EP0467303A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
An optical disk head and a method for producing the same
Assignee: Panasonic Holdings Corp
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Filing: 1991-07-16
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Granted: —
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Expires: 2011-07-16
Abstract
Abstract An optical disk head which includes a substrate, a light path for allowing light beam to propagate in a zigzag form, having a thickness and width of 10 times greater than the wavelength, a light source optically connected to the light path so as to allow an incident light from the light source to propagate therethrough, a first light condensing means optically connected to the light path so as to radiate the light beam propagated through the light path upon an object provided toward a top surface of the substrate, a second light condensing means for guiding the light beam reflected from the object into the light path, and an optical detector for detecting the light beam propagated through the light path guided by the second light condensing means.
Inventors
- 👤 Teruhiro Shiono
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 02:01
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/12; G11B7/135; G11B7/1353; G02; G02B; G02B5/00; G02B5/18; G02B5/1876; G02B5/188; G02B5/1885; G02B6/00; G02B6/10; G02B6/12; G02B6/122; G02B6/124; G02B6/1245; G02B6/24; G02B6/26; G02B6/34; G02B6/42; G02B6/43; G11B7/123; G11B7/124
Claims Analysis
Total Claims: 50
Claim 1
Independent Claim
134 words
An optical disk head comprising a substrate, a light path for allowing light beam to propagate in a zigzag form, having a thickness and width of at least 10 times greater than the wavelength, a light source optically connected to the light path so as to allow an incident light from the light source to propagate therethrough, a first light condensing means optically connected to the light path so as to radiate the light beam propagated through the light path upon an optical recording medium provided over a top surface of the substrate, a second light condensing means for guiding the light beam reflected from the optical recording medium into the light path, and an optical detector for detecting the light beam propagated through the light path guided by the second light condensing means.
Claim 2
Dependent Claim
134 words
An optical disk head comprising a substrate, a light path for allowing light beam to propagate in a zigzag form, having a thickness and width of at least 10 times greater than the wavelength, a light source optically connected to the light path so as to allow an incident light from the light source to propagate therethrough, a first light condensing means optically connected to the light path so as to radiate the light beam propagated through the light path upon an optical recording medium provided over a top surface of the substrate, a second light condensing means for guiding the light beam reflected from the optical recording medium into the light path, and an optical detector for detecting the light beam propagated through the light path guided by the second light condensing means.
Claim 3
Dependent Claim
34 words
An optical disk head according to claim 1, wherein the thickness and width of the light path is not smaller than 100 times the wavelength of the light beam propagated through the light path.
Claim 4
Dependent Claim
15 words
An optical disk head according to claim 1, further comprising a position detecting optical means.
Claim 5
Dependent Claim
17 words
An optical disk head according to claim 1, wherein the light path is disposed within the substrate.
Claim 6
Dependent Claim
59 words
An optical disk head according to claim 1, wherein the first light condensing means is a diffractive optical component having a curved grating which comprises a plurality of curves which are bulged in the direction in which the light beam from the light source are propagated and symmetrical with respect to the center line of the propagating light beam.
Claim 7
Dependent Claim
69 words
An optical disk head according to claim 1, wherein the second light condensing means is a diffractive optical component having a grating which comprises a plurality of curves which are bulged in the opposite direction to the direction in which the light beam introduced into the light path by the second light condensing means are propagated and symmetrical with respect to the center line of the propagating light beam.
Claim 8
Dependent Claim
19 words
An optical disk head according to claim 3, wherein the position detecting optical means is an optical beam splitter.
Claim 9
Dependent Claim
103 words
An optical disk head according to claim 7, wherein the optical beam splitter is a reflex diffractive optical component disposed on the top surface of the substrate so as to face the optical recording medium, and has a pair of lenses, the pattern of each grating comprising a group of ellipses having equal eccentric ratios and major axes in the direction in which the light beam is propagated, wherein the centers of the ellipses are shifted one after another progressively in the opposite direction to the direction in which the light beam is propagated and the grating period diminishing toward the outside peripheries.
Claim 10
Dependent Claim
28 words
An optical disk head according to claim 7, wherein the optical beam splitter comprises a pair of reflex micro-Fresnel lenses disposed on the top surface of the substrate.
Claim 11
Dependent Claim
29 words
An optical disk head according to claim 1, wherein the light path comprises a collimator for collimating the light beam propagated through the light path from the light source.
Claim 12
Dependent Claim
17 words
An optical disk head according to claim 10, wherein the collimator is a reflex diffractive optical component.
