JPH09281654A - Film unit with lens - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent electric shock in a stroboscopic unit caused by the infiltration of electrolytic solution such as seawater by performing waterproofing and insulating to a part where the metallic case of a capacitor is exposed to the outside from a sleeve. SOLUTION: A cylindrical aluminum electrolytic capacitor is used as a main capacitor 48, which is constituted of the metallic case 48a made of aluminum inside which an aluminum foil for storage is housed, a terminal 48b projected from one end face of the case 48a and sealed by a rubber sealing material, and the sleeve 59 made of vinyl chloride with which the outside of the case 48a is covered. The end face on a side where the terminal 48b of the main capacitor 48 does not exist is not covered with the sleeve 59 but coated with insulating material 60 having water proofing property, so that the case 48a is not exposed to the outside. Coating agent (rubber, fluororesin, etc.) and adhesive (UV curing resin, hot melt, etc.) are used as the insulating material 60.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens-fitted photo film unit, and more particularly to an improvement of a lens-fitted photo film unit having a built-in strobe unit.

[0002]

2. Description of the Related Art Some of the lens-fitted photo film units, which are sold with a simple photographing mechanism preloaded with an unexposed photo film and a cartridge, have a strobe function. Such a lens-fitted film unit includes an exposure unit in which a taking lens, a shutter mechanism, etc. are integrated, a strobe unit, and the exposure unit and the strobe unit are assembled together.
A main body base into which a photographic film and a cartridge are loaded,
It is composed of a front cover and a rear cover that cover the front surface and the back surface of the main body base.

The strobe unit comprises a strobe light emitting portion including a discharge tube and a circuit board on which a strobe circuit for emitting the strobe light is formed, and a charging operation button provided on the front surface of the lens-fitted film unit is pressed. Converts the DC current supplied from the power supply battery into AC,
This alternating current is boosted to around 300 V, converted into direct current again, and applied to the main capacitor for charging. And
The discharge tube is caused to emit light by the current charged in the main capacitor due to the generation of a trigger at the time of shutter release.

A cylindrical aluminum electrolytic capacitor is used as the main capacitor. This aluminum electric field capacitor uses a metal case made of aluminum for the exterior, and since this metal case is electrically connected to the internal electrolytic flow, it has substantially the same potential as the negative terminal. Further, the strobe unit has a simplified circuit configuration for cost reduction, and the positive side terminal of the main capacitor is connected to the negative side of the power battery. Therefore, if you simultaneously touch the metal case of the main capacitor and the metal contact that contacts the negative pole of the power battery,
In some cases, a voltage of around 00V caused an electric shock.

In order to prevent such a risk of electric shock,
The exterior surface of the lens-fitted film unit is marked with caution not to disassemble the lens-fitted film unit carelessly, and the outside of the metal case is covered with a vinyl chloride sleeve for insulation. The used aluminum electrolytic capacitor is used. For mass production reasons, both end surfaces of the aluminum electrolytic capacitor in a cylindrical shape are not covered with sleeves.

[0006]

However, since recent film units with lenses have been miniaturized, the gap between the joint between the front cover and the rear cover and the built-in parts is very small. It is getting smaller. Therefore, if electrolyte solution such as seawater permeates from the joint between the front cover and the rear cover, the main capacitor and
Seawater may reach the negative pole of the power battery. There is no problem if the metal case of the main capacitor is covered and insulated by the sleeve, but for mass production reasons, both ends of the cylindrical shape of the aluminum electrolytic capacitor are not covered by the sleeve. When the seawater reaching the main condenser and the seawater reaching the power supply battery are touched at the same time in this state, an electric shock may be caused by a voltage of about 300V.

The present invention is intended to solve the above problems, and provides a lens-fitted film unit which prevents electric shock in a strobe unit due to infiltration of an electrolytic solution such as seawater.

[0008]

In order to solve the above problems, a film unit with a lens according to claim 1 is provided.
The part where the metal case of the capacitor is exposed from the sleeve is waterproof and insulated.

