and a strobe switching operation member 8 are attached to the front surface of the circuit board 30. When the strobe switching operation member 8 is slid from the normal position toward the upper charging position, a protrusion (not shown) formed on the back side of the strobe switching operation member 8 is provided on the circuit board 30. When the metal contact piece 30a is pressed, the strobe circuit is turned on and charging of the main capacitor 31 is started. In the strobe device 15, the synchro switch 32 is short-circuited by shutter blades (not shown) that rotate when the shutter mechanism is operated, so that strobe light is emitted.

  The pair of electrode contact pieces 33 and 34 is connected to one end of the circuit board 30, and a dedicated battery (hereinafter simply referred to as a battery) 41 is attached to supply power to the strobe circuit. The electrode contact piece 33 on the positive electrode side and the electrode contact piece 34 on the negative electrode side are all made of a metal plate and are bent to contact the positive electrode terminal 42 and the negative electrode terminal 43 of the battery 41, respectively, and hold the battery 41 by elasticity. The battery 41 is held below the aperture 24 by being held by the electrode contact pieces 33 and 34 and being fixed to the main body base 19 together with the strobe device 15.

  The battery 41 is a battery dedicated to the lens-fitted photo film unit, and has a size different from that of the conventional standard, for example, single 3 and single 4 type batteries. As shown in FIGS. 4 and 5, the battery 41 includes first to third positive electrode materials 44 a to 44 c, a negative electrode material 45, a separator 46, and a case 47 that encloses these.

  The positive electrode members 44 a to 44 c are sealed in a state where they are stacked in three stages so as to be coaxially positioned inside the case 47. Among the positive electrode materials 2a to 2c, the first positive electrode material 44a and the second positive electrode material 44b are both formed to have the same outer dimensions, that is, the outer diameter D, the inner diameter d, and the axial length L1 are the same. Yes. The third positive electrode material 2c has the same outer diameter D and inner diameter d as the first and second positive electrode materials 44a and 44b, but its axial length L2 is the axis of the first and second positive electrode materials 44a and 44b. The dimension is shorter than the length L1.

  The case 47 includes a case main body 48 and a sealing member 49. The case main body 48 is formed by pressing a steel plate or the like, and is formed in a substantially cylindrical shape in which one end (positive electrode side) is closed and the other end (negative electrode side) is opened. The sealing member 49 seals the negative electrode side of the case body 48. One end of the case body 48 is integrally provided with a positive terminal 42 that protrudes along the axial direction and is formed in a small disk shape.

  The separator 46 is fitted into the positive electrode materials 44a to 44c, and the negative electrode material 45 is filled therein. The sealing member 49 includes a negative electrode current collector 51, a sealing plate 43 that also serves as a negative electrode terminal, a gasket 53, and a cap 54. A cap 54 is fitted on the negative electrode side of the gasket 53. Further, the sealing plate 52 is in contact with the cap 54. When the sealing member 49 is attached to the case main body 48, the end edge portion of the case main body 48 is folded back and engaged with the sealing plate 43. As a result, the negative electrode side of the case body 8 is sealed by the sealing member 49.

  The gasket 53 constituting the sealing member 49 is preferably formed from a known hydrogen permeable filter such as a porous polyurethane foam. By forming the sealing member 49 from a material having hydrogen permeability, hydrogen gas generated from the negative electrode material 45 permeates through the gasket 53 and flows to the outside, so that an alkali adapted to the conventional standard is used. There is no need to provide a space for storing hydrogen inside the battery as in the case of the battery, and the negative electrode material 45 or the positive electrode materials 44a to 44c can be filled up to the capacity limit of the case 47 without waste.

  Further, a label 55 for indicating a product name, a pattern, or the like is affixed to the surface of the battery 41. As shown in FIG. 3, the label 55 is a battery dedicated to a film unit with a lens. A note 55a for marking is marked. Further, the label 55 is marked with a “+” symbol 55b to indicate the positive terminal side and a “−” symbol 55c to indicate the negative terminal side. The battery 41 is formed, for example, with a shorter axial length than that of a conventional AA battery. That is, it is preferable that the outer dimensions of the battery 41 are formed so as to have a diameter of 9 mm or more and 15 mm or less and an axial length of 40 mm or less. By using the battery 41 dedicated to such a lens-fitted photo film unit, the unit body 3 can be reduced in size and prevented from being refilled.