Claim 13
Dependent Claim
54 words
An optical disk head according to claim 11, wherein the collimator comprises gratings which include a plurality of ellipses having major axes in the direction in which the light beam is propagated, wherein the centers of the curves are shifted one after another progressively in the direction in which the light beam is propagated.
Claim 14
Dependent Claim
15 words
An optical disk head according to claim 10, wherein the collimator is a micro-Fresnel lens.
Claim 15
Dependent Claim
53 words
An optical disk head according to claim 11, wherein the first and second light condensing means are transmission off-axis lenses disposed on the top surface of the substrate so as to face the optical recording medium, and wherein the beam splitter and the collimator are disposed on the top surface of the substrate.
Claim 16
Dependent Claim
33 words
An optical disk head according to claim 1, wherein the light source and the optical detector are disposed on the top surface of the substrate so as to face the optical recording medium.
Claim 17
Dependent Claim
25 words
An optical disk head according to claim 14, wherein the light source and the optical detector are disposed on the bottom surface of the substrate.
Claim 18
Dependent Claim
49 words
An optical disk head according to claim 16, wherein the light source and the collimator are disposed in correspondence to each other with the substrate being interposed, and wherein the optical detector and the optical beam splitter are disposed in correspondence to each other with the substrate being interposed.
Claim 19
Dependent Claim
29 words
An optical disk head according to claim 1, wherein the first and second light condensing means are reflex off-axis lenses, and disposed on the bottom surface of the substrate.
Claim 20
Dependent Claim
40 words
An optical disk head according to claim 1, wherein the second light condensing means is a transmission diffractive beam splitter, and disposed on the top surface of the substrate, and the split light beam is detected by the optical detector.
Claim 21
Dependent Claim
67 words
An optical disk head according to claim 19, wherein the second light condensing means comprises a pair of gratings which includes a plurality of curves bulged in the opposite direction to the direction in which the light beam introduced by the second light condensing means into the light path are propagated therethrough, the curves being symmetrical with respect to the center line of the propagating light beam.
Claim 22
Dependent Claim
25 words
An optical disk head according to claim 20, wherein the light source and the optical detector are disposed on the top surface of the substrate.
Claim 23
Dependent Claim
128 words
An optical disk head comprising a substrate, a light path for allowing light beam to propagate in a zigzag form, having a thickness and width of at least 10 times greater than the wavelength, a light source optically connected to the light path so as to allow an incident light from the light source to propagate therethrough, a light condensing means optically connected to the light path so as to radiate the light beam propagated through the light path upon an optical recording medium provided over a top surface of the substrate and for guiding the light beam reflected from the optical recording medium into the light path, and an optical detector for detecting the light beam propagated through the light path guided by the light condensing means.
Claim 24
Dependent Claim
128 words
An optical disk head comprising a substrate, a light path for allowing light beam to propagate in a zigzag form, having a thickness and width of at least 10 times greater than the wavelength, a light source optically connected to the light path so as to allow an incident light from the light source to propagate therethrough, a light condensing means optically connected to the light path so as to radiate the light beam propagated through the light path upon an optical recording medium provided over a top surface of the substrate and for guiding the light beam reflected from the optical recording medium into the light path, and an optical detector for detecting the light beam propagated through the light path guided by the light condensing means.
Claim 25
Dependent Claim
35 words
An optical disk head according to claim 22, wherein the thickness and width of the light path are at least 100 times greater than the wavelength of the light beam propagated through the light path.
Claim 26
Dependent Claim
15 words
An optical disk head according to claim 22, further comprising a position detecting optical means.
Claim 27
Dependent Claim
17 words
An optical disk head according to claim 22, wherein the light path is disposed within the substrate.
Claim 28
Dependent Claim
61 words
An optical disk head according to claim 22, wherein the light condensing means is a diffractive optical component having a grating which comprises a plurality of curves which are bulged in the opposite direction to the direction in which the light beam from the light source are propagated and symmetrical with respect to the center line of the propagating light beam.
Claim 29
Dependent Claim
19 words
An optical disk head according to claim 24, wherein the position detecting optical means is an optical beam splitter.
Claim 30
Dependent Claim
50 words
An optical disk head according to claim 27, wherein the optical beam splitter is a reflex diffractive optical component for diffracting the light beam introduced by the light condensing means into the light path and propagated therethrough so as to direct the light beam sideways of the direction of propagation.
