JP3193213B2 - Film unit with lens - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film unit with a lens, and more particularly, to a film unit with a lens having a lens in a finder.

[0002]

2. Description of the Related Art Conventionally, as disclosed in Japanese Patent Application Laid-Open No. 3-39834, a main body in which a photographic lens, a shutter mechanism, a film winding mechanism, and the like are incorporated is previously provided with the international standard ISO 1007-1979. A film unit with a lens in which the 135 film with a patrone specified by the year is housed in a light-tight manner and the front cover and the rear cover are fixed to the base of the main unit is provided. ing. Such a film unit with a lens is submitted to a photo lab as it is when all frames of a built-in negative film have been photographed. At the photo lab, the patrone containing the exposed film is taken out and subjected to processing such as development and printing using the current development processing system, and the print photograph and the film negative are returned to the user.

In such a film unit with a lens, a so-called plain finder in which an opening for an eyepiece and an opening for an object are provided in a rear cover and a front cover, respectively, is mainly used. However, in a panoramic type lens-equipped film unit capable of obtaining a printed photograph having a wide width, a considerably large aperture is required because the shooting angle of view is wide, and in a telephoto type lens-equipped film unit having a longer focal length, The opening was too small and the composition was hard to decide. Therefore, in a film unit with a lens disclosed in Japanese Utility Model Application Laid-Open No. 3-114829 and the like, an inverted Galilean finder in which an objective lens and an eyepiece lens are arranged between openings of a front cover and a rear cover is built in. I have.

[0004] In order to protect the environment or reduce industrial waste, industrial products are being recycled. Recently, film units with lenses have been recycled in various forms. After disassembling used film units with lenses, some parts can be reused as they are, or they can be dissolved and pelletized to produce raw materials. We are trying to reuse it.

[0005]

However, since the objective lens and the eyepiece of the finder are exposed outside the lens-fitted film unit, they are easily scratched or stained. Therefore, when reusing after collection,
Since it is a member that can be visually checked as well as an inspection to check for the presence or absence of scratches, it is necessary to perform cleaning for sanitary reasons, and the cost associated with reuse has been high. In addition, since it cannot be reused immediately after collection, it also has an adverse effect on the efficiency of manufacturing and assembling a film unit with a lens.

The present invention has been made in view of the above problems, and provides a lens-equipped film unit having a finder which can be reused without collection and time-consuming inspection and cleaning after collection. The purpose is to:

[0007]

In order to solve the above problems, a film unit with a lens according to the present invention is provided with a front cover.
A transparent dust-proof cover that protects the objective lens and the eyepiece is detachably attached to the cover and the rear cover . Accordingly, since the objective lens and the eyepiece are not directly exposed to the outside of the film unit with a lens, they are not scratched or stained, and can be reused immediately after collection without performing inspection or washing. In addition, the front cover and the rear cover
When reused as, dustproof formed of different materials
The cover can be removed to prevent deterioration of raw materials.
Can be stopped.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A description will now be given of a film unit with a lens according to a first embodiment of the present invention. FIG. 2 shows the appearance of the film unit with a lens according to the present invention. The lens-fitted film unit 2 includes a unit main body 3 having a built-in photographing mechanism and an outer case 4 for housing the unit. The outer case 4 has a contour for exposing the winding knob 5, the shutter button 6, the photographing lens 7, and the like, and is provided with a hole for exposing the viewfinder 8, the number-of-photographs display plate 9, and the like. .

As shown in FIG. 3, the unit main body 3 includes a main body base 11, a front cover 12, and a rear cover 1.
3 which are detachably attached by pawl engagement. On the front side of the main body 11, a photographing lens 7 and shutter blades are incorporated, and a light-shielding tube 14 surrounding the photographing optical path in a cylindrical shape is integrally provided. On the back side, an aperture for determining an exposure range to the film is provided. Are formed. On both sides of the light shielding tube 14, a patrone storage chamber 15 for storing a patrone and a film roll chamber 16 for storing a rolled film are formed, and a shutter mechanism and a film winding mechanism are provided at the upper part. A finder 8 is provided.

In the upper part of the patrone storage chamber 15, a hoisting knob 5 which engages with the axis of the patrone is provided rotatably. A tooth row 5a in which teeth are arranged at a constant pitch is formed on the outer periphery of the hoisting knob 5, and is used as an engaging portion for winding.

A film support surface 18 is formed on the rear cover 13 at a portion facing the aperture. On the bottom surface side, pull-top lids 19 and 20 that cover the bottom surfaces of the patrone storage chamber 15 and the film roll chamber 16 are provided, respectively. The cover 19 serves as a take-out cover for taking out the cartridge containing the exposed film. Also,
An eyepiece side finder window 22 in which an eyepiece dustproof cover 21 formed of a transparent resin is fitted is provided at a portion facing the finder 8.

