Patents by Inventor Akira Ishizaki
Akira Ishizaki has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 4800410Abstract: A focus detecting apparatus in which light distributions having their relative positional relation varying in conformity with the focus adjusted state of an objective optical system and based on an object are received by a light-receiving device having a plurality of picture elements and the output signal of the light-receiving device is operated in two different processes, and an evaluated values dependent on the contrast is operated in each of the processes and the evaluated values are compared with each other, and the result calculated in the process of better contrast is adopted as a value indicative of the focus adjusted state of the objective optical system.Type: GrantFiled: July 7, 1987Date of Patent: January 24, 1989Assignee: Canon Kabushiki KaishaInventors: Akira Akashi, Akira Ishizaki, Yasuo Suda, Ichiro Ohnuki, Keiji Ohtaka, Takeshi Koyama
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Patent number: 4792669Abstract: A focus detecting device which is provided with a field lens disposed on the predetermined imaging plane of an objective lens and a plurality of imaging lenses disposed rearwardly of the field lens and in which the images of the imaging lenses are sensed to thereby determine the focus adjusted state of the objective lens. A unit body integrally constitutes the units such as the field lens and the imaging lenses and has a surface for movably supporting the field lens. The unit body also has adjusting device for rotating the imaging lenses relative to the optical axis.Type: GrantFiled: December 30, 1986Date of Patent: December 20, 1988Assignee: Canon Kabushiki KaishaInventors: Ichiro Ohnuki, Yasuo Suda, Akira Ishizaki, Akira Akashi, Keiji Ohtaka, Takeshi Koyama
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Patent number: 4792668Abstract: An apparatus for detecting a focusing state of an objective lens comprises optical means for forming light intensity distributions of object images whose relative positional relationship changes with the focusing state of the objective lens, sensing means having a plurality of sensors for sensing the light intensity distributions to produce first and second signals relating to the light intensity distributions, signal processing means for relatively displacing the first and second signals by determining correlation information and producing a signal for adjusting the focusing state of the objective lens in accordance with the correlation information, and altering means for altering a displacement range within which the first and second signals are relatively displaced.Type: GrantFiled: December 2, 1986Date of Patent: December 20, 1988Assignee: Canon Kabushiki KaishaInventors: Akira Akashi, Akira Ishizaki, Yasuo Suda, Ichiro Ohnuki, Keiji Ohtaka, Takeshi Koyama
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Patent number: 4790649Abstract: The invention relates to an automatic focusing apparatus, particularly, of a type wherein a lens drive amount is calculated by circuits in a camera in accordance with an output from a focusing detection circuit, the calculation result is transmitted to a lens mounted on the camera, and the lens is driven accordingly. While the lens unit is driven for a distance corresponding to the calculation result, operation of the focusing detection circuit of the camera is prohibited by sending a signal for prohibiting the operation of the focusing detection circuit thereto through a contact for transferring data from the camera to the lens unit in modes other than the lens drive mode. The number of contacts between the camera and the lens unit is reduced.Type: GrantFiled: January 2, 1985Date of Patent: December 13, 1988Assignee: Canon Kabushiki KaishaInventors: Yoshihito Harada, Akira Ishizaki
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Patent number: 4787141Abstract: An automatic assembly apparatus for fastening a part to a workpiece includes a pair of T-shaped legs, each having a horizontal guide thereon, mounted on a base in alignment with and spaced from each other in the direction of the path of the workpiece while the horizontal guide on each of the T-shaped legs extends at right angles to and intersects the path of the workpiece. A horizontal orthogonal coordinate type robot is mounted on the horizontal guides to move in the direction of the path of the workpiece while being simultaneously movable at right angles to and intersecting the path of the workpiece. A conveyor jig is mounted on each of the vertical structures between the base and the T-shaped legs.Type: GrantFiled: June 19, 1987Date of Patent: November 29, 1988Assignee: Toyota Jidosha Kabushiki KaishaInventors: Hiroshi Miyazaki, Takao Miyatani, Akira Ishizaki
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Patent number: 4777506Abstract: A camera having an assembling adjusting device comprises a casing for a camera body, a photo-sensor disposed in the casing to receive an object image, a relay optical system for relaying a light beam from the object, a holder arranged in the casing to hold the relay optical system, a photo-sensor array for producing a focus detection signal in response to a focusing light from the relay optical system, a package for accommodating the photo-sensor array, a coupler for coupling the package to the holder, and compensation means for adjusting an attitude of the package to the holder to compensate for an inclination of the photo-sensor array plane to the focusing light.Type: GrantFiled: July 27, 1987Date of Patent: October 11, 1988Assignee: Canon Kabushiki KaishaInventors: Akira Hiramatsu, Akira Ishizaki, Keiji Ohtaka, Akira Akashi, Yasuo Suda
