Elimination of internal reflections and diffractions from junctures in and at the periphery of, a segmented mirror

• US 4,609,266 A
• Filed: 08/20/1984
• Issued: 09/02/1986
• Est. Priority Date: 06/07/1982
• Status: Expired due to Fees

• Current Assignee: Roxor Corporation
• Original Assignee: Roxor Corporation
• Inventors: Blom, C. James
• Primary Examiner(s): Henry, Jon W.
• Application Number:
  US06/642,179
• Time in Patent Office: 743 Days
• Field of Search: 350/612, 350/613, 350/276 R, 350/276 SL, 350/277, 350/452, 350/417, 350/320, 264/2.5, 264/1.4, 427/164-168, 427/14.1, 427/27, 427/249, 427/250, 427/255.7, 427/265, 427/266
• US Class Current: 359/851
• CPC Class Codes: B29D 11/00596 Mirrors

Abstract

In a transparent molded segmented mirror having individual sectors on a transparent molding and comprising a myriad of reflecting surfaces at the rear side of the mirror away from the viewer, said surfaces located to produce, in the eyes of the viewer, a virtual image, or separate virtual images from separate portions of such molded mirror, there being zones separating the reflecting surfaces, the improvement comprising:

(a) a material coating said zones and which includes a light absorber,

(b) such material having approximately, the same index of refraction as the transparent molding,

(c) whereby undesirable reflections from said zone are substantially reduced, because light impinging thereon cannot be reflected, but is only absorbed.

Also, the thickness of light reflecting metallizing material defining the reflective surfaces may be thinned adjacent said zones, and the light absorptive coating may be applied over the thinned metallizing material; and the edges of the molding and of a glass backer may be coated with light absorptives material.

Claims

1. In the method of manufacturing a transparent mold segmented mirror having individual sectors on a transparent molding and comprising a myriad of metallized layers providing reflecting adjacent surfaces at the back side of the mirror away from the viewer, and oriented to produce, in the eyes of a viewer, a single virtual image, or separate virtual images from separate portions of such molded mirror, said layers having thinned peripheries, there being a network of zones separating the individual reflecting surfaces, the step that comprises

(a) substantially reducing undesirable reflections from said zones of separation by coating the back sides of said zones with material that includes a light absorber,

(b) the coating carried out to cover zones between reflecting surfaces and the thinned peripheries of said metallized reflecting layers.

2. The method of claim 1 wherein said material has substantially the same index of refraction as the molded material, and said absorber comprises a dispersed, light-absorbtive substance.

3. In method of claim 2 wherein said substance comprises particulate carbon, or lamp black.

4. The method of claim 1 wherein the coating is applied to said zones with thickness characterized in that light incident thereon from the transparent molding is absorbed before it can be reflected back into the transparent molding.

5. The method of claim 1 where the coating is applied to substantially the entire back side of the molding, away from the viewer.

6. The method of one of claims 1-5 where the coating is also applied to edges of the molding.

7. The method of claim 1 wherein a glass backer is provided to adhere to the flat, front, viewer side, of the molded mirror, and including the step of coating the edges of the glass backer with a material of substantially the same index of refraction as the glass backer, and which coating material contains a light absorber.

8. The method of claim 7 wherein said last named light absorber comprises a finely dispersed light absorbing material.

9. The method of claim 8 wherein said last named light absorbing material comprises carbon particulate.

10. In a transparent molded segmented mirror having individual sectors on a transparent molding and comprising a myriad of metallized layers providing reflecting adjacent surfaces at the back side of the mirror away from the viewer, said surfaces oriented to produce, in the eyes of the viewer, one virtual image, or separate virtual images from separate portions of such molded mirror, said layers having thinned peripheries, there being a network of zones separating the individual reflecting surfaces, the improvement comprising:

(a) a material coating the back sides of said zones, and which includes a light absorber,

(b) the coating covering zones between reflecting surfaces and the thinned peripheries of said metallized reflecting layers, whereby undesirable reflections from said zones are substantially reduced.

11. The mirror of claim 10 wherein said material has substantially the same index of refraction as the material of said molding, said absorber comprising a dispersed, light-absorbtive substance.

12. The mirror of claim 11 wherein said substance comprise carbon particulate.

13. The mirror of claim 10 wherein said coating has thickness characterized in that light incident thereon from the transparent molding is absorbed before it can be reflected back to the transparent molding.

14. The mirror of claim 10 wherein the coating is applied to substantially the entire back side of the molding, away from the viewer.

15. The mirror of one of claims 10-14 wherein the coating is also applied to edges of the molding.

16. The mirror of claim 10 for use in a vehicle, and having a front, surface, and a holding bracket, the bracket and surface having orientation that is essentially perpendicular to the vehicle'"'"'s direction of travel.

17. The mirror of claim 10 defining two flat segmented mirror sections, located in one bracket, said sections and brackets oriented to form a chevron pointed generally rearward to enable a rear view subtending more than 180°

.

18. The combination of claim 16 including said vehicle mounting the holding bracket so that said front surface is inclined from vertical, being tilted steeply toward the viewer.

19. The mirror of claim 10 wherein the mirror assembly also includes a transparent panel overlying the molding containing said reflecting surfaces and facing the viewer.

20. The mirror of claim 10 wherein said reflecting surfaces form multiple groups of said surfaces, one group located at a central portion of the mirror, and other groups located at left and right portions of the mirror.

21. The mirror of claim 20 wherein said surfaces of said one group are oriented to intercept light rays traveling forwardly from the rear of the vehicle, for reflection toward the viewer, said surfaces of the group at the left portion of the mirror oriented to reflect light rays traveling from the left flank of the vehicle toward the mirror, for reflection toward the viewer, and said surfaces of the group at the right portion of the mirror oriented to reflect light rays traveling from the right flank of the vehicle toward the mirror, for reflection toward the viewer.

22. The mirror of claim 20 wherein said mirror has transparent solid structure extending across and rearwardly of said myriad of surfaces.

23. The mirror of claim 22 wherein said solid structure includes a first molded layer extending adjacent said myriad of surfaces and a second layer overlying said first layer.