Lens fixing device and optical pickup device
AssigneeSanyo Electric Co., Ltd.
InventorsYasuyuki Kano, Kenji Asano, Shigeki Hori
Life of this patent
Estimating the term…
Abstract
A lens fixing device includes a lens holder having a lens (lens area) made of a resin, and a mounting portion. The lens holder has two projections. Each of the two projections is formed with a guide surface and a mounted surface. A line of intersection of an extension of the guide surface of the projections and an extension of the mounted surface of the projections in a plane direction is aligned with an optical axis of the lens area. The lens holder is positioned with respect to a plane direction orthogonal to the optical axis by contact of the guide surfaces with receiving surfaces of the mounting portion. The lens holder is fixedly attached by an adhesive.
Claims10
A lens fixing device comprising:
- a lens portion including a lens made of a resin;
- and
- amounting portion on which the lens portion is mounted, wherein:
- the lens portion includes two projections projecting in directions away from a center axis of the lens,
- each of the two projections has a guide surface opposing to the mounting portion, and a mounted surface disposed away from the mounting portion with respect to the guide surface,
- the guide surfaces and the mounted surfaces are disposed at such positions that a line of intersection of an extension of the respective guide surfaces and an extension of the respective mounted surfaces is aligned with the center axis of the lens, and
- an angle defined by the guide surfaces of the two projections around the center axis is set smaller than 180 degrees, and
- wherein:
- the mounting portion includes two receiving surfaces to be brought into surface contact with the guide surfaces of the two respective projections in mounting the lens portion on the mounting portion, and a fixing surface adapted to be positioned adjacent to the mounted surfaces in a state that the two guide surfaces are brought into surface contact with the two respective receiving surfaces, and
- the mounted surfaces and the fixing surface are fixed to each other by an adhesive in a direction perpendicular to the mounted surfaces and the fixing surface in a state that the two guide surfaces are brought into surface contact with the two respective receiving surfaces.
An optical pickup device comprising:
- a lens fixing device,
- the lens fixing device including
- a lens portion having a lens made of a resin, and
- a mounting portion on which the lens portion is mounted,
- wherein:
- the lens portion has two projections projecting in directions away from a center axis of the lens,
- each of the two projections has a guide surface opposing to the mounting portion, and a mounted surface disposed away from the mounting portion with respect to the guide surface,
- the guide surfaces and the mounted surfaces are disposed at such positions that a line of intersection of an extension of the respective guide surfaces and an extension of the respective mounted surfaces is aligned with the center axis of the lens, and
- an angle defined by the guide surfaces of the two projections around the center axis is set smaller than 180 degrees, and
- wherein:
- the mounting portion includes two receiving surfaces to be brought into surface contact with the guide surfaces of the two respective projections in mounting the lens portion on the mounting portion, and a fixing surface adapted to be positioned adjacent to the mounted surfaces in a state that the two guide surfaces are brought into surface contact with the two respective receiving surfaces, and
- the mounted surfaces and the fixing surface are fixed to each other by an adhesive in a direction perpendicular to the mounted surfaces and the fixing surface in a state that the two guide surfaces are brought into surface contact with the two respective receiving surfaces.
Dependencies are inferred from the claim text.