JP3017893B2 - 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 preventing structure for a film unit with a lens.

[0002]

2. Description of the Related Art In order to easily take a photograph at any time, a film unit with a lens, "Sharp Run Hi" (product name), with a built-in film in the unit body incorporating a simple photographing mechanism, has been filed by the applicant. Manufactured and sold,
Widely used. This film unit with a lens has a very simple structure as disclosed in, for example, Japanese Patent Publication No. 2-32615, and after photographing, a DPE can be requested for each film unit in the same manner as a conventional photographic film. ing.

In these film units with lenses,
An unexposed film drawn from the patrone between the unit body for accommodating the film and the rear cover is spread to an exposure position between the film roll chamber and the patrone chamber. When the unexposed film, which has been drawn out in advance and stored in a roll, is exposed in the film unit, it is taken up in the patrone every time it is taken, and completely stored in the patrone when all frames are taken. Can be stored.

A film passage is provided between the film rail of the unit main body and the rear cover so that the film imaging surface does not largely move back and forth. The dimension of this passage in the optical axis direction is called a tunnel amount, and this tunnel amount is greatly related to the depth of focus of the lens. When a bright lens such as a single-lens reflex camera is used, the depth of focus is shallow, so the tunnel amount is reduced to the bare limit of the film thickness (0.15 to 0.1).
2 mm) to suppress the fluctuation of the film surface. For this reason, the feeding power of the film becomes large. On the other hand, since the film unit with a lens uses dark lenses such as F11 and F13, the depth of focus is large and the tunnel amount is large (about 0.3 mm).

[0005]

However, as shown in FIG. 6, in the case of a film unit with a lens, an image is taken by a single-lens (or two-lens) photographing lens 41, so that aberrations which cannot be corrected by the lens itself are corrected. Rear cover 4
2, the film 43 is curved so that the exposure surface side is concave. Further, the flow of the film 43 is desirably a continuous curved surface having no inflection point as shown in the figure in consideration of feeding, but in this case, the patrone chamber 44 and the film roll chamber 45 project forward. I will.

Further, as shown in FIG. 9, in order to reduce the thickness of the camera body, if the bending of the film passage connecting the patrone chamber 54 to the exposure position and the film roll chamber 55 is changed halfway, the film 53 is scratched. As a result, the pressing force on the rear cover 52 of the film 53 is partially increased due to the unnatural bending in the vicinity of the portion A shown in FIG. Was found to be damaged by the dimples.

SUMMARY OF THE INVENTION 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 in which the back of the film is not damaged without increasing the external dimensions. .

[0008]

In order to achieve the above object, a film unit with a lens according to the first aspect of the present invention is provided with an unexposed photographic film in advance, and provided with a photographic mechanism such as a photographic lens and a shutter. A lens-equipped film unit comprising a main body, a front cover and a rear cover for covering the main body from front and rear, wherein the main body comprises an exposure frame for regulating an exposure range of the film and film rolls on both sides of the exposure frame. And a patrone chamber, and a rail surface is formed above and below the exposure frame for supporting the film from above and below the exposure range, and a front surface of the rear cover is opposed to each of the rail surfaces. and a support surface for supporting the back of the film outside the exposure range is formed therebetween these support surfaces, exposure range surface facing the exposure range of the film In the lens-fitted photo film unit is provided, wherein the support surface at both ends of the exposure frame
It protrudes to the front side and dents to the rear side at the center of the exposure frame.
Rutotomoni formed by Uni curved, the exposure range facing surface
Between the film roll room and the patrone room.
It is recessed and formed lower than the holding surface, and the exposure range
At the position facing the center of the exposure frame on the facing surface,
Height that does not protrude toward the exposure frame,
A support portion for supporting the film only in the vicinity thereof along the vertical direction including the optical axis is provided .

According to a second aspect of the present invention, in the film unit with the lens, the surface facing the exposure range is a film roll chamber.
Smooth curved surface continuously to the border with the patrone room
Formed at the boundary and toward the support
It is characterized in that the amount of depression from the surface to the rear side is gradually increased .

