Adhesive bonding and miscellaneous chemical manufacture – Delaminating processes adapted for specified product – Delaminating in preparation for post processing recycling step
Patent
1986-03-03
1987-06-02
Powell, William A.
Adhesive bonding and miscellaneous chemical manufacture
Delaminating processes adapted for specified product
Delaminating in preparation for post processing recycling step
1566591, 156668, 156904, 35016216, 35016221, 350167, 350409, 427165, 427271, 427287, 430 5, 430321, B44C 122, C03C 1500, C03C 2506
Patent
active
046700951
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a method for forming partial films at specified portions of surface having concavities and convexities or an uneven surface of an object or an optical-path-varying element such as a lens, a prism, a Fresnel plate or the like.
BACKGROUND ART
Various methods have been devised and demonstrated for forming partial films on a transparent sheet or plate made of glass or plastic, thereby defining portions through which light rays are transmitted and the other portions which inhibit the transmission of the light rays. In order to define the light-transmission portions and the non-light-transmission portions which are spaced apart from each other by a very small distance, it is useful to employ a photoetching process which is used to fabricate integrated circuits and so on.
According to the photoetching process, a plurality of precision photomasks must be used and registered with each other with an extremely high degree of accuracy.
However, it is very troublesome to define lighttransmission portions and non-light-transmission portions which are spaced apart from each other by a very small distance on glass or plastic three-dimensional bodies with uneven surfaces such as compound lenses, compound prisms, Fresnel lenses or lenticular plates (corrugated lenses) for forming three-dimensional photos, and glass or plastic Fresnel sheets or plates by such photoetching process. Furthermore, their considerably high coefficients of thermal expansion must be taken into consideration, so that the film coating process including the temperature control system becomes very complicated. As a result, they are not suited to be mass produced, whereby their costs become very high.
The present invention was made to overcome the above and other problems encountered when specified portions of an uneven surface of an object are coated with films and the object of the invention is to provide a method for forming partial films over an uneven surface of an object in which the uneven surface of the object, especially an optical-path-varying object such as a lens, prism, Fresnel plate or the like is irradiated with parallel, converged or diffused light rays coming from a specific direction and thereafter the uneven surface thus exposed to the light rays is subjected to etching and washing steps so that colored films (for instance, black films) are formed at specified portions of the uneven surface of the object which are spaced apart from each other by an extremely small distance, in a positive manner and at less cost without the use of photomasks, temperature controls, and precision steps which are required in the conventional methods.
DISCLOSURE OF THE INVENTION
According to the method for forming a partial film layer over an uneven surface of an object in accordance with the present invention, first, a photosensitive agent is applied to the entire uneven surface, thereby forming a photosensitive film; the uneven surface thus coated with the photosensitive agent is irradiated with the light rays emitted from an obliquely disposed light source in such a way that only the surface portions of the ridge portions which face the light source are exposed to the light rays while the remaining surface portions which do not face the light source are left unexposed to the light rays; and the photosensitive film thus treated is subjected to etching and washing steps so that the photosensitive film is left only at either the exposed or the unexposed portions.
BRIEF DESCRIPTION OF THE DRAWINGS
FIGS. 1 through 6 are views respectively showing examples of different optical-path-varying elements which are objects to which the method of the present invention can be applied;
FIG. 7 is a fragmentary sectional view showing one example of an optical-path-varying element coated with a photosensitive agent;
FIG. 8 is a fragmentary sectional view showing a state of projection of light onto the optical-path-varying element shown in FIG. 7;
FIG. 9 is a fragmentary sectional view showing another mode of light
REFERENCES:
patent: 3542453 (1970-11-01), Kantor
patent: 3658528 (1972-04-01), Berman et al.
patent: 3669673 (1972-06-01), Ih et al.
patent: 4405405 (1983-09-01), Fujii et al.
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