Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
124 words
An optical device comprising: - a frame; - an axially movable objective with an optical axis, - a parallel guide arrangement for the axial guidance of the objective; and - an electromagnetic actuating device for axially moving the objective, which device comprises first actuating means connected to the objective and second actuating means arranged on the frame, which first and second actuating means axially co-operate with each other in an air gap with a magnetic field which is oriented transversely of the optical axis, characterized in that axially resilient damping means are interposed between the frame and at least a part of the second actuating means, for damping the axial forces exerted on the frame by the said part of the second actuating means.
Claim 2
Dependent Claim
124 words
An optical device comprising: - a frame; - an axially movable objective with an optical axis, - a parallel guide arrangement for the axial guidance of the objective; and - an electromagnetic actuating device for axially moving the objective, which device comprises first actuating means connected to the objective and second actuating means arranged on the frame, which first and second actuating means axially co-operate with each other in an air gap with a magnetic field which is oriented transversely of the optical axis, characterized in that axially resilient damping means are interposed between the frame and at least a part of the second actuating means, for damping the axial forces exerted on the frame by the said part of the second actuating means.
Claim 3
Dependent Claim
28 words
An optical device as claimed in Claim 1, characterized in that the frame is provided with a parallel guide for the axial guidance of the second actuating means.
Claim 4
Dependent Claim
42 words
An optical device as claimed in Claim 1, of the type in which the parallel guide for the objective comprises a bearing bush, characterized in that the bearing bush is rigidly secured to the frame and is made of a non-magnetizable material.
Claim 5
Dependent Claim
19 words
An optical device as claimed in Claim 1, characterized in that the damping means are made of butyl rubber.
Claim 6
Dependent Claim
137 words
An optical device as claimed in Claim 1, of the type in which the second actuating means comprise: - an axially magnetized annular permanent magnet which is arranged concentrically around the objective and - a soft-iron yoke comprising pole-pieces disposed on opposite sides of the annular magnet and a soft-iron sleeve which is connected to one of the pole-pieces and which is spaced from the other pole-piece by an annular gap, the first actuating means comprising an annular coil which moves in the annular gap of said soft-iron yoke, characterized in that - the second actuating means are entirely resiliently supported resiliently on the frame, and - the resilient damping means comprise: - leaf-spring means connected to the second actuating means and to the frame, and - rubber isolating means between the frame and the leaf-spring means.
Claim 7
Dependent Claim
58 words
An optical device as claimed in Claim 5, characterized in that the leaf-spring means comprise a single integrally formed leaf-spring member which comprises a plurality of leaf springs which extend along or substantial ly tangentially to a circle concentric with the axis of the objective and which are separated from the remainder of said member by punched-out slots.