Patent EP0180767A2 successfully refreshed from Google Patents.
EP0180767A2
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EP
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Optical lens device
Assignee: Hitachi Ltd
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Filing: 1985-10-02
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Granted: —
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Expires: 2005-10-02
Abstract
Abstract In the present invention, a micro Fresnel lens (52) in the shape of a thin film is used. A lens driving member constructed of piezoelectric transducers (54, 56) or of magnets and coils is disposed around the lens (52). The focus of the lens (52) is adjusted by controlling applied voltage to the piezoelectric transducers (54, 56) or the coils.
Inventors
- 👤 Satoshi Shimade
- 👤 Hiroshi Sasaki
- 👤 Nobuyoshi Tsuboi
- 👤 Hideki Nihei
- 👤 Norifumi Miyamoto
- 👤 Tetsuo Ito
- 👤 Yoshio Sato
- 👤 Atsumi Watanabe
- 👤 Ryo Hiraga
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-27 14:33
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/12; G11B7/135; G11B7/1353; G11B7/08; G11B7/09; G11B7/0925; G11B7/0937; G11B7/1372; G11B7/0908; G11B7/0909
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
45 words
An optical lens device comprising a lens in the shape of a thin film (52) which is fixed at end parts thereof, and a drive member (54,56) for moving said lens (52), which is disposed in a peripheral part (53,55) of said lens. (Fig. 13)
Claim 2
Dependent Claim
45 words
An optical lens device comprising a lens in the shape of a thin film (52) which is fixed at end parts thereof, and a drive member (54,56) for moving said lens (52), which is disposed in a peripheral part (53,55) of said lens. (Fig. 13)
Claim 3
Dependent Claim
15 words
The device of claim 1, wherein said lens (52) is made of an elastic material.
Claim 4
Dependent Claim
31 words
The device of claim 1 or 2, wherein the peripheral part (53, 55) of said lens (52) on which said drive member (54,56) is mounted is made of an elastic material.
Claim 5
Independent Claim
43 words
The device of any of claims 1 to 3,wherein said drive member comprises piezoelectric transducers (54,56), and means is comprised to adjust voltages to be applied to said piezoelectric transducers (54,56), thereby to control a focal position of said lens (52). (Fig. 13)
Claim 6
Independent Claim
79 words
The device of any of claims 1 to 3, wherein said drive member comprises magnets (541, 542, 561, 562) which are disposed in the peripheral part (53, 55) of said lens (52), annular coils (59) which are disposed near side surfaces of said lens (52) and in opposition to said magnets (541, 542, 561, 562), and means to adjust voltages to be applied to said coils (59), thereby to control a focal position of said lens (52). (Fig. 16)
Claim 7
Independent Claim
167 words
The device of any of claims 1 to 5, wherein said lens comprises a first thin-film lens (52) which projects a light beam on a recording medium (9) located in opposition to said lens (52) and adapted to rotate and which reproduces recorded information of the recording medium (9) on the basis of resulting reflected light, and a second thin-film lens which consists of a pair of lenses (59, 59') arranged in a direction orthogonal to a rotating direction of the recording medium (9) and which receives input light from one side and reflected light from the other side thereof so as to perform detection for tracking of the recording medium (9), and wherein said drive member consists of a pair of elements (54, 54') which are disposed in outer parts in the same direction as that of said second thin-film lens (59,59') and applied voltages of which are adjusted on the basis of the reflected light obtained through said second thin-film lens (59, 59'). (Fig. 18)
Claim 8
Independent Claim
164 words
The device of any of claims 1 to 6, wherein said lens comprises a first thin-film lens (52) which projects a light beam on a recording medium (9) located in opposition to said lens (52) and adapted to rotate and which reproduces recorded information of the recording medium (9) on the basis of resulting reflected light, and a third thin-film lens which consists of a pair of lenses (58, 58') arranged in a rotating direction of the recording medium (9) and which receives input light from one side and reflected light from the other side thereof so as to perform detection for jittering of the recording medium (9), and wherein said drive member consists of a pair of elements (56, 56') which are disposed in outer parts in the same direction as that of a second thin-film lens (59, 59') and applied voltages of which are adjusted on the basis of the reflected light obtained through said third thin-film lens (58, 58'). (Fig. 18)
Claim 9
Independent Claim
100 words
The device of any of claims 1 to 7, wherein said lens (52) projects a light beam on a recording medium (9) located in opposition to said lens (52) and adapted to rotate and reproduces recorded information of the recording medium (9) on the basis of resulting reflected light, and wherein said drive member consists of a pair of elements (56, 56') which are arranged in a rotating direction of the recording medium (9) through the thin-film lens (52) and to which signals of high frequency are applied to form an elliptic beam in erasing the recorded information. (Fig. 19)
Claim 10
Independent Claim
130 words
The device of any of claims 1 to 8, further comprising a light source (1), a polarizing beam splitter (3) which has a first face opposite to said light source (1), a second face opposite to the first face, and a side face which transmits output light of said light source (1) from the first face to the second face and which refracts reflected light of the output light to deliver the refracted light, and a photodetector (7) which is disposed in opposition to the side face of said polarizing beam splitter (3), said optical lens device (5) being disposed in opposition to the second face so as to deliver the transmitted light from the second face to a recording medium (9) through said optical lens device (5). (Fig. 4)
Claim 11
Independent Claim
73 words
