Recording apparatus for magneto-optical disc

Claim 2

A recording apparatus according to claim 1, wherein said external magnetic field generator is supported by a rotatable arm so that said generator is moveable toward and away from a magneto-optical disc and is moveable together with said arm in a radial direction of said magneto-optical disc.

Claim 3

A recording apparatus according to claim 1 or 2, wherein said external magnetic field generator is moveable in an outer radial direction of said magneto-optical disc when magneto-optical disc is unloaded.

Claim 4

A recording apparatus according to claim 2 or 3, wherein said outer magnetic field generator is mounted on a projection provided on one side of a rotatable arm facing the magneto-optical disc.

Claim 5

A recording apparatus according to any one of claims 1 to 4, wherein said recording apparatus further comprises misinsertion detection means, said misinsertion detection means including a misinsertion detection portion which is urged to move in an outer direction of the cartridge holding portion of said cartridge holder by the disc cartridge when the disc cartridge is inserted into said cartridge holder and is engaged with said disc cartridge when said disc cartridge is misinserted for preventing said disc cartridge from being inserted into said cartridge holder, characterised in that said misinsertion detection portion of said misinsertion detection means has a width larger than an opening width of a recess on one side of the disc cartridge on which a notch is formed.

Claim 6

A disc cartridge misinsertion preventing mechanism which comprises; a cartridge holder into which the disc cartridge having a notch for determining an insertion direction formed at a corner on one side thereof is insertable and holdable therein; and misinsertion detection means having a misinsertion detection portion which is urged by the disc cartridge to move in an outer direction of a cartridge holding portion of a cartridge holder when said disc cartridge is inserted into said cartridge holder and which is engaged with the disc cartridge for preventing said disc cartridge from being inserted into said cartridge holder when said disc cartridge is misinserted, and in that said misinsertion detection portion of said misinsertion detection means has a width larger than an opening width of a recess provided on one side of the disc cartridge on which a notch is formed.

Claim 7

A disc cartridge misinsertion preventing mechanism according to claim 6, wherein said cartridge holder is rotatably provided with shutter opening and closing means having an opening and closing means for opening and closing a shutter of the disc cartridge inserted into said holder and is provided with a spring member having one end thereof mounted on said shutter opening and closing means and the other end thereof mounted on said misinsertion detection means.

Claim 8

A disc cartridge misinsertion preventing mechanism according to claim 7, wherein said misinsertion detection means is provided in said cartridge holder so that said misinsertion detection portion projects into said cartridge holder.

Claim 9

A recording apparatus for a magneto-optical disc which comprises: a loading mechanism for performing loading and unloading of a magneto-optical disc inserted into a recording portion; an external magnetic field generator for recording information signals on a magneto-optical disc loaded on said recording portion together with an optical head of said recording portion; lifting means for lowering and raising said external magnetic field generator toward and away form the magneto-optical disc loaded on the recording portion, and control means which is operative to lower said external magnetic field generator toward the magneto-optical disc by said lifting means after commencement of the recording of the magneto-optical disc and raises said external magnetic field generator away from the magneto-optical disc by said lifting means prior to completion of the recording of the magneto-optical disc.

Claim 10

An apparatus for a magneto-optical disc, according to claim 9, wherein said control means is operative to control said external magnetic field generator to lower it toward the magneto-optical disc on commencement of the rotation of said magneto-optical disc loaded on said recording portion and to raise the generator away from the prior to completion of the rotation of said magneto-optical disc away from the magneto-optical disc.

Claim 11

A magneto-optical disc recording apparatus according to claim 9 or 10, wherein said external magnetic field generator is controlled by said control means to move in a diametral direction of the magneto-optical disc in which the magneto-optical disc is unloaded by said loading mechanism.

Claim 12

A magneto-optical disc recording apparatus according to claim 11, wherein said external magnetic field generator is provided integrally with the optical head device of said recording portion.

Claim 13

A magneto-optical disc recording apparatus according to claim 12, wherein said external magnetic field generator comprises an arm-like member, and a magnetic head device provided on a projection on the side of the arm like member facing the magneto-optical disc.