Optical disk recording and readout system having read, write and

Details Optical disk recording and readout system having read, write and Optical disk recording and readout system having read, write and

1984-07-06

1988-03-29

Psitos, Aristotelis M.

Electric power conversion systems

Current conversion

Using electronic tube converter

369122, 350286, G11B 700, G02B 504

Patent

active

047349069

ABSTRACT:
A self contained, replaceable diode laser module for providing a fully collimated, de-astigmatized, and circular cross-sectioned beam. In the preferred embodiment a first compound spherical lens partially collimates the beam. An in-line combined cross-section modifier system then de-astigmatizes and modifies the cross-section of the beam. The beam modifier system is comprised of first and second triangular prisms oriented at non-normal angles to the path of the beam. This allows both the cross-section and the astigmatism of the beam to be corrected. A planar mirror between the first and second prisms directs the beam from the first prism to the second prism, so that the beam can exit the second prism co-axial with the incident beam path. The beam then enters the second collimating subsystem. This subsystem is a telescopic lens system comprised of a second and a third spherical, which simultaneously, completely collimates the beam, and expands the beam to the proper diameter for transmission through the optical system of the main device. The beam, upon existing the second collimating subsystem is a fully collimated beam, which is de-astigmatized and has a circular cross-section of the proper diameter.

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