JPH07134369A - Film unit with lens (disposal camera) - Google Patents

Abstract

PURPOSE:To reuse an eyepiece and an objective lens as they are without being inspected and cleaned by preventing the eyepiece and the objective lens fro being directly exposed outside with a dustproof cover. CONSTITUTION:The eyepiece 28 and the objective lens 29 are inserted into a holding frame 27 provided integrally on a base part to be pressed from above by a pressing cover 30. A dustproof cover for the objective lens 24 and a dustproof cover for the eyepiece 21 made of transparent resin are attached to the finder window for the objective lens 25 of a front cover 12 and the finder window for the eyepiece 22 of a rear cover 13, respectively.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art Conventionally, as disclosed in Japanese Patent Laid-Open No. 3-39734, etc., an international standard ISO 1007-1979 is previously provided in a main body portion in which a photographing lens, a shutter mechanism, a film winding mechanism and the like are incorporated. A film unit with a lens "Sharan-run (product name)" is provided, which has a structure in which a 135 film with a cartridge specified by the year is stored in a light-tight manner, and a front cover and a rear cover are fixed to the base of the main body. ing. Such a film unit with a lens is submitted to the photofinishing laboratory as it is after the photographing of all the frames of the negative film built in advance is completed. At the photo lab, the film cartridge containing the exposed film is taken out, processed and developed using the existing photo 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 viewfinder in which a rear cover and a front cover are provided with eyepiece openings and objective openings, respectively, has been mainly used. However, in a panoramic type lens-equipped film unit that can obtain a wide print photograph, a considerably large aperture is required because of the wide shooting angle of view, and in a telephoto type lens-equipped film unit with a long focal length, The aperture was too small to compose the composition. Therefore, in a film unit with a lens disclosed in Japanese Utility Model Laid-Open No. 3-114829, 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 incorporated. There is.

By the way, industrial products are recycled in order to protect the environment or reduce industrial waste. Recently, the lens-fitted film unit is also recycled in various forms, and after disassembling the used lens-fitted film unit, some parts can be reused as they are, or melted and pelletized to be used as raw materials. We are trying to reuse it.

[0005]

However, since the objective lens and the eyepiece lens of the finder are exposed to the outside of the lens-fitted film unit, they are easily scratched or soiled. Therefore, when reused after collection,
In addition to the inspection for checking the presence of scratches, since it is a member that can be seen directly, it is necessary to wash it for hygienic reasons, and the cost associated with reuse is high. In addition, since it cannot be reused immediately after collection, it adversely affects the manufacturing and assembling efficiency of the lens-equipped film unit.

The present invention has been made in view of the above problems, and provides a film unit with a lens provided with a finder that can be reused without recovery and time-consuming inspection and cleaning after recovery. The purpose is to

[0007]

In order to solve the above problems, in the film unit with a lens of the present invention, transparent dustproof covers are detachably attached to the object side of the objective lens and the pupil side of the eyepiece, respectively. It is a thing. As a result, the objective lens and the eyepiece lens are not directly exposed to the outside of the lens-equipped film unit, so that they are not scratched or soiled, and can be reused immediately after collection without inspection or cleaning.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The lens-fitted film unit of the first embodiment of the present invention will be described below. FIG. 2 shows the appearance of the film unit with lens of the present invention. The lens-equipped film unit 2 is composed of a unit main body 3 having a built-in photographing mechanism and an outer case 4 for housing the same. The outer case 4 has a contour that exposes the winding knob 5, the shutter button 6, the taking lens 7, and the like, and is provided with holes for exposing the viewfinder 8, the number-of-photos display plate 9, and the like. .

As shown in exploded view in FIG. 3, the unit main body 3 includes a main body base 11, a front cover 12 and a rear cover 1.
3 and these are detachably attached by claw engagement. The body base 11 is provided with a taking lens 7 and shutter blades on the front side, and is integrally provided with a light-shielding tube 14 that surrounds the taking optical path in a tubular shape. On the back side, an aperture that determines the exposure range of the film is formed. Are formed. On both sides of the light-shielding cylinder 14, a cartridge storage chamber 15 for storing a cartridge and a film roll chamber 16 for storing a rolled film are formed, and a shutter mechanism and a film winding mechanism are provided on the upper portion, A finder 8 is provided.

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

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

The front cover 16 is provided with a shutter button 6, a window 10 for displaying the number of shots, a shooting opening 23, and the like. An objective dustproof cover 24 is fitted at a position facing the finder 8. A side finder window 25 is provided.

At the time of assembling, a 135-film patrone with a patrone is stored in the patrone storage chamber 15,
Further, after the unexposed film in a roll form pulled out from the cartridge is housed in the film roll chamber 16, it is hermetically sealed by the rear cover 13. Then, the front cover 12 is attached so as to cover the main body base 11.

As shown in FIGS. 1 and 4, the finder 8
Is a U-shaped holding frame 27 that is integrally formed with the main body base 11 and has an opening facing upward, and is incorporated in a groove 27a formed on the back side of the holding frame 27 by using a projecting piece 28a. And an objective lens 29 that is incorporated in a groove 27b formed on the front side of the holding frame 27 by using a protrusion 29a, and presses and holds the eyepiece lens 28 and the objective lens 29 from above. A pressing lid 30 that prevents dust and dirt from entering the frame 27 is engaged by a claw 30a from above.