[0010]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 3 showing the appearance of a film unit with a lens according to the present invention, the unit main body 2 is mainly formed of plastic, and the whole is covered with a package 3.
The package 3 is used to clean the appearance of the lens-fitted film unit, and a paper box or the like having an outer surface printed thereon is used. The package 3 is provided with holes for exposing a photographing lens 4, a shutter button 5, a winding knob 6, a finder window 7, and a display window 8 for confirming the number of remaining films. You can do it.

As shown in FIG. 1, the unit main body 2 comprises a main body 9, an unexposed film 10 and a cartridge 11 housed therein, and a front cover 12 and a rear cover 13 which cover the front and rear. The patrone 1 in the main body 9
1 and a film roll chamber 15 for accommodating a film roll 10a in which the film 10 drawn from the patrone 11 is rolled. The unexposed film 10 drawn from the patrone 11 is spread between the patrone chamber 14 and the film roll chamber 15, and its rear surface is covered by the rear cover 13.
Covered.

The film 10 positioned as described above
An exposure unit 16 for exposing the main body 9 is fixed to the front surface of the main body 9. The main body 9 to which the exposure unit 16 is fixed is further covered on its front surface with the front cover 12,
A photographing light beam passing through the photographing opening 19 is exposed to the film 10 via the photographing lens 4 and the exposure unit 16. The taking lens 4 includes a lens holder 20 provided in the exposure unit 16 and a taking opening 1 formed in the front cover 12.
9, and is positioned such that the imaging optical axis is perpendicularly incident on the center of the lens. The front cover 12 is locked by a locking claw 18 or the like provided on the main body 9. At this time, since the guide member 21 is provided, the front cover 12 can be smoothly connected without being displaced.

The unit main body 2 is connected to the main body 9 (front cover 12).
In FIG. 2, which shows a state in which the rear cover 13 is disassembled, and an opening 9 extending from the back surface to the bottom surface.
a is formed, and the shape of the rear cover 13 is determined so as to light-tightly shield the opening 9a. As described above, the patrone chamber 14 and the film roll chamber 15 are provided in the main body 9 so as to sandwich the exposure frame 23, and the fork 6 a integrally formed below the hoisting knob 6 projects from the upper wall of the patrone chamber 14. ing. Film rails 27 and 28 are provided above and below the exposure frame 23, and support the upper and lower portions of the film 10 from the emulsion side of the film 10 so that the exposure range is not damaged. Film rail 2
Reference numerals 7 and 28 denote a shape (a radius of curvature of 100 mm) in which a middle portion is raised toward the rear cover 13 to correct aberration of the photographing lens 4.
It has become. Note that a sprocket 29 of the exposure unit 16 projects above the film rail 27.

As shown in FIGS. 1 and 4, the front surface of the rear cover 13 is located at a position facing the film rails 27 and 28.
To support the film 10 in cooperation with the rails 27 and 28.
Support surface 25, 26 is formed. This support surface 2
Reference numerals 5 and 26 denote the upper and lower portions of the film 10 outside the exposure range.
Support from the surface side. As a result, the film 10
It is positioned at the exposure position. These support surfaces 25, 26
The exposure frame 23 corresponds to the film rails 27 and 28.
From the position corresponding to the center of the to the position corresponding to both ends
, The support surfaces 25 and 26 are raised to the front side.
It is formed so as to be curved. On a part of the support surface 25,
A recess 30 is provided for receiving the projecting portion of the sprocket 29. The film 1 is provided between the support surfaces 25 and 26.
An exposure range facing surface 24 facing the exposure range of 0 is formed.
ing. At the center of the exposure area facing surface 24, a file
Along the width direction of the arm 10 that provided the dimples 31 are three rows. Dimples 31 of this is in the vertical direction including the optical axis
It functions as a support for supporting the film 10. others
As shown in FIG. 7, the height of the dimple 31 is
It is almost the same height as 5 and 26. In addition, this height
Means that the dimple 31 is about 0.1 mm lower
You may.

