JPH10260505A - Film unit with lens and production of cover member therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the entering of dust into a cover member. SOLUTION: Light from a light emitting display element 44 arranged inside can be confirmed from the outside through a thin part 11 provided in a front cover 16, to prevent the entering of foreign matter. The thin part 11 is constituted so that its thickness is reduced by a recessed part 45 formed on the inside surface side of the front cover 16 and the light emitting display element 44 approaches the thin part 11. Thus, the display element 44 is arranged in proximity to the thin part 11, so that the light from the display element 44 efficiently radiates outside.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera in which a film is loaded in advance and a photographing mechanism incorporated therein is covered by a cover member formed of plastic, and the photographing mechanism is operated integrally with the cover member. And a method of manufacturing a cover member for the film unit with a lens provided with a pressing operation section for the same.

[0002]

2. Description of the Related Art There is a well-known film unit with a lens provided with a simple filming mechanism and incorporating a new film cartridge so that photographing can be easily enjoyed. This film unit with a lens is loaded with a film in a photographable state, and can be photographed by anyone simply by purchasing the film unit.

In a film unit with a lens, a part of a cover member covering a photographing mechanism is cut out, and a pressing operation unit is formed integrally elastically. With a strobe,
A display window is formed in the cover member. A light emitting display element for notifying the completion of charging of the main capacitor is incorporated therein, and light of the light emitting display element can be externally confirmed through a display window.

[0004]

The above-mentioned cover member is covered with a package having a decorative print on its surface. The package has an opening for exposing a display window and a pressing operation section. Is formed, foreign substances such as dust, sand, and water droplets easily enter from the display window or the notch. If these enter, there is a possibility that troubles may occur in the internal photographing mechanism, the flash device, and the like.

The present invention has been made in order to solve the above-mentioned drawbacks of the prior art, and it is intended to prevent foreign matter from coming from around a pressing operation unit provided integrally with a cover member or from a display window for confirming light of a light emitting display element. An object of the present invention is to provide a method of manufacturing a film unit with a lens that prevents intrusion and a cover member thereof.

[0006]

In order to achieve the above object, according to the first aspect of the present invention, a thin portion is formed on a cover member formed of plastic, and a light-emitting display element covered by the cover member is formed. The light is transmitted through the thin portion to be observed from outside the cover member. Claim 2
In the described invention, the thin portion is provided by forming a concave portion on the inner surface side or the outer surface side of the cover member, and the light emitting display element is provided close to the thin portion.

According to the third aspect of the present invention, the pressing operation unit integrally formed on the cover member formed of plastic is
The outer periphery is separated from the cover member by the slit while leaving a part, and the portion surrounded by the slit is configured to be pushed into the inside of the cover member, and the outer peripheral wall of the pressing operation unit separated by the slit or A thin dustproof wall extending in a band shape so as to cover the slit is formed integrally with at least one of the inner peripheral walls of the slit.

According to the fourth aspect of the present invention, after the cover member is formed in a state where the pressing operation portion is separated from the cover member by the concave groove while leaving a part of the outer periphery thereof, the pressing operation portion is pushed into the concave groove. The thin bottom wall is broken to impart operability to the pressing operation portion. Claim 5
In the invention described above, a break groove is formed in the bottom wall of the concave groove when the cover member is formed.

[0009]

Embodiments of the present invention will be described below. FIG. 5 is an external perspective view of a film unit with a lens. The film unit with a lens is provided with a simple photographing mechanism, and is a paper-made exterior obtained by folding a substantially rectangular unit main body 3 in which a new film cartridge is built in advance into a box shape with decorative printing applied to its surface. It is covered with body 4. From the openings provided in each part of the exterior body 4,
A photographing lens 6, a strobe light emission window 7, a strobe charge start button 8, a shutter button 9, an objective window 10, a thin portion 11 for strobe charge confirmation, and the like are exposed.

