JP2005338449A - Photo film unit with lens - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To increase waterproofing and dust-proofing effects in the opening of a shrink film in a photo film unit with a lens in which a camera unit body is coated with the shrink film. <P>SOLUTION: A projected line is disposed on the camera unit body incorporating an unexposed photographing film and having a photographing mechanism such as an imaging lens, in a position surrounding the opening of the shrink film. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a film unit with a lens in which a camera unit containing an unexposed photographic film is covered with a shrink film having an opening.

  The film unit with a lens is a simple camera with a photographic film in which an unexposed photographic film is loaded in advance on a camera unit body having a photographing mechanism such as a photographing lens. The lens-equipped film unit that has been photographed by the user is taken out at a camera store, developed, and printed. The lens-equipped film unit from which the film is taken out is collected and recovered by the manufacturer, and then disassembled and inspected. Reusable parts are incorporated into the camera unit body and reused. In addition to saving resources and energy, such as being reused as a resin molding material, consideration is given to the environment by minimizing disposal.

  This lens-attached film is disclosed as an effective technique for improving the function by waterproofing and dustproofing, or for facilitating the reuse of the member by preventing the camera unit body from becoming dirty or scratched (Patent Document 1). However, if a shrink film is present on the photographing optical path in front of the photographing lens, the imaging performance of the photographing lens may be impaired by the shrink film. Therefore, the front surface of the photographing lens is often avoided from being covered with the shrink film. For example, by providing an opening in the shrink film in advance and combining the opening so as to match the position of the photographing lens of the camera unit body, the shrink film is prevented from being present on the front surface of the photographing lens.

By the way, a fine gap may be formed in the overlapping portion between the end face of the shrink film and the main body at the opening of the shrink film, and water and dust may enter from the gap. Invasion of water and dust will reduce the effect of covering with shrink film, and to avoid this, an additional part is added to the opening near the photographic lens and sealed to prevent entry of water and dust. The technique (patent document 2) to do is disclosed. However, in the configuration in which such a new member is provided, there is a problem that the structure becomes complicated and the number of mounting steps increases.
Japanese Utility Model Publication No. 3-60342 JP-A-5-265141

  The present invention relates to a lens-coated film unit that is covered with a shrink film having an opening as described above, which improves the waterproof and dustproof effect at the opening of the shrink film and eliminates the need for separate parts for waterproofing and dustproofing. It is an object to provide an attached film unit.

  The inventor of the present application has found that the adhesiveness of the shrink film is improved by providing the shrink film or the recess in the shrink film of the camera unit main body, and the effect of preventing the intrusion of water and dust can be improved. The present invention is achieved by the following configurations described in the claims.

That is,
[[Claim 1] In a film unit with a lens in which an unexposed photographic film is incorporated and a camera unit body having a photographing mechanism such as a photographing lens is covered with a shrink film having an opening, the camera unit body includes the shrink film. A film unit with a lens, characterized by having a ridge at a position surrounding the opening.
[Claim 2] When the ridge has a substantially rectangular cross section, the width is w and the height is t,
0.5mm ≦ w ≦ 1mm
0.5mm ≦ t ≦ 1mm
Further, the distance s from the end face of the opening of the shrink film to the wall surface of the ridge is 2t ≦ s ≦ 4t
The film unit with a lens according to claim 1, wherein:
[Claim 3] In a film unit with a lens in which an unexposed photographic film is incorporated and a camera unit body having a photographing mechanism such as a photographing lens is covered with a shrink film having an opening, the camera unit body is formed of the shrink film. A film unit with a lens, characterized by having a recess in the opening position.
[Claim 4] When the depth of the recess is t, 0.5 mm ≦ t ≦ 1 mm
And the distance s from the end face of the opening is 2t ≦ s ≦ 4t
The lens-attached film unit according to claim 3, wherein the lens-attached film unit is provided in a range of ".

  According to the present invention, in a lens-fitted film unit covered with a shrink film, it becomes possible to enhance the waterproof and dustproof effect at the end face of the opening of the shrink film, and an additional part for waterproofing and dustproofing can be eliminated. .

