1. A flat panel display comprising:
a vacuum envelope having an at least partially transparent front glass and a substrate arranged to oppose said front glass;
a cathode electrode having an electron-emitting source and arranged on said substrate;
a gate electrode structure having an electron-passing hole and arranged between said front glass and said substrate;
a phosphor film and anode which are stacked on said front glass; and
a plurality of support members which are formed with the same height on a surface of said substrate which opposes said gate electrode structure and support said gate electrode structure.
2. A flat panel display according to claim 1, wherein said support members extend in one direction along a surface of said substrate and are formed to be spaced apart from each other by a predetermined distance.
3. A flat panel display according to claim 2, further comprising a plurality of first members which are formed on a surface of said gate electrode structure which opposes said substrate and are interposed between said substrate and said gate electrode structure,
wherein said support members are combined in gaps of said first members.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
What is claimed is:
1. A small optical microphonesensor for measuring distances to, andor physical properties of, a reflective surface, comprising:
a source of light coupled to a light waveguide for transmitting a light beam through said waveguide;
said waveguide having at one of its ends a pointed face with an angle determined by Snell’s Law of Refraction
4
sin
1
sin
2
=
n
2
n
1
wherein:
1 is the angle of travel of said light beam through the waveguide media;
2 is the angle of travel of said light beam in a second media when exiting from said pointed face, and
n1 and n2 are the light indices of said light waveguide media and said second media;
said reflective surface being disposed at an optimal distance from said pointed face as determined by the angle 2;
said waveguide having, at its outer surface, at least adjacent to said pointed face, means for preventing light waves impinging on said surface from being reflected back into said waveguide, and
a light detector arranged to receive the light reflected from said surface.
2. The optical microphonesensor as claimed in claim 1, wherein said light waveguide has a first portion proximal to said pointed face and a second portion distal to said pointed face, said light source and said light detector being coupled to said second portion.
3. The optical microphonesensor as claimed in claim 2, wherein at least one of said light source and said light detector is embedded in said second portion.
4. The optical microphonesensor as claimed in claim 2, wherein said second portion is a split portion, said light source is coupled to one part of said split portion, and said light detector is coupled to another part of said split portion.
5. The optical microphonesensor as claimed in claim 4, wherein at least said second portion is constituted by optical fibers.
6. The optical microphonesensor as claimed in claim 4, further comprising a splitter coupled between said first and second portions.
7. The optical microphonesensor as claimed in claim 2, further comprising an opaque partition extending between said light source and said light detector.
8. The optical microphonesensor as claimed in claim 6, wherein said light source and said light detector are laterally displaced from each other.
9. The optical microphonesensor as claimed in claim 2, wherein said light source is centrally located in said second portion and said light detector is coupled below a partition separating the light source from the detector, so as to receive reflected light passing through said light waveguide around said partition.
10. The optical microphonesensor as claimed in claim 1, wherein said reflective surface is a membrane.
11. The optical microphonesensor as claimed in claim 10, wherein said membrane is provided, at least at its central surface, with a highly reflective coating.
12. The optical microphonesensor as claimed in claim 1, wherein said means for preventing light waves from being reflected is a light-absorbing material coated on the outer surface of said waveguide.
13. The optical microphonesensor as claimed in claim 1, wherein said means for preventing light waves from being reflected is obtained by machining the outer surface of said waveguide.