  As shown in detail in FIG. 3, the light guide 13 is formed of a transparent plastic, and includes a mounting portion 61 including a cylindrical mounting hole and a guide portion 62 that internally reflects light from the light emitting element 35. Is done. The attachment portion 61 is slidably attached to a guide pin 63 formed integrally with the main body base portion 19. A pin 64 is integrally formed on the front surface of the mounting portion 61 and is sandwiched between the sandwiching portions 8 a of the strobe switching operation member 8. As a result, the light guide 13 is interlocked with the strobe switching operation member 8, and a part of a guide portion 62 described later protrudes from the upper surface of the unit body 3 when the main capacitor 31 is charged.

  The guide portion 62 has an incident surface 62a and an exit surface 62b. In the guide portion 62, when the strobe switching operation member 8 is slid upward, the incident surface 62 a faces the light emitting element 35 and the emission surface 62 b protrudes from the upper surface of the unit body 3. The light of the light emitting element 35 incident from the incident surface 62a is reflected inside the light guide 13 and emitted to the outside from the emission surface 62b. For this reason, the photographer can confirm the completion of charging from the light of the light emitting element 35 emitted through the light guide 13.

  FIG. 6 is an external perspective view of the lens-fitted film unit 2 in a product state packaged in a package 65. FIG. The packaging body 65 includes a gusset bag 66 and a tray 67. The tray 67 is made of, for example, thick paper, and is formed in a U shape so as to surround the front surface, the top surface, and the bottom surface in order to protect the lens-fitted photo film unit 2 from an impact or the like. The gusset bag 66 is formed in a cylindrical shape, and the lens-fitted film unit 2 covered with the tray 67 is housed inside, and both ends are sealed by heat welding.

  In the unused product state, the exterior sheet 4 is integrally formed with switching blocking pieces 68 and 69 as switching blocking members via the perforation 70. The switching blocking pieces 68 and 69 hold the switching blocking state of the lens-fitted film unit 2 when not in use.

  The switching prevention piece 68 is formed so as to protrude from the exterior sheet 4 toward the strobe switching operation member 8, and when not in use, the switching prevention piece 68 completely covers the strobe switching operation member 8. The switching operation between the normal position and the charging position is prevented.

  The switching prevention piece 69 is located on the upper surface of the exterior sheet 4, and the entire periphery is surrounded by the perforation 70. This switching prevention piece 69 covers the upper side of the light guide 13 when not in use. As a result, the light guide 13 can be prevented from sliding from the inside of the unit body 3 to the protruding position where the light guide 13 protrudes to the outside. Further, since the slide movement of the light guide 13 is blocked, the slide movement of the strobe charging switch 8 that is interlocked with the light guide 13 is also blocked simultaneously.

  In addition, as a gusset bag 66 which comprises the package body 65, a material with high hydrogen permeability is used. As a result, the hydrogen gas flowing out from the battery 41 permeates through the gusset bag 66 and flows out, so that the gusset bag 66 is not filled with hydrogen gas. Further, the configuration of the gusset bag 66 is not limited to this, and may be one in which an opening for hydrogen gas outflow is formed.

  The operation of the above configuration will be described below. The lens-attached film unit 2 assembled in the assembly factory is held in the switching blocking state by the switching blocking pieces 68 and 69 as described above. Then, the lens-fitted photo film unit 2 in which the switching prevention state is held is surrounded by the tray 67 and further wrapped in a gusset bag 66 to be in a product state. The lens-fitted photo film unit 2 in the product state is transported from the assembly factory to various dealers and arranged in the store. In this distribution process, even if the lens-fitted photo film unit 2 falls or is subjected to vibrations, an on / off switching operation of the strobe switching operation member 8 is blocked by the switching blocking pieces 68 and 69. Therefore, the strobe device 15 is never turned on. That is, since the strobe device 15 in the off state does not receive power from the battery 41, it is possible to prevent unnecessary consumption of the battery 41 and extend the product life.

