Genuineness detecting system and method for using genuineness detecting film

An article with an authenticity identifying film comprising:

• an authenticity identifying film comprising a reflective film comprising a liquid crystal film having a cholesteric phase and having a circularly polarized light selectivity to reflect only either of right-handed circularly polarized light or left-handed circularly polarized light of incident light to produce reflected light, the reflective film being provided with a hologram forming part that reflects circularly polarized light of the same circular polarization as that of the reflected light in a direction different from that of the reflected light to form a holographic image, the reflective film comprising a front surface on the light incidence side and a rear surface on the side opposite to the light incidence side, the front surface of the reflective film being a flat surface, and the hologram forming part being provided on the rear surface of the reflective film causing the thickness of the reflective film to vary due to the thickness variation of the hologram forming part;
• an article to which the authenticity identifying film is bonded;
• and
• a photograph interposed between the article and the authenticity identifying film.

An authenticity identifying system comprising:

• an authenticity identifying film comprising a reflective film comprising a liquid crystal film having a cholesteric phase and having a circularly polarized light selectivity to reflect only either of right-handed circularly polarized light or left-handed circularly polarized light of incident light to produce reflected light, the reflective film being provided with a hologram forming part that reflects circularly polarized light of the same circular polarization as that of the reflected light in a direction different from that of the reflected light to form a holographic image, the reflective film comprising a front surface on the light incidence side and a rear surface on the side opposite to the light incidence side, the front surface of the reflective film being a flat surface, and the hologram forming part being provided on the rear surface of the reflective film;
• a light source unit for irradiating the authenticity identifying film with light;
• and
• a detecting unit for detecting the reflected light from the authenticity identifying film and the holographic forming part causing the thickness of the reflective film to vary due to the thickness variation of the hologram forming part.

A method of using an authenticity identifying film comprising a reflective film comprising a liquid crystal film having a cholesteric phase and having a circularly polarized light selectively to reflect only either of right-handed circularly polarized light or left-handed circularly polarized light of incident light to produce reflected light, the reflective film being provided with a hologram forming part that reflects circularly polarized light of the same circular polarization as that of the reflected light in a direction different from that of the reflected light to from a holographic image, the reflective film comprising a front surface on the light incidence side and a rear surface on the side opposite to the light incidence side, the front surface of the reflective film being a flat surface, and the hologram forming part being provided on the rear surface of the reflective film causing the thickness of the reflective film to vary due to the thickness variation of the hologram forming part;

• said method comprising the steps of:
• irradiating the authenticity identifying film with right-handed circularly polarized light and left-handed circularly polarized light respectively;
• and
• deciding that the authenticity identifying film is authentic when either right-handed circularly polarized light or left-handed circularly polarized light, which is reflected from the reflective film, can be detected and the other circularly polarized light, which is not reflected from the reflective film, cannot be detected.

A method of using an authenticity identifying film comprising a reflective film comprising a liquid crystal film having a cholesteric phase and having a circularly polarized light selectivity to reflect only either of right-handed circularly polarized light or left-handed circularly polarized light of incident light to produce reflected light, the reflective film being provided with a hologram forming part that reflects circularly polarized light of the same circular polarization as that of the reflected light in a direction different from that of the reflected light to form a holographic image, the reflective film comprising a front surface on the light incidence side and a rear surface on the side opposite to the light incidence side, the front surface of the reflective film being a flat surface, and the hologram forming part being provided on the rear surface of the reflective film causing the thickness of the reflective film to vary due to the thickness variation of the hologram forming part;

• said method comprising the steps of:
• irradiating the authenticity identifying film with light including right-handed circularly polarized light and left-handed circularly polarized light;
• and
• deciding that the authenticity identifying film is authentic when the holographic image from the authenticity identifying film can be read in a direction different from that of the reflected light.

