This article is about the skeletal structure. See also Spicule (solar physics).
Spicules are skeletal structures that appear in some types of sponges. They are made of either calcium carbonate or silica. When many are seen together, Poriferan spicules tend to look like a tightly woven mesh of stars, each having between three and six rays.
The spicule member of this invention guides the movement of the cartridge and assures proper spacial alignment between the floppy disk pair contained within the cartridge and the transducer and motor spindle mounted to the spicule member.
Spicule member 20 is called such because it serves as a backbone for two of the major components of the disk drive and it carries the disk cartridge in the region where the read/write function takes place.
This is achieved according to the practice of this invention by mounting drive spindle 45 to spicule member 20 such that the lower surface of the drive spindle is held in a fixed plane relative to the spicule member.
Large spicules, visible to the naked eye are referred to as megascleres, while smaller, microscopic ones are termed microscleres.
The composition, size, and shape of spicules is one of the largest determining factors in spongetaxonomy.
Also, the low-temperature formation of the spicules, as compared to the high temperature stretching process of commercial fiber optics, allows for the addition of impurities which improve the refractive index.
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