EP0463295A2
Expired / Lapsed
EP
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Optical pickup head
Assignee: Panasonic Holdings Corp
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Filing: 1991-03-20
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Granted: —
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Expires: 2011-03-20
Abstract
Abstract In an optical pickup head, a light source emits a light beam. A first reflecting section reflects the light beam emitted from the light source and changes a direction of a travel of the light beam emitted from the light source. A second reflecting section reflects the light beam and changes a direction of a travel of the light beam after the light beam is reflected by the first reflecting section. The light beam reflected by the second reflecting section is focused on the optical recording medium. The light beam is reflected and diffracted by the optical recording medium. The light beam reflected and diffracted by the optical recording medium is detected. A common support member is formed with both the first and second reflecting sections.
Inventors
- 👤 Shinichi Kadowaki
- 👤 Yoshiaki Komma
- 👤 Seiji Nishino
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 18:11
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/12; G11B7/13; G11B7/131; G11B7/123; G11B7/135; G11B7/1353
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
153 words
An optical pickup head operating on an optical recording medium, comprising: a light source emitting a light beam; a first reflecting section reflecting the light beam emitted from the light source and changing a direction of a travel of the light beam emitted from the light source; a second reflecting section reflecting the light beam and changing a direction of a travel of the light beam after the light beam is reflected by the first reflecting section; means for focusing the light beam reflected by the second reflecting section on the optical recording medium, wherein the light beam is reflected and diffracted by the optical recording medium; means for detecting the light beam reflected and diffracted by the optical recording medium; means for guiding the light beam reflected and diffracted by the optical recording medium to the detecting means; and a common support member formed with both the first and second reflecting sections.
Claim 2
Dependent Claim
168 words
An optical pickup head operating on an optical recording medium, comprising: a light source emitting a light beam; a first reflecting section reflecting the light beam emitted from the light source and changing a direction of a travel of the light beam emitted from the light source; a second reflecting section reflecting the light beam and changing a direction of a travel of the light beam after the light beam is reflected by the first reflecting section; means for focusing the light beam reflected by the second reflecting section on the optical recording medium, wherein the light beam is reflected and diffracted by the optical recording medium; a holographic optical element diffracting the light beam reflected and diffracted by the optical recording medium, and generating a diffraction light beam from the light beam reflected and diffracted by the optical recording medium; means for detecting the diffraction light beam generated by the holographic optical element; and a common support member formed with both the first and second reflecting sections.
Claim 3
Dependent Claim
23 words
The optical pickup head of claim 2 wherein the second reflecting section and the holographic optical element are composed of a single member.
Claim 4
Dependent Claim
131 words
An optical pickup head operating on an optical recording medium, comprising: a light source emitting a light beam; a common member having first and second reflecting surfaces, the first reflecting surface reflecting the light beam emitted from the light source and changing a direction of a travel of the light beam emitted from the light source, the second reflecting surface reflecting the light beam and changing a direction of a travel of the light beam after the light beam is reflected by the first reflecting surface; means for focusing the light beam reflected by the second reflecting surface on the optical recording medium, wherein the light beam is reflected and diffracted by the optical recording medium; and means for detecting the light beam reflected and diffracted by the optical recording medium.
Claim 5
Dependent Claim
19 words
The optical pickup head of claim 4 wherein the first and second reflecting surfaces are perpendicular to each other.
References Cited (Backward Citations)
No citation records indexed.
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