Abstract: An aperture unit includes a base plate, a cover, a plurality of aperture blades, a drive ring, and protrusions. The aperture blades are disposed between the base plate and the cover, and adjust the amount of light passing through by varying the size of an opening. The drive ring is disposed between the base plate and the cover, and is rotationally driven when the aperture blades are opened and closed. The protrusions are provided to the drive ring and the cover, respectively, and support the aperture blades in the direction of suppressing upward warpage of the aperture blades in a state in which the aperture blades move in the direction of reducing the size of the opening.

Abstract: An aperture unit includes a base plate, a cover, a plurality of aperture blades, a drive ring, and protrusions. The aperture blades are disposed between the base plate and the cover, and adjust the amount of light passing through by varying the size of an opening. The drive ring is disposed between the base plate and the cover, and is rotationally driven when the aperture blades are opened and closed. The protrusions are provided to the drive ring and the cover, respectively, and support the aperture blades in the direction of suppressing upward warpage of the aperture blades in a state in which the aperture blades move in the direction of reducing the size of the opening.

Abstract: A lens barrel in which a lens can be moved in a direction parallel to an optical axis includes: a first frame having a cam follower and a cam follower base that holds the cam follower; and a second frame that has a cam groove engageable with the cam follower. The first frame and the second frame are moved relatively to each other along the optical axis. The cam follower base has a first end connected to the main body of the first frame via at least one thin portion, and a second end not connected to the main body. The thin portion is formed such that a thickness of the thin portion in a radial direction of the lens barrel is smaller than that of the cam follower base.

Abstract: A lens barrel in which a lens can be moved in a direction parallel to an optical axis includes: a first frame having a cam follower and a cam follower base that holds the cam follower; and a second frame that has a cam groove engageable with the cam follower. The first frame and the second frame are moved relatively to each other along the optical axis. The cam follower base has a first end connected to the main body of the first frame via at least one thin portion, and a second end not connected to the main body. The thin portion is formed such that a thickness of the thin portion in a radial direction of the lens barrel is smaller than that of the cam follower base.

Abstract: A lens barrel in which a lens can be moved in a direction parallel to an optical axis includes: a first frame having a cam follower and a cam follower base that holds the cam follower; and a second frame that has a cam groove engageable with the cam follower. The first frame and the second frame are moved relatively to each other along the optical axis. The cam follower base has a first end connected to the main body of the first frame via at least one thin portion, and a second end not connected to the main body. The thin portion is formed such that a thickness of the thin portion in a radial direction of the lens barrel is smaller than that of the cam follower base.

Abstract: A lens barrel in which a lens can be moved in a direction parallel to an optical axis includes: a first frame having a cam follower and a cam follower base that holds the cam follower; and a second frame that has a cam groove engageable with the cam follower. The first frame and the second frame are moved relatively to each other along the optical axis. The cam follower base has a first end connected to the main body of the first frame via at least one thin portion, and a second end not connected to the main body. The thin portion is formed such that a thickness of the thin portion in a radial direction of the lens barrel is smaller than that of the cam follower base.

Abstract: According to an embodiment, a head stack assembly includes an arm including a swaged seat surface with swaged hole, a load beam supporting a head, and a baseplate secured to a proximal end portion of the load beam, including an annular protrusion secured to the swaged hole of the arm by swaging, and secured to the swaged seat surface. The arm includes a distal end portion located on a longitudinal end side of the arm with respect to the center of the swaged hole and being less rigid than the other portion of the arm around the swaged hole.

Abstract: A lens barrel is provided that includes an optical system, a housing, a cover member, an electronic part, a flexible substrate. The optical system is configured to form an optical image of a subject. The housing supports the optical system in an interior. The cover member supports the housing in a state of covering an opening of the housing. The electronic part is provided in the interior of the housing. The flexible substrate is electrically connected to the electronic part. The flexible substrate has a connection terminal. The cover member has a through-hole formed in a specific direction. The connection terminal is positioned on inside of the through-hole when viewed in the specific direction.

Abstract: A lens barrel includes a fixed frame, a rotary frame provided inside the fixed frame, a first frame provided inside the rotary frame, an electronic component provided inside the first frame, and a flexible printed circuit board connected, at one end thereof, to the electronic component and connected, at the other end thereof, to the fixed frame. A gear part is provided at an outer circumferential surface of the rotary frame. In the first frame, a first protrusion outwardly protruding beyond the gear part in a radial direction about the optical axis is provided at a position corresponding to the flexible printed circuit board in a circumferential direction about the optical axis on a side of the gear part opposite to the object in the optical axis direction.

Abstract: A lens barrel is provided that includes an optical system, a housing, a cover member, an electronic part, a flexible substrate. The optical system is configured to form an optical image of a subject. The housing supports the optical system in an interior. The cover member supports the housing in a state of covering an opening of the housing. The electronic part is provided in the interior of the housing. The flexible substrate is electrically connected to the electronic part. The flexible substrate has a connection terminal. The cover member has a through-hole formed in a specific direction. The connection terminal is positioned on inside of the through-hole when viewed in the specific direction.

