Asahi Kogaku Kogyo Kabushiki Kaisha

Canon Kabushiki Kaisha

Asahi Kogaku Kogyo K.k.

Other

Nec Corporation

Kao Corporation

Seiko Instruments Inc

Asahi Kogaku Kabushiki Kaisha

Noboru Suzuki

Shigeo Toji

Masahiro Kawasaki

Yukio Uenaka

Osamu Shindo

Akira Senda

Shigeo Tohji

Koichi Masuda

Kazumasa Yoshikawa

Ryuji Ohmuro

Setsuo Yoshida

Yuzo Kato

Jun Hosoya

Junichi Kasuya

Takeo Saito

Takaaki Kobayashi

Susumu Fukita

Youji Tanaka

Hiroyuki Matsui

Hiromi Yamamoto

Shuichi Ogawa

Miho Imai

Takashi Uchikawa

Osamu Sugimoto

Hiroyoshi Mizukami

Shinobu Ishizaka

Tetsuo Ohinata

Yasuyuki Yoshida

A lens apparatus includes a magnification variator driven for zooming, a drive unit that drives the variator, a detector that detects the position of the variator, a deriving unit that derives a second drive signal to drive the drive unit based on: an information representing relationship between position of the variator and size of field of view; a position detected by the detector; and first drive signal, wherein field-of-view change rate obtained when the drive unit is driven based on the second drive signal is smaller than field-of-view change rate obtained when the drive unit is driven based on the first drive signal, and a corrector that outputs position data in which variation of speed of the variator is smaller than that of position data based on the second drive command, when the variator is driven based on the second drive command derived by the deriving unit.

Lens apparatus having magnification variator configured to move during magnification varying and image pickup apparatus having the same

A position detecting apparatus includes: a scale having pattern arrays having different cycles of a mover, a sensor detecting phase signals having different cycles based on the scale depending on a position of the mover; a signal processor generating and outputting displacement signals based on the phase signals by switching the displacement signals at a cycle; a detector detecting a speed of the mover based on at least one displacement signal; an absolute calculator deriving the position of the mover based on displacement signals; and a relative calculator deriving a displacement amount with respect to a predetermined position based on a selected displacement signal, wherein the position is calculated by the absolute calculator when the mover moves slow, and when the mover moves fast, the position of the mover is calculated based on an absolute position of the mover obtained in advance and the displacement amount the relative calculator obtained.

Position detecting apparatus, and lens apparatus and optical operating apparatus including the position detecting apparatus

An image-taking control apparatus lets the operations of a plurality of drivable parts, including a first drivable part whose driving speed can be switched only in steps, finish substantially simultaneously. A speed selector selects an operation speed for each of the drivable parts, based on its current position, its target position, and a target operation time. A controller performs lets the operation of the first drivable part start when a waiting time corresponding to a difference between the anticipated operation time for the selected operation speed and the target operation time has passed after a start command time.

Image-taking control apparatus for controlling a plurality of drivable parts of said apparatus such that each drivable part finishes its operation at substantially the same time

A drive controller for a lens apparatus including a first lens unit which moves for changing magnification and a second lens unit which moves to prevent an image plane variation in response to the first lens unit moving to change the magnification. The drive controller includes a memory storing a plurality of tracking data corresponding to position data of the second lens unit, and a control unit for detecting a change in a focus state of the lens apparatus during the movement of the first lens unit and for changing one of the plurality of tracking data based on the detection result. The control unit stores a direction of the changing of the one tracking data and thereafter changes the one tracking data based on the stored direction.

Drive controller for lens apparatus

This invention relates to a system for communicating speed data from a camera to a lens unit to drive the lens unit. Even if speed data changes stepwise, a change amount of the driving speed can be changed within a predetermined range for each stepwise change of the speed data in a whole driving speed change range. An optical apparatus having drive circuit for receiving speed data communicated from the unit which sends the speed data representing speed information and controlling, on the basis of the information, the speed of a moving member which moves within a predetermined range includes a determination circuit for determining a driving speed on the basis of position data, the speed data, and a value representing an actual range of the predetermined range, the position data defining the predetermined range as a predetermined number different from a value indicating the actual range and representing the predetermined number as another value in accordance with a time required to move the moving member within the predetermined range.

Speed control device for optical system

A TV optical lens system is provided which can prevent any problem to be caused by transmission of data not initialized upon a data transmission request from a camera. The system includes a movable optical member, a position detecting unit for detecting a position of the movable optical member as relative information, an initializing unit for performing an initializing operation of moving the optical member to a reference position so as to convert the information detected by the position detecting unit into absolute position information, and a communication unit for communicating with a camera mounted on the photographing lens system, wherein the system is provided with a communication inhibiting unit for inhibiting the communication by the communication unit until the initializing operation is completed.

