Glass optical element and manufacturing method thereof
a technology of optical elements and manufacturing methods, applied in the field of glass optical elements, can solve the problems of deteriorating recording and reproduction accuracy, inability to secure sufficient laser power for accurate recording and reproducing, and output of blue lasers, and achieve the effect of high eccentric accuracy
Inactive Publication Date: 2006-11-09
KONICA MINOLTA OPTO
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Benefits of technology
[0010] It is a main object of the present invention to provide an apparatus that manufactures a glass optical element having high eccentric accuracy.
[0011] It is another object of the present invention to provide a beam shaping element with high eccentric accuracy.
Problems solved by technology
When the divergent beam is focused by an objective lens directly, the beam is emitted only to a part of a circular recording region or also to the outside of the recording region, thereby deteriorating accuracy of recording and reproduction.
Output of the blue lasers is, however, weak at present, a sufficient laser power for accurate recording and reproducing cannot be secured.
Further, in such beam shaping elements, alignment work with high accuracy is necessary at the time of incorporating a pickup, and thus the adjusting method becomes very difficult (parallel eccentricity: about 1 to 10 μm, tilt eccentricity: 1 to 5 min.)
Method used
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[0061] The beam shaping element which converts emitted light from LD with ellipticity of 2.2 was designed. A shape of the element was the same as that in FIG. 3, one surface had a non-arc convex shape with approximate radius of about 3.3 mm, and the other surface had a non-arc concave shape with approximate radius of 1.3 mm. The LD was arranged on the concave surface side of the beam shaping element, and more specifically, the distance between the generatrix of the convex surface and an emitting aperture of the LD was about 1.5 mm. As to an external shape of the element, H′−H″ was 4 mm, H′−G′ was 4 mm, and the distance between the generatrices was 3.8 mm.
[0062] As to the tolerance of each eccentricity, the parallel eccentricity of each surface (directrix direction) was 8 μm, the tilt eccentricity of each surface (about the generatrix direction) was 10 min., the block parallel eccentricity (directrix direction) was 10 μm, and the block tilt eccentricity (generatrix direction) was 5 ...
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Abstract
A manufacturing apparatus of the present invention has a pair of dies that form each cylindrical surface, and a plane member that forms side surfaces of an element. The upper die and the lower die has a cylindrical surface which is worked so as to have generatrix which connects intersection points between a non-arc axis and a cylindrical section and between an arc center axis and the cylindrical section. The plane member is pressed against reference surfaces of the upper die and the lower die. In this state, a glass material is put between the upper die and the lower die, and a distance between the upper die and the lower die is decreased. As a result, the cylindrical surfaces of the upper die and the lower die and the plane of the plane member are transferred onto the glass material.
Description
[0001] The present application claims priority to Japanese Patent Application No. 2005-116805 filed in Apr. 14, 2005, the entire content of which is hereby incorporated by reference. BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The present invention relates to a glass optical element. Particularly, the invention relates to a beam shaping element that converts oval output light from a blue laser diode or the like into circular light. [0004] 2. Description of the Related Art [0005] In general, a light source which is used in a pickup optical system is a laser diode (LD), its output light is an oval divergent beam. When the divergent beam is focused by an objective lens directly, the beam is emitted only to a part of a circular recording region or also to the outside of the recording region, thereby deteriorating accuracy of recording and reproduction. A sectional shape of the beam should be, therefore, shaped so that the section has a circular shape on a recordi...
Claims
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Patent Timeline
Login to View More IPC IPC(8): G02B25/00C03B11/00G02B3/00G02B13/00G02B15/00
CPCC03B11/08C03B2215/03G02B27/095C03B2215/72G02B3/02C03B2215/49
Inventor OGURA, KAZUYUKIKAMADA, YOSHIHIROTAKATORI, KOJIROTADA, KAZUNARI
Owner KONICA MINOLTA OPTO