1. A joint exerciser comprising a support adapted to receive the lower leg and foot of a patient, a frame having an incline and a carriage permitting movement of the support on the incline, the support comprising substantially orthogonal supporting surfaces respectively for the foot and for the lower leg, and said supporting surfaces being each adapted for independent support by said carriage.
2. An exerciser according to claim 1 wherein said carriage is alternatively attachable to the underside of said supporting surfaces.
3. An exerciser according to claim 2 wherein said carriage comprises an axle adapted for snap-fitting engagement with a respective supporting surface.
4. An exerciser according to claim 1 wherein said incline comprises space parallel tubes, and said carriage comprises rolling elements having grooves engageable with and guided by said tubes.
5. An exerciser according to claim 4 wherein said carriage comprises a symmetrical cranked axle having wheels at the respective ends thereof.
6. An exerciser according to claim 1 wherein said frame comprises a continuous cranked tube.
7. An exerciser according to claim 1 wherein said frame comprises telescope tubular members, and said incline is adjustable by relative movement of said members.
8. An exerciser according to claim 1 wherein the supporting surface for the lower leg comprises a lower portion for supporting the lower portion of the lower leg and an upper portion for supporting the upper portion of the lower leg, the upper portion and lower portion being attached for relative sliding movement in the length direction of the leg.
9. An exerciser according to claim 8 wherein said upper portion includes a plurality of forks engageable in respective close fitting recesses of said lower portion.
10. An exerciser according to claim 1 and further including a fence attachable to said frame and defining travel stops for said carriage.
11. An exerciser according to claim 10 wherein said fence surrounds said carriage sufficiently to prevent disengagement from said incline.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. An electrostatic speaker, comprising:
a vibrating film;
an electrode portion disposed on a surface of the vibrating film and joined with the vibrating film; and
a conductive backplate spaced a distance from the electrode portion, the conductive backplate forming a plurality of holes, the vibrating film being deformed and vibrated to generate and release sound through the holes due to a variation of an electric field generated between the conductive backplate and the electrode portion, wherein the conductive backplate is covered by a polymer layer serving as a protective film.
2. The electrostatic speaker of claim 1, wherein the vibrating film is an electret film.
3. The electrostatic speaker of claim 1, wherein the polymer layer is selected from a group consisting of a thermosetting polymer and a thermoplastic polymer.
4. The electrostatic speaker of claim 1, wherein the polymer layer contains elements selected from a group consisting of oxygen, nitrogen, silicon, sulfur, phosphor, and halogen.
5. The electrostatic speaker of claim 1, wherein the polymer layer comprises a compound having an unsaturated bond.
6. The electrostatic speaker of claim 1, wherein the polymer layer is selected from a group consisting of a foam polymer and a porous polymer.
7. The electrostatic speaker of claim 1, wherein the polymer layer is selected from a group consisting of an aliphatic polymer, an aromatic polymer, a polymer having an aromatic ring, and their mixtures.
8. The electrostatic speaker of claim 1, wherein the polymer layer is in a form selected from a group consisting of coating, wax, and adhesive.
9. The electrostatic speaker of claim 8, wherein at least one of the coating, the wax, and the adhesive comprises an additive agent.
10. The electrostatic speaker of claim 9, wherein the additive agent is selected from a group consisting of an antioxidant, a colorant, an UV absorber, a fire retardant, a fungicide, a silicon oil, an antimicrobial, a dispersant, an anti-foam agent, a coupling agent, a leveling agent, a plasticizer, an anti-sagging agent, a lubricating agent, a thickener, and an inorganic filler.
11. The electrostatic speaker of claim 8, wherein the polymer layer is a polymer selected from a group consisting of a rubber, a polyurethane (PU), an acrylic resin, a polyvinyl alcohol (PVA), an epoxy resin, a thermoplastic elastomer (TPE), a synthetic resin, and their mixtures.
12. The electrostatic speaker of claim 8, wherein the polymer layer is a polymer selected from a group consisting of a solvent type and a water type.
13. The electrostatic speaker of claim 1, wherein the polymer layer is a multi-layer structure and each layer is made of a polymeric material.
14. The electrostatic speaker of claim 1, wherein a thickness of the polymer layer is less than 200 micrometers.
15. The electrostatic speaker of claim 1, wherein the conductive backplate is a mesh selected from a metal mesh, a metal-coated plastic mesh, a metal-coated rubber mesh, a plate having conductive nanotubes, and a composite mesh or a mix-woven mesh manufactured therefrom.
16. The electrostatic speaker of claim 15, wherein a number of holes of the mesh is between 20 and 2000.
17. The electrostatic speaker of claim 1, wherein the holes have different sizes of aperture.
18. An electrostatic speaker, comprising:
a first vibrating film and a second vibrating film;
an electrode portion joined with the first vibrating film and the second vibrating film; and
a first conductive backplate and a second conductive backplate, disposed at opposite sides of the electrode portion and respectively spaced from the electrode portion by a distance, each of the two conductive backplates forming a plurality of holes, the first vibrating film and the second vibrating film being deformed and vibrated to generate and release sound through the holes due to a variation of an electric field generated between the electrode portion and the two conductive backplates, wherein each of the two conductive backplates is covered by a polymer layer serving as a protective film.
19. A conductive backplate of an electrostatic speaker, the conductive backplate having a plurality of holes, a sound being released through the holes, wherein the conductive backplate is covered by a polymer layer serving as a protective film.