[0015] As shown in FIG .
The patrone room 14 and the film room
In each direction with the chamber 15, there is a point of inflection.
It is formed with a smooth curved surface. Also during this time
The height of the exposure range facing surface 24 is higher than that of the support surfaces 25 and 26.
Is also formed low. The supporting surfaces 25 and 26 and the exposure range
The difference in height from the surrounding opposing surface 24 is determined at both ends of the exposure frame 23.
This is particularly noticeable at a position opposed to. (See Fig. 8
See).

At the bottom of the rear cover 13, a patrone chamber cover 34 and a film roll chamber cover 35 are provided. Even after the main body 9 is covered with the rear cover 13, the patrone chamber lid 34 and the film roll chamber lid 35 are opened,
The bottom openings of the patrone chamber 14 and the film roll chamber 15 can be exposed. Therefore, if the patrone chamber lid 34 is opened after photographing, the patrone 11 containing the exposed film 10 can be easily taken out. Of course, when the patrone chamber cover 34 and the film roll chamber cover 35 are closed, the light shielding of the unit body 9 is completely maintained.

The operation of the thus-configured film unit with lens will be described. After confirming that the shutter is charged by rotating the winding knob 6, the photographer frames the subject through the finder window 7. When the shutter button 5 is pressed, the shutter blades of the well-known exposure unit 16 provided in the main body 9 open and close, exposing the photographic light beam incident from the photographic lens 4 onto the film 10. The film 10 is held in the exposure frame 23 by the film rails 27 and 28 and the support surfaces 25 and 26.
Accordingly, the subject image is satisfactorily exposed on the film 10 because it is curved and spread so as to correct the aberration of the taking lens 4. Also, a position facing the center of the exposure frame 23.
Light of the film 10 by the dimples 31
The distortion in the vertical direction including the axis is regulated.

When one photographing operation is completed, the photographer rotates the winding knob 6 again for the next photographing operation and winds the photographed film 10 into the cartridge 11. On this occasion,
Film 10, since it is fed is supported outside the exposure range on the supporting surface 25 and 26, exposure of the film 10 ranges unit
The portion is not damaged by the exposure area facing surface 24 . In particular, when the film 10 is fed, scratches are most likely to occur.
At both ends of the support surfaces 25 and 26,
24 is formed sufficiently lower than the support surfaces 25 and 26.
Contact between the film 10 and the exposure area facing surface 24
Can be avoided. Also, the width of the film 10 is
The exposure range of the film 10 is curved in the
Even if the contact with the circumference facing surface 24, an exposure range counter
The surface 24 includes the patrone chamber 14 and the film roll chamber 15
Has a smooth curved surface without inflection points
Therefore, it is possible to more reliably prevent the exposure area from being damaged. Further, a part of the exposure range facing surface 24 is used as a support surface.
25 and 26, the film 10
The contact area between the film and the rear cover 13 is reduced, and the film is fed.
The force can be reduced. Also, since the height of the dimples 31 is the same as that of the support surfaces 25 and 26 or 0.1 mm lower, the back surface of the film 10 is not strongly rubbed.

[0019]

[Table 1]

Table 1 shows a comparison between the conventional film unit with a lens and the film unit with a lens according to the present invention in terms of the rate of occurrence of scratches and the accuracy of the image plane. According to this result, in the film unit with a lens according to the present invention, it is possible to prevent the occurrence of scratches without lowering the accuracy of the image plane, and to increase the outer dimensions of the unit body 2 without increasing the external dimensions of the unit body 2. It can be said that the structure is not damaged. Also, if the film regulating surface 24 is released by 0.6 mm uniformly over the entire surface, the accuracy of the image plane slightly fluctuates. Therefore, the height of the dimple 31 is
It can be said that the same as 5, 26 or about 0.1 mm lower is better.

In this embodiment, the exposure area facing surface 24 is used.
Of but a dimple 31 is provided as a support portion to the central portion, de
The dimple 31 may be removed . For example, the dimple 31 may be removed and the central wall surface of the exposure range facing surface 24 may be the same as the support surfaces 25 and 26 or lower by about 0.1 mm.
And may be used as a support.

