JPH068588Y2 - Film unit with lens - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a container for storing photographic film, more specifically, a film packaging container having a photographing function such as a photographing lens and a shutter (hereinafter referred to as "film unit"). ) Is related to.

[Conventional technology]

A film unit with a lens that incorporates a film into the unit body that incorporates a simple shutter and film winding mechanism so that you can easily enjoy photography even if you do not own a camera )
Provided by the applicant. The user can enjoy taking pictures just by purchasing this lens-equipped film unit, and after using the lens-equipped film unit, he / she can submit it to a photofinishing shop without any troublesome operations such as loading / unloading the film. It is no longer needed.

Since the film unit with the lens that has been collected is disassembled and the film that has been photographed is taken out at the developing station, the unit body is not reused. Therefore, it is preferable to keep the cost of the unit main body as low as possible, and for this reason, a single lens made of plastic molding is used as the taking lens.

By the way, when a lens is manufactured by plastic molding, liquid plastic is filled from the sprue of the molding die into the mold, but the lens obtained as a molded product has a projection with a shape corresponding to the sprue. Comes to be attached. Moreover, in the vicinity of the gate, it is difficult to stabilize the optical properties of the plastic, such as the refractive index and the shape of the curved surface. Therefore, when manufacturing a plastic lens for a film unit with a lens up to now, the flange part is also integrally molded so as to surround the lens part, and the excess flange part is cut together with the protrusion before incorporating it into the unit body. I am trying to do it.

[Problems to be solved by the invention]

However, by cutting the flange part as described above,
When the lens after cutting is incorporated into the unit body, it is necessary to align the optical axis of the lens with the center of the aperture opening provided in the unit body in advance, which causes a problem in work efficiency.

The present invention has been made in view of the above-mentioned conventional techniques, and it eliminates the need for cutting the flange portion of a molded plastic lens, and when assembling this lens into the unit body, the position with the diaphragm plate is eliminated. It is an object of the present invention to provide a lens-fitted film unit that does not require adjustment work and saves manufacturing costs.

[Means for solving problems]

In order to achieve the above object, the present invention enables the taking lens and the diaphragm to be bonded together by aligning the optical axes in advance, so that the diaphragm attaching operation and the taking lens fitting operation can be performed at the same time without shifting the optical axis. , To simplify the manufacturing process of the lens-fitted film unit.

〔Example〕

Referring to FIG. 3 showing an external view of a film unit with a lens using the present invention, a unit main body 1 includes a main body base 2, a front cover 3 for covering the front and upper surfaces thereof, and a main body base 2.
And a back cover 4 that covers the back and bottom surfaces of each of these, each of which is made by molding an opaque plastic material. An opening 3a for exposing the taking lens 5 and a viewfinder opening 3b are formed on the front surface of the front cover 3,
A light-shielding tube 3c for defining a finder optical path is connected to the finder opening 3b. Further, openings 3d and 3e for exposing the shutter button 6 and the counter display plate 7 are formed on the upper surface of the cover 3. The unit main body 1 is used while being packaged in, for example, an outer box made of paper. Therefore, the outer box has an opening at a required portion so that the opening 3a, the finder opening 3b, and the shutter button 6 can be used. It is formed.

As shown in FIG. 1 showing a state where the unit main body 1 is being assembled, the main body base 2 has an international standard (ISO 1
135 film 8 specified in 007-1979 edition)
And the cartridge 9 is installed in advance. Therefore, a cartridge chamber 11 and a film roll chamber 12 are provided in the main body base 2 so as to sandwich the exposure frame 10 (see FIG. 2). An unexposed film roll 8a is loaded in the cartridge chamber 11 and loaded in the film roll chamber 12 and wound in a roll shape in the film roll chamber 12.
Is loaded. A film winding knob 13 is provided on the upper portion of the cartridge chamber 11.
1 when the cartridge 9 is axially loaded,
The reel 1 of the cartridge 9 is attached to the fork provided integrally with
4 engage.

A lens board 15 is attached to the front surface of the main body base 2. An opening 16 and a sleeve 17 provided so as to surround the opening 16 are formed in the center of the lens board 15, and the opening 16 communicates with the exposure frame 10 to define a photographing optical path. In the sleeve 17, the taking lens 5 and the diaphragm plate 18 are mounted.

The taking lens 5 is described in detail as shown in FIG.
A lens portion 5a for performing an image forming action, and this lens portion 5a
And a flange portion 5b surrounding the outer periphery of the plastic lens are integrally molded. Then, the diaphragm plate 18 is adhered to the flange portion 5b. Diaphragm plate 18
Is also formed by plastic molding, and a diaphragm opening 18a is provided in the center thereof. For example, a dedicated jig or the like is used to bond the photographing lens 5 and the diaphragm plate 18, and the bonding is performed after the optical axis of the photographing lens 5 is adjusted so as to pass through the center of the diaphragm aperture 18a. Also, the flange portion 5
The protrusion is integrated on the back surface of b, and this protrusion is used for the diaphragm plate 1.
The positioning may be performed by engaging with a concave portion provided on the front surface of 8. Note that reference numeral 5c indicates a protruding portion that remains corresponding to the sprue part of the mold during the molding process of the taking lens 5.

