The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 25, 1985
Filed:
Jun. 16, 1982
Koichiro Nakagawa, Takarazuka, JP;
Satoshi Suyama, Neyagawa, JP;
Masahiro Yanagi, Settsu, JP;
Yasutaka Nakajima, Nara, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A cartridge to be inserted into a drive unit includes a casing containing a recording medium disc to be driven by the drive unit. The disc has a hub fixed at its center. Center windows are provided at opposite sides of the casing and allow the hub to be inserted therethrough. Head windows are provided also at opposite sides of the casing and allow a reading head to access information recorded on opposite sides of the disc. Shutters are provided around the center windows and normally cover the head windows. These shutters are rotatable about the center windows and uncover the head windows when the cartridge is inserted into the drive unit. An actuator for rotating the shutters is provided between the shutters and the outside of the casing. The actuator has a portion exposed to the outside of the casing so that the shutters are automatically and indirectly rotated by an external force applied to the actuator when the cartridge is inserted into the drive unit. An advantage of the arrangement of these elements is that damage to and malfunctioning of the cartridge is prevented.