Abstract: A lens barrel is provided that includes an optical system, a housing, a cover member, an electronic part, a flexible substrate. The optical system is configured to form an optical image of a subject. The housing supports the optical system in an interior. The cover member supports the housing in a state of covering an opening of the housing. The electronic part is provided in the interior of the housing. The flexible substrate is electrically connected to the electronic part. The flexible substrate has a connection terminal. The cover member has a through-hole formed in a specific direction. The connection terminal is positioned on inside of the through-hole when viewed in the specific direction.

Abstract: According to an embodiment, a head stack assembly includes an arm including a swaged seat surface with swaged hole, a load beam supporting a head, and a baseplate secured to a proximal end portion of the load beam, including an annular protrusion secured to the swaged hole of the arm by swaging, and secured to the swaged seat surface. The arm includes a distal end portion located on a longitudinal end side of the arm with respect to the center of the swaged hole and being less rigid than the other portion of the arm around the swaged hole.

Abstract: A collapsible lens barrel is provided, including a mechanism capable of reliably inhibiting rotation of a rotational barrel even if any impact is applied thereto, for example, due to a fall with the barrel being extended. When the rotational barrel is pressed upon a fixed member due to impact in defiance of the biasing force of a wave spring, a first engagement portion provided at a camera body-side end of the rotational barrel engages with second engagement portions provided on a subject-side surface of the fixed member, which locks rotation of the rotational barrel, thereby making it possible to prevent gears from being damaged, for example.

Abstract: According to one embodiment, a head gimbal assembly includes: base plate body; flexure; through hole passing through the base plate body; cylindrical base that upstands from the front surface of the base plate body, and has a first inner diameter; a cylindrical flange that continues to the base around the through hole and has a second inner diameter smaller than the first inner diameter; and inner wall surface that is defined by the flange and extends along a cylindrical surface formed by a generating line parallel to a central axis of the through hole. A ratio of a thickness T of the flange defined along a virtual plane orthogonal to the central axis of the through hole to a length L of the inner wall surface defined in a direction parallel to the central axis of the through hole is set to 1.5 or less.

Abstract: According to one embodiment, a magnetic head includes a write element, a first insulating member, and a second insulating member. The first insulating member is made of an insulating material with high rigidity. The first insulating member is formed around the write element as a surface layer of the floating surface. The second insulating member is made of an insulating material with lower rigidity than the first insulating member. The second insulating member is formed near the first insulating member around the write element beneath the surface layer of the floating surface. The first insulating member is polished on the floating surface. A portion of the floating surface where the second insulating member is arranged protrudes more than a portion of the floating surface around the write element.

Abstract: A magnetic head provided on a drain end side of a head substrate constituting a head slider includes a heater, a write coil, a shield, an insulation layer between the heater and the head substrate, a thermal insulation layer whose thermal conductivity is lower than the insulation layer and a thermal radiation layer whose thermal conductivity is higher than the shield, wherein the thermal insulation layer is disposed between the heater and the head substrate and the thermal radiation layer is disposed between the write coil and the head substrate.

Abstract: A method for manufacturing a head stack assembly that includes a pair of suspensions each of which supports a head, an arm that drives the head, and a pair of base plates that attach the pair of suspensions to both sides of the arm that has a perforation hole, each of the pair of base plates having a boss with an opening includes the step of swaging the pair of base plates with the arm by passing, in one direction, a processing member larger than the opening through the perforation hole and the base plates while the pair of base plates are being inserted into the perforation hole at both sides of the perforation hole, wherein where a neutral plane is defined as a plane that halves a thickness of the arm and is perpendicular to a section that includes a center axis of the perforation hole, a first position is defined as a position that has a minimum internal diameter of the base plate, and a second position is defined as a position closest to the neutral plane among contact positions between the base plates an

Abstract: According to an aspect of an embodiment, a magnetic head includes: a write element including a first magnetic pole and a second magnetic pole magnetically connected to the first magnetic pole; and a nonmagnetic insulating layer made of inorganic material surrounding the write element. The magnetic head further includes: upper and lower low-thermal-expansion material layers disposed on and under the nonmagnetic insulating layer, respectively, the low-thermal-expansion material layers having a thermal coefficient lower than that of the nonmagnetic insulating layer; and a heater element embedded in the nonmagnetic insulating layer.

Abstract: A collapsible lens barrel is provided, including a mechanism capable of reliably inhibiting rotation of a rotational barrel even if any impact is applied thereto, for example, due to a fall with the barrel being extended. When the rotational barrel is pressed upon a fixed member due to impact in defiance of the biasing force of a wave spring, a first engagement portion provided at a camera body-side end of the rotational barrel engages with second engagement portions provided on a subject-side surface of the fixed member, which locks rotation of the rotational barrel, thereby making it possible to prevent gears from being damaged, for example.

Abstract: A magnetic head structure has a coil and a magnetic pole allowing a magnetic flux generated by the coil to be transmitted therethrough and forming a magnetic gap. An insulating layer surrounds the coil, and a protective layer covers the insulating layer and the magnetic pole. The insulating layer has a volume equal to or greater than a value which is determined with respect to a thickness of the protective layer. It is preferable to increase the volume of the insulating layer as the thickness of the protective layer is made greater. By increasing the volume of the insulating layer, the protrusion of a portion of a floating surface of the magnetic head slider near the magnetic pole, toward the disk, is reduced.