JP2585811Y2 - 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 in which a film is previously built in a unit body having a photographing function.

[0002]

2. Description of the Related Art A film unit with a lens is a type in which a film is stored in advance in a unit body incorporating a simple photographing mechanism and a winding mechanism, and is widely used because of its simple use and low cost. (Product name "Sharun is Hi" etc.). As described in Japanese Patent Application Laid-Open No. 64-544 or the like, such a film unit with a lens accommodates a patrone in a patrone chamber on the film winding side and forms an unexposed film in a roll shape and accommodates the film in a film roll chamber. Then, the exposed film is wrapped around the patrone every time a photograph is taken.

The work of storing a film in the unit body is performed in a dark room, but in order to simplify the work and reduce the number of parts, after the patrone and the film roll are loaded, one rear cover is removed. By attaching the film, the film is light-tightly stored in the unit body. For this reason, a film supporting surface is formed integrally with the rear cover in addition to a wall surface that covers the back side of the patrone chamber and the film roll chamber, and the film drawn out from the film roll chamber by the film supporting surface is viewed from the back. It is supported and positioned at the exposure position.

[0004]

[Problems to be solved by the invention] However, the film photographed by the conventional film unit with a lens includes:
Occasionally, the back, especially the back of the effective screen area, was scratched. Scratches in such places can have an adverse effect on printed photographs in extreme cases, which can cause deterioration in the quality of the photographs.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and has as its object to provide a film unit with a lens in which the back of the film is prevented from being scratched.

[0006]

According to the present invention, in order to achieve the above object, when a rolled film is pulled out to a film support surface, the film is extended in a cross section perpendicular to the film pulling direction so that the film extends toward the rear side. Focusing on the curling habit of deforming into a convex shape, focusing on the fact that such curling parts are strongly rubbed against the rear cover, making it easy for scratches to enter, and after the part of the cover approaches the film exit part of the film roll chamber, the curling This is to prevent it from rubbing strongly against the back of the film.

In order to prevent the back surface of the film exhibiting curling behavior from coming into strong contact with the rear cover by being pulled out of the film roll chamber, a part of the cover is exposed after approaching the film outlet of the film roll chamber. It is preferable to provide a guide portion for supporting the film from the back side at both edge portions outside the range, and a concave portion between these guide portions so as to prevent the back surface of the film from contacting the rear cover.

[0008]

FIG. 1 is an exploded view of a lens-fitted film unit according to the present invention. In FIG. 1, a unit main body 2 basically includes a front cover 3, a main body portion 4, and a rear cover 5. The main unit 4 has a film winding dial 6,
In addition to the photographing lens 7, the shutter mechanism 8, etc., a patrone room 9
And a film roll chamber 10 for accommodating a patrone 11 and a film roll 12a, respectively. By attaching the rear cover 5 to the back surface of the main body 3, the patrone chamber 9 and the film roll chamber 10 are in a light-tight state. In FIG. 1, a paper box used as an exterior cover is not shown.

As shown in the figure, a film support surface 16 is formed integrally with the rear cover 5 in addition to the wall surfaces 14 and 15 which are put on the back surfaces of the patrone chamber 9 and the film roll chamber 10, respectively. The film support surface 16 supports the film 12 pulled out of the film roll chamber 10 and extended at the exposure position from the back surface, and positions the film 12 at the exposure position. In addition, ribs 17 are provided above and below the wall surface 15, and similarly support the upper and lower side edges of the film roll 12 a in cooperation with the rib provided on the inner wall of the film roll chamber 10, so that the effective screen of the film To prevent scratches.

The wall surface 15 of the rear cover 5 and the film support surface 1
6, that is, a part of the cover 5 after approaching the film outlet of the film roll chamber 10, the wall surface 15 and the film support surface 16, as shown in detail in the cross section of the main part of FIG. 2. A concave portion 25 is formed at the boundary portion of. A rib 17 formed on the wall surface 15 is extended as a bridge portion 17a so as to sandwich the concave portion 25 up and down.
The guide portion supports the upper and lower side edges of the film 12 at positions deviated from the effective screen 2. The depth of the recess 25 is the wall surface 15
The bottom surface is a plane parallel to the rear cover 5 and is connected to the film support surface 16. The end of the concave portion 25 on the side of the wall surface 15 is located at a position 7.5 mm from a portion 15 a where the wall surface 15 is parallel to the rear cover 5.

As shown in FIG. 2 and FIG. 3 showing a cross section taken along the line BB, the exposure frame 20 formed on the back surface of the main body 4 is located substantially opposite to the concave portion 25. The film 12 pulled out of the film roll chamber 10 is sent to the exposure position after passing between the film guide rail 20a provided on the exposure frame 20 and the concave portion 25. At the exposure position, the film support surface 16 and the film support surface 16 are in contact with each other. It is positioned by the guide rail 20a.

The operation of the above configuration will be described. Although the film roll 12a is housed in a substantially cylindrical shape in the film roll chamber 10, when the film 12 is pulled out from the film roll chamber 10 and is to be spread on the film support surface 16, as shown in FIG. Immediately after being pulled out from the film roll chamber 10, the film 12 exhibits a curl behavior such as bulging to the rear side. This curl habit appears particularly at the boundary between the film roll 12a and the extended film 12, so that the film 12 is strongly pressed against the boundary between the wall surface 15 of the rear cover 5 and the film support surface 16. Become.

However, as described above, if the concave portion 25 is formed at the boundary between the wall surface 15 and the film support surface 16, even if the film 12 bends rearward due to the curl behavior, the curved portion is formed by the concave portion 25. The film 12 does not enter and rub against the rear cover 5, so that the film 12
Is not scratched on the back of the effective screen of the film 12 even when the film is pulled out. The depth of the recess 25 may be in the range of 0.3 to 1 mm from the wall surface 15, and the end of the recess 25 on the wall 15 side may be in the range of 0 to 10 mm from the portion 15 a. Good.

[0014]

As described above, according to the film unit with the lens of the present invention, after the film exit of the film roll chamber is approached, a part of the cover bulges to the rear side due to the curl behavior. Since the concave portion for receiving the rear surface is provided, the rear surface of the effective screen of the film does not come into contact with the rear cover, so that scratches can be prevented.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a film unit with a lens according to the present invention.

FIG. 2 is a partial sectional view showing a main part of the present invention.

FIG. 3 is a sectional view taken along line BB of FIG. 2;

[Explanation of symbols]

 2 Unit body 4 Body part 5 Rear cover 10 Film roll room 12 Film 15 Wall surface 16 Film support surface 17a Bridge part 25 recess

Continuation of the front page (56) References JP-A-64-544 (JP, A) JP-A-63-194256 (JP, A) JP-A-63-194255 (JP, A) , U) Fully open sho 63-66840 (JP, U) Fully open sho 63-90217 (JP, U) (58) Fields investigated (Int.Cl. ⁶ , DB name) G03C 3/00 G03B 17/00

Claims (1)

(57) [Scope of request for utility model registration] 1. A film roll chamber is provided in a unit main body provided with a photographing mechanism, a film formed in a roll shape is stored in the film roll chamber, and the rear face of the film is supported by a rear cover that covers the rear face of the film roll chamber. In the film unit with the lens as described above, a part of the rear cover approaching a film exit portion of the film roll chamber, a guide portion for supporting, from the back side, both edge portions deviating from the effective screen area of the film, A film unit with a lens, wherein a concave portion is provided between the guide portions so as to make the rear surface of the effective screen area of the film in a non-contact state.