In the lens-fitted film unit according to the present invention, waterproofing and insulating treatment is carried out by coating a waterproof insulating material, or sticking a waterproof and insulating adhesive tape, or Each of the caps is made of a waterproof and insulating material.

Further, the lens-fitted photo film unit according to a fifth aspect of the present invention uses a capacitor in which a metal case is entirely covered with an insulating material having a waterproof property in the strobe unit.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a film unit with a lens according to the present invention will be described below with reference to the accompanying drawings. FIG. 2 is an advanced photo.
1 shows the appearance of a lens-fitted film unit 2 compatible with System (APS). The lens-fitted film unit 2 includes a unit main body 3 in which a film cartridge is loaded in advance and various photographing mechanisms are incorporated.
And an exterior paper 4 partially covering the unit main body 3.

A shutter button 6 and a counter window 7 are provided on the upper surface of the unit body 3, and a finder 8, a photographing lens 9, a strobe charging operation button 10, and a strobe light emitting unit 1 are provided on the front.
1 and the like are provided. Also, a winding knob 12 that is rotated from one frame to another is exposed from the rear side. The exterior paper 4 is coated with an adhesive on the back surface and is attached so as to be wound around the central portion of the unit body 3, and an opening for exposing the taking lens 9, the finder 8, the counter window 7, etc. to the outside is formed.

As shown in FIG. 3, the unit main body 3 includes a main body base 16 into which the film cartridge 14 is loaded,
An exposure unit 17 and a strobe unit 18 mounted on the front surface of the main body base 16 and a front cover 19 mounted so as to cover the front and back sides of the main body base 16.
And a rear cover 20. These are assembled by pawl engagement.

The film cartridge 14 comprises a plastic cartridge body 22 and a photographic film 23 housed in the cartridge body 22. A photo film 23 is provided in the cartridge body 22.
A spool 25 to which one end is locked is rotatably incorporated, and further has a built-in film sending mechanism as disclosed in JP-A-6-266053. Also,
A bar-shaped light-shielding lid 26 that opens and closes the film entrance and exit by being rotated from the outside is incorporated in a film entrance and exit (not shown) through which the photo film 23 enters and exits the cartridge main body 22 instead of the conventional telephone. I have.

The APS-compatible photographic film 23 has two large and small perforations 28 and 29 having different sizes alternately arranged at two types of intervals along one side edge. The perforations 28 and 29 are used to set the leading and trailing sides of each frame 30 in the film feeding direction.
In the lens-fitted film unit 2, the photographic film 23 is wound into the cartridge body 22 every time the image is taken, so that the large perforation 28 indicates the leading side in the film feeding direction and the small perforation 29 indicates the rear side. The perforations 28 and 29 are provided in the number corresponding to the number of the tops 30.

At the center of the main body 16, there is provided a light-shielding tube 34 for shielding the photographing optical path from the exposure unit 17 mounted on the front side to the photographic film 23. On the back side of the light-shielding cylinder 34, an aperture for defining an exposure range for the photographic film 23 is formed.
A film support surface 20a is formed on the rear cover 20 so as to face the aperture. On the front side of the light-shielding tube 34, an opening 38 for guiding the subject light transmitted through the photographing lens 9 to the aperture is formed. Also,
An opening 34 a for exposing a sprocket incorporated in the exposure unit 17 toward the photographic film 22 is formed above the light shielding cylinder 34.

On both sides of the light-shielding tube 34, a cartridge chamber 36 and a film roll chamber 37, in which the cartridge body 22 and the photo film 23 are rolled in a manufacturing process, are housed, respectively. Is formed.

The cartridge chamber 36 and the film roll chamber 37 have a rear cover 20 attached to the rear side of the main body base 16 and a bottom lid 39 for the cartridge chamber integrally formed with the rear cover 20, and a film roll chamber 37 for the film roll chamber. By closing the bottom cover 40, an appropriate light-shielding ability can be obtained. In addition,
The bottom covers 39 and 40 are connected to the rear cover 20 via a flexible thin portion, and the bottom cover 39 is used to move the film cartridge 1 from the lens-equipped film unit 2 after use.
It is opened when 4 is taken out.

