Abstract: Provided is a lens barrel having, in order from an object side to an image side, a first to a third group lens, the lens barrel including: a fixed frame; a cam frame supported by the fixed frame so as to be rotationally movable in a optical axis direction between a forward and a backward movement ends; and a shutter frame which moves in the optical axis direction in a rotation restricted state, through the rotation of the cam frame, in which: a third group frame is fixed to the shutter frame so that the object side of the third group lens is arranged on an inner peripheral side of the shutter frame; and the second frame is configured so that the image side of the frame is stored on the inner peripheral side of the shutter frame when the cam frame is positioned at the backward movement end.

Abstract: A dry etching method includes a first step and a second step. The first step includes generating a first plasma from a gas mixture, which includes an oxidation gas and a fluorine containing gas, and performing anisotropic etching with the first plasma on a silicon layer to form a recess in the silicon layer. The second step includes alternately repeating an organic film forming process whereby an organic film is deposited on the inner surface of the recess with a second plasma, and an etching process whereby the recess covered with the organic film is anisotropically etched with the first plasma. When an etching stopper layer is exposed from a part of the bottom surface of the recess formed in the first step, the first step is switched to the second step.

Abstract: A zoom lens barrel includes a fixed frame, a rotary frame, a moving frame that moves in an optical axis direction with the rotary frame, a float key that is restricted from rotating and moves, an inner cam frame that has a cam follower, is rotationally driven by the rotary frame, and moves in the optical axis direction, a guide frame that has a cam follower, and moves in the optical axis direction, an outer cam frame moves in the optical axis direction with the guide frame, and moves relatively with respect to the guide frame, a second group zoom frame that holds a second group lens, has a cam follower, is restricted from rotating around the optical axis, and moves in the optical axis direction, and a first group zoom frame that holds a first group lens, has a cam follower, and moves in the optical axis direction.

Abstract: A dry etching method includes a first step and a second step. The first step includes generating a first plasma from a gas mixture, which includes an oxidation gas and a fluorine containing gas, and performing anisotropic etching with the first plasma on a silicon layer to form a recess in the silicon layer. The second step includes alternately repeating an organic film forming process whereby an organic film is deposited on the inner surface of the recess with a second plasma, and an etching process whereby the recess covered with the organic film is anisotropically etched with the first plasma. When an etching stopper layer is exposed from a part of the bottom surface of the recess formed in the first step, the first step is switched to the second step.

Abstract: Provided is a lens barrel having, in order from an object side to an image side, a first to a third group lens, the lens barrel including: a fixed frame; a cam frame supported by the fixed frame so as to be rotationally movable in a optical axis direction between a forward and a backward movement ends; and a shutter frame which moves in the optical axis direction in a rotation restricted state, through the rotation of the cam frame, in which: a third group frame is fixed to the shutter frame so that the object side of the third group lens is arranged on an inner peripheral side of the shutter frame; and the second frame is configured so that the image side of the frame is stored on the inner peripheral side of the shutter frame when the cam frame is positioned at the backward movement end.

Abstract: A zoom lens barrel includes a fixed frame, a rotary frame, a moving frame that moves in an optical axis direction with the rotary frame, a float key that is restricted from rotating and moves, an inner cam frame that has a cam follower, is rotationally driven by the rotary frame, and moves in the optical axis direction, a guide frame that has a cam follower, and moves in the optical axis direction, an outer cam frame moves in the optical axis direction with the guide frame, and moves relatively with respect to the guide frame, a second group zoom frame that holds a second group lens, has a cam follower, is restricted from rotating around the optical axis, and moves in the optical axis direction, and a first group zoom frame that holds a first group lens, has a cam follower, and moves in the optical axis direction.

Abstract: A disc drive apparatus is adapted to be driven when incorporated into a host appliance provided with a see-through section and comprises a disc receiving section for receiving a disc-shaped recording medium, a disc rotary drive mechanism for driving the disc-shaped recording medium to rotate, a recording and/or reproduction mechanism for recording information signals on and/or reproducing information signals from the disc-shaped recording medium and an apparatus main body arranged in correspondence to the see-through section formed in the host appliance and provided with a see-through hole exposing part of the disc-shaped recording medium placed on the disc receiving section to the outside of the host appliance by way of the see-through section.