Claim 31
Dependent Claim
26 words
An optical disk head according to claim 22, wherein the light condensing means is a reflective type, and disposed on the bottom surface of the substrate.
Claim 32
Dependent Claim
29 words
An optical disk head according to claim 29, wherein the optical beam splitter, the light source, and the optical detector are disposed on the bottom surface of the substrate.
Claim 33
Dependent Claim
38 words
An optical disk head according to claim 27, wherein the beam splitter comprises a pair of curved gratings which are arranged perpendicularly to the direction in which the light beam is propagated, and are symmetrical to each other.
Claim 34
Dependent Claim
39 words
An optical disk head according to claim 31, further comprising a reflex collimator disposed on the bottom surface of the substrate, so as to collimate the light beam radiated from the light source and propagated through the light path.
Claim 35
Dependent Claim
67 words
An optical disk head according to claim 32, wherein the collimator is a reflex diffractive optical component and comprises curved grating which includes a plurality of ellipses having major axes in the direction in which the light beam is propagated, wherein the centers of the elliptical curves are shifted one after another progressively in the direction in which the light beam from the light source are propagated.
Claim 36
Dependent Claim
22 words
An optical disk head according to claim 27, wherein the beam splitter comprises a linear grating including a plurality of linear lines.
Claim 37
Dependent Claim
38 words
An optical disk head according to claim 28, wherein the light condensing means is a transmission type, and is disposed on the top surface of the substrate so as to radiate the light beam perpendicularly to the substrate.
Claim 38
Dependent Claim
36 words
An optical disk head according to claim 35, wherein the beam splitter is disposed on the top surface of the substrate, and the optical detector and the light source are disposed on the bottom surface thereof.
Claim 39
Dependent Claim
49 words
An optical disk head according to claim 36, wherein the beam splitter comprises a pair of curved gratings arranged on opposite sides of the direction in which the light beam is propagated through the light path, and are symmetrical to each other with respect to the light propagating direction.
Claim 40
Dependent Claim
33 words
An optical disk head according to claim 37, wherein the substrate is provided with a reflex collimator for collimating the light beam output from the light source and propagated through the light path.
Claim 41
Dependent Claim
63 words
An optical disk head according to claim 38, wherein the collimator is a diffractive optical component, and includes a plurality of elliptical curves having major axes in the direction in which the light beam is propagated, wherein the centers of the elliptical curves are shifted one after another progressively in the direction in which the light beam from the light source is propagated.
Claim 42
Dependent Claim
22 words
An optical disk head according to claim 36, wherein the beam splitter comprises a linear grating including a plurality of linear lines.
Claim 43
Dependent Claim
32 words
An optical disk head according to claim 40, wherein the substrate is provided with a reflex collimator for collimating the light beam from the light source and propagated through the light path.
Claim 44
Dependent Claim
67 words
An optical disk head according to claim 41, wherein the collimator is a diffractive type, and comprises a curved grating which includes a plurality of elliptical curves having major axes in the direction in which the light beam is propagated, wherein the centers of the elliptical curves are shifted one after another progressively in the direction in which the light beam from the light source is propagated.
Claim 45
Dependent Claim
41 words
An optical disk head according to claim 28, wherein the light condensing means is a transmission type, and disposed on the top surface of the substrate so as to radiate the light beam from the light source obliquely to the substrate.
Claim 46
Dependent Claim
49 words
An optical disk head according to claim 43, wherein the beam splitter comprises a pair of curved gratings arranged on opposite sides of the direction in which the light beam is propagated through the light path, and are symmetrical to each other with respect to the light propagating direction.
Claim 47
Dependent Claim
28 words
An optical disk head according to claim 44, wherein the beam splitter, the optical detector, and the light source are disposed on the top surface of the substrate.
Claim 48
Dependent Claim
38 words
An optical disk head according to claim 44, wherein the beam splitter is disposed on the top surface of the substrate, and the optical detector and the light source are disposed on the bottom surface of the substrate.
Claim 49
Independent Claim
55 words
A method for fabricating an optical disk head, the method comprising the steps of preparing a substrate including a light path, preparing a single mold for molding diffractive optical components used as a light condensing means and a position detecting optical means, and mounting the two diffractive optical components at one time on the substrate.
Claim 50
Independent Claim
55 words
A method for fabricating an optical disk head, the method comprising the steps of preparing a substrate including a light path, preparing a single mold for molding diffractive optical components used as a light condensing means and a position detecting optical means, and mounting the two diffractive optical components at one time on the substrate.
References Cited (Backward Citations)
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