Apparatus and method for recording and displaying a three-dimensional image

• US 4,598,973 A
• Filed: 03/07/1984
• Issued: 07/08/1986
• Est. Priority Date: 03/07/1984
• Status: Expired due to Fees

• Current Assignee: Greenleaf, James F.
• Original Assignee: Greenleaf, James F.
• Inventors: Greenleaf, James F.
• Primary Examiner(s): Arnold, Bruce Y.
• Assistant Examiner(s): Shapiro, B. S.
• Application Number:
  US06/587,270
• Time in Patent Office: 853 Days
• Field of Search: 350/3.6, 350/3.67, 350/3.81, 350/3.64
• US Class Current: 359/3
• CPC Class Codes: G02F 1/3538 for optical phase conjugation controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation using optical phase conjugation H01S3/10076
• CPC Class Codes: G03H 1/06 using incoherent light
• CPC Class Codes: Y10S 359/90 Methods

Abstract

An apparatus and method for recording and displaying a three-dimensional image is disclosed. A high resolution, thick film emulsion (50) is positioned in contact with a phase-conjugate mirror (60). The emulsion (50) is exposed to light from a light source (20) which is reflected off of a three-dimensional object (30). Upon exposure to the light from the light source (20) each ray of light (10) will transverse the emulsion (50) and be reflected from the phase-conjugate mirror (60) so as to exactly retrace its path back through the emulsion (50). The incident light waves (10'"'"') and their reflected light rays (70'"'"') will expose the emulsion (50) in the form of an interference pattern or wave form (80'"'"'). Once exposed, the emulsion (50) is developed in the customary manner. The developed emulsion (100) will pass only light rays of a frequency (color) and direction similar to that which the emulsion (50) was originally exposed. Accordingly, a three-dimensional image is displayed to the viewer (130).

Claims

1. An apparatus for recording a three-dimensional image of an object illuminated by a light source, comprising:

(a) a housing having a front end and a back end;

(b) an emulsion;

(c) phase-conjugate mirror means for reflecting light directly back on its original path of incidence, said emulsion and said phase-conjugate mirror means supported within said housing, said emulsion being juxtaposed with said phase-conjugate mirror means, and being positioned in front of said phase-conjugate mirror means between the front end of said housing and said phase-conjugate mirror means;

(d) means for retaining said emulsion in contact with said phase-conjugate mirror means; and

(e) shutter means positioned proximate the front end of said housing for exposing said emulsion to the illuminated object for a predetermined period of time.

2. An apparatus in accordance with claim 1, wherein the thickness of said emulsion is at least several times the wavelength of the light source being utilized to illuminate the object.

3. An apparatus in accordance with claim 1, wherein said phase-conjugate mirror means is permanantly mounted in said housing, said emulsion being removable from said housing.

4. An apparatus in accordance with claim 1, wherein said retaining means includes a glass plate, onto which said emulsion is coated as with typical glass plate backed emulsions.

5. An apparatus in accordance with claim 1, wherein said retaining means is positioned in front of said emulsion, said emulsion being positioned between said retaining means and said phase-conjugate mirror means, said retaining means being transparent to enable light to pass therethrough.

6. An apparatus in accordance with claim 5, wherein said transparent retaining means includes anti-reflective means for preventing reflection of light from said retaining means.

7. An apparatus in accordance with claim 1, wherein the phase-conjugate mirror means includes a myriad of corner reflectors such that the size of each reflector is on the order of a desired resolution in the final image, said corner reflectors being oriented such that light is reflected directly back on its original path of incidence.

8. A method for recording a three-dimensional-like image comprising the steps of:

(a) illuminating with a light source an object whose image is to be recorded;

(b) transmitting light reflected off the object through a photographic emulsion;

(c) reflecting said light directly back through said emulsion on its original path of incidence by use of phase-conjugate mirror means; and

(d) developing said photographic emulsion.

9. A method according to claim 8, wherein the light is reflected from said conjugate mirror means made from corner reflectors which reflect light directly back through said emulsion on its original path of incidence, the size of each corner reflector being on the order of a desired resolution in the final image.

10. A method according to claim 8, wherein said emulsion is exposed to the light reflected off the object for sufficient time duration such that a portion of said light is passing through said emulsion in a first direction at the same time that another portion of said light having previously passed through said first direction and reflected off said phase-conjugate mirror means, is passing through said emulsion for a second time in a second direction substantially anti-parallel to said first direction.

11. A method according to claim 8, wherein the light is transmitted through said emulsion having a thickness which is several times the wavelength of the light from said light source.

12. A method for displaying a three-dimensional-like image comprising:

(a) reflecting light from a source off an object whose image is to be recorded;

(b) passing said light through a photographic emulsion having a front side and a back side;

(c) reflecting said light directly back on its original path through said emulsion by use of phase-conjugate mirror means juxtaposed with the back side of said photographic emulsion;

(d) developing said photographic emulsion to create a developed photographic emulsion; and

(e) viewing said developed photographic emulsion by illuminating said developed photographic emulsion, said developed photographic emulsion passing only light of frequency and direction similar to the light which previously exposed said photographic emulsion so as to generate a three-dimensional image.

13. A method in accordance with claim 12, wherein said developed photographic emulsion is removed from said phase-conjugate mirror means prior to viewing, a light for viewing purposes being positioned in front of said developed photographic emulsion.

14. A method in accordance with claim 12, wherein said phase-conjugate mirror means is made up of a myriad of reflectors which reflect light back on its original path through said emulsion.

15. A camera apparatus, comprising:

(a) a housing having a front end and a back end, said front end including an aperture for admitting light from an object;

(b) a photosensitized emulsion mounted on a transparent emulsion support means proximate the back end of said housing;

(c) phase-conjugate mirror means juxtaposed with said emulsion and positioned between said emulsion and the back end of the housing;

(d) shutter means interconnected to said housing proximate the front end thereof for opening and closing the aperture to selectively expose said emulsion; and

(e) means for controlling said shutter means.