Patent ID: 7773345

Claim:
A carriage for a disc device, fixed to a base of the disc device, the carriage comprising: an arm member including a top arm, a bottom arm, and at least one mid arm provided between the top and bottom arms; a rotary support portion which supports the arm member for rotation; and at least one suspension which is attached to the top, bottom, or mid arm and on which a head for access to information for a disc is mounted, the carriage having, with respect to a frequency response obtained when fixed to the base or a member equivalent to the base, a main mode in which all of the top, bottom, and mid arms swing at a first frequency within the same phase in a primary bending mode, an end arm mode in which the top and bottom arms swing at a second frequency higher than the first frequency within opposite phases and with an amplitude larger than that of the mid arm, and a mid arm mode in which the mid arm swings at a third frequency which has a difference of 50 Hz or less from the second frequency within the same phase as in the main mode and both the top and bottom arms swing within the phase opposite from that in the main mode.