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Patent number: 4760418Abstract: A flash photographing system which comprises a camera equipped with an AF device and a flash device is arranged to control the flashing light quantity of the flash device by utilizing the AF sensor of the AF device in a flash photographing mode.Type: GrantFiled: September 15, 1986Date of Patent: July 26, 1988Assignee: Canon Kabushiki KaishaInventors: Akira Ishizaki, Yasuo Suda
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Patent number: 4745426Abstract: A light measuring apparatus for an exposure control for a camera including a photoelectric converter which photoelectrically converts a portion of a light beam impinging on a photoelectric conversion portion of a focus detection device, through a taking lens. The remainder of the light beam is transmitted into the optical path of the light beam so that light measuring for an exposure control is performed from the bundle of light proceeding toward the focus detection device.Type: GrantFiled: September 30, 1986Date of Patent: May 17, 1988Assignee: Canon Kabushiki KaishaInventors: Yasuo Suda, Akira Ishizaki
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Patent number: 4739157Abstract: A correlation detecting method in which in order to detect the correlation between a pair of electrical signal trains which should effect a correlation operation, the operation is effected while the relative position of the signal trains is shifted and during the operation, the signal levels of at least the opposite ends of each signal train are reduced relative to the signals at a central position of the signal train, thereby mitigating the correlation error attributable to the signals near the ends of the signal trains.Type: GrantFiled: March 17, 1986Date of Patent: April 19, 1988Assignee: Canon Kabushiki KaishaInventors: Akira Akashi, Akira Ishizaki, Yasuo Suda, Keiji Ohtaka, Hiroshi Ohmura
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Patent number: 4728785Abstract: An adjusting screw for adjusting the inclination of a sensor unit body including sensing means for producing the information about the focus adjusted state on the basis of a light beam from an objective lens is moved with the sensor unit body perpendicularly to the optic axis of the objective lens, whereby adjustment of the optic axis of the objective lens is accomplished. At least two adjusting means are provided for inclining the sensing means itself at a predetermined angle with respect to the optic axis.Type: GrantFiled: December 30, 1986Date of Patent: March 1, 1988Assignee: Canon Kabushiki KaishaInventors: Ichiro Ohnuki, Yasuo Suda, Akira Ishizaki, Akira Akashi, Keiji Ohtaka, Takeshi Koyama
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Patent number: 4716282Abstract: A method and apparatus for detecting the focus state of an object image pattern in accordance with a plurality of photo-electrically converted output signals, including a first mode in which the plurality of photo-electrically converted output signals are sampled at different times and statistically processed for each output, wherein the focus state is detected in accordance with the statistically processed outputs, and a second mode for detecting the focus state without the statistical processing.Type: GrantFiled: August 9, 1985Date of Patent: December 29, 1987Assignee: Canon Kabushiki KaishaInventors: Akira Akashi, Hiroshi Ohmura, Akira Ishizaki, Keiji Ohtaka, Yasuo Suda
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Patent number: 4714332Abstract: A film data reading device is provided with contacts for reading a data relative to a film from a data code part provided on a film cartridge. The contacts are arranged to be protrusible into and retractable from a cartridge loading chamber and to be retracted from the cartridge chamber when loading the chamber with the film cartridge.Type: GrantFiled: October 3, 1985Date of Patent: December 22, 1987Assignee: Canon Kabushiki KaishaInventors: Masaharu Eguchi, Yoichi Tosaka, Ichiro Ohnuki, Yoshihiko Aihara, Akira Ishizaki
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Patent number: 4701626Abstract: There is disclosed a device for correcting the accumulation time of a photoelectric converter composed of self-scanning charge-accumulation elements of plural bits on the basis of the average intensity to the incident light to the converter. The charge accumulation time is controlled by determining a reference value according to the maximum value of the output signals obtained from the photoelectric converter and comparing this reference value with the average intensity.Type: GrantFiled: September 24, 1984Date of Patent: October 20, 1987Assignee: Canon Kabushiki KaishaInventors: Akira Ishizaki, Kazuhiko Arakawa