The diaphragm plate 18 integrated with the taking lens 5 in this way is fitted into the sleeve 17 of the lens board 16. As described above, if the optical axis of the taking lens 5 is adjusted so as to pass through the center of the aperture opening 18a, the aperture plate 18 may be attached to the sleeve 1.
Even if there is a slight positional deviation when it is fitted in 7, it does not affect the imaging action of the taking lens 5.

After the lens board 15 is attached to the main body base 2, the front cover 3 and the back cover 4 are integrated with the main body base 2. At this time, the engaging plate 19 integrally provided on the bottom surface of the front cover 3 is fitted into the recess 20 formed on the bottom surface of the main body base 2.

A film supporting surface 21 is formed on the inner surface of the back cover 4, and an opening 22 for the viewfinder eyepiece and an opening 23 for partially exposing the winding knob 13 are provided. By attaching this back cover 4 to the main body base 2, the exposure frame 10, the cartridge chamber 11 and the film roll chamber 12 are shielded from light. A part 4a of the back cover 4 that covers the bottom surface of the cartridge chamber 11 can be opened in a pull-top manner so that the cartridge 9 can be removed from the used film unit with a lens collected at the developing station. It can be taken out with a simple operation.

In FIG. 2 showing the cross section of the main part of the film unit with lens, at the time of purchase, all the films 7 drawn out from the cartridge 9 are stored in the film roll chamber 12 as film rolls 7a. By pressing the shutter button 6, the shutter 25 provided behind the taking lens 5 opens and closes, and the film 7 located in the exposure frame 10 is exposed. By the operation of the shutter 25, the well-known winding stop mechanism is unlocked, and the rotation operation of the knob 13 is allowed. When the knob 13 is rotated, the winding shaft 14
Rotates in the counterclockwise direction, so that the film 7 that has been photographed is caught in the cartridge 9.

The main body base 2 is provided with a sprocket (not shown) that rotates by being engaged with the film perforation, and when the film 7 is fed by the rotation of the knob 13 for one frame to the cartridge 9, the sprocket rotates. Shutter charging is performed by a well-known self-cocking mechanism that is interlocked with, and the counter display plate 7 advances to move the knob 1
The rotation of 3 is locked. As a result, the film of the next frame is positioned on the exposure frame 10, and the next shooting sequence is completed.

By repeating the above operation, the film 7 having been photographed is successively wound around the cartridge 9. And
When the final frame is photographed and the knob 13 is rotated, the film 7 is caught in the cartridge 9 up to the end portion. The film unit with lens thus used is directly collected in the developing place. Since the film 7 that has been photographed is all wound in the light-shielding film cartridge 9, it is possible to open the film cartridge 9 from the unit body 1 by opening a part 4a of the back cover 4 in a bright room in the developing room. It is possible to obtain a print photograph by the conventional development processing procedure.

In the embodiment shown above, the diaphragm plate 18 is fitted into the sleeve 17 of the lens board 15 to be mounted, but a projection for positioning and mounting is integrally formed on the back surface of the diaphragm plate 18, and this projection is used. Lens board 1
The diaphragm plate 18 may be fixed to the unit 7. Further, the outer diameter of the diaphragm plate 18 is made smaller than the outer diameter of the taking lens 5,
The taking lens 5 may be fitted in the sleeve 17. Furthermore, the taking lens 5 with the diaphragm plate 18 integrated therein
May be held by being sandwiched between the lens board 15 and the front cover 3.

Of course, the present invention is not limited to the lens-fitted film unit described above, and can be applied to a simple camera in exactly the same manner.

[Effect of device]

As described above, according to the lens-fitted film unit of the present invention, the flange portion is also integrated with the photographing lens manufactured by plastic molding, and the opaque plate having the aperture opening is bonded to the flange portion. I am trying. Therefore, the troublesome work of assembling the taking lens while adjusting the position with the diaphragm aperture is not necessary, and the work of cutting and removing the flange part from the taking lens after molding is also eliminated, and the manufacturing cost of the film unit with lens is reduced. Is very effective in keeping the value low.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of the present invention. FIG. 2 is a sectional view of an essential part of a lens-fitted film unit according to the present invention. FIG. 3 is an external view of a lens-fitted film unit according to the present invention. FIG. 4 is a sectional view of a lens board, a taking lens and a diaphragm plate of the film unit with a lens according to the present invention. 1 …… Unit main body 2 …… Main body base 3 …… Front cover 4 …… Back cover 5 …… Shooting lens 7 …… Film 9 …… Patrone 15 …… Lens board 16 …… Aperture 18 …… Aperture plate 18a …… Aperture

 ─────────────────────────────────────────────────── --Continued from the front page (56) References Japanese Patent Publication No. Sho 48-31249 (JP, B1) US Patent 3896467 (US, A) Camera Communication September 1987, pp. 84-86

Claims (1)

[Scope of utility model registration request] 1. A lens section and a flange section surrounding the outer circumference of the lens section are integrally molded, and a photographing lens left on the outer circumference of the flange section with protrusions of a sprue mark at the time of molding and a diaphragm opening are formed. An opaque diaphragm plate, which is positioned so that the optical axis of the lens portion coincides with the center and has a shape including the flange portion and the sprue trace within the outer contour, and an aperture for passing a photographing light beam, A film unit with a lens, comprising: a lens board having a concave portion into which a photographing lens having a plate adhered therein is formed.