Amanda Bynes -- Temporary Conservatorship GRANTED

The judge in the Amanda Bynes case just granted a temporary conservatorship to her parents.

The judge based his decision in no small part on the findings of an investigator he appointed to evaluate Amanda's mental health.

As we first reported ... Amanda was not in court, because doctors at the psychiatric hospital got a 1-month extension on her psych hold ... because she's "gravely disabled" with mental illness.

Amanda's lawyer told the judge ... she's spoken with the actress several times and Amanda opposes the conservatorship, believing it's not necessary.

The conservatorship not only covers Amanda's personal well-being, it gives her mom the ability to manage her finances. Amanda's $4 million savings have been rapidly depleted, though it's unclear what she's been spending money on. The judge cautioned the parents not to make any significant deals without consulting with Amanda's lawyer.

The judge said he'd like to have some face-to-face time with Amanda, so he can make a firsthand evaluation.