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

Next, a process of recovering the lens-fitted film unit having the above structure from the developing station and disassembling it will be described. In the first step, the outer case 4 is removed from the recovered lens-fitted film unit 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. From the removed front cover 12, the objective dust-proof cover 24 is removed, and after being crushed, they are melted and pelletized. After removing the front cover 12, parts made of different materials such as a metal spring, the taking lens 7 and the shutter blades are also removed from the shutter mechanism and the film winding mechanism.
The photographic lens 7 removed is crushed, then melted and pelletized.

In the third step, the pressing lid 30 is removed from the finder 8 and the eyepiece lens 28 and the objective lens 29 are removed. The eyepiece lens 28 and the objective lens 29 are
Since it was protected from the outside by the dustproof covers 21 and 24, it was free from scratches and stains and did not need to be inspected. Also,
There was no direct contact, so there was no hygiene problem and no need for cleaning. Therefore, the taken out eyepiece lens 28 and the objective lens 29 are collected and transported to the reassembly process of the film unit with a lens.
Then, the main body base 11 and the rear cover 13 are separated, the eyepiece dust-proof cover 21 is removed from the rear cover 13, and each is sent to the resin remanufacturing process.

Next, the process of reassembling the above-mentioned lens-fitted film unit will be described. First, the shutter mechanism and the film winding 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 winding knob 5 is mounted on the upper part of the cartridge storage chamber 15. Then, the holding frame 27
Then, the eyepiece lens 28 and the objective lens 29, which have been conveyed from the disassembling step, are inserted from the upper side, and the newly formed holding lid 30 holds down the upper side.

Thereafter, a film with a cartridge is loaded from the back side of the main body base 11 in a dark room, and the rear cover 13 seals the film. The viewfinder window 22 on the eyepiece side of the rear cover 13
A newly molded eyepiece dust-proof cover 21 is fitted into the. Then, the front cover 12 is fixed to the main body base 11, and the newly formed objective dustproof cover 24 is also fitted in the objective side finder window 25. By finally covering the assembled unit body 3 with the outer case 4, the lens-fitted film unit 2 as shown in FIG. 2 is completed. Then, in the function inspection after completion, the finder 8 is also inspected.

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

The holding frame 41 has a U-shape with its opening facing upward, and an eyepiece lens 44 incorporated in a groove 41a formed on the back side of the holding frame 41 by utilizing a projecting piece 44a. Similarly, the objective lens 45 that is incorporated in the groove 41b formed on the front surface side in the holding frame 41 by using the projecting piece 45a, the eyepiece lens 44 and the objective lens 45 are pressed from above, and A pressing lid 46 that prevents dust and dirt from entering is placed from above. Then, a box-shaped dustproof cover 47 for the eyepiece made of transparent resin from the eyepiece side, and a box-shaped dustproof cover 4 for the objective made of transparent resin from the objective lens side.
8 are covered on the ends of the holding frame 41 and the pressing lid 46, respectively. These dust covers 47, 48 have claws 47a,
48a is formed, and is detachable by using the engaging portions 41c and 41d formed on the holding frame 41. Then, 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 through 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 tubular shape, and an objective lens 57 and an eyepiece lens 58 are provided from the front side and the back side. Alternatively, the objective dustproof cover 59 and the eyepiece dustproof cover 60 may be inserted to cover the lenses 57 and 58. As described above, since 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, the lens-fitted film unit including the finder is
When disassembling after collection, remove the viewfinder together with the holding frame from the base of the main unit, replace the eyepiece dust cover and objective dust cover with newly molded ones, and reuse the holding frame, eyepiece lens, and objective lens as they are. .

In the finder 65 shown in FIG. 7, which is the fourth embodiment of the present invention, the holding frame 27, the objective dustproof cover 24 and the eyepiece dustproof cover 21 described in the first embodiment are used. The pressing lid 66, the objective lens 67, and the eyepiece lens 68 are integrally molded of transparent resin. According to this, at the time of assembling the film unit with the lens, it is not necessary to separately treat the objective lens and the eyepiece lens, so that the assembling efficiency and the appropriateness of the automatic assembling are improved. Furthermore, the pressing lid integrally formed with the eyepiece lens and the objective lens may be incorporated into the upper surface of the front cover so that the pressing lid constitutes a part of the front cover. In this case, the pressing lid is made of transparent resin, but is covered with the outer case, so there is no problem with the light-shielding performance inside the unit body.

[0024]

As described above, the eyepiece and the objective lens of the finder used in the film unit with a lens of the present invention are arranged such that the object side and the pupil side are covered with a transparent dustproof cover, so Since it is not exposed to the outside, it does not get scratched or dirty, and it does not come into direct contact with the eyes, so there is no hygiene problem. As a result, it is not necessary to change the optical system by replacing the dust-proof cover after collection, so that the time and cost required for inspection and cleaning can be saved.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing 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 a unit body.

FIG. 5 is an exploded perspective view showing the structure of the finder of the second embodiment.

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

FIG. 7 is an exploded perspective view showing a structure of a finder according to a fourth embodiment.

[Explanation of symbols]

 2 Film unit with lens 8, 40, 55, 65 Finder 21, 47, 60 Dust cover for eyepiece 24, 48, 59 Dust cover for objective 27, 41, 56 Holding frame 28, 44, 58, 68 Eyepiece lens 29, 45 , 57, 67 Objective lens 30, 46, 66 Presser lid

Claims (1)

[Claims] 1. A lens-equipped film unit having a finder objective lens and an eyepiece lens, wherein the finder is detachably attached with transparent dustproof covers on the object side of the objective lens and the pupil side of the eyepiece lens, respectively. A film unit with a lens that is characterized by being.