Apparatus and method for imparting a succession of predetermined latent images on a strip of unexposed light sensitive film

• US 5,933,213 A
• Filed: 09/26/1995
• Issued: 08/03/1999
• Est. Priority Date: 09/26/1995
• Status: Expired due to Fees

• Current Assignee: Ferrania S.p.A.
• Original Assignee: Imation Corporation (Glassbridge Enterprises, Inc.)
• Inventors: Eddings, Tommy A., Siemer, Michael S.
• Primary Examiner(s): Metjahic, Safet
• Assistant Examiner(s): Chizmar, John
• Application Number:
  US08/534,048
• Time in Patent Office: 1,407 Days
• Field of Search: 355/27, 355/39, 355/40, 396/310, 396/315, 396/316, 396/318
• US Class Current: 355/40
• CPC Class Codes: G03B 27/521 Arrangements for applying a supplementary information onto the sensitive material, e.g. coding producing marks on the film in cameras G03B17/24

Abstract

Apparatus and method for imparting a succession of predetermined machine readable latent images on a strip of unexposed light sensitive film having a series of frames, the succession of latent images being individually indicative each of the series of frames of the film. A light source is adapted to be controlled at a rate associated for a particular type of film, the light source produces imaging light to which the film is sensitive. A ferroelectric liquid crystal array receives the imaging light, the ferroelectric liquid crystal array having a plurality of segments, each of the plurality of segments being individually switchable between opaque and transparent, the plurality of segments being formed so that the ferroelectric liquid crystal array can produce all of the predetermined latent images. Focusing means for focuses the imaging light which has passed through the ferroelectric liquid crystal array onto the strip of light sensitive film.

Claims

1. An apparatus for imparting a succession of predetermined latent images on a strip of unexposed light sensitive film having a series of frames, said succession of latent images being individually indicative each of said series of frames of said film, comprising:

a light source adapted to be controlled at a rate associated for a particular one of said type of said film, said light source producing imaging light to which said film is sensitive;

a ferroelectric liquid crystal array receiving said imaging light, said ferroelectric liquid crystal array having a plurality of segments, each of said plurality of segments being individually switchable between opaque and transparent, said plurality of segments being formed so that said ferroelectric liquid crystal array can produce said predetermined latent images;

focusing means for focusing said imaging light which has passed through said ferroelectric liquid crystal array onto said strip of light sensitive film.

2. An apparatus as in claim 1 which further comprises a filter disposed between said light source and said ferroelectric liquid crystal array, said filter being capable of color matching said imaging light from said light source to the light sensitivity of said light sensitive film.

3. An apparatus as in claim 2 which further comprises a condensing lens disposed between said filter and said ferroelectric liquid crystal array, said condensing lens capable of focusing said imaging light onto said ferroelectric liquid crystal array.

4. An apparatus as in claim 3 wherein said focusing means comprises a projection lens disposed in the optical path of said imaging light between said ferroelectric liquid crystal array and said light sensitive film.

5. An apparatus as in claim 1 wherein said plurality of segments of said ferroelectric liquid crystal array form a machine readable bar code indicative of an individual one of said series of frames.

6. An apparatus as in claim 5 wherein a first portion of said predetermined latent images represent information relating to a type of said light sensitive film and wherein a second portion of said predetermined latent images represent information relating to said individual one of said series of frames.

7. An apparatus as in claim 1 wherein said light source has an exposure time of not more than five microseconds.

8. An apparatus as in claim 1 which further comprises switching means operatively coupled to said ferroelectric liquid crystal array for setting each of said plurality of segments to be opaque or transparent.

9. A method for imparting a succession of predetermined latent images on a strip of unexposed light sensitive film having a series of frames, said succession of latent images being individually indicative each of said series of frames of said film, comprising:

strobing a light source adapted to be controlled at a rate associated for a particular one of said type of said film, said light source producing imaging light to which said film is sensitive;

setting a ferroelectric liquid crystal array receiving said imaging light, said ferroelectric liquid crystal array having a plurality of segments, each of said plurality of segments being individually switchable between opaque and transparent, said plurality of segments being formed so that said ferroelectric liquid crystal array can produce all of said predetermined latent images; and

focusing said imaging light which has passed through said ferroelectric liquid crystal array onto said strip of light sensitive film.

10. A method as in claim 9 which further comprises filtering said imaging light in order to color match said imaging light from said light source to the light sensitivity of said light sensitive film.

11. A method as in claim 10 which further comprises condensing said imaging light onto said ferroelectric liquid crystal array.

12. A method as in claim 11 wherein said focusing step uses a projection lens disposed in the optical path of said imaging light between said ferroelectric liquid crystal array and said light sensitive film.

13. A method as in claim 9 wherein said plurality of segments of said ferroelectric liquid crystal array form a machine readable bar code indicative of an individual one of said series of frames.

14. A method as in claim 13 wherein a first portion of said predetermined latent images represent information relating to a type of said light sensitive film and wherein a second portion of said predetermined latent images represent information relating to said individual one of said series of frames.

15. A method as in claim 9 wherein said strobing step has an exposure time of not more than five microseconds.

16. A method as in claim 9 which further comprises the step of setting each of said plurality of segments to be opaque or transparent.