Canon Kabushiki Kaisha

Masatake Kato

Keiji Ikemori

Kazuo Tanaka

Hideo Yokota

Sadahiko Tsuji

Tetsuharu Nishimura

Akihiko Shiraishi

Tsunefumi Tanaka

Makoto Sekita

Kazuo Fujibayashi

Shigeru Hashimoto

Muneharu Sugiura

Kenichi Kawamoto

Sadatoshi Takahashi

Toshiaki Asano

Tokuichi Tsunekawa

Hideki Ogawa

Hiroki Nakayama

Nozomu Kitagishi

Masaharu Suzuki

Jun Hattori

Masaharu Eguchi

Satoru Mizouchi

Shohei Takeda

A camera system has a camera with a photosensitive member that records optical images; and a lens apparatus removably mounted on the camera and forming an optical image with an image taking optical system including a focus lens. Focus control of the focus lens is changed in accordance the photosensitive member. A control circuit controls a lens driving unit and sets a driving pattern in accordance with information stored in a photosensitive member information storage circuit, and controls the lens driving unit based on focus adjustment state detected by a focus detection unit. An in-focus state can be achieved with focus accuracy suited for a photosensitive member in a combination of different cameras provided with different photosensitive members and interchangeable lenses common to these cameras.

Camera system, lens apparatus and camera

A projection optical system for projecting onto a screen an image formed on a display device having a plurality of pixel sets each of which is composed of at least three pixels arranged in correspondence to at least three color light beams of respective different wavelengths. The projection optical system includes a projection lens formed so that lateral chromatic aberration for a color light beam having a wavelength longer than that of a predetermined color light beam has the same sign as that of lateral chromatic aberration for a color light beam having a wavelength shorter than that of the predetermined color light beam.

Projection optical system and projection apparatus

An image processing apparatus and method for inputting image data and coding the image data using inter-frame correlation in which image data of a desired frame out of the image data input is intra-frame coded. The image processing apparatus includes an imaging block, a coding block for coding the image data imaged by the imaging block using inter-frame correlation, a command block for activating still image taking, and a control block for controlling the coding block so that the still image data obtained by the command block is intra-frame coded.

Image processing apparatus and method

A zoom lens has, in succession from the object 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. The second and third lens units are moved to thereby effect zooming. When variations in the magnifications of the second and third lens units from the wide angle end to the telephoto end are Z.sub.2 and Z.sub.3, respectively, the zoom lens satisfies the condition that Z.sub.3 /Z.sub.2 &gt;1.4. The zoom lens is compact and yet covers a wide angle range of an angle of view of 60.degree.-80.degree..

Zoom lens

A device includes a zoom lens having a focusing lens the position of which varies according to a zooming operation, a first moving part arranged to mechanically move the focusing lens according to the zooming operation, and a second moving part arranged to move the focusing lens in such a way as to electrically correct any shift of focus that results from the movement of the focusing lens caused by the first moving part.

A solid-state image sensing device including a plurality of photo cells provided on a substrate and a plurality of micro condenser members each provided on a corresponding photo cell. The interval at which the micro condenser members are arranged at a central portion of the substrate differs from the interval at which the micro condenser members are arranged at a peripheral portion. Further, a center of the micro condenser member and a center of the photo cell may coincide with each other at the central portion of the substrate and may shift from each other at the peripheral portion thereof. Also, a power of the micro condenser members arranged at the central portion of the substrate may differ from a power of the micro condenser members arranged at the peripheral portion thereof. Additionally, the image sensing device may be included in an image taking system with a photo-taking lens which is not telecentric, wherein the solid-state image sensing device receives an object image formed by the photo-taking lens.

Solid-state image sensing device and photo-taking system utilizing

In the disclosed zoom lens three or more zoom components are located on the image side of a stationary component which is stationary during both focusing and zooming. The three or more zoom components are moved during zooming and are provided into a front portion which is moved for focusing, and a rear portion which remains stationary during focusing. The front focusing portion includes at least two components which move together when focusing, but when zooming move relative to each other so as to change the focal length or power of the front portion. This has the advantageous effect of reducing the difference between the amount the front portion needs to move for focusing at the wide angle position and at telephoto position.