Optical device for photography

There is disclosed a command-answer type serial communication device between TV lens and TV camera, or between TV lens and accessory. In the command-answer type serial communication, answer data is transferred in response to a command in ordinary communication, but data to be processed at high speed on the side of a device having transferred the command is transmitted to a camera from a lens even if no command is transmitted, so that high-speed communication can be performed.

Image signal recording system and optical device

A decanter type centrifugal separator capable of discharging sludge directly from a portion of the sludge with least moisture content in a bowl so as to lower a moisture content and increase a separation efficiency, wherein a screw conveyor rotated with a difference in speed provided relative to the bowl is stored in the bowl rotated at a high speed, a dewatering cake discharge route ( ) is provided in one end wall ( ) of the bowl, an opening ( ) of the route into the bowl is provided near the inner peripheral wall of the bowl, the discharge route provides a restriction effect to the discharge of the dewatering cake, and a sedimentary layer with thick sedimentation layer is formed near the opening, whereby that portion only of the cake is discharged through the discharge route under head press of the sedimentation layer, that portion receiving the highest consolidation effect by the head press of a centrifugal force acting on the sediment, among the sedimentation layers accumulated at one end of the bowl.

Decanter type centrifugal separator with restriction effected discharge route

This invention provides an image sensing lens device which can communicate independently of the resolution of a position detection means of an optical means in a communication with a camera that pertains to driving control of the optical means. More specifically, the lens device imaginarily divides the movable range using predetermined normalized information more than the minimum required resolution of the optical system, and communicates position information of the optical system between a lens and camera, between a lens and accessory, and the like using the imaginary normalized position information.

Optical device

This invention relates to a driving device for a vibration type motor. According to this invention, maximum speed data of the motor is obtained in accordance with the temperature, and the speed is controlled using the data as an upper limit, thereby properly driving the vibration type motor.

Control device for vibration type motor and apparatus using thereof

The subscriber's busy hour detection system includes the steps of setting a first observation period with respect to each of a plurality of subscribers to be observed and comparing the number of calls of each subscriber stored in a first counter within a specific first time zone in the first observation period with a first threshold value set in advance to select a subscriber whose said number of calls exceeds said first threshold value as a target whose traffic in a second time zone shorter than said first time zone is to be observed, setting a second observation period after said first observation period with respect to each of said plurality of selected subscribers to be observed and comparing the number of calls of each subscriber stored in a second counter within specific said second time zone in the second observation period with a second threshold value set in advance to select a subscriber whose said number of calls exceeds said second threshold value as a target whose traffic in a third time zone shorter than said second time zone is to be observed, and setting a third observation period after said second observation period with respect to each of said plurality of selected subscribers to be observed and storing the number of calls of each subscriber within said third time zone in a third counter.

System and device for detecting subscriber's busy hour

An image magnification control device for a camera having a photographic lens. A distance 'X0' between a rear focal point of said photographic lens and an image taking plane of the camera is detected. Additionally, a defocusing amount 'dx' corresponding to a distance between the image taking plane and a surface on which an image is formed by the photographic lens is detected. A magnification ratio .gamma. of a control focal length 'f1' required to maintain an image magnification to a present focal length 'f0', that is based on the distance 'X0' and the defocus amount 'dx' is then calculated in accordance with a predetermined equation. Thereafter, an amount to drive the photographic lens to maintain the image magnification, based on the magnification ratio .gamma. is calculated, and the photographic lens is driven to change a focal length of the photographic lens.

Image magnification control device for a camera

An image magnification control device for a camera. Control focal length required to maintain an image magnification constant is computed based upon defocus information detected by analyzing a light that passes through a photographic lens. In case a focal length of the photographic lens moves out of a range wherein the set image magnification can be obtained, various options, such as a shutter-release lock operation, can be executed depending upon the chosen design of the camera.

An image magnification control device for a camera having a photographic lens. The image magnification control device includes a first detector that functions to detect a focal length 'f0' of the photographic lens. A distance 'X0' between a rear focal point of the photographic lens and an image taking plane of the camera is then determined based on a delivery-amount of a focusing lens of the photographic lens and the detected focal length 'f0'. A second detector detects a defocusing amount 'dx' by analyzing a light passed through the photographic lens, in which the defocusing amount 'dx' represents a displacement of an image formed by the photographic lens from the image taking plane. An image magnification 'm0' is determined based on a formula 'm0=X0/f0', while a control focal length 'f1' is calculated based on a formula 'f1=(f).sup.2 .multidot.m0)/(X0+dx)'. The focal length of the photographic lens is thus controlled so as to meet the control focal length 'f1'.

Growing community of inventors

Tokyo, Japan

Noboru Suzuki