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Patent number: 4698492Abstract: A focus detection system includes an object lens for focusing an image of an object, a refocusing optical system for refocusing a plurality of component image having parallax from the image of the image, a view field mask arranged between the object lens and the refocusing optical system and having a laterally extending aperture, and a sensing device having a photo-sensor array for sensing the component images. Focus detection error is prevented by determining a sense area of the photo-sensor array in accordance with a distortion created in an aperture image by the refocusing optical system.Type: GrantFiled: June 27, 1985Date of Patent: October 6, 1987Assignee: Canon Kabushiki KaishaInventors: Keiji Ohtaka, Akira Hiramatsu, Yasuo Suda, Akira Akashi, Akira Ishizaki
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Patent number: 4688920Abstract: A system for detecting the focus of an imaging lens relative to an object includes re-imaging means disposed on the imaging side of the imaging lens and having pupil dividing means for dividing the pupil of the imaging lens into a plurality of areas, the re-imaging means forming a secondary object image of the object from a light beam passed through the plurality of divided areas, an optical system disposed near the predetermined imaging plane of the imaging lens and having a reflecting surface for directing a primary object image of the object to the re-imaging means, and light-receiving means on which the secondary object image by the re-imaging means is formed.Type: GrantFiled: September 20, 1985Date of Patent: August 25, 1987Assignee: Canon Kabushiki KaishaInventors: Yasuo Suda, Hiroshi Ohmura, Akira Ishizaki, Akira Akashi, Keiji Ohtaka
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Patent number: 4670645Abstract: This specification discloses a focus detecting system in which a plurality of images are formed on the basis of light beams passing through different portions of the pupil of an objective lens and the focus state of the objective lens is detected from the relative positional relation of these images and wherein filters of which the density distribution varies along the direction of arrangement of photoelectric conversion elements are disposed in front of photoelectric conversion element arrays for detecting the distributions of quantity of light of the images, thereby accomplishing shading correction.Type: GrantFiled: October 11, 1984Date of Patent: June 2, 1987Assignee: Canon Kabushiki KaishaInventors: Keiji Ohtaka, Akira Akashi, Akira Ishizaki, Yasuo Suda, Akira Hiramatsu
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Patent number: 4643557Abstract: This is disclosed an exposure control device capable of controlling an exposure by using a CCD etc. sensor in which CCD sensor is also used for detecting a focus state of an imaging lens of camera or the like.Type: GrantFiled: September 23, 1985Date of Patent: February 17, 1987Assignee: Canon Kabushiki KaishaInventors: Akira Ishizaki, Akira Akashi, Keiji Ohtaka, Yasuo Suda, Akira Hiramatsu
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Patent number: 4634255Abstract: A focus detection apparatus has a field lens on or in a vicinity of an anticipated focal plane of an imaging lens and a refocusing optical system arranged behind the field lens to focus light beams transmitted through different areas in a pupil of the imaging lens onto a photo-sensor array to form a secondary image thereon, and detects a focus in accordance with an output signal of the photo-sensor array. A filter which blocks an infrared ray and transmits a visible ray is arranged adjacent to the field lens to prevent degradation of a filtering characteristic which depends on an inclination of a main light impinging to the filter.Type: GrantFiled: June 6, 1985Date of Patent: January 6, 1987Assignee: Canon Kabushiki KaishaInventors: Yasuo Suda, Akira Ishizaki, Keiji Ohtaka, Akira Akashi, Akira Hiramatsu
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Patent number: 4618236Abstract: In an apparatus wherein on the basis of a light passing through an objective lens, a plurality of images whose relative positional relation varies in accordance with the focus state of the objective lens are formed and these images are detected by photoelectric conversion element arrays and a predetermined operation is effected by the use of a plurality of photoelectrically converted signals obtained correspondingly to the respective images to thereby detect the focus state of the objective lens, there are provided first adder means for comparing the photoelectrically converted signals of the respective images in a predetermined relation and adding the smaller signal and second adder means for comparing the photoelectrically connected signals of the respective images in a predetermined relation and adding the greater signal and focus detection is effected by utilization of the result of the addition of one of the first and second adder means in accordance with the object condition, whereby accurate focus deteType: GrantFiled: November 2, 1984Date of Patent: October 21, 1986Assignee: Canon Kabushiki KaishaInventors: Akira Akashi, Akira Ishizaki, Akira Hiramatsu, Yasuo Suda, Keiji Ohtaka
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Patent number: 4614418Abstract: A distance detection apparatus detects distances to a far object and a near object in a view field, weights the detected distance information, and selects the distance information on the near object to finally detect the distance.Type: GrantFiled: July 30, 1984Date of Patent: September 30, 1986Assignee: Canon Kabushiki KaishaInventors: Akira Ishizaki, Takashi Kawabata, Susumu Matsumura