  Hereinafter, the example of embodiment of the film unit with a lens in the present invention is described, referring to each figure.

  FIG. 1 is a perspective view showing a lens-fitted film unit as an example of the present invention.

  As shown in FIG. 1, the lens-fitted film unit 10 includes a camera unit main body 100 and a shrink film 200 that covers the camera unit main body 100. Here, the shrink film 200 has a circular opening 201 on the front surface of the photographing lens 110.

  FIG. 2 is a view showing the shrink film 200 and the camera unit main body 100. The shrink film 200 is a transparent plastic film having a property of shrinking when heated, and FIG. 2 (a) is the shrink film 200 in this embodiment, and a 0.05 mm thick film is formed into a cylindrical shape. A part of the opening 201 has a circular cutout 201. FIG. 2B shows the camera unit main body 100, which includes a photographing lens 110 and a viewfinder 120 on the front surface, a release button 130 on the top surface, and a film winding knob (not shown) for film winding operation on the back surface. Further, a ridge 101 is formed around the photographing lens. The inside of the camera unit main body 100 is kept in a light-tight state and is loaded with a photographic film. After the camera unit main body 100 is inserted into the shrink film 200 so that the position of the photographing lens coincides with the opening 201 of the shrink film 200 and then heated by hot air, the shrink film 200 contracts and adheres to and covers the camera unit main body 100. The form shown in FIG. In the lens-fitted film unit 10 shown in FIG. 1, the photographing lens 110 is located at the position of the opening 201 of the shrink film 200 and is not covered. Covering the photographic lens 110 with a shrink film is desirable to avoid shooting the subject through the shrink film, which may affect the imaging performance. It is configured not to be covered with a shrink film.

  In the lens-fitted film unit 10 shown in FIG. 1, when the user operates the release button 130, the shutter mechanism inside the camera unit operates, and the subject image formed by the photographing lens 110 is formed on the surface of the photographic film. Is done. Since the shrink film 200 is flexible, it does not hinder the user's operation of the release button 130. As described above, since the photographic lens 110 forms a subject image through the opening 201 of the shrink film 200, the shrink film 200 does not affect the image forming action of the photographic lens 110.

FIG. 3 is a view showing a ridge provided around the photographing lens 110 of the camera unit main body 100. FIG. 3A is a view of the photographic lens 110 and its periphery as viewed from the front side of the camera unit main body 100, and FIG. 3B is a cross-sectional view of the periphery of the photographic lens. As shown in FIG. 3A, a ridge 101 is formed around the photographing lens 110 of the camera unit main body 100. Here, 201 indicated by a two-dot chain line is an opening of the shrink film, and no shrink film exists in a range surrounded by the two-dot chain line 201. As shown in FIG. 3 (b), the ridge has a substantially rectangular cross section, where w and t are 0.5 mm ≦ w ≦ 1 mm when the width is w and the height is t.
0.5mm ≦ t ≦ 1mm
Is satisfied, and the distance s from the end face of the opening to the wall surface of the ridge is 2t ≦ s ≦ 4t
It has been confirmed that it is preferable to satisfy the above.
In the present embodiment, a convex strip 101 having a rectangular cross section with w = 1 mm and t = 0.5 mm is formed 1.5 mm inside the end surface of the opening 201 of the shrink film 200.

  FIG. 4 is a cross-sectional view showing the photographing lens 110 and the opening 201 of the shrink film 200 around the photographing lens 110. FIG. 4A is a view showing a state in which the camera unit main body 100 is inserted into the shrink film 200 with the photographing lens 110 aligned at the position of the opening 201, and the shrink film 200 gently covers the camera unit main body 100. FIG. 4B shows a state in which the shrink film 200 is contracted by heating, is in close contact with the camera unit main body 100, and is covered. The contracted shrink film 200 adheres to the camera unit main body 100 along the shape of the surface of the camera unit main body 100. The shrink film 200 is also in close contact with the ridge 101 and bends along the ridge 101. Due to such bending, the adhesion of the shrink film 200 is enhanced, and even if water or dust enters from the overlapping portion between the end surface portion of the opening 201 of the shrink film 200 and the camera unit main body 100, the intruded water and dust are bent. Progression is prevented at the part, and it does not proceed beyond the bent part. That is, the effect of preventing water and dust from entering the opening is improved.

