Canon Kabushiki Kaisha

Hideki Sakai

Atsushi Matsumoto

Yukihiko Shimizu

Takeshi Namikata

Noriyuki Kobayashi

Hirohiko Tashiro

Yushi Matsukubo

Junichi Mori

Shinichiro Maekawa

Masamichi Akashi

Masataka Yasuda

Takashi Okazawa

Yuichi Higuchi

Naoki Tuchitoi

Tadanori Okada

Shunji Iwamoto

Kiyohiro Tsunekawa

Takeshi Utsunomiya

Ken Onodera

Masahiro Takayanagi

Takanori Nishijima

Koichiro Akimoto

Yasuko Shibahara

A lens apparatus includes an operation member that is rotatable by a user operation, a zoom lens configured to perform zooming in accordance with a rotation of the operating member, and a detector configured to divide an entire zoom range from a wide-angle end to a telephoto end, and detect a zoom position of the zoom lens. A predetermined condition is satisfied.

Lens apparatus and image pickup apparatus

The lens apparatus includes an optical system, a voltage transformation unit, and an actuator. A first lens unit of the optical system is moved toward the object side during zooming from a wide-angle end to a telephoto end. The voltage transformation unit includes coils. The actuator is configured to be driven by a voltage output from the voltage transformation unit and to move a part of the lens units in the optical system during focusing. The coil is disposed at a position that is separated from a position of a most object-side surface of the optical system at the wide-angle end, toward the image side by a maximum or more moving amount of the first lens unit, and is closer to the object side than a most image-side surface of the optical system at the wide-angle end.

Lens apparatus and camera system

Provided is the image pickup optical system including a first lens unit, a second lens unit, and a third lens unit disposed in an order from an object side to an image side, in which an interval between adjacent lens units is changed during focusing. The third lens unit includes an aperture stop. A distance on an optical axis from a lens surface closest to object side to aperture stop when focused at infinity Lf, a distance on optical axis from aperture stop to a lens surface closest to image side when focused at infinity Lr, a distance on optical axis from a lens surface closest to object side to an image plane when focused at infinity L, a focal length of the entire system f, and a moving amount of first lens unit during focusing from infinity to a closest distance M are appropriately set.

Image pickup optical system, image pickup apparatus having the image pickup optical system, lens apparatus having the image pickup optical system, and image pickup system having the image pickup optical system

A zoom lens includes, in order from an object side to an image side, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, a third lens unit having a positive refractive power, and a fourth lens unit having a positive refractive power. Each lens unit moves so that a distance between adjacent lens units changes during zooming. The third lens unit includes a positive lens Gclosest to the image side which has a concave meniscus surface on an image side. A conditional expression 0.03&#x3c;R3i2/ft&#x3c;0.25 is satisfied where R3i2 is a radius of curvature of a lens surface on the image side of the positive lens G, and ft is a focal length of the overall system at a telephoto end.

Zoom lens and image-pickup apparatus having the same

A zoom lens includes, in order from an object side to an image side: a positive first lens unit; a positive second lens unit; and an aperture stop disposed between the first and second lens units and moving along a locus different from loci of the first and the second lens units during zooming, the first and second lens units being configured to change an interval therebetween during zooming, the second lens unit including at least one positive lens and at least one negative lens. A distance from a lens surface closest to the object side in the entire system to the aperture stop at a wide angle end, and a distance from the lens surface closest to the object side in the entire system to a lens surface closest to the object side in the second lens unit at the wide angle end are each appropriately set.

Zoom lens and image pickup apparatus including the same

A zoom lens includes, in order from an object side to an image side, a first lens unit having positive refractive power, a second lens unit having negative refractive power, and a third lens unit having positive refractive power, wherein at least the first to third lens units move during zooming from a wide-angle end to a telephoto end, and a focal length f2 of the second lens unit, a focal length ft of the entire zoom lens at the telephoto end, and a refractive index Nd2n of a lens having negative refractive power closest to the object side included in the second lens unit are appropriately set.