The hoisting knob 12 is rotatably mounted on the upper part of the cartridge chamber 36. The hoisting knob 12 has a gear formed on the outer periphery, and a drive shaft formed on the lower surface is engaged with a spool 25 of the cartridge body 22. The photo film 22 is wound up by the spool 25 by being rotated counterclockwise in the drawing every time one frame is shot. Further, the winding knob 12 is prevented from rotating in the reverse direction by engaging the check claw 42 formed on the upper surface of the cartridge chamber 36 with the gear.

Although not shown, the cartridge chamber 36
When the film cartridge 14 is taken out of the cartridge chamber 36, a light-shielding lid closing mechanism that closes the light-shielding lid 26 in conjunction with opening of the bottom lid 39 is incorporated in the upper surface and the side surfaces of the cartridge.

The exposure unit 17 has a shutter charging mechanism, a film winding stopping mechanism, a counter feeding mechanism, a shutter driving mechanism and shutter blades, and a photographing lens 9 as in the case of a conventional lens-fitted film unit using a 135-size photographic film. In addition to the above, the objective lens and the eyepiece lens constituting the finder 8 are unitized.
Further, the exposure unit 17 is provided with a sprocket that meshes with the perforations 28 and 29 of the photographic film 23 through the opening 34a in the upper portion of the light-shielding cylinder 17 and is rotated by the transfer of the photographic film 23. The sprocket serves as a drive source for the above-described shutter charging mechanism, film winding mechanism, and counter feed mechanism.

The strobe unit 18 is composed of a circuit board 44 provided with a strobe circuit, and a strobe light emitting section 11 assembled to the circuit board 44. As shown in FIG. 1, the strobe light emitting section 11 includes a discharge tube 45 that emits strobe light, a reflector 46 that reflects the light emitted from the discharge tube 45 toward a subject, and diffuses the light from the discharge tube 45. The diffusion plate 11a and the holding member 11b attached to the circuit board 44 while holding the diffusion plate 11a are exposed to the outside through the light emitting portion opening 19a formed in the upper portion of the front cover 19.

The circuit board 44 is provided with various electric components such as a main capacitor 48 forming a strobe circuit, a strobe charging switch 49 and a sync switch 50. The strobe charging switch 49 is a strobe charging operation button 10 formed on the front surface of the front cover 19.
This is a metal contact piece arranged on the back side of the strobe, and contacts the copper foil portion of the circuit board 44 by pressing the strobe charging operation button 10 to close the strobe circuit and perform strobe charging. The synchro switch 50 is composed of two switch pieces made of metal, and when pressed by the swing of a shutter blade incorporated in the exposure unit 17, the two switch pieces come into contact with each other to emit strobe light.

A plus side metal contact piece 53 and a minus side metal contact piece 54 for connecting the plus electrode 52b and the minus electrode 52a of the power supply battery 52 to the strobe circuit are attached to the lower portion of the circuit board 44. There is. This power battery 52
Is disposed below the light shielding tube 34 of the main body base 16 while being held by the plus side metal contact piece 53 and the minus side metal contact piece 54, and the bottom lids 39, 40 provided on the rear cover 20.
And the bottom plate 41 protects the bottom surface side. The negative electrode 52a of the power supply battery 52 has a bottom cover 39 and a bottom plate 41.
Since it is located above the position where and, there is a possibility that it will reach when seawater or the like enters.

The strobe circuit formed on the circuit board 44 includes a strobe charging switch 49 as shown in FIG.
Is turned on, the current of the power supply battery 52 is converted to alternating current, then boosted up to around 300 V, converted again to direct current and applied to the main capacitor 48, and a trigger signal is generated by turning on the synchro switch 50. , And a trigger circuit 57 for emitting strobe light.

