Viewing angle lens

• US 5,982,550 A
• Filed: 06/17/1998
• Issued: 11/09/1999
• Est. Priority Date: 06/17/1998
• Status: Expired due to Term

• Current Assignee: Chrysler Group LLC (Stellantis NV)
• Original Assignee: Chrylser Corporation
• Inventors: Wright, Charles, VanDerlofske, John, Brundage, Douglas L., Green, Dewayne E.
• Primary Examiner(s): Epps, Georgia
• Assistant Examiner(s): Thompson, Timothy J
• Application Number:
  US09/098,874
• Time in Patent Office: 510 Days
• Field of Search: 359/618, 340/461
• US Class Current: 359/618
• CPC Class Codes: G02B 2027/0118 comprising devices for improving the contrast of the display / brillance control visibility
• CPC Class Codes: G02B 2027/0169 Supporting or connecting means other than the external walls
• CPC Class Codes: G02B 27/0101 characterised by optical features G02B27/0172 takes precedence

Abstract

The present invention provides a secondary lens between the display lens and the vacuum florescent display. Both the lenses have an index of refraction greater than 1 which results in a momentary change in the viewing angle while the light passes through each lens. Since two lenses are used, the overall effective lens thickness for effective light shifting is increased while the cross sectional thickness of each lens remains uniform. Preferably, each lens is made of a polycarbonate material and has an index of refraction of 1.59. In another aspect of the present invention, the display lens is constructed of a smoke material and the secondary lens is clear.

Claims

1. A lens system for a vacuum fluorescent display, comprising:

a first lens having a first index of refraction, said first index of refraction being larger than an index of refraction of ambient air;

a secondary lens having a second index of refraction, said secondary lens positioned rearward of and spaced from said first lens, said second index of refraction being larger than said index of refraction of ambient air;

said vacuum fluorescent display mounted in an instrument panel of a vehicle, said vacuum fluorescent display positioned under a protrusion such that said protrusion obstructs some light being emitted from said vacuum fluorescent display, said vacuum fluorescent display positioned rearward and spaced from said secondary lens; and

said first lens and said secondary lens bending at least some of said light obstructed by said protrusion around said protrusion to increase a maximum viewing angle of said vacuum fluorescent display.

2. The lens system as claimed in claim 1, wherein the second index of refraction is less than the first index of refraction.

3. The lens system as claimed in claim 1, wherein the second lens is made of polycarbonate.

4. The lens system as claimed in claim 1, wherein the first lens is made of polycarbonate.

5. The lens system as claimed in claim 1, wherein said first lens and said second lens have cross sections of uniform thickness.

6. The lens system as claimed in claim 1, wherein said first lens and said second lens are supported in said instrument panel by a radio bezel.

7. The lens system as claimed in claim 1, wherein said vacuum fluorescent display is a radio display.

8. The lens system as claimed in claim 1, wherein the first lens is made of a smoked material such that light exiting the first lens has a lower brightness than light entering the first lens, the second lens being made of a clear material such that light exiting the second lens maintains substantially the same brightness as light entering the second lens.

9. The lens system as claimed in claim 1, further comprising said vehicle, said vacuum fluorescent display mounted in said vehicle at a level substantially lower than a line of sight of an occupant seated in said vehicle.

10. The lens system as claimed in claim 9, wherein said vehicle is an automobile.

11. A lens system for a vacuum fluorescent display, comprising:

at least a first lens having a first index of refraction, said first index of refraction being larger than an index of refraction of ambient air;

said vacuum fluorescent display, said vacuum fluorescent display mounted in an instrument panel of a vehicle and positioned rearward and spaced from said first lens, said vacuum fluorescent display positioned under a protrusion such that said protrusion obstructs some light being emitted from said vacuum fluorescent display; and

said first lens bending at least some of said light obstructed by said protrusion around said protrusion to increase a maximum viewing angle of said vacuum fluorescent display.

12. An automobile accessory adapted to be mounted in an instrument panel of an automobile, said automobile accessory comprising:

a first lens having a first index of refraction, said first index of refraction being larger than an index of refraction of ambient air; and

a secondary lens having a second index of refraction, said secondary lens positioned rearward of and spaced from said first lens, said second index of refraction being larger than an index of refraction of ambient air.