Abstract: The optical disc device has a circuit which forms a focus error signal for focus servo control based on reflection light from an optical disc exposed to laser light. Also, the device has a data processing unit which can control by feedback a position to which an objective lens is moved by a focusing actuator based on a focus error signal. In label printing, the data processing unit controls, by feedforward, a position to which the objective lens is moved by the focusing actuator based on control data for label printing. The operation resolution of the focusing actuator in feedforward control is made higher than that in feedback control. Thus, an intended position control accuracy is achieved in feedforward control. For instance, in feedforward control, the gain of the driver circuit for the focusing actuator is switched to a smaller one in comparison to that in feedback control.

Abstract: The optical disc device has a circuit which forms a focus error signal for focus servo control based on reflection light from an optical disc exposed to laser light. Also, the device has a data processing unit which can control by feedback a position to which an objective lens is moved by a focusing actuator based on a focus error signal. In label printing, the data processing unit controls, by feedforward, a position to which the objective lens is moved by the focusing actuator based on control data for label printing. The operation resolution of the focusing actuator in feedforward control is made higher than that in feedback control. Thus, an intended position control accuracy is achieved in feedforward control. For instance, in feedforward control, the gain of the driver circuit for the focusing actuator is switched to a smaller one in comparison to that in feedback control.

Abstract: The optical disc device has a circuit which forms a focus error signal for focus servo control based on reflection light from an optical disc exposed to laser light. Also, the device has a data processing unit which can control by feedback a position to which an objective lens is moved by a focusing actuator based on a focus error signal. In label printing, the data processing unit controls, by feedforward, a position to which the objective lens is moved by the focusing actuator based on control data for label printing. The operation resolution of the focusing actuator in feedforward control is made higher than that in feedback control. Thus, an intended position control accuracy is achieved in feedforward control. For instance, in feedforward control, the gain of the driver circuit for the focusing actuator is switched to a smaller one in comparison to that in feedback control.

Abstract: The optical disc device has a circuit which forms a focus error signal for focus servo control based on reflection light from an optical disc exposed to laser light. Also, the device has a data processing unit which can control by feedback a position to which an objective lens is moved by a focusing actuator based on a focus error signal. In label printing, the data processing unit controls, by feedforward, a position to which the objective lens is moved by the focusing actuator based on control data for label printing. The operation resolution of the focusing actuator in feedforward control is made higher than that in feedback control. Thus, an intended position control accuracy is achieved in feedforward control. For instance, in feedforward control, the gain of the driver circuit for the focusing actuator is switched to a smaller one in comparison to that in feedback control.

Abstract: The optical disc device has a circuit 4 which forms a focus error signal FER for focus servo control based on reflection light from an optical disc exposed to laser light. A data processing unit 2 can control by feedback a position to which an objective lens is moved by a focusing actuator 30 based on the focus error signal. In label printing, the data processing unit controls, by feedforward, a position to which the objective lens is moved by the focusing actuator based on control data for label printing. The operation resolution of the focusing actuator in feedforward control is made higher than that in feedback control. Thus, an intended position control accuracy is achieved in feedforward control. For instance, in feedforward control, the gain of the driver circuit 40 for the focusing actuator is switched to a smaller one in comparison to that in feedback control.

Abstract: A small and thin surface-mount type optical semiconductor device having high air tightness, which can be manufactured at a reduced cost includes: a base 2 formed of a glass substrate; a recess 5 formed on a first main surface 3 of the base; a through hole 7 extending from a bottom portion 4 of the recess to a second main surface 6 of the base; an inner wall conductive film formed on an inner wall surface of the through hole; a wiring pattern 9 made of a conductive film formed around an opening of the through hole on the bottom portion of the recess so as to be connected electrically to the inner wall conductive film; an optical semiconductor element 8 bonded to the wiring pattern via a conductive bonding material 14; a terminal portion 10 made of a conductive film formed around an opening of the through hole on the second main surface such that it is connected electrically to the inner wall conductive film; and a metal portion 13 bonded to the inner wall conductive film to clog the through hole.

Abstract: A small and thin surface-mount type optical semiconductor device having high air tightness, which can be manufactured at a reduced cost includes: a base 2 formed of a glass substrate; a recess 5 formed on a first main surface 3 of the base; a through hole 7 extending from a bottom portion 4 of the recess to a second main surface 6 of the base; an inner wall conductive film formed on an inner wall surface of the through hole; a wiring pattern 9 made of a conductive film formed around an opening of the through hole on the bottom portion of the recess so as to be connected electrically to the inner wall conductive film; an optical semiconductor element 8 bonded to the wiring pattern via a conductive bonding material 14; a terminal portion 10 made of a conductive film formed around an opening of the through hole on the second main surface such that it is connected electrically to the inner wall conductive film; and a metal portion 13 bonded to the inner wall conductive film to clog the through hole.

Abstract: A small and thin surface-mount type optical semiconductor device having high air tightness, which can be manufactured at a reduced cost includes: a base 2 formed of a glass substrate; a recess 5 formed on a first main surface 3 of the base; a through hole 7 extending from a bottom portion 4 of the recess to a second main surface 6 of the base; an inner wall conductive film formed on an inner wall surface of the through hole; a wiring pattern 9 made of a conductive film formed around an opening of the through hole on the bottom portion of the recess so as to be connected electrically to the inner wall conductive film; an optical semiconductor element 8 bonded to the wiring pattern via a conductive bonding material 14; a terminal portion 10 made of a conductive film formed around an opening of the through hole on the second main surface such that it is connected electrically to the inner wall conductive film; and a metal portion 13 bonded to the inner wall conductive film to clog the through hole.