Focusing method for zoom lens

An optical low-pass filter formed in a trapezoid wave profile having the top and bottom sides of lengths 'a' and 'b' respectively, a height '.delta.' thereof and a length of one period thereof and made from a material having a refractive index 'n', and satisfying the following conditions: for a wavelength of .lambda..sub.M .gtoreq.1.6 .lambda.m, ##EQU1## wherein .lambda..sub.M and .lambda.m are respectively maximum and minimum wavelengths in a wavelength range in which the filter works, and MIN(x,y) represents the smaller one of values which variables x and y take.

Optical low-pass filter and photographic system using the same

An attachment lens and a camera system, comprising an attachment lens adapted to be attached to the subject side of a camera which is equipped with separate optical openings for the photography system, the finder system, the photometry system, and the colorimetry system. The attachment lens includes an optical element which is on the camera side and which is equipped with a plurality of integrally formed sections facing the optical openings of the camera and having different refractive power configurations, thereby allowing the optical systems to be arranged close to each other.

Camera system and attachment lens with integral lens sections

In an external-measured real image type finder optical system having a prism for a non-reverse erecting image interposed in between an objective lens system and an eyepiece lens system, parallax correction is accomplished by adjusting the position of at least a part of the objective lens system within a plane perpendicular to the optical axis of the finder optical system.

Parallax adjusting mechanism for a finder device

A secondary image forming type finder opitcal device having an objective lens solely used therefor, comprising, from front to rear, an objective lens unit including at least one positive lens, a relay lens unit formed by arranging a lens of positive refractive power and a lens of negative refractive power in spaced relation, a field lens unit consisting of a positive lens whose front surface is of strong curvature, and an eyepiece lens unit consisting of two positive lenses whose confronting surfaces are of strong curvature, satisfying the following conditions: ##EQU1## where f.sub.P is the focal length of the lens of positive refractive power of the relay lens unit, .nu..sub.P is the Abbe number of its material, R.sub.P is the radius of curvature of a lens surface of the lens of positive refractive power of the relay lens unit which is of strong curvature and faces the lens of negative refractive power of the relays lens unit, f.sub.N is the focal length of the lens of negative refractive power of the relay lens unit, .nu..sub.N is the Abbe number of its material, and R.sub.N is the radius of curvature of a lens surfaces of the lens of negative refractive power of the relay lens unit which is of strong curvature and faces the lens of positive refractive power of the relay lens unit.

Finder optical device

For a single lens reflex camera in which an image bearing beam from the photographic objective is reflected by a movable mirror to the finder system, techniques are disclosed that the mirror is made half-reflective, and the transmitted light of the mirror is conducted by a supplementary optical member consisting of, at least, a prism fixedly secured (not movable relative) to the mirror toward an image sensor such as that of a focus detector positioned outside the optical axes of the objective and finder, that the movable mirror is made to take a quite different direction of movement from that to which the reflected beam from the mirror goes, and that as an image pickup device such as CCD is arranged on the optical axis of the objective and behind the movable mirror, the optical characteristics of optical members such as a filter positioned in front of the image pickup device are made equivalent to those of the supplementary optical member.

Single lens reflex camera

A single reflex type electronic camera includes an imaging lens unit and five reflecting units beyond an image formed by an objective, and a finder optical system wherein an image can be observed with a high finder magnification and at a position easy to observe similar to that found in a single reflex camera using silver salt films.

Finder optical system

A compact zoom lens comprising, from front to rear, a first lens unit of positive power for focusing, a second lens unit of negative power axially movable in one direction when zooming from one end of a range of image magnification to the other, a third lens unit of positive power axially movable in a path convex toward the rear to maintain the constant position of an image surface which shifts with zooming, and a fourth lens unit of positive power for forming an image which remains stationary during zooming, wherein a fixed diaphragm is arranged in a space between the second and third lens units.

Compact zoom lens

An image pickup system includes a camera body having an image conversion device and a signal processor and a detachable lens including a memory and circuitry for transmitting the memory contents to the camera body signal processor. In one embodiment, the system provides for storage in the lens memory of the spectral characteristics of both the lens and the image conversion device. In a second embodiment, the system provides for storage of spectral characteristic data concerning a plurality of different lenses in memory in the camera body, with the lenses adapted for self-identification. In a third embodiment, camera body memory stores a single lens spectral characteristic for use in common with any one of plural lenses and representative of all such lenses.

Growing community of inventors

Tokyo, Japan

Masatake Kato