The front cover 16 has a shutter button 6, a number-of-images-to-be-photographed number display window 10, an image-taking opening 23, and the like, and an object having an object dust-proof cover 24 fitted at a position facing the finder 8. A side finder window 25 is provided.

At the time of assembly, a 135-film patrone with a patrone is stored in the patrone storage room 15,
After the unexposed film in the form of a roll drawn out from the patrone is stored in the film roll chamber 16, the film is hermetically sealed with the rear cover 13. Then, the front cover 12 is attached so as to cover the main body base 11.

As shown in FIG. 1 and FIG.
Is formed integrally with the main body base 11 and has a U-shaped holding frame 27 with an opening facing upward, and is assembled into a groove 27a formed on the back side of the holding frame 27 by using a protruding piece 28a. An eyepiece 28, an objective lens 29 which is also incorporated into a groove 27b formed on the front side of the holding frame 27 using a projection piece 29a, and presses and holds the eyepiece 28 and the objective lens 29 from above. A holding lid 30 for preventing dust and dirt from entering the frame 27 is engaged from above by a claw 30a.

An eyepiece dustproof cover 21 made of a transparent resin is fitted into the eyepiece finder window 22 of the rear cover 13 from the inside. The eyepiece dustproof cover 21 is provided with support pieces 21a on both side surfaces so that when the eyepiece dustproof cover 21 is fitted into the eyepiece side finder window 22, the eyepiece dustproof cover 21 comes into contact with the surface 22a which is recessed one step. When the rear cover 13 is fixed to the main body base 11, the eyepiece dustproof cover 21 is pushed from the inside by the finder 8, but does not come off because the support piece 21a is in contact with the surface 22a. Similarly, an objective dustproof cover 24 is attached to the objective-side finder window 25 using the support piece 24a and the surface 25a.

Next, a description will be given of a process of collecting the film unit with a lens having the above-mentioned structure from a developing laboratory and disassembling the film unit. In the first step, the outer case 4 is removed from the collected film unit with lens 2. This outer case 4
Is recycled as waste paper in the case of a paper box, for example.
In the second step, the front cover 12 is removed from the unit body 3. The objective dustproof cover 24 is removed from the removed front cover 12, and is crushed, then melted and pelletized. After the front cover 12 is removed, the parts of different materials such as a metal spring, the photographing lens 7 and the shutter blade are also removed from the shutter mechanism and the film winding mechanism.
The photographic lens 7 removed is crushed and then dissolved and pelletized.

In the third step, the cover 30 is removed from the finder 8, and the eyepiece 28 and the objective lens 29 are removed. In addition, the eyepiece 28 and the objective lens 29
Since it is protected from the outside by the dustproof covers 21 and 24, there is no scratch or dirt, and there is no need to perform an inspection. Also,
There was no hygiene problem since there was no direct contact, and there was no need for cleaning. Therefore, the extracted eyepiece lens 28 and objective lens 29 are collected and conveyed to a reassembling process of the lens-fitted film unit.
Then, the main body base 11 and the rear cover 13 are separated, and the dustproof cover 21 for the eyepiece is removed from the rear cover 13, and each is sent to the resin remanufacturing process.

Next, a description will be given of the reassembly step of the above-mentioned lens-fitted film unit. First, the shutter mechanism and the film wind-up mechanism are assembled on the light-shielding cylinder 14 of the newly formed main body base 11, the shutter blades and the photographing lens 7 are assembled on the front surface, and the wind-up knob 5 is mounted on the upper part of the patrone storage chamber 15. And the holding frame 27
Then, the eyepiece 28 and the objective lens 29 conveyed from the disassembling process are inserted from above, and the upper part is pressed by the newly formed holding lid 30.

Thereafter, a film with a patrone is loaded from the rear side of the main body base 11 in a dark room, and sealed with the rear cover 13. The viewfinder window 22 on the eyepiece side of the rear cover 13
, A newly formed dustproof cover 21 for eyepiece is fitted. Then, the front cover 12 is fixed to the main body base 11, and a newly formed dustproof cover 24 for the object is also fitted in the object-side finder window 25. Finally, the assembled unit main body 3 is covered with the outer case 4 to complete the lens-fitted film unit 2 as shown in FIG. Then, in the function inspection after completion, the inspection of the finder 8 is also performed.

Next, a second embodiment of the present invention shown in FIG. 5 will be described. The finder 40 is detachable with respect to the main body base 43 by a convex portion 42 provided below the holding frame 41 and a concave portion 43a formed in the main body base portion 43.