A method of using an authenticity identifying film comprising a reflective film comprising a liquid crystal film having a cholesteric phase and having a circularly polarized light selectively to reflect only either of right-handed circularly polarized light or left-handed circularly polarized light of incident light to produce reflected light, the reflective film being provided with a hologram forming part that reflects circularly polarized light of the same circular polarization as that of the reflected light in a direction different from that of the reflected light to form a holographic image, the reflective film comprising a flat surface on the light incidence side and a rear surface on the side opposite to the light incidence side, the front surface on the reflective film being a flat surface, and the hologram forming part being provided on the rear surface of the reflective film causing the thickness of the reflective film to vary due to the thickness variation of the hologram forming part;

• said method comprising the steps of:
• irradiating the authenticity identifying film with light including right-handed circularly polarized light and left-handed circularly polarized light;
• and
• deciding that the authenticity identifying film is authentic when the film has a part that cannot be visually recognized when the authenticity identifying film is observed visually through an examining tool having region that transmits of right-handed circularly polarized light and region transmits left-handed circularly polarized light.

A method of using an authenticity identifying film comprising a liquid crystal film having a cholesteric phase and having a circularly polarized light selectivity to reflect only either of right-handed circularly polarized light or left-handed circularly polarized light of incident light to produce reflected light, the reflective film being provided with a hologram forming part that reflects circularly polarized light of the same circular polarization as that of the reflected light in a direction different from that of the reflected light to form a holographic image, the reflective film comprising a flat surface on the light incidence side and a rear surface on the side opposite to the light incidence side, the front surface on the reflective film being a flat surface, and the hologram forming part being provided on the rear surface of the reflective film causing the thickness of the reflective film to vary due to the thickness variation of the hologram forming part;

• said method comprising the steps of:
• irradiating the authenticity identifying film with light including right-handed circularly polarized light and left-handed circularly polarized light;
• measuring a light intensity difference between intensities of right-handed circularly polarized light and that of left-handed circularly polarized light transmitted by an examining tool having region that transmits of right-handed circularly polarized light and region transmits left-handed circularly polarized light;
• and
• deciding whether or not the authenticity identifying film is authentic on the basis of the light intensity difference.

An article with an authenticity identifying film comprising:

• an authenticity identifying film comprising a reflective film comprising a liquid crystal film having a cholesteric phase and having a circularly polarized light selectivity to reflect only either of right-handed circularly polarized light or left-handed circularly polarized light of incident light to produce reflected light, and a hologram forming layer laminated to the reflective film, having a hologram forming part that reflects circularly polarized light of the opposite circular polarization to that of the reflected light in a direction different from that of the reflected light to form a holographic image, the reflective film comprising a front surface on the light incidence side and a rear surface on the side opposite to the light incidence side, both the front surface and the rear surface of the reflective film being flat surfaces, and the hologram forming layer having a front surface and a rear surface being laminated on the rear surface of the reflective film, the front surface of the hologram forming layer being a flat surface and the hologram forming part being provided on the rear surface of the hologram forming layer;
• an article to which the authenticity identifying film is bonded;
• and
• a photograph interposed between the article and the authenticity identifying film.

An authenticity identifying system comprising:

• an authenticity identifying film comprising a reflective film comprising a liquid crystal film having a cholesteric phase and having a circularly polarized light selectively to reflect only either of right-handed circularly polarized light or left-handed circularly polarized light of incident light to produce reflected light, and a hologram forming layer laminated to the reflective film, having a hologram forming part that reflects circularly polarized light of the opposite circular polarization to that of the reflected light in a direction different from that of the reflected light to form a holographic image, the reflective film comprising a front surface on the light incidence side and a rear surface on the side opposite to the light incidence side, both the front surface and the rear surface of the reflective film being flat surfaces, and the hologram forming layer having a front surface and a rear surface being laminated on the rear surface of the reflective film, the front surface of the hologram forming layer being a flat surface, and the hologram forming part being provided on the rear surface of the hologram forming layer;
• a light source unit for irradiating the authenticity identifying film with light;
• and
• a detecting unit for detecting the reflected light from the authenticity identifying film and the holographic image causing the thickness of the reflective film to vary due to the thickness variation of the hologram forming part.

