Photography – Plural image recording – Simultaneous recording of plural distinct subjects
Reexamination Certificate
1998-12-17
2001-03-27
Gray, David M. (Department: 2851)
Photography
Plural image recording
Simultaneous recording of plural distinct subjects
C396S333000, C396S429000
Reexamination Certificate
active
06208814
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a pre-exposing method for a photographic film, and to a manufacturing method for a lens-fitted film unit.
2. Description of the Related Art
There is a lens-fitted film unit as a kind of a camera. In the lens-fitted film unit, a simple photographing mechanism is included. This lens-fitted film unit is loaded with a photographic film and a film cartridge shell in advance. Such lens-fitted film unit is manufactured and merchandised by the assignee of the present application. Some of the lens-fitted film unit are loaded with a photographic film in which predetermined images are beforehand photographed by a pre-exposure. This pre-exposure is performed for a few frames of the photographic film, or for a part of the frame.
U.S. Pat. No. 5,546,146 discloses a pre-exposing method for performing a pre-exposure on a photographic film before the lens-fitted film unit is loaded with it. In this method, prior to loading the lens-fitted film unit, the photographic film is advanced frame by frame, and during the advancement, the pre-exposure is performed. After that, the lens-fitted film unit is loaded with the pre-exposed photographic film.
However, in the above-stated method, a process speed of the pre-exposure is slow. Thus, there arises a problem in that manufacturing efficiency of the lens-fitted film unit worsens because the lens-fitted film unit is loaded with the photographic film which is pre-exposed at slow speed.
SUMMARY OF THE INVENTION
In view of the foregoing, it is a primary object of the present invention to provide a pre-exposing method for a photographic film in which the pre-exposure is efficiently performed.
It is a second object of the present invention to provide a manufacturing method for a lens-fitted film unit in which manufacturing efficiency of the lens-fitted film unit is improved by efficiently performing the pre-exposure for a photographic film.
In order to achieve the above and other objects, the pre-exposing method for the photographic film and the manufacturing method for the lens-fitted film unit comprise a step of performing the pre-exposure every plural frames of the photographic film. In a preferred embodiment, the pre-exposure is performed every five frames.
When the pre-exposure is performed for the photographic film, the photographic film is advanced out of a cartridge shell. The advanced photographic film is pre-exposed every five frames. By performing the pre-exposure for the plural frames at the same time, a process speed of the pre-exposure becomes fast in comparison with that of a conventional method in which the pre-exposure is performed one frame by one frame.
The pre-exposed photographic film is rolled as a film roll, and is contained in the lens-fitted film unit together with the cartridge shell. At this time, the film roll is contained in a film roll chamber, and the cartridge shell is contained in the cartridge chamber.
The process speed of the pre-exposure is improved so as to be fast. Accordingly, manufacturing efficiency of the lens-fitted film unit is also improved.
REFERENCES:
patent: 5111224 (1992-05-01), Spector
patent: 5187512 (1993-02-01), Kirkendall
patent: 5343265 (1994-08-01), Oi et al.
patent: 5546146 (1996-08-01), Dobbs et al.
patent: 5758216 (1998-05-01), Arnold
patent: 5835795 (1998-11-01), Craig et al.
Fuji Photo Film Co. , Ltd.
Gray David M.
Young & Thompson
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