  The lens-fitted photo film unit 2 purchased by the user from the store is taken out from the gusset bag 66. Then, when the user takes a picture, the switching prevention pieces 68 and 69 are removed from the lens-fitted photo film unit 2 as shown in FIG. Since the switching blocking pieces 68 and 69 and the exterior sheet 4 are connected via the perforation 70, they can be easily removed along the perforation 70. Since the strobe switching operation member 8 and the light guide 13 are exposed in the film unit 2 with a lens from which the switching blocking pieces 68 and 69 have been removed, the on / off switching operation of the strobe device 15 is allowed and strobe photography is performed. Is possible.

  In the above example, the switching prevention pieces 68 and 69 are formed integrally with the exterior sheet 4 and removed along the perforation 70, but the present invention is not limited to this. The same effect as in the above example can be achieved by using a separate member and attaching the unit main body 3 detachably with an adhesive tape or the like to prevent the movement of the strobe switching operation member 8 or the light guide 13. Can be obtained. Moreover, it is good also as a structure which fixes the switching prevention member comprised with the member different from a tray to the inner surface side of a gusset bag by adhesion | attachment or welding.

  In the first embodiment, the switching prevention member is provided to prevent power supply from the dedicated battery 41 to the strobe device 15 to prevent wasteful use of the dedicated battery 41. However, the present invention is not limited to this. It is not a thing. In the following, a second embodiment of the present invention in which useless use of the dedicated battery is prevented with another configuration will be described. In addition, when the member and components similar to the said 1st Embodiment are used, description is abbreviate | omitted using a same sign.

  FIG. 8 is an external perspective view of a lens-fitted photo film unit according to the second embodiment of the present invention. The lens-attached film unit 71 includes a unit main body 73 in which various photographing mechanisms are incorporated, and an exterior sheet 74 that partially covers the unit main body 73.

  As shown in FIG. 9, the unit main body 73 includes a main body base 19, and a front cover 77 and a rear cover 78 that are attached so as to cover the front and rear of the main body base 19. A strobe device 15 is incorporated in the main body base 19, and a dedicated battery 41 is used as a power source of the strobe device 15 as in the first embodiment. The bottom cover 78a, 78b is formed in the bottom part of the rear cover 78, and the bottom part of the cartridge chamber 22 and the film roll chamber 23 is light-tightly closed by these bottom covers 78a, 78b. Further, an insertion opening 81 for inserting an insulating member 80 described later is formed in the bottom wall 78c of the rear cover 78.

  FIG. 10 is an external perspective view and a cross-sectional view of the main part when the lens-fitted photo film unit 71 is in a product state packaged in a package. As shown in FIG. 11, the packaging body 85 includes a gusset bag 66 and a tray 86. The tray 86 is made of cardboard, for example. The tray 86 includes a rectangular front wall 87, and a top wall 88 and a bottom wall 89 that are continuous from above and below the front wall 87 and are bent at a right angle to the front wall 87. A protruding piece 80 as an insulating member is integrally formed on the bottom wall 89 of the tray 86.

  In the unused product state, the lens-fitted film unit 71 maintains the insulation state between the battery 41 and the electrode contact piece 33 by the protruding piece 80. The projecting piece 80 is located inside the unit main body 73 from the bottom wall 89 through the insertion opening 81 and is inserted between the positive terminal 42 of the battery 41 and the electrode contact piece 33, and the elastic force of the electrode contact piece 33. It is pinched by. Thereby, the electrical connection between the battery 41 and the electrode contact piece 33 is blocked. The protruding piece 80 is formed of a rigid member so that it can be inserted between the electrode contact piece 33 and the positive terminal 42.