A method of using an authenticity identifying film comprising a reflective film comprising a liquid crystal film having a cholesteric phase and having a circularly polarized light selectivity to reflect only either of right-handed circularly polarized light or left-handed circularly polarized light of incident light to produce reflected light, and a hologram forming layer laminated to the reflective film, having a hologram forming part that reflects circularly polarized light of circular polarization opposite that of the reflected light in a direction different from that of the reflected light to form a holographic image, the reflective film comprising a front surface on the light incidence side and a rear surface on the side opposite to the light incidence side, both the front surface and the rear surface of the reflective film being flat surfaces, and the hologram forming layer having a front surface and a rear surface being laminated on the rear surface of the reflective film, the front surface of the hologram forming layer being a flat surface, and the hologram forming part being provided on the rear surface of the hologram forming layer;

• said method comprising the steps of:
• irradiating the authenticity identifying film with right-handed circularly polarized light and left-handed circularly polarized light respectively;
• and
• deciding that the authenticity identifying film is authentic when either right-handed circularly polarized light or left-handed circularly polarized light, which is reflected from the reflective film, can be detected and the other circularly polarized light, which is not reflected from the reflective film, cannot be detected.

A method of using an authenticity identifying film comprising a reflective film comprising a liquid crystal film having a cholesteric phase and having a circularly polarized light selectivity to reflect only either of right-handed circularly polarized light or left-handed circularly polarized light of incident light to produce reflected light, and a hologram forming layer laminated to the reflective film, having a hologram forming part that reflects circularly polarized light of circular polarization opposite that of the reflected light in a direction different from that of the reflected light to form a holographic image, the reflective film comprising a front surface on the light incidence side and a rear surface on the side opposite to the light incidence side, both the front surface and the rear surface of the reflective film being flat surfaces, and the hologram forming layer having a front surface and a rear surface being laminated on the rear surface of the reflective film,

• the front surface of the hologram forming layer being a flat surface, and the hologram forming part being provided on the rear surface of the hologram forming layer;
• said method comprising the steps of:
• irradiating the authenticity identifying film with light including right-handed circularly polarized light and left-handed circularly polarized light;
• and
• deciding that the authenticity identifying film is authentic when the holographic image from the authenticity identifying film can be read in a direction different from that of the reflected light.

A method of using an authenticity identifying film comprising a reflective film comprising a liquid crystal film having a cholesteric phase and having a circularly polarized light selectivity to reflect only either of right-handed circularly polarized light or left-handed circularly polarized light of incident light to produce reflected light, and a hologram forming layer laminated to the reflective film, having a hologram forming part that reflects circularly polarized light of circular polarization opposite that of the reflected light in a direction different from that of the reflected light to form a holographic image, the reflective film comprising a flat surface on the light incidence side and a rear surface on the side opposite to the light incidence side, both the front surface and the rear surface on the reflective film being flat surfaces, and the hologram forming layer having a front surface and a rear surface being laminated on the rear surface of the reflective film, the front surface of the hologram forming layer being a flat surface, and the hologram forming part being provided on the rear surface of the hologram forming layer;

• said method comprising the steps of:
• irradiating the authenticity identifying film with light including right-handed circularly polarized light and left-handed circularly polarized light;
• and
• deciding that the authenticity identifying film is authentic when the film has a part that cannot be visually recognized when the authenticity identifying film is observed visually through an examining tool having region that transmits of right-handed circularly polarized light and region transmits left-handed circularly polarized light.

A method of using an authenticity identifying film comprising a reflective film comprising a liquid crystal film having a cholesteric phase and having a circularly polarized light selectivity to reflect only either of right-handed circularly polarized light or left-handed circularly polarized light of incident light to produce reflected light, and a hologram forming layer laminated to the reflective firm, having a hologram forming part that reflects circularly polarized light of the opposite circular polarization to that of the reflected light in a direction different from that of the reflected light to form a holographic image, the reflective film comprising a flat surface on the light incidence side and a rear surface on the side opposite to the light incidence side, both the front surface and the rear surface on the reflective film being flat surfaces, and the hologram forming layer having a front surface and a rear surface being laminated on the rear surface of the reflective film, the front surface of the hologram forming layer being a flat surface, and the hologram forming part being provided on the rear surface of the hologram forming layer;

• said method comprising the steps of:
• irradiating the authenticity identifying film with light including right-handed circularly polarized light and left-handed circularly polarized light;
• measuring a light intensity difference between intensities of right-handed circularly polarized light and that of left-handed circularly polarized light transmitted by an examining tool having region that transmits of right-handed circularly polarized light and region transmits left-handed circularly polarized light;
• and
• deciding whether or not the authenticity identifying film is authentic on the basis of the light intensity difference.