FIG. 6 is an exploded perspective view of the unit main body. The unit main body 3 includes an exposure unit 14 having a simple photographing mechanism, a main body base 15, and the main body base 15.
, A front cover 16 and a rear cover 17 that cover the front and rear, and a strobe unit 18 that is incorporated in the main body base 15 and covered by the front cover 16. Each part except the strobe unit 18 is formed of plastic.

A film roll chamber 21 and a cartridge chamber 22 are integrally formed on both sides of the main body base 15 with the aperture 20 interposed therebetween. In the film roll room 21,
The unexposed film 23 is stored in a roll form. The cartridge chamber 22 houses a cartridge 26 that houses the film 23 that has been photographed.

A winding knob 28 is provided above the cartridge chamber 22. The shaft of the winding knob 28 is connected to a spool 26 a rotatably incorporated in the cartridge 26.
The photographed film 23 is turned into the cartridge 26 by rotating in the direction of the arrow in the figure.
It is wound inside.

The film roll chamber 21 and the cartridge chamber 2
2, a dark box 30 is provided integrally. The exposure unit 14 is configured by integrating a photographic lens 6, a finder device 32, and the like on a base member 33, in addition to a film counter mechanism, a film unwinding mechanism, and a shutter mechanism. The exposure unit 14 is incorporated so as to cover the front surface of the dark box 30.

The front cover 16 is integrally provided with a shutter button 9, a charge start button 8, a thin portion 11, a projecting portion 34, and the like. The projecting portion 34 is formed so as to project along the side surface of the outer wall of the cartridge chamber 22 so as to reduce the overall thickness of the lens-fitted film unit to the outer diameter of the cartridge 26, and is used as a grip during photographing. At the bottom of the rear cover 17, pull-top lids 35 and 36 are provided integrally to cover the bottom openings of the film roll chamber 11 and the cartridge chamber 12, respectively.

The strobe unit 18 includes a pair of contacts 38
Circuit board 38 on which wiring print including a and 38b is performed
And electronic components. On the circuit board 38, a strobe light emitting portion 39, a battery holder 41 for holding a dry battery 40, a main capacitor 42 for strobe light emission, a synchro switch 43 composed of a pair of metal pieces, a light emitting display element 44 and the like are provided on the board surface. Assembled.

As shown in FIG. 1, when the front cover 16 is formed by injection molding, the thin portion 11 is formed on the inner surface of the front cover 16 by a concave portion 4.
5 so that light from the light emitting display element 44 passes through the thin portion 11 and is observed from outside the front cover 16. Light emitting display element 44
Is provided so as to enter the concave portion 45, and is brought close to the thin portion 11. Further, a concave portion 45 is formed on the outer surface side of the front cover 16, and the thin portion 11 is provided at a position facing the outer surface of the front cover 16 and outside the front cover, and the light emitting display element 44 is provided with the thin portion 11. May be arranged in close proximity to each other. Further, a cylindrical ridge may be formed so as to surround the concave portion 45 so that the light of the light emitting display element 44 does not leak.

When the charge start switch 8 is pressed,
The conduction member 45 short-circuits the contacts 38a and 38b, and charging of the main capacitor 42 is started. When a prescribed amount of charge is performed on the main capacitor 42, the light emitting display element 44 blinks. In response to the pressing operation of the shutter button 9, the pair of metal pieces of the synchro switch 43 are short-circuited in response to the opening and closing of the shutter blades, and strobe light is emitted from the strobe light emitting unit 39.

The operation of the above configuration will be described below. In the film unit with the lens, the thin portion 11 is formed integrally with the front cover 16, so that even when photographing in a dusty place such as a sandy beach, foreign matter such as sand is prevented from entering the thin portion 11. Is done. Since the thin portion 11 is formed so as to face the surface of the front cover 16, foreign matter does not accumulate in the thin portion 11. Further, the light emitting display element 4 is provided in the recess 45.
4 and the light emitting display element 44 is
, The light emitting display element 4 is efficiently arranged.
4 light is emitted outside.