The holding frame 41 has a U-shape with an opening facing upward, and an eyepiece 44 is inserted into a groove 41a formed on the back side of the holding frame 41 by using a protruding piece 44a. Similarly, an objective lens 45 which is similarly incorporated into a groove 41b formed on the front side of the holding frame 41 by using a protruding piece 45a, presses the eyepiece lens 44 and the objective lens 45 from above, and A holding lid 46 for preventing dust and dirt from entering is placed from above. A box-shaped dustproof cover 47 made of transparent resin is formed from the eyepiece lens side, and a box-shaped dustproof cover 4 formed of the same transparent resin is formed from the objective lens side.
8 are put on the ends of the holding frame 41 and the holding lid 46, respectively. These dustproof covers 47, 48 have claws 47a,
48a are formed, and are detachable using the engaging portions 41c and 41d formed on the holding frame 41. When the front cover 49 and the rear cover 50 are attached to the main body base 43, the dustproof covers 47 and 48 are exposed to the outside from the finder windows 51 and 52, respectively.

As shown in FIG. 6, which is a third embodiment of the present invention, a holding frame 56 constituting a finder 55 is formed into a cylindrical shape, and an objective lens 57 and an eyepiece 58 are formed from the front and back sides. May be inserted so that the objective dust cover 59 and the eyepiece dust cover 60 cover the lenses 57 and 58. As described above, the finder 40 and the finder 55 described in the second and third embodiments are detachably unitized with respect to the main body base of the unit main body.
At the time of disassembly after recovery, the finder with the holding frame is removed from the base of the main body, the dustproof cover for the eyepiece and the dustproof cover for the object are replaced with newly molded ones, and the holding frame, the eyepiece and the objective lens can be reused as they are .

A finder 65 shown in FIG. 7 which is a fourth embodiment of the present invention uses the holding frame 27, the dustproof cover 24 for the objective and the dustproof cover 21 for the eyepiece described in the first embodiment. The cover 66, the objective lens 67 and the eyepiece 68 are integrally formed of a transparent resin. According to this, at the time of assembling the film unit with the lens, the objective lens and the eyepiece do not have to be handled separately, so that the assembling efficiency and the suitability of automatic assembling are improved. Further, a holding lid integrally formed with the eyepiece and the objective lens may be incorporated into the upper surface of the front cover, so that the holding lid forms a part of the front cover. In this case, the holding lid is formed of a transparent resin, but is covered with the outer case, so that there is no problem with the light shielding performance in the unit body.

[0024]

As described above, the eyepiece and the objective lens of the finder used in the film unit with a lens according to the present invention are configured such that the object side and the pupil side are covered by the transparent dust-proof covers, so that Since it is not exposed to the outside, it is not scratched or stained, and it is not directly visible, so there is no hygiene problem. This eliminates the need to modify the optical system by exchanging the dust-proof cover after collection, so that the time and cost required for inspection and cleaning can be saved. Also, the front and rear covers are reused as raw materials
A dust cover made of a different material.
Because it can be removed, it is possible to prevent deterioration of raw materials
it can.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view illustrating a configuration of a finder according to a first embodiment.

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 sectional view of a main part of the unit body.

FIG. 5 is an exploded perspective view illustrating a configuration of a finder according to a second embodiment.

FIG. 6 is an exploded perspective view illustrating a configuration of a finder according to a third embodiment.

FIG. 7 is an exploded perspective view illustrating a configuration of a finder according to a fourth embodiment.

[Explanation of symbols]

 2 Film unit with lens 8, 40, 55, 65 Viewfinder 21, 47, 60 Eyepiece dustproof cover 24, 48, 59 Objective dustproof cover 27, 41, 56 Holding frame 28, 44, 58, 68 Eyepiece lens 29, 45 , 57,67 Objective lens 30,46,66 Cover

Claims (1)

(57) [Claims] A patrone chamber for accommodating the patrone;
Pull out the film from the patrone and roll it into a roll.
A film roll chamber for storing is formed, and an objective lens and
Main body with a viewfinder consisting of an eyepiece
The base and the objective lens attached to the front of the base
The front cover with the objective-side finder window
And the eyepiece attached to the back of the base
After the eyepiece finder window to be exposed is formed,
And collected after use, from the base to the front cover and back
A film unit with a lens for removing and reusing the cover as a raw material , wherein the objective viewfinder window of the front cover and the eyepiece side of the rear cover.
Protect the objective and eyepieces from the viewfinder window.
Attach transparent dustproof covers each
When the bar and rear cover are reused as raw materials,
A film unit with a lens, characterized in that the dust cover can be removed .