JPH11109468A - Film unit with lens - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a film unit with lens preventing dust and a foreign matter from entering inside and excellent in impact absorbing characteristic. SOLUTION: A front cover 6 and a rear cover 7 which are the housing case of this film unit with the lens are constituted of a resin plate 47 formed by the two-color molding of an outer layer 45 constituted of elastomer and an inner layer 46 constituted of rigid plastic as shown inside an upper circle in the figure. The elastomer constituting the layer 45 being the outer surface side of the film unit with the lens is a high polymer substance having rubber state elasticity.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film unit having a built-in unexposed photographic film and a simple photographic mechanism including a photographic lens and a shutter mechanism.

[0002]

2. Description of the Related Art As a film unit with a lens, which has a simple exposure mechanism and is loaded with an unexposed photographic film and a patrone in advance at the time of manufacture, which eliminates the need for cumbersome film loading and rewinding operations, for example, "Photorun" Su
per 800 "(product name) is manufactured and sold by the present applicant. Such a film unit with a lens is widely used in general because it is easy to take a photograph immediately upon purchase, and it is easy to leave the photograph unit immediately after taking the photograph.

[0003] In particular, recently, the "Advanced Photo System" including a photo film and a cartridge of a new standard has been developed.
A film unit with a lens loaded with a photographic film cartridge corresponding to "" is also manufactured and sold by the present applicant as "Sharp Run Super Slim" (trade name).

By the way, such a film unit with a lens is manufactured by injection molding on a front cover and a rear cover constituting a front surface of the film unit with a lens in order to efficiently produce the film unit with a reduced number of components. It is formed integrally. As described above, by reducing the number of parts to be assembled, not only the efficiency of assembling the film unit with the lens and the cost reduction but also the outer diameter can be reduced.

[0005]

As described above, when the components are integrally formed on the front cover and the rear cover by injection molding, in order to simplify the mold structure, the vicinity of the integrally formed components is reduced. It is necessary to provide an opening in the like. However, if such an opening is exposed as it is and the product is exposed, not only does the appearance deteriorate, but also dirt and foreign matter enter the inside of the film unit with the lens through this opening, causing a failure of the film unit with the lens. Becomes

For this reason, a film unit with a lens as a product is sold in a state in which a unit body constituting the film unit with a lens is covered with a paper box or a sheet. However, such paper boxes and sheets are not completely in close contact with the unit body, so dust and foreign matter enter the film unit with lens through the opening from the gap between the unit body and the paper box or sheet. It may get in, causing a failure of the film unit with lens,
The invading dust adheres to the photographic film and causes a reduction in photographic properties.

Also, since the grip portion, which is a portion for gripping the lens-fitted film unit, is formed of a hard plastic integral with most of the other constituent materials, it is easy to slip with moisture or fat, and the This could cause the film unit to fall accidentally. And since most of the lens-fitted film unit is made of only hard plastic, if it is accidentally dropped as described above, it has low elasticity, hardly absorbs shock, and the outer surface may be damaged. In some cases, the internal mechanism may malfunction.

The present invention has been made in consideration of the above-mentioned problems of the prior art, and has as its object to provide a film unit with a lens which prevents dust and foreign matter from entering the inside and has excellent shock absorption. I do.

[0009]

In order to achieve the above object, a film unit with a lens according to the present invention comprises:
A front cover and a rear cover which cover at least the front and rear of the unit body are formed using a two-color molded resin plate whose outer layer is made of an elastomer and whose inner layer is made of a hard plastic.

[0010] In the second aspect of the present invention, the resin plate is molded in two colors by an insert type, a rotary type, or a movable slide type. In the invention according to claim 3, the joint portion between the front cover and the rear cover is such that the outer layer on one of the front cover side and the rear cover side enters the inner layer side and is closely attached to the other inner layer, so that the joint portion is formed. It is intended to be sealed.

According to a fourth aspect of the present invention, the release button or the strobe charging button of the lens-fitted film unit is formed with only the outer layer without the inner layer formed inside. According to a fifth aspect of the present invention, the outer layer is pressed against a part of the film winding knob of the film unit with lens so that the winding force of the film winding knob is 400 g or less.

According to a sixth aspect of the present invention, a hole for forming an engaging member for engaging the front cover and the rear cover is covered by the outer layer.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an external perspective view of a lens-fitted film unit embodying the present invention, and FIG. 2 is an exploded perspective view of the unit main body in FIG. The film unit with lens 1 includes a unit main body 2 including a main body 3, a photographing mechanism 4 attached to the main body 3, a strobe device 5, and a front cover 6 and a rear cover 7 that cover these from front and rear. An unexposed photographic film cartridge 32 housed in the unit body 2 is provided.