The provision of the thin portion is not limited to the front cover.
Of course, it may be formed on the rear cover if necessary. Alternatively, the lever member constituting the film winding mechanism may be formed of a colored resin, and a thin portion for observing the colored lever member in a state where the film winding of one frame is completed may be formed.

Further, when the front cover 16 is formed, if the shutter button 9 is provided as shown in FIG. 2, foreign substances such as sand can be prevented from entering. The shutter button 9 has its outer periphery partially separated from the front cover 16 by a slit 48 except for a part thereof.
6. A thin dustproof wall 47 is integrally formed along the outer peripheral wall of the shutter button 9. The dustproof wall 47 is formed to extend in a belt shape, and the slit 48 is closed, so that intrusion of foreign matter is prevented.

A dustproof wall 47 is integrated with the shutter button 9.
The procedure for providing is shown below. The front cover 16 is formed such that a concave groove 49 is formed leaving a part of the outer periphery of the shutter button 9, and the front cover 16 is defined by the concave groove 49.
Then, by pressing the shutter button 9, the thin bottom wall of the concave groove 49 is cut, and operability is imparted to the shutter button 9. By this cutting, a thin dustproof wall 47 is integrally formed along the outer peripheral wall of the shutter button 9.

FIGS. 3A to 3D show examples of the groove 49 around the shutter button 9. In (A), since the width of the bottom wall of the concave groove 49a is wide, it can be broken with a small force. On the other hand, since the thin width is wide, the formability and the appearance of the fractured surface shape are slightly inferior. In (B), since a groove for breaking is provided on the bottom wall of the concave groove 49b, it can be cut well by pushing the shutter button 9. (C) requires a breaking force because the bottom wall of the concave groove 49c has a small thin width. (D) is excellent in formability since the concave groove 49d is formed by tapering toward the break portion. Therefore, when considering the easiness of breakage during assembly, it is desirable that (A) and (B) be able to cut l = 0.3 mm or more.

Further, as shown in FIG. 4, the shutter button 9 is covered by a cover portion 50 formed by extending a part of the exterior body 4 to prevent foreign matter from entering around the shutter button 9. Good. An opening 50a is formed in the cover 50, and the shutter button 9 is opened through the opening 50a.
Is partially exposed. The notch 50b provided around the opening 50a makes it easier for the shutter button 9 to be pressed.

In the above embodiment, the shutter button 9
In addition, the present invention can be applied to the strobe charging start button 8. Further, the exterior body 4 may be extended to cover the strobe charging start button 8. Note that the embodiment of FIG. 4 can be applied to a label sheet in which an adhesive is applied to the outer surface of the unit main body and the back surface is applied in a band shape.

The basic thickness of the front cover 16 is, for example, in the range of 0.8 mm to 1.2 mm. The thickness of the thin wall 11 and the bottom wall of the concave groove 49a provided on the front cover 16 is preferably 0.2 mm or less.

A plastic having a carbon concentration of about 0.8% is generally used for the front cover, the rear cover, and the base of the film unit with a lens. In the present invention, it was necessary to mold the front cover using a plastic having excellent light transmittance. In order to determine the most suitable plastic for molding the front cover having a thin portion, a light transmittance test was performed using two kinds of plastics having different carbon concentrations.

For example, when the thickness of the thin portion was 0.12 mm and the carbon concentration was about 0.15%, the light transmittance was about 5%. In addition, the thickness of the thin part is 0.15 mm.
When the carbon concentration was about 0.10%, the light transmittance was about 35%. It has been found that even if the thickness of the thin portion is increased, excellent light transmittance can be obtained by reducing the carbon concentration. When the light transmittance is about 35%, blinking can be sufficiently confirmed even in a bright room, and the latter is most suitable for implementation. Further, the same effect can be obtained when a low-concentration colored plastic that does not use carbon is used.