FIG. 5 is a view showing a recess provided around the photographing lens 110 of the camera unit main body 100 in a different embodiment. FIG. 5A is a view of the photographic lens 110 and its periphery when viewed from the front side of the camera unit main body 100, and FIG. 5B is a cross-sectional view of the periphery of the photographic lens. As shown in FIG. 5A, a recess 102 is formed around the photographing lens 110 of the camera unit main body 100. Here, 201 indicated by a two-dot chain line is an opening of the shrink film, and no shrink film exists in a range surrounded by the two-dot chain line 201.
When the depth of the recess 102 from the surface of the camera unit main body 100 is t, t is 0.5 mm ≦ t ≦ 1 mm.
And the distance s from the end face of the opening is 2t ≦ s ≦ 4t
It is confirmed that it is preferable to form in the range of
In the present embodiment, a recess 102 having a depth t = 0.5 mm is formed from the end face of the opening to a position s = 2 mm.

  FIG. 6 is a cross-sectional view showing the photographic lens 110 in the different embodiment described above and the opening 201 of the shrink film 200 around it. FIG. 6A is a view showing a state in which the camera unit main body 100 is inserted into the shrink film 200 with the photographing lens 110 aligned at the position of the opening 201, and the shrink film 200 gently covers the camera unit main body 100. FIG. 6B shows a state in which the shrink film 200 is shrunk by heating, is in close contact with the camera unit main body 100, and is covered. The contracted shrink film 200 adheres to the camera unit main body 100 along the shape of the surface of the camera unit main body 100. The shrink film 200 is also in close contact with the recess 102 and bends along the recess 102. Due to such bending, the adhesion of the shrink film 200 is enhanced, and even if water or dust enters from the overlapping portion between the end surface portion of the opening 201 of the shrink film 200 and the camera unit main body 100, the intruded water and dust are bent. Progression is prevented at the part, and it does not proceed beyond the bent part. That is, the effect of preventing water and dust from entering the opening is improved.

  Although the opening in the above-described embodiment is an opening of the photographing lens unit, the present invention is not limited to the photographing lens, and it goes without saying that the present invention can also be applied to a case where an opening is provided in a winding operation unit, a finder unit, or the like.

It is a perspective view which shows the film unit with a lens of this invention. It is a figure which shows a shrink film and a camera unit main body. It is a figure which shows the protruding item | line provided around the imaging lens of the camera unit main body. It is sectional drawing which shows the relationship between a protruding item | line and opening when a camera unit main body and a shrink film are combined. It is a figure which shows the recess provided in the circumference | surroundings of the photographic lens of a camera unit main body. It is sectional drawing which shows the relationship between a recess and opening when a camera unit main body and a shrink film are combined.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Film unit with lens 100 Camera body unit 101 Convex strip 102 Concave 110 Shooting lens 120 Viewfinder 130 Release button 200 Shrink film 201 Shrink film opening

Claims (4)

In a film unit with a lens in which an unexposed photographic film is incorporated and a camera unit body having a photographing mechanism such as a photographing lens is covered with a shrink film having an opening,
The film unit with a lens, wherein the camera unit body has a ridge at a position surrounding an opening of the shrink film. The ridge has a substantially rectangular cross section, and when the width is w and the height is t,
0.5mm ≦ w ≦ 1mm
0.5mm ≦ t ≦ 1mm
Further, the distance s from the end face of the opening of the shrink film to the wall surface of the ridge is 2t ≦ s ≦ 4t
The film unit with a lens according to claim 1, wherein: In a film unit with a lens in which an unexposed photographic film is incorporated and a camera unit body having a photographing mechanism such as a photographing lens is covered with a shrink film having an opening,
The film unit with a lens, wherein the camera unit main body has a recess at an opening position of the shrink film. The depth of the recess is 0.5 mm ≦ t ≦ 1 mm where t is the depth.
And the distance s from the end face of the opening is 2t ≦ s ≦ 4t
The lens-attached film unit according to claim 3, wherein the lens-attached film unit is provided in a range of

Images