EP0048364A2
Expired / Lapsed
EP
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Piezoelectric light deflecting apparatus
Assignee: Erwin Sick GmbH Optik Elektronik
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Filing: 1981-09-03
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Granted: —
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Expires: 2001-09-03
Abstract
Abstract Piezoelectric light deflecting apparatus consists of first and second piezoceramic strips 11, 12 each of which has a clamped end and a free end 15. The strips 11, 12 are substantially aligned in one plane with their free ends 15 facing one another and spaced apart by a distance x. An AC voltage U having a frequency which differs significantly from the natural resonant frequency of the strips is used to energize the strips to execute oscillations so that their free ends are periodically displaced in counterphase to one another. A mirror 13 is mounted via flexible legs 14 to the free ends of the piezoceramic strips 11, 12 so that the mirror 13 executes a rotary oscillation as a result of the counterphase movements of the free ends of the piezoceramic strips.
Inventors
- 👤 Reinhard Lauer
- 👤 Dietmar Pfefferle
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 10:05
CPC Classifications
G; G02; G02B; G02B7/00; G02B7/18; G02B7/182; G02B7/1821
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
136 words
Piezoelectric light deflecting apparatus having a mirror which can be caused to execute a rotary oscillation by a piezoelectric device energized by an AC voltage, characterized in that two piezoceramic flexible strips (11, 12) each clamped at one end are arranged in a plane with their ends remote from the ends at which they are clamped lying opposite and spaced (x) apart from each other; in that the flexible strips are energized by an AC voltage which differs significantly from the resonant frequency of the flexible strips so that they oscillate in counterphase and in that the mirror (13) is arranged parallel to the two flexible strips (11, 12) in the region of their free ends and is connected to the free ends of the flexible strips in each case via a respective resilient member (14).
Claim 2
Dependent Claim
136 words
Piezoelectric light deflecting apparatus having a mirror which can be caused to execute a rotary oscillation by a piezoelectric device energized by an AC voltage, characterized in that two piezoceramic flexible strips (11, 12) each clamped at one end are arranged in a plane with their ends remote from the ends at which they are clamped lying opposite and spaced (x) apart from each other; in that the flexible strips are energized by an AC voltage which differs significantly from the resonant frequency of the flexible strips so that they oscillate in counterphase and in that the mirror (13) is arranged parallel to the two flexible strips (11, 12) in the region of their free ends and is connected to the free ends of the flexible strips in each case via a respective resilient member (14).
Claim 3
Dependent Claim
60 words
Apparatus in accordance with claim 1 and characterized in that each resilient member comprises one or more short flexible synthetic leg or legs (14) which is or are fastened to the free end of the associated flexible strip (11, 12) at right angles to the plane of the flexible strip (11, 12) and parallel to the free end faces thereof.
Claim 4
Dependent Claim
23 words
Apparatus in accordance with claim 2 and wherein each synthetic leg (14) is fastened to an end face of the associated flexible strip.
Claim 5
Dependent Claim
42 words
Apparatus in accordance with any one of the preceding claims and characterized in that said flexible strips are provided with centrally disposed metal electrodes which extend beyond said free ends and in that said resilient members are attached to said central electrodes.
Claim 6
Dependent Claim
28 words
Apparatus in accordance with any one of the preceding claims and characterized in that a feedback electrode (16)is arranged on at least one of the flexible strips (11,12).
Claim 7
Dependent Claim
27 words
Apparatus in accordance with claim 5 and wherein the or each said feedback electrode 16 is located in the central portion of the associated flexible strip (11,12).
Claim 8
Dependent Claim
41 words
Apparatus in accordance with any one of the preceding claims and characterized in that the two flexible strips (11, 12) are connected to a circuit arrangement consisting of an amplifier part (17), a charge amplifier (18) and an all-pass filter (19).
Claim 9
Dependent Claim
18 words
Apparatus in accordance with any one of the preceding claims and wherein said mirror is a plane mirror.
Claim 10
Dependent Claim
120 words
Piezoelectric light deflecting apparatus having a mirror which can be caused to execute a rotary oscillation by a piezoelectric device energized by an AC voltage, the apparatus being characterized by first and second piezoceramic strips each having a clamped end and a free end, said strips being substantially aligned in one plane with their free ends facing and spaced apart from each other,by AC voltage means having a frequency which differs significantly from a resonant frequency of said strips for energizing said strips to execute oscillations so that said free ends are periodically displaced in counterphase out of said plane and by respective resilient mounting means extending between said free ends and said mirror for mounting said mirror on strips.
Claim 11
Dependent Claim
120 words
Piezoelectric light deflecting apparatus having a mirror which can be caused to execute a rotary oscillation by a piezoelectric device energized by an AC voltage, the apparatus being characterized by first and second piezoceramic strips each having a clamped end and a free end, said strips being substantially aligned in one plane with their free ends facing and spaced apart from each other,by AC voltage means having a frequency which differs significantly from a resonant frequency of said strips for energizing said strips to execute oscillations so that said free ends are periodically displaced in counterphase out of said plane and by respective resilient mounting means extending between said free ends and said mirror for mounting said mirror on strips.
Claim 12
Dependent Claim
108 words
Piezoelectric light deflecting apparatus having a mirror which can be caused to execute a rotary oscillation by a piezoelectric device energized by an AC voltage the apparatus being characterized by an elongate piezoceramic strip having a clamped end and a free end, by resilient means connecting said free end to said mirror,by means spaced from said free end for mounting said mirror for pivotal movement relative to fixed structure and by AC voltage means having a frequency which differs significantly from the resonant frequency of the piezoceramic strip for energizing said piezoceramic strip to produce oscillating movement of said free end; and thereby rotary oscillations of said mirror.
Claim 13
Dependent Claim
108 words
Piezoelectric light deflecting apparatus having a mirror which can be caused to execute a rotary oscillation by a piezoelectric device energized by an AC voltage the apparatus being characterized by an elongate piezoceramic strip having a clamped end and a free end, by resilient means connecting said free end to said mirror,by means spaced from said free end for mounting said mirror for pivotal movement relative to fixed structure and by AC voltage means having a frequency which differs significantly from the resonant frequency of the piezoceramic strip for energizing said piezoceramic strip to produce oscillating movement of said free end; and thereby rotary oscillations of said mirror.
References Cited (Backward Citations)
No citation records indexed.
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