[0022]

As described above, in the film unit with a lens according to the present invention , the supporting surface is located at both ends of the exposure frame and at the front side.
Raised and curved so that it is concave most rearward at the center of the exposure frame
And the surface facing the exposure range is
From the support surface between the Lumroll room and the patrone room
Is also recessed and formed low on the back side, and
The position facing the center of the exposure frame is more exposed than the support surface.
It has a height that does not protrude to the frame side, and is near the center of the exposure frame.
Supports the film along the vertical direction including the optical axis
Since the portion is provided, it is possible to provide a film unit with a lens having a structure that does not damage the exposed portion on the back surface of the film. At the same time, the contact area between the film and the rear cover is reduced, so that the film feeding force can be reduced. Further, a film roll chamber and a surface facing the exposure range are provided.
With a smooth curved surface continuously to the border with the patrone room
Formed, and the support surface
Since the amount of depression from the back side to the rear side is gradually increased, the occurrence of film scratches can be more reliably prevented. Furthermore, since the exposure range opposing surface is formed without following the curvature of the support surface, it is not necessary to project the film roll chamber and the patrone chamber forward, and as a result, it is possible to prevent an increase in the thickness of the film unit. it can.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a lens-fitted film unit embodying the present invention.

FIG. 2 is an exploded perspective view of the film unit with a lens shown in FIG.

FIG. 3 is an external perspective view of the film unit with a lens shown in FIG. 1;

FIG. 4 is a plan view of a rear cover of the lens-fitted film unit shown in FIG. 1;

FIG. 5 is a sectional view of the film unit with a lens shown in FIG. 1;

FIG. 6 is a sectional view of a lens-fitted film unit having an ideal film path.

FIG. 7 is a cross-sectional view of a main part of the film unit with a lens shown in FIG.

8 is a cross-sectional view of a main part of the film unit with a lens shown in FIG. 1 shifted from the center of the optical axis.

FIG. 9 is an explanatory diagram showing a location where a film is scratched in a conventional film unit with a lens.

[Explanation of symbols]

2 Unit Main Body 9 Main Body 10 Film 11 Patrone 12 Front Cover 13 Rear Cover 14 Patrone Chamber 15 Film Roll Chamber 23 Exposure Frame 24 Exposure Range Opposing Surface 25, 26 Support Surface 27, 28 Film Rail 31 Dimple

Claims (2)

(57) [Claims] 1. An unexposed photographic film is loaded in advance,
A film unit with a lens comprising a main body provided with a photographic mechanism such as a photographic lens and a shutter, and a front cover and a rear cover which cover the main body from front and rear, wherein the main body regulates an exposure range of the film. An exposure frame, and a film roll chamber and a patrone chamber on both sides of the exposure frame. Rails are formed above and below the exposure frame to support the film from above and below the exposure range. on the front of a support surface for supporting the back of the film outside the exposure range by pairs <br/> direction to each of the rail surface, it is formed therebetween these support surfaces, face the exposure range of the film In the film unit with a lens provided with an exposure range opposing surface to be provided, the support surface is raised to the front side at both ends of the exposure frame,
Formed curved to dent the most rear side in a middle portion of the exposure frame
Is Rutotomoni, the exposure range facing surface, the film roll chamber and patrol
It is recessed and formed lower than the support surface between the chamber and the support surface.
And faces the center of the exposure frame on the surface facing the exposure range.
The position has a height that does not protrude toward the exposure frame side from the support surface.
And, the lens-fitted photo film unit, wherein a supporting portion for supporting the film along the vertical direction are provided including the optical axis only in the vicinity of the central portion of the exposure frame. 2. A film roll chamber, wherein the surface facing the exposure area is a film roll chamber.
And smooth music continuously to the border with the patrone room
And the support is formed toward the boundary.
2. The lens-fitted film unit according to claim 1, wherein the amount of depression from the holding surface to the rear side is gradually increased .