Vehicle identification camera

• US 4,855,770 A
• Filed: 09/09/1988
• Issued: 08/08/1989
• Est. Priority Date: 09/09/1988
• Status: Expired due to Term

• Current Assignee: Senshin Capital LLC (Intellectual Ventures LLC)
• Original Assignee: Polaroid Corporation (PLR IP Holdings LLC)
• Inventors: Mauchan, Donald E., Slavitter, Frederick
• Primary Examiner(s): Gellner, Michael L.
• Application Number:
  US07/242,178
• Time in Patent Office: 333 Days
• Field of Search: 354/75, 354/76, 354/81, 354/295, 354/126
• US Class Current: 396/544
• CPC Class Codes: G03B 15/03 Combinations of cameras with lighting apparatus; Flash units
• CPC Class Codes: G03B 17/48 adapted for combination with other photographic or optical apparatus

Abstract

A vehicle identification camera arrangement for photographing a vehicle identification number (VIN) plate through a vehicle windshield includes a housing having an object window at its distal end forwardly of the lens and an aperture stop adjoining the lens with the length of housing from the lens establishing the distance to the windshield. The aperture stop sufficiently reduces the aperture to increase the depth of field to encompass the variations in distance of the VIN plate behind the vehicle windshield. Preferably, the arrangement is provided as an adapter housing whose interior is divided into an upper lightbox section and a lower exposure section by an opaque baffle and a diffusing screen. The lightbox section receives flash illumination and directs it at a sharp angle with respect to the optical axis of the camera objective to illuminate the VIN plate through the windshield with a minimum of reflection from the windshield along the camera exposure axis. Optionally, the housing includes an arrangement for mounting an information label adjacent the object window to provide for the production of composite VIN plate and information image exposures.

Claims

1. Photographic apparatus for close-up photography of an object through a transparent medium, said apparatus comprising:

a housing having a first section defining an exposure chamber including a lens located in a wall of said first section for directing image forming rays into said chamber from a photographic scene located forwardly along the optical axis of said lens, and a second section extending forwardly of said lens a given predetermined distance along said optical axis and terminating at its distal end in an object window defining an apparatus mounting plane configured for locating said lens at said predetermined distance from said transparent medium when said distal end of said second section is placed in engagement with said transparent medium;

flash illuminating and directing means carried by said housing for producing a flash of illumination directed at the distal end of said second section to illuminate the scene behind the medium; and

said distal end of said second section defining said camera mounting plane at an oblique angle to said optical axis to permit exposure of the scene area located on said optical axis behind the medium while minimizing reflection of said flash from the medium along said optical axis.

2. The apparatus of claim 1 wherein said second section is an opaque tubular member.

3. The apparatus of claim 1 including an elongated aperture stop of narrow width configured to be aligned with the longitudinal axis of said object for providing a large depth of field so as to accommodate varied distances of the object behind the medium.

4. The apparatus of claim 3 wherein the object is a narrow, elongated member and said aperture stop is a slit having its longitudinal axis aligned with a principle axis of said object window.

5. The apparatus of claim 1, further comprising label holding means adjacent said object window of supporting a label in a position to be photographed along with the object.

6. The apparatus of claim 1 including a viewfinder for viewing the scene, and preview means for illuminating the object so as to enable a camera operator to view the object through the medium when the apparatus is in an operative position over the medium.

7. The apparatus of claim 1 wherein the object is a vehicle identification number plate mounted behind a vehicle windshield and the transparent medium is the vehicle windshield.

8. An adapter for use with a camera for closeup photography of a narrow, elongated object, said camera having an objective lens, a given lens optical axis and a source of flash illumination, said adapter comprising a housing carrying in overlying relationship a close-up lens and aperture stop, means for releasably attaching said housing to said camera with said close-up lens and aperture stop in overlying relation to the lens of said camera, and said aperture stop is a narrow strip configured for increasing the depth of field of said camera while accommodating photographing of said narrow object.

10. The adapter of claim 8 including means for receiving illumination from said source and for directing at least a portion of the received illumination at a sharp angle to said given optical axis so as to form a shadow effect about the identification number on said vehicle identification number plate to thereby enhance its readability in the photographic image.

11. The adapter of claim 10 wherein said directing means includes means for directing the received illumination through said object window.

12. The adapter of claim 8 further comprising label holding means for supporting a label in a position to be photographed along with the vehicle identification number plate, and said illumination directing means includes means for additionally directing flash illumination to said label holding means.

13. The adapter of claim 8 wherein said camera further includes a viewfinder, said adapter further comprising:

preview means for illuminating the vehicle identification number plate so as to enable a camera operator to view the vehicle identification number plate through the viewfinder while the camera and adapter are in an operative position over the plate.

14. The adapter of claim 8 wherein said illumination directing means comprises a light box section of said housing having a diffusing screen adjoining said one end of said housing.

15. The adapter of claim 14 wherein said housing includes an opaque baffle which divides a portion of the interior of the housing into said light box section and an exposure section, and said light box section includes a reflector located near said one end of said housing for directing the flash illumination produced by said source of flash illumination through said diffusing screen at a sharp angle to the optical axis of the objective lens.

16. The adapter of claim 15 wherein the diffusing screen includes means for compensating for an offset location of the source of flash illumination.

17. The adapter of claim 8 wherein said one end of said housing is slanted at an oblique angle to said optical axis to minimize reflection from said windshield along said optical axis.

18. The adapter of claim 17 wherein said aperture stop comprises an opaque member having a medial slit running parallel to an edge of said object window.

9. A vehicle identification adapter for use with a camera having an objective lens, a given lens optical axis and a source of flash illumination to photograph a vehicle identification number plate through a vehicle windshield, said adapter comprising:

a housing having an object window in one end, a close-up lens and an aperture stop in an other end, means located at said one end for mounting the camera on said one end with the lens optical axis exit ending through said close-up lens, said stop and said object window, and said housing having a length establishing a predetermined distance between the camera and said windshield when said camera and adapter are in an operative position over said windshield with said one end placed against said windshield and said camera mounted on said other end; and

said close-up lens and aperture stop being coaxially supported in said other end of said housing in alignment with said given lens optical axis and said aperture stop sufficiently reduces the camera aperture so as to increase the depth of field of the camera to adequately encompass expected variations in the distance of the vehicle identification number plate behind the vehicle windshield when said camera is mounted on said adapter.

19. An adapter for photographing a vehicle identification number plate through the windshield of a vehicle using an instant camera having an objective lens and a built-in electronic flash unit, said adapter comprising:

a housing having top, bottom, first and second side, front and rear walls defining an interior;

the interior being separated into an upper illumination chamber and a lower exposure chamber by a planar baffle and a diffusing screen;

said front wall having a rectangular object window and the plane of said front wall is oriented at an acute angle with respect to said bottom wall;

said rear wall supporting a light window, a viewfinder window, a photocell window, a close-up lens and aperture stop arrangement, and a mounting clamp adapted to secure said adapter to said camera.

20. The adapter of claim 19 further comprising a preview illuminator mounted with said exposure chamber and including an actuating element accessible through an opening in one of said side walls.

21. The adapter of claim 20 including means for mounting an information label adjacent said object window.