Canon Kabushiki Kaisha

Takashi Matsushita

Keiji Ikemori

Tsunefumi Tanaka

Nozomu Kitagishi

Sadatoshi Takahashi

Akira Ueda

Kouji Oizumi

Kiyotaka Miura

Tsunehiro Tsukada

Masaki Tamura

Yasuyuki Tsukui

Hiroki Nakayama

Kikuo Momiyama

Yasuyuki Yamada

Hideki Ogawa

Yukio Ogawa

Hideo Tamamura

Yasuhisa Sato

Kazuo Ikawa

Toru Shoji

A display apparatus able to perform appropriate and accurate focusing. An image displayed on a display unit is stored in a first storage unit, a focus position of the image is moved by a movement unit, and the image obtained after the focus position movement is stored in a second storage unit. The images stored in the first and second storage units are compared by a comparison unit on a pixel basis, and based on a result of the comparison, an image area where there is a change in pixel state is extracted by an extraction unit, a contrast value in the extracted image area is calculated by a calculation unit, and a change in the calculated contrast values is determined by a determination unit. Based on a result of the determination, the attribute of pixels in the extracted image area is changed by a change unit.

Display apparatus and display method

There is disclosed a network print system which aims at printing high-quality image data of, e.g., a form or the like generated using a Web browser. When a form image is displayed on a Web browser of a client, and its print process is instructed, the instruction is sent to a server. The server searches a form template storage unit for an appropriate template, merges it with data by an image generation unit, converts the merged data into PDL data by a print output unit, and prints the converted data as a high-quality image from a printer.

Network print system, and information processing apparatus and its control method

A network print system which aims at printing high-quality image data of a form is generated using a Web browser. In response to a request from a client to print or to display a document, a server merges an appropriate template with the variable data to produce print data or display data, as the case may be; however, based on whether certain authorization or restriction conditions are applicable to the request being processed, the server in an appropriate case inhibits generation of print data or display data, so that the print request or display request is not fulfilled.

Network print system for merging data with template data for printing or display, subject to applicable restrictions

A zoom lens comprising, from front to rear, a first lens unit of negative power, a second lens unit of positive power and a third lens unit of negative power, the second and third lens units being moved to effect zooming, and the third lens unit having its focal length f.sub.3 laid in the following range:

Compact zoom lens

A distance measuring device has a light source for emitting a plurality of light beams in a plurality of directions, and a light receiving lens having a plurality of optical axes for receiving the plurality of light beams reflected from objects in said plurality of directions. Light receiving apparatus is provided for receiving the reflected light beams passing through said light receiving lens and providing an output corresponding to distances to the object. The light receiving lens has (1) a central portion with a thickness (D), a focal length f.sub.a, and a refractive index .phi..sub.A, and (2) a second portion adjacent said central portion. Surfaces of said central and second portions closest to said light receiving apparatus comprising one spherical surface having a refractive power .phi..sub.R. the central and second portions being disposed to satisfy the following conditions:

Automatic multi-point distance measuring device

A finder device capable of forming an erecting non-reverse image to be observed at either of the waist level and the eye level, wherein when used as the waist-level finder, the photographer, while taking his eye at a good distance from the finder, can observe the image of an object to be photographed.

Finder device

A flash device for a camera of the kind using a miniature lamp type flash tube solves all the problems resulting from the use of the straight tube type flash tube. The disclosed arrangement of the flash device not only ensures an adequate light distributing characteristic in all the vertical and lateral directions but also permits reduction in size of an electronic flash unit.

Flash device for a camera

A photographic lens comprising, from front to rear, a first lens unit of positive power, a stop, a second lens unit of positive power, a third lens unit of negative power and a fourth lens unit of positive power. The first lens unit has at least one negative lens having a strong concave surface facing the stop, and the second lens unit has at least one negative lens having a strong concave surface facing the stop. When focusing is performed from an infinitely distant object to a close object, the first and second lens units are moved forward in unison, while the third lens unit is moved by a less amount than the amount of movement of the first and second lens units, whereby closeup optical performance is improved.

Photographic lens of improved near distance performance

A zoom lens including, from front to rear, a first lens unit of positive power, a second lens unit of negative power and a third lens unit of positive power, wherein for a standard focal length range at least the first and second lens units move simultaneously and independently of each other, and to obtain a focal length beyond the standard range, at least the second lens unit moves, whereby the locus of movement of the first lens unit bends at an end of the standard range, and as the standard range is exceeded, the first lens unit either remains stationary or moves forward.

Zoom lens capable of selecting a focal length beyond a standard focal

A zoom lens comprising, from front to rear, a first zoom section and a second zoom section, the first zoom section having a plurality of movable lens units which simultaneously move to effect zooming, and the second zoom section having a plurality of axially movable lens units, the light beam exiting from the rearmost unit in the first section enters directly the frontmost unit in the second section, and the refractive powers of the front and rear lens units are made positive and negative respectively, whereby the front and rear lens units are simultaneously moved in such a way that the magnifying power of the rear lens unit remains positive when the focal length of the entire system varies.

Zoom lens capable of obtaining focal lengths beyond a variable focal

A photographic lens comprising four lens units, of which the first and second counting from front are of positive power, and the third and fourth have powers of opposite sign to each other, wherein as focusing is performed from infinitely distant object to nearby object, the first three units are axially moved in such differential relation that all the three air separations between the successive two units increase, while the fourth lens unit is held stationary during focusing, thereby the picture quality for the nearby object is greatly improved.

Photographic lens of extended focusing range with improved stability of

A zoom lens having a plurality of lens units with the air separations, at least one of which is varied to effect zooming, the rearmost lens surface of successive two of the lens units and the frontmost lens surface of the rear one being both formed to convex shapes toward the front, whereby when these two lens units axially move at different speeds from each other, a soft-focus effect of varying magnitude is produced on the image.

Zoom lens having a capability of introducing special features into image

A zoom lens whose first lens group, counting from front, has a negative refractive power and moves axially in differential relation to a following lens group to effect zooming, wherein the first lens group is constructed with a lens unit of negative power followed by another lens unit of positive power, whereby for focusing purposes, the negative lens unit is axially moved, while the positive lens unit is held stationary, to improve the stabilization of aberration correction throughout the entire focusing range.

Zoom lens

A zoom lens including, from front to rear, a first lens unit of negative power and a second lens unit of positive power with the separation therebetween being varied to effect zooming. The first lens unit is moved to effect focusing, wherein with the first lens unit focusing a finite object distance on the wide angle side, the second lens unit moves rearward to obtain focal lengths beyond the zooming range.

Growing community of inventors

Yokohama, Japan

Takashi Matsushita