Abstract: The optical disc device has a circuit 4 which forms a focus error signal FER for focus servo control based on reflection light from an optical disc exposed to laser light. A data processing unit 2 can control by feedback a position to which an objective lens is moved by a focusing actuator 30 based on the focus error signal. In label printing, the data processing unit controls, by feedforward, a position to which the objective lens is moved by the focusing actuator based on control data for label printing. The operation resolution of the focusing actuator in feedforward control is made higher than that in feedback control. Thus, an intended position control accuracy is achieved in feedforward control. For instance, in feedforward control, the gain of the driver circuit 40 for the focusing actuator is switched to a smaller one in comparison to that in feedback control.

Abstract: A small and thin surface-mount type optical semiconductor device having high air tightness, which can be manufactured at a reduced cost includes: a base 2 formed of a glass substrate; a recess 5 formed on a first main surface 3 of the base; a through hole 7 extending from a bottom portion 4 of the recess to a second main surface 6 of the base; an inner wall conductive film formed on an inner wall surface of the through hole; a wiring pattern 9 made of a conductive film formed around an opening of the through hole on the bottom portion of the recess so as to be connected electrically to the inner wall conductive film; an optical semiconductor element 8 bonded to the wiring pattern via a conductive bonding material 14; a terminal portion 10 made of a conductive film formed around an opening of the through hole on the second main surface such that it is connected electrically to the inner wall conductive film; and a metal portion 13 bonded to the inner wall conductive film to clog the through hole.

Abstract: An operational margin of a memory of a semiconductor integrated circuit device including an SRAM is improved. In order to set the Vth of driving MISFETs Qd, transfer MISFETs Qt and MISFETs for load resistance QL forming memory cells of an SRAM, relatively and intentionally higher than the Vth of predetermined MISFETs of SRAM peripheral circuits and logic circuits such as microprocessor, an impurity introduction step is introduced to set the Vth of the driving MISFETs Qd, transfer MISFETs Qt and MISFETs for load resistance, separately from an impurity introduction step for setting the Vth of the predetermined MISFETs.

Abstract: An operational margin of a memory of a semiconductor integrated circuit device including an SRAM is improved. In order to set the Vth of driving MISFETs Qd, transfer MISFETs Qt and MISFETs for load resistance QL forming memory cells of an SRAM, relatively and intentionally higher than the Vth of predetermined MISFETs of SRAM peripheral circuits and logic circuits such as microprocessor, an impurity introduction step is introduced to set the Vth of the driving MISFETs Qd, transfer MISFETs Qt and MISFETs for load resistance, separately from an impurity introduction step for setting the Vth of the predetermined MISFETs.

Abstract: An operational margin of a memory of a semiconductor integrated circuit device including an SRAM is improved. In order to set the Vth of driving MISFETs Qd, transfer MISFETs Qt and MISFETs for load resistance QL forming memory cells of an SRAM, relatively and intentionally higher than the Vth of predetermined MISFETs of SRAM peripheral circuits and logic circuits such as microprocessor, an impurity introduction step is introduced to set the Vth of the driving MISFETs Qd, transfer MISFETs Qt and MISFETs for load resistance, separately from an impurity introduction step for setting the Vth of the predetermined MISFETs.

Abstract: An operational margin of a memory of a semiconductor integrated circuit device including an SRAM is improved. In order to set the Vth of driving MISFETs Qd, transfer MISFETs Qt and MISFETs for load resistance QL forming memory cells of an SRAM, relatively and intentionally higher than the Vth of predetermined MISFETs of SRAM peripheral circuits and logic circuits such as microprocessor, an impurity introduction step is introduced to set the Vth of the driving MISFETs Qd, transfer MISFETs Qt and MISFETs for load resistance, separately from an impurity introduction step for setting the Vth of the predetermined MISFETs.

Abstract: An operational margin of a memory of a semiconductor integrated circuit device including an SRAM is improved. In order to set the Vth of driving MISFETs Qd, transfer MISFETs Qt and MISFETs for load resistance QL forming memory cells of an SRAM, relatively and intentionally higher than the Vth of predetermined MISFETS of SRAM peripheral circuits and logic circuits such as microprocessor, an impurity introduction step is introduced to set the Vth of the driving MISFETs Qd, transfer MISFETs Qt and MISFETs for load resistance, separately from an impurity introduction step for setting the Vth of the predetermined MISFETS.

Abstract: An operational margin of a memory of a semiconductor integrated circuit device including an SRAM is improved. In order to set the Vth of driving MISFETs Qd, transfer MISFETs Qt and MISFETs for load resistance QL forming memory cells of an SRAM, relatively and intentionally higher than the Vth of predetermined MISFETs of SRAM peripheral circuits and logic circuits, such as a microprocessor, an impurity introduction step is introduced to set the Vth of the driving MISFETs Qd, transfer MISFETs Qt and MISFETs for load resistance, separately from an impurity introduction step for setting the Vth of the predetermined MISFETs.

Abstract: In the viewfinder optical system of a reflex camera with a film holder which is rotatable to change the orientation of the oblong image on its film, a viewfinder mask orienting device supporting a square focusing screen has two pairs of rotatable masking blades, the two blades of each pair being integrally joined in Vee shape, which are actuated by the rotation of the film holder to operate cooperatively to alternately mask edge parts of the two pairs of opposed sides of the focusing screen thereby to form an oblong viewfinder image and change the orientation of this image to conform to that of the image on the film.