Abstract: A communication system includes a user terminal that transmits and receives a message, and a server device that manages a public key and a private key, wherein the user terminal includes first processing circuitry configured to, when transmitting the message to another user terminal, acquire a public key corresponding to identification information about a recipient of the message, and encrypt the message or a file attached to the message, using the acquired public key, transmit, to the another user terminal, the message encrypted or the file attached to the message, when receiving the message from the another user terminal, request the server device to provide a private key for decrypting the message or the file attached to the message, and receive the private key from the server device, and decrypt the message or the file attached to the message, using the private key received.

Abstract: A zoom lens includes, in order from an object side to an image side, a front group including a plurality of lens units, an image stabilizing unit having negative refractive power, and a rear group including one or more lens units. Each distance between adjacent lens units changes during zooming. The front group has a focus unit and an aperture stop. Predetermined inequalities are satisfied.

Abstract: A zoom lens includes, in order from an object side to an image side, a first lens unit having negative refractive power, and a rear group including two or more lens units, and an aperture stop. The rear group includes an image stabilizing unit having negative refractive power and configured to move with a component in a direction orthogonal to an optical axis during image stabilization, and a focus unit disposed on the object side of the image stabilizing unit. A distance between adjacent lens units changes during zooming. A predetermined inequality is satisfied.

Abstract: An optical system includes, in order from an object side to an image side, a front group, an aperture stop, and a rear group that has positive refractive power as a whole. The front group includes a first lens having negative refractive power disposed closest to an object. The rear group includes a final lens having positive refractive power disposed closest to an image plane. The optical system includes four or more lenses disposed between the first lens and the final lens. A lens surface near an optical axis of the final lens has a meniscus shape with a convex surface on the object side. Predetermined inequalities are satisfied.

Abstract: According to an embodiment, a semiconductor memory device comprises: a stacked body that includes a plurality of control gate electrodes stacked above a substrate; a memory columnar body that extends in a first direction above the substrate and configures a memory string along with the stacked body; and a source contact that extends in the first direction and is electrically connected to one end of the memory string. Moreover, this source contact is adjacent to the stacked body via a spacer insulating layer. Furthermore, a spacer protective layer including a nitride or a metal oxide is provided between these source contact and spacer insulating layer.

Abstract: According to an embodiment, a semiconductor memory device comprises: a stacked body that includes a plurality of control gate electrodes stacked above a substrate; a memory columnar body that extends in a first direction above the substrate and configures a memory string along with the stacked body; and a source contact that extends in the first direction and is electrically connected to one end of the memory string. Moreover, this source contact is adjacent to the stacked body via a spacer insulating layer. Furthermore, a spacer protective layer including a nitride or a metal oxide is provided between these source contact and spacer insulating layer.

Abstract: A control apparatus is provided for a camera system that includes an image pickup apparatus including an image sensor and a lens apparatus including an optical system that includes at least one optical member for changing at least one of a tilt effect of tilting a focal plane relative to an imaging plane of the image sensor and a shift effect of moving an imaging range. The control apparatus includes at least one memory that stores a set of instructions, and at least one processor that executes the set of instructions to acquire information on an optical state of the optical system, and correct defocus caused by movement of the at least one optical member using the information on the optical state of the optical system.

Abstract: An optical system consists of, in order from an object side to an image side, a front unit, an aperture stop, and a rear unit having positive refractive power as a whole. The rear unit includes a final lens disposed closest to the image side and having positive refractive power. A number of inequalities relating to the spatial relationship between the lenses and their refractive powers are satisfied.

Abstract: An optical system includes, in order from an object side to an image side, a positive first lens unit (L1), a negative second lens unit (L2), a positive third lens unit (L3), and a negative fourth lens unit (L4), wherein distances between adjacent lens units change during focusing, at least the L2 and the L4 move during focusing, the L4 consists of negative and positive partial units, an air distance between the negative and positive partial units is the largest among those between adjacent lenses in the L4, and 0.45<D4np/D4<0.95 is satisfied, D4 being a distance on an optical axis from a most object-side lens surface to a most image-side lens surface in the L4 and D4np being the air distance between the negative partial unit and the positive partial unit in L4.

Abstract: A zoom lens including, in order from object side to image side, first to fourth lens units respectively having positive, negative, positive, and positive refractive powers. During zooming from a wide-angle end to a telephoto end, the first lens unit is arranged to move, the distance between the first lens unit and the second lens unit increases, the distance between the second lens unit and the third lens unit decreases, and the distance between the third lens unit and the fourth lens unit decreases. The second lens unit consists of a first lens having a negative refractive power and a second lens having a positive refractive power, the second lens being disposed on the image side of the first lens. A predetermined condition is satisfied.