The device of any of claims 4 and 6 to 9, wherein said piezoelectric transducers (54, 56) are disposed at opposite positions with said lens (52) intervening therebetween, in the peripheral part (53, 55) of said lens (52), and the voltage adjusting means apply voltages of the same polarity and the same potential to said transducers so as to adjust the focal position in a direction perpendicular to said lens (52). (Fig. 14.2)
Claim 12
Independent Claim
182 words
The device of any of claims 4 and 6 to 10, wherein said piezoelectric transducers (54, 56) are disposed at opposite positions with said lens (52) intervening therebetween, in the peripheral part (53, 55) of said lens (52), and the voltage adjusting means apply voltages of opposite polarities and the same potential or voltages of the same polarity and unequal potentials to said transducers (53, 55) so as to adjust the focal position in a direction parallel to said lens (52).(Fig. 14.3) 12. In an optical lens device according to any of claims 4 and 6 to 11, an optical information recording apparatus comprising a recording medium (9) which is located and moved in opposition to said lens (52) and on which a light beam having passed through said lens (52) is projected, said piezoelectric transducers (54, 56) being disposed at both ends of the peripheral part (55) of said lens (52) parallel to a moving direction of said recording medium and/or at both ends of the peripheral part (53) of said lens (52) orthogonal to the moving direction. ( Fig. 13)
Claim 13
Dependent Claim
114 words
In an optical lens device according to any of claims 5 to 11, an optical information recording apparatus comprising a recording medium (9) which is located and moved in opposition to said lens (52) and on which a light beam having passed through said lens (52) is projected, said magnets (541, 542, 561, 562) being disposed at both ends of a front surface and/or a rear surface of the peripheral part (55) of said lens (52) parallel to a moving direction of said recording medium (9) and/or at both ends of a front surface and/or a rear surface of the peripheral part (53) of said lens (52) orthogonal to the moving direction. (Fig. 15)
Claim 14
Independent Claim
31 words
The device of any of claims 9 to 11, wherein the first face and/or the side face of said polarizing beam splitter (3) is a thin-film lens (2, 6). (Fig. 4)
Claim 15
Dependent Claim
68 words
An optical information recording apparatus according to any of claims 1 to 14, wherein said recording medium (9) is made of a metal or an alloy which has at least two sorts of crystalline structures in a solid state and with which the crystalline structure in one temperature region is held in the other temperature region and/or volume changes different from each other arise in a crystal state.
Claim 16
Dependent Claim
46 words
An optical information recording apparatus according to any of claims 9 to 15, wherein a thin-film lens (6) of the side face is constructed of a Fresnel zone plate (602) which is formed with recesses in a vertical direction and a lateral direction thereof. (Fig. 12)
Claim 17
Dependent Claim
96 words
An optical information recording apparatus according to any of claims 9 to 16, wherein a thin-film lens (2) of the first face is constructed of a first Fresnel zone plate (201) on which elliptic light (101) from said light source is projected and which is formed with recesses in a longitudinal direction of the elliptic light, and a second Fresnel zone plate (201) on which light focussed by said first Fresnel zone plate (201) is projected and which is formed with recesses in the same direction as in said first Fresnel zone plate (201). (Fig. 9)
Claim 18
Dependent Claim
39 words
The apparatus of claim 13, wherein said magnets (561, 562) disposed in the peripheral part (55) of said lens (52) in parallel with the moving direction of said recording medium (9) have their polarities held in agreement. (Fig. 15)
Claim 19
Dependent Claim
39 words
The apparatus of claim 13 or 18, wherein said magnets (541, 542) disposed at both the ends of the peripheral part (53) of said lens (52) orthogonally to the moving direction have their polarities held in agreement. (Fig. 15)
Claim 20
Independent Claim
70 words
The apparatus of any of claims 13 to 18 and 19, wherein said coils (59) disposed on a front surface of said lens (52) in opposition to said magnets (541, 561) are wound in series along the peripheral part of said lens (52), and said lens (52) has the focal position parallel to said lens (52) adjusted by changing values of the applied voltages to said coils (59). (Fig. 17.1)
Claim 21
Independent Claim
80 words
The apparatus of any of claims 13 and 18 to 20, wherein said coils (59) disposed on a rear surface of said lens (52) in opposition to said magnets (542, 562) are wound in parallel in the moving direction of said recording medium (9) and/or in a direction orthogonal to the moving direction, and said lens (52) has the focal position perpendicular to said lens (52) adjusted by changing values of the applied voltages to said coils (59'). (Fig. 17.2)
Claim 22
Dependent Claim
48 words
In an optical lens device according to claim 14, an optical information recording apparatus wherein said recording medium (9) is made of a metal or an alloy with which a crystalline structure at a high temperature in a solid state is held when overcooled from the high temperature.
Claim 23
Dependent Claim
113 words
In an optical lens device according to claim 14, an optical information recording apparatus wherein said recording medium (9) is made of a metal or an alloy in a crystalline state exhibiting phase transformation, which has phase of different crystalline structures in at least two temperature regions in a solid state, heating means is comprised to form concave parts or convex parts owing to the transformation between the phases, thereby to change reflection states of light from a base surface thereof and to discriminatively store signals, characters, patterns and/or symbols as information, or to erase the concave parts or convex parts into an original state, and means is comprised to reproduce the information.
Claim 24
Dependent Claim
51 words
In an optical lens device according to claim 14, an optical information recording apparatus wherein said recording medium (9) is made of a metal or an alloy whose principal ingredient is any of metal elements and transisiton metal elements of groups I.b to VII.b and group VIII in a periodic table.
References Cited (Backward Citations)
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