jump control as to temporarily release a focus servo on one layer of a loaded multilayer optical recording medium shift the focus position of read light on another target layer and then restart the focus servo on the another target layer detects an ambient temperature sets a drive signal condition according to the temperature detection output and moves the focus position of the read light under the set drive signal condition specifically this apparatus generates an acceleration signal to start moving the focus position of read light and a deceleration signal to decelerate movement of the focus position of the read light as drive signals for a focus actuator in order to execute a focus jump operation detects an ambient temperature of the focus actuator and sets signal conditions for the acceleration signal and the deceleration signal according to the detected temperature application_number US 11200498 A description a preferred embodiment of the present invention will now be described in detail referring to the accompanying drawings fig2 shows the schematic constitution of a double layer optical disk player which uses a focus control apparatus according to one embodiment of this invention referring to fig2 a disk 1 loaded in the player.