  The operation of the above configuration will be described below. The lens-fitted film unit 71 assembled in the assembly factory is maintained in an insulated state by the protruding piece 80 formed integrally with the tray 86 as described above. At this time, since the protruding piece 80 is formed of a rigid member as described above, the protruding piece 80 can be easily inserted from the outside of the lens-fitted film unit 71 after the assembly is completed to be in an insulated state. Can do. The lens-attached film unit 71 surrounded by the tray 86 is further packaged in a gusset bag 66 to be in a product state. The lens-equipped film unit 71 in the product state is transported from the assembly factory to various sales outlets and arranged at the store. In this distribution process, even if the lens-fitted film unit 71 falls or is subjected to vibration and is subjected to an impact, the insulation state is maintained by the protruding piece 80, and the power supply from the battery 41 to the circuit board 30 is maintained. Has been stopped. Therefore, useless consumption of the battery 41 can be prevented and the product life can be extended.

  In the above example, the insulating member 80 is integrally formed with the tray 86. However, the insulating member 80 is not limited to this, and the insulating member may be formed of a member different from the tray, or may be a storage case as a package. If the storage case and the insulating member are integrally formed, the same effect can be obtained. Furthermore, in the above example, the insulating member 80 is configured to be inserted between the electrode of the battery 41 and the corresponding electrode contact piece. However, the position where the insulating member 80 is inserted is not limited to this, and the battery 41 may be any place where the energization is interrupted by inserting the insulating member 80 in the middle of the electrical path for supplying power from 41. For example, a contact portion that is electrically connected by contact with each other is provided, It is good also as a structure which interrupts | blocks the electricity supply from the battery 41 by inserting an insulating member.

  In the first and second embodiments, the description has been given by taking the substantially cylindrical dedicated battery 41 as an example, but the shape of the dedicated battery is not limited to this, for example, a part of the outer diameter is The thing with the shape with a level | step difference used as the thin cylindrical part can also be used.

It is an external appearance perspective view of the film unit with a lens to which the first embodiment is applied. It is a disassembled perspective view of a film unit with a lens. It is an external perspective view of a main body base and a strobe device. It is an external appearance perspective view of the battery unit exclusive battery with a lens. It is principal part sectional drawing of the battery unit exclusive battery with a lens. It is an external appearance perspective view of the film unit with a lens of the state packaged by the package. It is an external appearance perspective view which shows the film unit with a lens when removing a switching prevention piece. It is an external appearance perspective view of the film unit with a lens to which a 2nd embodiment is applied. It is a disassembled perspective view of a film unit with a lens. It is principal part sectional drawing of the film unit with a lens of the state packaged by the package. It is an external appearance perspective view which shows the structure of the film unit with a lens, and a package.

Explanation of symbols

2 Film unit with lens 3 Unit body 4 Exterior sheet 41 Battery dedicated to film unit with lens 65 Packaging body 66 Gusseted bag 67 Tray 68, 69 Switching blocking piece 80 Insulating member

Claims (5)

An unexposed photographic film cartridge is loaded, a battery is built in as a power source, a circuit board to which current is supplied from the battery, and a switching operation member for switching the on / off state of the circuit board are incorporated. In the film unit with a lens provided with the unit body,
Switching that uses a dedicated battery as the battery, is attached to the unit main body when not in use to prevent the switching operation of the switching operation member, and is removed from the unit main body when used to allow the switching operation of the switching operation member A film unit with a lens, wherein a blocking member is provided.   The lens according to claim 1, wherein the switching prevention member is attached to the unit main body so as to cover the switching operation member or an interlocking member that moves in conjunction with a switching operation of the switching operation member. Film unit with.   3. The lens-fitted photo film unit according to claim 2, wherein the switching prevention member is formed integrally with an exterior sheet that covers the unit main body. An unexposed photographic film cartridge is loaded, a battery serving as a power source is built in, an electrode contact piece connected to both electrodes of the battery, and this electrode contact piece is connected, and from the battery through the electrode contact piece In a film unit with a lens having a unit body in which a circuit board to which a current is supplied is incorporated,
A dedicated battery is used as the battery, and an insulating member having rigidity that can be inserted between the battery and the electrode contact piece from the outside of the unit body is provided, and when the battery is not used, the battery and the electrode contact piece A lens-fitted photo film unit provided with an insulating member inserted between them to prevent electrical connection and removed from the unit main body during use to allow electrical connection between the battery and the electrode contact piece .   5. The lens-fitted photo film unit according to claim 4, wherein the insulating member is formed integrally with a protective member that protects the unit body when not in use.