Checking device for flatness of a drive chassis of a disc player

Details Checking device for flatness of a drive chassis of a disc player Checking device for flatness of a drive chassis of a disc player

1996-12-02

1998-05-26

Nelms, David C.

Optics: measuring and testing

By polarized light examination

With light attenuation

G01B 1130

Patent

active

057574952

ABSTRACT:
A supporting part for supporting a drive chassis has a bottom surface, side walls formed to be bent upwardly from the bottom surface, and combining projectors projected on the top surface of the side walls which are inserted into combining holes of the drive chassis. A guide rod is installed parallel with and on the driving chassis. A master pickup has a detecting lens reflecting an incident light. A transporting part has a first light sensing portion installed at a top thereof and a rack gear portion formed on a bottom surface of the supporting part. The transporting part is movable parallel with the supporting part by the rack gear portion. The master pickup can be moved parallel with a surface of the drive chassis wherein the master pickup is guided by a guide rod is conjunction with the movement of the transporting part. The first light sensing portion is displaced directly vertical above the master pickup and arranged to focus coinciding with the detecting lens so that a beam which is downwardly projected from the first light sensing portion is reflected and returned by the detecting lens. The first light sensing portion senses a returned beam and determines whether the drive chassis is flat.

REFERENCES:
patent: 3749496 (1973-07-01), Hietanen et al.
patent: 4412743 (1983-11-01), Eberly

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