As shown in FIG. 1, a cylindrical aluminum electrolytic capacitor is used as the main capacitor 48, and a metal case 48a made of aluminum in which an aluminum foil for electricity storage is housed, and this metal case. Terminal 48b protruding from one end surface of 48a and sealed with a rubber sealing material
And a sleeve 59 made of vinyl chloride that covers the outside of the metal case 48a. In addition, the end surface of the main capacitor 48 on the side where the terminal 48b is not provided is a sleeve 59.
Insulation 60 not covered by water
Is coated so that the metal case 48a is not exposed to the outside.

The main capacitor 48 is connected to the circuit board 4
4 is assembled on the rear side of the film roll 4 and is arranged in the upper part of the film roll chamber 37 with the longitudinal direction thereof facing sideways. The end surface of the main capacitor 48 on the side where the terminal 48b is not present is the front cover 1
9 and the rear cover 20 are opposed to each other at the joint between the side walls 19b and 20b.

As the insulating material 60, a coating agent (rubber-based, fluororesin-based, black dye, etc.), adhesive (UV curable resin, hot melt, thermosetting resin, bond, etc.) can be used. The insulating material 60 may be coated by brushing, printing (silk, tampo), dispensing a fixed amount of liquid with a dispenser, spraying, or spraying.
A dip or the like can be used.

When a non-solvent type insulating material is applied by a dispenser, it is difficult to completely cover the exposed portion of the metal case 48a because of its high viscosity.
It is necessary to smooth the exposed surface of the metal case 48a to completely cover the exposed portion of the liquid after the liquid is discharged, or to warm the insulating material and the main capacitor 48 to lower the viscosity. Further, when a solvent-based insulating material is used, it takes time to cure, so it is preferable to perform forced drying by heating after application.

Further, although spray spraying has an advantage that it can be collectively processed, the viscosity of the insulating material is required to be low, and in order to process only a necessary portion, the main capacitor 4
It is also necessary to mask 8. Further, in the case of dipping, it is difficult to attach a certain amount of the insulating material, and since the liquid drips before the curing, it is necessary to pay attention to the posture of the main capacitor 48 during the curing. Furthermore, since the gap between the end surface of the main capacitor 48 and the side walls of the front cover 19 and the rear cover 20 is narrow, it is necessary to adjust the amount of the insulating material 60 applied so that the main capacitor 48 fits.

When the lens-fitted film unit 2 having the above-described structure is used at the seaside or the like and is handled by hand wet with seawater, for example, seawater may enter from the joint between the front cover 19 and the rear cover 20. There is. This lens-fitted photo film unit 2 has a front cover 1 for the purpose of downsizing.
Since the gap between the joint between 9 and the rear cover 20 and the built-in parts is very narrow, seawater that infiltrates from the joint reaches the power battery 52 and the main capacitor 48 by the capillary phenomenon. I may end up doing it.
However, the end surface of the main capacitor 48 has the insulating material 6
Since the metal case 48a is coated with 0 and the metal case 48a is not exposed to the outside, even if the seawater reaching the power supply battery 52 and the seawater reaching the main capacitor 48 are touched at the same time, there is no electric shock.

In the above-described embodiment, the portion of the metal case 48a of the main capacitor 48 exposed from the sleeve 59 is coated with the waterproof insulating material 60 by coating, spraying, or dipping. As shown in, the adhesive tape 63 having waterproofness and insulation may be attached to cover the metal case 48a. The adhesive of the adhesive tape 63 is not suitable for long-term use because water may infiltrate due to changes over time.

Further, as shown in FIG. 6, one end of the main capacitor 48 may be covered with a cap 65 formed of a waterproof and insulating material to cover the metal case 48a. The cap 65 may come off from the main condenser 48 when the lens-fitted film unit 2 is assembled, and further, water may enter through the gap between the cap 65 and the main condenser 48. It is advisable to adhere it to the main capacitor 48 with an agent or the like.

Further, as shown in FIG. 7, an aluminum electrolytic capacitor not covered by a sleeve is used as the main capacitor 67 used in the strobe unit 18, and a waterproof insulating material 68 is provided on the outside of the metal case 67a.
Can also be applied and coated by a method such as dipping. According to this, the cost of the main capacitor can be reduced by the amount corresponding to the sleeve, and more reliable waterproofness and insulation can be provided than in the above-described embodiments.