As shown in the upper circle of FIG. 1, the front cover 6 and the rear cover 7 serving as the exterior of the lens-fitted film unit 1 have an outer layer 45 made of an elastomer and an inner layer 46 made of a hard plastic. It is composed of a resin plate 47 formed by color molding. The elastomer forming the outer layer 45 on the outer surface side of the lens-fitted film unit 1 is a polymer substance having rubber-like elasticity, and examples thereof include rubbers, thermoplastic elastomers, elastic fibers, and elastic foams. These elastomers used in the present invention are selected from those having a hardness of 30 to 95 on a JIS A scale.

The hard plastic forming the inner layer 46 on the inner surface side of the film unit with lens 1 is, for example,
Examples include polyethylene, polystyrene, and polyethylene terephthalate. These two layers of resin plate 47
Is molded in two colors by an insert type, a rotary type, or a movable slide type.

A release button 14 for operating the shutter device 8 is integrally provided on the upper surface of the front cover 6. The release button 14 is, as shown in FIGS. 3 and 4,
It is integral with the outer layer 45 made of an elastomer, and the inner layer 46 is not formed only at the release button 14. The release button 14 exhibits the resiliency of the push button by utilizing the elasticity of the elastomer.

As described above, by forming the release button 14 integrally with the outer layer 45 made of an elastomer, a gap around the release button 14 is completely eliminated. Accordingly, it is possible to prevent dust or foreign matter from entering the inside of the lens-fitted film unit 1 through the gap, thereby preventing the lens-fitted film unit 1 from being damaged or the invading dust from adhering to the photographic film, thereby deteriorating photographic properties. .

On the upper surface of the front cover 6, there is provided a photographing number display window 15 for exposing a part of the photographing number display plate 12, and the like. The photo film cartridge 32 stored in the unit body 2 is, for example, an “Advanced Photo Sys
tem "is used. The photo film cartridge 32 includes a photo film 33a in which two perforations are provided in one photographing frame, a spool 34 around which the photo film 33a is wound, and a cartridge 32 for rotatably storing the spool 34.
a.

The photographing mechanism 4 includes a well-known shutter device 8,
Photographing lens 9, viewfinder 11, and number-of-photographs display plate 1
2 etc. are provided. On the front surface of the front cover 6, an exposure hole for exposing the photographing lens 9, the finder 11 and the like is provided. A strobe charging button 1 for starting charging of the strobe device 5 is provided at a lower portion of the front of the front cover 6.
3 are provided integrally.

The flash charging button 13 is also formed integrally with an outer layer 45 made of an elastomer, similarly to the release button 14 described above.
The inner layer 46 is not formed only in the portion. As a result, the elasticity of the elastomer is used to exhibit the resiliency of the push button, and the gap around the flash charging button 13 is completely eliminated, so that dust and foreign matter enter the inside of the lens-fitted film unit 1 from the gap. Nothing.

An aperture 17 as an exposure light path is formed at the center of the main body 3, and a cartridge chamber 18 and a film roll chamber 19 are formed at both ends thereof. In the cartridge chamber 18 and the film roll chamber 19, a cartridge 32a and a film roll 33b obtained by rolling a photographic film 33a drawn out of the cartridge 32a into a roll shape are stored in a light-tight manner. Further, a cartridge 32 is provided above the cartridge chamber 18.
A winding knob 21 is provided as an operating member for rotating the spool 34a to wind the photographed photo film 33a into the cartridge 32a.

The rear cover 7 is provided with a viewing window (not shown) for the finder 11. In addition, the lower portion of the rear cover 7 has a cartridge chamber bottom cover 2 that covers the bottom of the cartridge chamber 18 and the bottom of the film roll chamber 19 in a light-tight manner.
5, a film roll chamber bottom cover 26 is provided integrally. Further, a winding knob 21 is provided at an upper end of the rear cover 7.
Is exposed so that it can be rotated.

As shown in FIG. 5, the hoisting knob 21
On the upper and lower surfaces, the ends of the outer layer 45 constituting the rear cover 7 abut from above and below to close the gap near the opening where the winding knob 21 is exposed, and dust and foreign matter enter the inside of the lens-fitted film unit 1 from the gap. Prevent entry. In addition,
The ends of the outer layer 45 are pressed against the upper and lower surfaces of the winding knob 21 so that the winding force of the winding knob 21 is 400 g or less.

The front cover 6, the rear cover 7, and the main body 3 are integrated with each other by nail coupling to form the unit main body 2. As shown in FIG. 6, the formation portion of the engagement claw 52 for the claw connection has an opening 5 due to the characteristics of molding.
3 are formed, and the opening 53 is covered by an upper layer 45 constituting the front cover 6 and the rear cover 7. Accordingly, dust and foreign matter do not enter the inside of the lens-fitted film unit 1 from the opening 53 through the gap.