Abstract: A compound lens on which a plastic lens is formed on a glass lens, having: an annular step part which is formed on the end part of the optical functional surface, on which the plastic lens is formed, on the outer circumference side on the outside of the outermost diameter of the optical functional surface and which is formed for directly mounting on a resin-made lens tube frame; and a caulk-fix part, being formed, in a form of a chamfer, in the outer form part of the glass lens on the optical functional surface on the opposite side of the optical functional surface on which the plastic lens is formed, wherein an influence of a heat on the plastic lens is eliminated when fixing the glass lens onto the resin-made lens tube frame by means of thermal caulking.

Abstract: The ceiling board of the cabinet of a disc drive apparatus has an abutment projection arranged at a position located vis-à-vis and projecting toward the turntable. The main surface of the abutment projection opposite to the main surface located vis-à-vis the turntable is supported by a top surface supporting section formed on the frame. With this arrangement, when the turntable is raised to the chucking position, the optical disc is pressed by the abutment projection of the ceiling board supported by the protruding section of the top surface supporting section at a part thereof surrounding the center hole of the optical disc so that the engaging projection is engaged with the center hole of the optical disc and the optical disc is held on the turntable in a state where the optical disc is anchored by a plurality of anchoring sections at a part thereof surrounding the center hole of the optical disc.

Abstract: A disc drive apparatus comprises a housing; a disc-holding unit that holds an optical disc in the housing; a disc-driving mechanism that rotates the optical disc held by the disc-holding unit; an optical pickup that writes signals in, and reads signals from, the optical disc being rotated by the disc-driving mechanism; and a pickup-moving mechanism that moves the optical pickup in a radial direction of the optical disc. The housing has an air-inlet port which is located above the optical disc held by the disc-holding unit and through which air is drawn from outside by virtue of an airflow that develops as the optical disc is rotated, and air-outlet ports through which air is discharged from the housing.

Abstract: There is disclosed a lens barrel including a fixed frame, a rotary frame rotatable with respect to the fixed frame to advance or retract in an optical axis direction, and a rectilinear guide frame rotatable relative to the rotary frame to displace integrally with the rotary frame in the optical axis direction. In this structure, a front end portion of the rectilinear guide frame on a subject side in the optical axis direction is exposed from the rotary frame.

Abstract: There is disclosed a lens barrel including a fixed frame, a rotary frame rotatable with respect to the fixed frame to advance or retract in an optical axis direction, and a rectilinear guide frame rotatable relative to the rotary frame to displace integrally with the rotary frame in the optical axis direction. In this structure, a front end portion of the rectilinear guide frame on a subject side in the optical axis direction is exposed from the rotary frame.

Abstract: The ceiling board of the cabinet of a disc drive apparatus has an abutment projection arranged at a position located vis-à-vis and projecting toward the turntable. The main surface of the abutment projection opposite to the main surface located vis-à-vis the turntable is supported by a top surface supporting section formed on the frame. With this arrangement, when the turntable is raised to the chucking position, the optical disc is pressed by the abutment projection of the ceiling board supported by the protruding section of the top surface supporting section at a part thereof surrounding the center hole of the optical disc so that the engaging projection is engaged with the center hole of the optical disc and the optical disc is held on the turntable in a state where the optical disc is anchored by a plurality of anchoring sections at a part thereof surrounding the center hole of the optical disc.

Abstract: A disc drive apparatus is adapted to be driven when incorporated into a host appliance provided with a see-through section and comprises a disc receiving section for receiving a disc-shaped recording medium, a disc rotary drive mechanism for driving the disc-shaped recording medium to rotate, a recording and/or reproduction mechanism for recording information signals on and/or reproducing information signals from the disc-shaped recording medium and an apparatus main body arranged in correspondence to the see-through section formed in the host appliance and provided with a see-through hole exposing part of the disc-shaped recording medium placed on the disc receiving section to the outside of the host appliance by way of the see-through section.

Abstract: A disc drive apparatus comprises a housing; a disc-holding unit that holds an optical disc in the housing; a disc-driving mechanism that rotates the optical disc held by the disc-holding unit; an optical pickup that writes signals in, and reads signals from, the optical disc being rotated by the disc-driving mechanism; and a pickup-moving mechanism that moves the optical pickup in a radial direction of the optical disc. The housing has an air-inlet port which is located above the optical disc held by the disc-holding unit and through which air is drawn from outside by virtue of an airflow that develops as the optical disc is rotated, and air-outlet ports through which air is discharged from the housing.