When the main capacitor 67 is coated with a dip or the like, the insulating material 68 drips, and if it hardens in that state, the projection 68a is generated. The position where the protrusion 68a faces the inner wall of the rear cover 20,
If it is in a position facing the holding member 11b, it will hinder the assembly of the lens-fitted photo film unit 2. In such a case, as shown in FIG.
Of the main capacitor 6 when the insulating material is hardened so that the projection 68a is formed at a position that does not interfere with other parts when assembled in the lens-fitted photo film unit 2 in the radial direction of.
Devise the storage posture of 7. Each of the waterproofing and insulating treatments described above can be appropriately selected according to the trade-off of man-hours and costs.

In each of the above-described embodiments, the APS compatible lens-fitted photo film unit has been described as an example, but the present invention can also be applied to a lens-fitted photo film unit loaded with a 135 size photographic film cartridge, a camera or the like. You can

[0037]

As described above, in the lens-fitted film unit of the present invention, the portion where the metal case of the capacitor is exposed from the sleeve is waterproofed and insulated, so that an electrolytic solution such as seawater is used. It is possible to prevent electric shock due to accidental connection between the metal case of the capacitor and the power supply battery via.

The waterproof and insulating treatments can be appropriately selected according to work efficiency, cost, etc., such as coating with a waterproof insulating material, adhering an adhesive tape, and covering with a cap.

Further, since the outside of the metal case of the capacitor without the sleeve is covered with the insulating material having the waterproof property so as to be used for the strobe unit, the cost of the capacitor is reduced, and more reliable waterproof property and insulating property are obtained. To be

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a main part of a strobe light emitting portion of a unit body.

FIG. 2 is a perspective view showing an appearance of a film unit with a lens.

FIG. 3 is an exploded perspective view showing a configuration of a unit main body.

FIG. 4 is a schematic diagram showing a configuration of a strobe circuit.

FIG. 5 is a cross-sectional view of a main part of another embodiment of a main capacitor which is waterproof and insulated.

FIG. 6 is a cross-sectional view of a main part of a main capacitor which is waterproof and insulated according to still another embodiment.

FIG. 7 is an external perspective view of a main capacitor which is waterproof and insulated according to still another embodiment.

8 is a cross-sectional view of a main part of a stroboscopic light emitting portion of a unit body in which the main capacitor shown in FIG. 7 is incorporated.

[Explanation of symbols]

 2 Film unit with lens 3 Unit body 18 Strobe unit 19 Front cover 20 Rear cover 44 Circuit board 48 Main capacitor 48a Metal case 59 Sleeve 60,68 Insulation 63 63 Adhesive tape 65 Cap

Claims (5)

[Claims] 1. An unexposed photographic film and a cartridge are pre-loaded, and a simple photographing mechanism such as a photographing lens and a shutter mechanism, and a condenser whose outside of a metal case is partially covered with an insulating sleeve are attached. A film unit with lens in which a strobe unit is incorporated, wherein a portion of the capacitor where the metal case is exposed to the outside is waterproofed and insulated. 2. The lens-fitted film according to claim 1, wherein the waterproof and insulating treatment is performed by coating a portion of the metal case exposed from the sleeve with a waterproof insulating material. unit. 3. The lens according to claim 1, wherein the waterproof and insulating treatment is performed by applying a waterproof and insulating adhesive tape to a portion of the metal case exposed from the sleeve. Film unit with. 4. The waterproof / insulating treatment is performed by covering one end of a capacitor having a metal case exposed with a cap formed of a material having waterproof / insulating properties. Item 1. A film unit with a lens according to item 1. 5. An unexposed photographic film and a cartridge are pre-loaded, and a simple photographing mechanism such as a photographing lens and a shutter mechanism and a condenser whose outside is covered with a waterproof insulating material are attached. A film unit with a lens, which has a built-in flash unit.