[0028]

As described above, according to the film unit with the lens of the present invention, the thin portion is formed on the cover member formed of plastic, and the light from the light emitting display element covered with the cover member is transmitted. Since the light is transmitted through the thin portion and is observed from the outside of the cover member, it is possible to prevent foreign matter from entering. According to the second aspect of the present invention, the light emitting display element is provided close to the thin part by forming the thin part in the inner surface side or the outer surface side of the cover member so that light from the light emitting display element can be efficiently emitted. Can be released outside.

The pressing operation portion integrally formed with the cover member formed of plastic is separated from the cover member by a slit except for a part of its outer periphery, and a portion surrounded by the slit is formed inside the cover member. Along with at least one of the outer peripheral wall of the pressing operation portion or the inner peripheral wall of the slit separated by the slit, a thin dustproof wall extending in a band shape so as to cover the slit is integrally formed. Since it is formed, intrusion of foreign matter from around the pressing operation portion is prevented.

According to the method of manufacturing a cover for a lens-fitted film unit of the present invention, the cover is formed in a state in which the pressing operation portion is separated from the cover member by a concave groove except for a part of the outer periphery thereof, and then the pressing member is pressed. Since the thin bottom wall of the concave groove is broken by pushing the operating portion to provide operability to the pressing operating portion, the dustproof wall can be provided at low cost. In addition, since the groove for rupture is formed in the bottom wall of the concave groove when the cover member is formed, the rupturability of the bottom wall is excellent, and a good dustproof wall can be formed.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a thin portion of a front cover of a film unit with a lens according to the present invention.

FIG. 2 is an explanatory diagram showing how a shutter button is formed.

FIG. 3 is another example of a concave groove of a shutter button.

FIG. 4 is a perspective view of a main part when a shutter button is covered by a part of a package;

FIG. 5 is an external perspective view of a film unit with a lens.

FIG. 6 is an exploded perspective view of a unit main body.

[Explanation of symbols]

 8 Strobe charging start button 9 Shutter button 11 Thin part 44 Light emitting display element

Claims (5)

[Claims] 1. A lens-equipped film unit in which a film is loaded in advance and a light-emitting display element incorporated therein is covered by a cover member molded of plastic, wherein a thin portion is formed in the cover member, A film unit with a lens, wherein light from the light emitting display element is transmitted through the thin portion and is observed from outside the cover member. 2. The light-emitting display device according to claim 1, wherein the thin portion is provided by forming a concave portion on the inner surface side or the outer surface side of the cover member, and the light emitting display element is provided close to the thin portion. Film unit with lens. 3. A film is loaded in advance, a photographing mechanism incorporated therein is covered by a cover member formed of plastic, and a pressing operation section for operating the photographing mechanism is integrated with the cover member. In the formed film unit with the lens, the pressing operation portion is configured such that an outer periphery thereof is separated from the cover member by a slit while leaving a part thereof, and a portion surrounded by the slit is pressed into the inside of the cover member. In addition, a thin dustproof wall extending in a band shape so as to cover the slit is formed integrally with at least one of the outer peripheral wall of the pressing operation portion separated by the slit and the inner peripheral wall of the slit. Film unit with lens. 4. A film is loaded in advance, and a photographing mechanism incorporated therein is covered by a cover member formed of plastic, and a pressing operation unit for operating the photographing mechanism integrally with the cover member is provided. The method of manufacturing the cover member of the provided film unit with a lens, comprising: forming the cover member in a state where the pressing operation unit is separated from the cover member by a concave groove while leaving a part of its outer periphery; A method for manufacturing a cover member for a film unit with a lens, characterized in that a thin bottom wall of the concave groove is broken by pushing an operation portion to impart operability to the pressing operation portion. 5. The method for manufacturing a cover member for a film unit with a lens according to claim 4, wherein a breakable groove is formed in a bottom wall of the concave groove when the cover member is formed.