# US 5,347,416 A · Disc cartridge having improved shutter

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- Number: US 5,347,416 A
- Document ID: US5347416A
- Status: Granted
- Kind: A
- Application number: 08/032,266
- Filed: 1993-03-17
- Granted: 1994-09-13
- Earliest claimed: 1987-10-15
- Assignees: TDK Corporation
- Inventors: Masaru Ikebe; Haruo Shiba
- Web page: https://patentgrep.com/patent/US5347416A

## CPC

- G11B 23/0308: {Shutters (G11B23/0317 takes precedence)}
- G11B: INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER (recording measured values in a way that does not require playback through a transducer G01D9/00; recording or playback apparatus using mechanically marked tape, e.g. punched paper tape, or using unit records, e.g. punched or magnetically marked cards G06K; transferring data from one type of record carrier to another G06K1/18; circuits for coupling output of reproducer to radio receiver H04B1/20; gramophone pick-ups or like acoustic electromechanical transducers or circuits therefor H04R)

## Abstract

A disc facilitates manufacturing of a shutter plate with manufacturing high yields and also facilitates pressing of the shutter plate, as well as ensuring smooth loading and unloading of the disc cartridge in a cartridge operating unit. In the disc cartridge, a slider is provided with projections and holes for engagement and each of the shutter plates is provided with an L-shaped connected portion formed with holes and projections respectively engageable with the projections and holes of the slider, and connection of the slider to the shutter plates for assembling a shutter is accomplished through engagement between the projections and holes of the slider and shutter plates while abutting inner and end surfaces of the slider against horizontal and vertical portions of the stepped connected section of each of the shutter plates.

## Claims

### Claim 1

A disc cartridge comprising:
a casing comprising an upper casing member and a lower casing member joined together to define an interior space in said casing, said casing having at least one pickup inserting hole therein;
a disc mounted in said casing so as to be rotatable therein; and
a shutter having a substantially U-shape and comprising upper and lower shutter plates and a slider for connecting said upper and lower shutter plates to each other, said slider being slidably fitted on said casing for covering and uncovering said pickup inserting hole;
said slider including a first side wall arranged on the side of said slider to which the slider moves to uncover said pickup inserting hole, said first side wall having an opening;
a shaft engagedly fitted in said opening, said slider being guided on said shaft, and also including biasing means urging said shutter in the direction of covering said pickup inserting hole;
said casing having an inner surface defining said interior space, said inner surface including guiding means;
said slider also including a second side wall on the opposite wall of said slider with respect to said pick-up inserting hole and having guided means comprising a projection which slidably engages with said guiding means of said casing.