Positive-lead type zoom lens and image pickup apparatus equipped with the same

An optical system includes an aperture diaphragm having such a curved surface shape that an aperture part moves in an optical axis direction as an aperture diameter changes. The aperture diaphragm has a convex shape on an object side when an optical system on the object side of the aperture diaphragm has a negative refractive power, and the aperture diaphragm has a convex shape on an image side when the optical system on the object side of the aperture diaphragm has a positive refractive power.

Optical system, and image pickup apparatus having the same

A zoom lens includes a first lens unit having a negative refractive power, a second lens unit having a positive refractive power, and a third lens unit having a positive refractive power. The first lens unit, the second lens unit, and the third lens unit are arranged in order from an object side to an image side. Distances between the lens units change during zooming. The first lens unit consists of two lenses. Radii of curvature of a lens surface closest to the object side and a lens surface closest to the image side in the first lens unit, a focal length of the first lens unit, and a focal length of the entire zoom lens at a telephoto end are set appropriately.

Zoom lens and image pickup apparatus using the same

A zoom lens includes a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, a third lens unit having a positive refractive power, and a rear group including at least one lens unit. The first lens unit, the second lens unit, the third lens unit, and the rear group are arranged in order from an object side to an image side. The second and third lens units move for zooming. Imaging magnifications of the second lens unit at a wide angle end and a telephoto end, imaging magnifications of the third lens unit at the wide angle end and the telephoto end, a moving amount of the third lens unit along an optical axis during zooming from the wide angle end to the telephoto end, and a total lens length at the telephoto end are set based on predetermined conditions.

If a print job is designated to interrupt print, processing of any print job currently being processed is interrupted, print processing of the instructed print job is immediately performed and resumption of the interrupted print job is automatically performed afterward. Further, if an interrupt print occurs, the sending source of the interrupted print jobs (host computers, etc.) are notified that an interrupt occurred.

Print control apparatus, print control method, memory medium for storing print control program, and print control program

In a computer system including a job scheduler which divides an input job and determines a client apparatus to assign the divided job, and a task manager which transmits the divided job to the client apparatus determined by the job scheduler, the job scheduler assigns the same job to a plurality of client apparatuses when the number of client apparatuses is larger than the number of divided jobs, and when the job is finished in one of the plurality of client apparatuses assigned the same job, execution of the job in the remaining client apparatuses is canceled so that the time until all jobs are finished is shortened.

Divided job scheduler

Provided is a zoom lens including in order from an object side to an image side: a first lens unit having a positive refractive power; a second lens unit having a negative refractive power; a third lens unit having a positive refractive power; and a fourth lens unit having a positive refractive power, each of the first lens unit, the second lens unit, the third lens unit, and fourth lens unit moving to perform zooming, in which Mrepresenting a moving amount of the third lens unit on an optical axis during zooming from a wide angle end to a telephoto end, Lt representing a total lens length on the telephoto end, frepresenting a focal length of the third lens unit, and ft representing a focal length of an entire lens system on the telephoto end are each appropriately set.

Even when a CPU gains higher performance and a distributed computing environment is being put in place, it is not easy to follow the speed of hardware image processing implemented by dedicated hardware. Hence, jobs of filter processing having a heavy operation load and low distributability are selectively and intensively input to a small number of resources having performance as high as possible. On the other hand, since the color conversion processing and gamma processing have high distributability, even when jobs are input to many resources having low performance, an improvement of the processing speed can be expected. Therefor, color conversion processing and gamma processing distribute jobs to many resources.

Information processing apparatus and its control method

In a network print system in which a printer and at least one client are connected to each other through a network, and at least a part of a job for the printer can be subjected to load distributed processing by grid computing, wherein when a printer driver of the printer is installed on any one of the at least one client, the system is adapted to build a grid computing network. In this arrangement, it is easily to build the grid computing network in which the printer job is subjected to load distributed processing.

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Sakura, Japan

Hideki Sakai