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EP0178719A1 Expired / Lapsed EP ⏱️ 0.0 years remaining

Optical device

Assignee: Koninklijke Philips NV
•
Filing: 1985-10-03
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Granted: —
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Expires: 2005-10-03
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Abstract

Abstract In an optical device an objective (11) can be moved relative to a frame (1) along its optical axis (13) in parallel guide means (3, 5) by means of an electro-magnetic actuating device. The actuating device comprises first actuating means (21) connected to the frame and second actuating means (23) connected to the objective (11) and which cooperate with said first actuating means via an air gap (25). When used as a focussing device in an optical disc player, the reactive forces on the first means may generate mechanical vibration in the player which can degrade tracking and thereby increase the risk of cross-talk between adjacent tracks. To reduce vibration, the first actuating means (21) are arranged in a mount (27) which is supported by a leaf-spring-shaped damping element (29) which is secured to the frame (1).

Inventors

  • 👤 Robert Nestor Joseph Van Sluys
  • 👤 Johannes Joseph Martinus Schoenmakers

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-09 04:43
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/08; G11B7/09; G11B33/00; G11B33/02; G11B7/0925; G11B7/093; G11B7/0932

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 90 words
An optical device comprising - an axially movable objective with an optical axis, - a frame carrying guide means for the axial movements of the objective, and - an electro-magnetic actuating device for the objective, which actuating device comprises first actuating means arranged concentrically around the objective and supported resiliently on the frame in an annular mount which is secured to the frame by a leaf-spring-shaped damping element, and second actuating means which are connected to the objective and which are spaced from the actuating means by an annular gap.
Claim 2
Dependent Claim 90 words
An optical device comprising - an axially movable objective with an optical axis, - a frame carrying guide means for the axial movements of the objective, and - an electro-magnetic actuating device for the objective, which actuating device comprises first actuating means arranged concentrically around the objective and supported resiliently on the frame in an annular mount which is secured to the frame by a leaf-spring-shaped damping element, and second actuating means which are connected to the objective and which are spaced from the actuating means by an annular gap.
Claim 3
Dependent Claim 23 words
An optical device as claimed in Claim 1, wherein the annular mount and the leaf-spring-shaped element are constructed as a one-piece injection-moulded product.
Claim 4
Dependent Claim 43 words
An optical device as claimed in Claim 1 or 2, wherein the leaf-spring-shaped element is interposed between two parallel blade springs which support the objective, the end of the leaf-spring-shaped element which is remote from the mount being secured between the blade springs.
Claim 5
Dependent Claim 36 words
An optical device as claimed in Claim 3, wherein the blade springs are provided with a moulded-on fixing portion at their ends which are remote from the objective and to which the leaf-spring-shaped element is secured.

References Cited (Backward Citations)

EP0077581A1 Cited
EP0097402A1 Cited
GB2126750A Cited
DE3344262A1 Cited
EP0115666A2 Cited

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