The joint between the front cover 6 and the rear cover 7 is formed as shown in FIG. 7 by the outer layer 45 of the front cover 6 entering the inner layer side and being brought into close contact with the inner layer 46 of the rear cover 7 so that dust is removed. The joint is sealed so that no foreign substances or foreign substances enter the inside of the lens-fitted film unit 1 through the gap.

On the left side of the unit body 2 as viewed from the front, a grip portion 40 bulging in the front direction is formed so as to follow the outer surface of the photographic film cartridge 32 stored in the cartridge chamber 18. This grip part 40
Since the front cover 6 has a two-layer structure and the outer layer 45 is made of an elastomer, the front cover 6 is less slippery and has an excellent hold feeling.

The operation of the thus-configured film unit with lens will be described. In the film unit with lens 1 of the present invention, a front cover 6 and a rear cover 7 are formed by a two-color molded resin plate 47 of an outer layer 45 of an elastomer and an inner layer 46 of a hard plastic. Since the gap at the joint between the lens and the rear cover 7 and the exposed portion of the winding knob 21 is closely adhered or closed by the outer layer 45, dust and foreign matter do not enter the inside of the film unit with lens 1 from the gap. In addition, it is possible to prevent malfunctions and failures caused by these. Also,
A simple life waterproofing function can also be provided.

Further, since the flash charging button 13 and the release button 14 are formed integrally with an elastic outer layer 45 and a hard inner layer is not provided only in this portion, the assembly of these movable parts is facilitated, It is possible to prevent dust or foreign matter from entering the inside of the lens-fitted film unit 1 from the gap between the charge button 13 and the release button 14 from the gap.

Further, since the front cover 6 and the rear cover 7 are formed by the two-color molded resin plate 47 of the outer layer 45 of the elastomer and the inner layer 46 of the hard plastic, the photographer grips the film unit with the lens. Since the grip portion 40 to be held is covered with the flexible elastomer, the grip portion 40 is less slippery, has an excellent holding feeling, and reduces the possibility of the film unit with lens 1 dropping.

Further, since the outer surface of the film unit with lens 1 is covered with the outer layer 45 made of an elastic elastomer, even if the film unit with lens 1 is dropped, the impact is reduced, and It is possible to prevent breakage and malfunction of the attached film unit.

[0031]

As described above, according to the film unit with a lens of the present invention, at least the front and the back of the unit body are respectively formed by using a two-color resin plate whose outer layer is made of an elastomer and whose inner layer is made of a hard plastic. Since the front cover and the rear cover are formed, it is possible to provide a lens-fitted film unit that prevents dust and foreign matter from entering the inside and has excellent shock absorption.

[Brief description of the drawings]

FIG. 1 is an external perspective view showing a film unit with a lens embodying the present invention.

FIG. 2 is an exploded perspective view of the unit main body of FIG.

FIG. 3 is a perspective view showing the vicinity of a release button.

FIG. 4 is a sectional view of FIG. 3;

FIG. 5 is a perspective view showing the vicinity of a winding knob.

FIG. 6 is a perspective view showing the vicinity of an engagement claw.

FIG. 7 is a cross-sectional view showing the vicinity of a joint between a front cover and a rear cover.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Film unit with a lens 2 Unit main body 6 Front cover 7 Rear cover 40 Grip part 45 Outer layer 46 Inner layer

Claims (6)

[Claims] 1. A lens having a front cover and a rear cover formed by using a two-color resin plate whose outer layer is made of an elastomer and whose inner layer is made of a hard plastic, and which covers at least the front and rear of the unit body. Film unit. 2. The method according to claim 1, wherein the resin plate is an insert type, a rotary type,
2. The film unit with a lens according to claim 1, wherein the film unit is molded in two colors by a movable slide type. 3. The joint between the front cover and the rear cover is such that the outer layer on one of the front cover side and the rear cover side enters the inner layer side and is tightly adhered to the other inner layer so that the joint is sealed. The film unit with a lens according to claim 1 or 2, wherein: 4. The lens according to claim 1, wherein the release button or the strobe charging button of the lens-fitted film unit is formed only of the outer layer without the inner layer formed inside. With film unit. 5. The film winding knob of the lens-equipped film unit, wherein the outer layer is pressed against a part of the film winding knob such that the winding force of the film winding knob is 400 g or less. The described film unit with lens. 6. The lens-fitted film unit according to claim 1, wherein a hole for forming an engagement member for engaging the front cover and the rear cover is covered by the outer layer. .