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Mirror with adjustable focal distance
| Details |
Inventors: Cobarg, Claus Christian;
Assignee: Braun Aktiengesellschaft (Kronberg, Taunus, DT)
Primary Examiner: Willis; Davis L.
Assistant Examiner:
Attorney, Agent or Firm: Marmorek; Ernest F.
A mirror is provided having an adjustable focal length. The mirror includes a tubular frame in which is mounted a pair of end walls, either one or both of which may be transparent, and an internal, flexible wall that divides the frame member into two separate chambers. Where one transparent end wall is provided, the flexible, internal wall has a single reflecting surface in opposition thereto. Where two transparent end walls are provided, the flexible internal wall has two oppositely facing reflecting surfaces. A conduit provides direct communication between both chambers and a reversible pump is in communication with said conduit for selectively producing controllable pressures in the two chambers. |
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DETAILED DESCRIPTION I claim: 1.
A mirror having an adjustable focal length, said mirror comprising the combination of an elongated, tubular frame member, a first pair of wall members closing the ends of said frame member wherein at least one of said first pair of wall members is transparent, a second, flexible wall positioned within said frame member and having at least one reflecting surface on at least a portion thereof, said reflecting surface portion being in opposition to said transparent one of said first pair of wall members, said second flexible wall dividing said frame member into separate chambers, conduit means communicating directly with both said chambers and a reversible pump in communication with said conduit means whereby the gas volumes in said chambers can be pumped from one to the other for selectively producing controllable pressures in said chambers.
2.
The mirror according to claim 1 wherein both said first pair of wall members are transparent.
3.
The mirror according to claim 2 wherein said second, flexible wall has two oppositely facing reflective surfaces.
Description:
The invention relates to a mirror having an adjustable focal length especially to a cosmetic or automobile mirror having two walls spaced with respect to each other at a distance and extending in planes running parallel with respect to each other and which are connected over their edges directly or by a frame portion and which enclose a hollow space and in which one of the walls is provided with a reflecting surface and in which one of the wall surfaces is deformable and wherein means are provided for the making of a controlled variable pressure in the hollow space, such as by a pump the suction or pressure channel of which terminates in the hollow space.
Reflecting surfaces from elastically deformable metal foils and also from elastically deformable synthetic foil material coated with an appropriate metal, such as preferably aluminum, are known.
A cosmetic mirror having an adjustable focal length is also known (Swiss Pat
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