Abstract: According to one embodiment, a semiconductor memory device incudes: a stacked body in which a plurality of first conductive layers and a plurality of first insulating layers are alternately stacked one by one; and a contact that extends in the stacked body in the stacking direction, and is connected to a structure arranged on in the stacked body or below the stacked body. The contact includes: a second conductive layer that extends in the stacked body LM in the stacking direction, and serves as a core of the contact; and a second insulating layer that covers a sidewall of the second conductive layer, and serves as a liner of the contact.

Abstract: An optical system includes a plurality of lenses and a diaphragm. The plurality of lenses consist of, in order from an object side to an image side, a first lens having a positive refractive power, a second lens having a positive refractive power, a third lens having a negative refractive power, a fourth lens, a fifth lens, and a sixth lens. The diaphragm is located between the first lens and the second lens. A predetermined condition is satisfied.

Abstract: An optical system includes an object side lens unit arranged closest to an object, immobilized in focusing, and having a positive refractive power, an image plane side lens unit arranged closest to an image plane and having a negative refractive power, and a first focus lens unit and a second focus lens unit which are arranged between the object side lens unit and the image plane side lens unit and are moved in focusing. The object side lens unit consists of a first partial unit having the negative refractive power, a second partial unit having the positive refractive power, a third partial unit having the positive or the negative refractive power which are arranged in order from an object side to an image plane side. The second partial unit is moved in a direction including a component in a perpendicular direction to an optical axis in image blur correction.

Abstract: An optical system includes a front lens group and a rear lens group that are disposed in order from an object side to an image side of the optical system, the front lens group having a positive refractive power and the rear lens group having a negative refractive power. The rear lens group consists of a lens unit Ln1 that is arranged to move towards the image side when focusing and that has a negative refractive power, and a lens unit Ln2 that is disposed closer to the image side than the lens unit Ln1 and that has a negative refractive power. The front lens group includes a lens unit Lpf arranged to move during focusing. The rear lens group satisfies a predetermined conditional expression.

Abstract: The optical system according to the present invention consists of a first lens unit with positive refractive power disposed closest to an object side, a middle group including at least two lens units, and a final lens unit with negative refractive power disposed closest to an image side in which intervals between adjacent lens units are changed during focusing. The middle group includes a first focus lens unit configured to move during focusing, and a second focus lens unit disposed on the image side of the first focus lens unit and configured to move during focusing. An aperture stop is disposed between two lenses included in the middle group. Here, a focal length of the optical system, a focal length of the final lens unit, and a focal length of a second focus lens unit are appropriately determined.

Abstract: A zoom lens including, in order from object side to image side, first to fourth lens units respectively having positive, negative, positive, and positive refractive powers. During zooming from a wide-angle end to a telephoto end, the first lens unit is arranged to move, the distance between the first lens unit and the second lens unit increases, the distance between the second lens unit and the third lens unit decreases, and the distance between the third lens unit and the fourth lens unit decreases. The second lens unit consists of a first lens having a negative refractive power and a second lens having a positive refractive power, the second lens being disposed on the image side of the first lens. A predetermined condition is satisfied.

Abstract: According to one embodiment, a semiconductor memory device includes: a memory cell array including: a plurality of memory cells stacked above a substrate, and a plurality of word lines respectively coupled to gates of the plurality of memory cells and extending in a first direction; and a first film including a first area above the memory cell array and a second area different from the first area, and having a compressive stress higher than silicon oxide. In the first area, a plurality of first trenches extending in the first direction are aligned in a second direction that intersects the first direction. In the second area, a second trench in a mesh form is provided.

Abstract: According to an embodiment, a semiconductor memory device comprises: a stacked body that includes a plurality of control gate electrodes stacked above a substrate; a memory columnar body that extends in a first direction above the substrate and configures a memory string along with the stacked body; and a source contact that extends in the first direction and is electrically connected to one end of the memory string. Moreover, this source contact is adjacent to the stacked body via a spacer insulating layer. Furthermore, a spacer protective layer including a nitride or a metal oxide is provided between these source contact and spacer insulating layer.

Abstract: According to one embodiment, a semiconductor memory device includes: a memory cell array including: a plurality of memory cells stacked above a substrate, and a plurality of word lines respectively coupled to gates of the plurality of memory cells and extending in a first direction; and a first film including a first area above the memory cell array and a second area different from the first area, and having a compressive stress higher than silicon oxide. In the first area, a plurality of first trenches extending in the first direction are aligned in a second direction that intersects the first direction. In the second area, a second trench in a mesh form is provided.