Canon Kabushiki Kaisha

Hiroyoshi Misumi

Shigeo Yamagata

Kunio Tsuruno

Kenichi Nagasawa

Hiroyuki Horii

Yoichi Yamagishi

Makoto Takayama

Noriyoshi Chizawa

Saburou Nakazato

Yoshirou Udagawa

Ryousuke Miyamoto

The present invention relates to an apparatus for driving a stepping motor, including a plurality of push-pull circuits each of which is capable of controlling a push state in which a current is supplied to a terminal and a pull state in which a current is drawn through the terminal and which are connected to coils to operate the stepping motor utilizing the bipolar driving. In the apparatus of the present invention, at least one of the push-pull circuits is connected to a common terminal having one ends of the coils of different phases connected thereto, thereby reducing the number of circuits and driving lines.

Apparatus and method for driving a stepping motor

A motor driving control apparatus for driving a motor repeats alternately the supply of current to the motor coil during the exciting period and the non-supply of current to the motor coil during the non-exciting period. For this apparatus, a short period is set to enable each of the feeding points of the motor coil to be short-circuited totally during the non-exciting period, and an open period is set to enable each of the feeding points to be totally in the open status during the open period.

Motor driving control apparatus

In a motor drive control apparatus, without using a current control circuit, a gate circuit, and a minus power supply, a short period (a period in which either one of Nch and Pch FETs is turned on without supplying currents from the FET elements to coils of a motor at the same time at electrical power supply points) is provided between one cycle of duty control of the FET elements and the next cycle, and a total current flowing to the motor is controlled by controlling a width of the period.

Motor drive control apparatus

An erasing apparatus in which an erase standby mode is set before executing an erase operation. Circuitry is provided for measuring an elapsed time of the erase standby mode during which the erasing operation is not executed. Circuitry is provided for automatically releasing the erase standby node in accordance with a measuring result of the measuring circuitry.

Erasing apparatus having a timer to release the erase standby mode

The present invention is intended to solve a problem which may be encountered during a transfer from a mode for searching a desired still image to a mode for performing actual reproduction during the process in which still image information is reproduced from a tape-shaped recording medium on which a multiplicity of helical tracks are formed for one picture of still image information, one picture of still image information and address information indicative of the number thereof being recorded in the multiplicity of helical tracks. The sensation of an operator can be made coincident with an actually reproduced still image, for example, by effecting such mode transfer by detecting and using a number adjacent to a desired still image number or by shifting the tape-shaped recording medium by a predetermined amount. Accordingly, it is possible to to search a desired still image rapidly and easily.

Still image reproducing apparatus

Apparatus and method for recording and/or reproducing an image frame in plural blocks utilizes a memory for storing an image signal for one field. The image signal for one field is then divided into n blocks by reading the image signal from the memory n times where n is an integer equal to at least two. The n divided image signals are then subjected to one-channel signal processing, and the respective image signals subjected to the signal processing are then recorded on a recording medium sequentially in different tracks. During reproduction, if little time is available, only selected ones of the n blocks are read and the entire image is interpolated therefrom.

Recording and/or reproducing apparatus

According to one aspect of this invention, auxiliary data recorded on a recording medium together with image and/or sound data is reproduced by a plurality of times, and if the auxiliary data reproduced from a predetermined range on the recording medium coincide with each other, it is determined that the auxiliary data reproduced from the predetermined range is true auxiliary data which can be utilized. According to another aspect of the invention, auxiliary data recorded in different areas on a recording medium are repeatedly reproduced, and if the auxiliary data repeatedly reproduced from all areas do not coincide with each other by predetermined times, it is determined whether the auxiliary data repeatedly reproduced from a particular range coincide with each other by predetermined times. If such auxiliary data coincide, it is determined that the auxiliary data reproduced from the particular range is true auxiliary data which can be utilized.

Reproducing apparatus and reproducing method

A head driving device includes a head driving mechanism which is arranged to shift, relative to a recording track formed on a recording medium, a head stepwise in units of a predetermined driving extent, a detection circuit which detects the level of a signal reproduced by the head, and a control circuit which controls the head driving mechanism to have the head shifted in the direction of obtaining the maximum output of the detection circuit. When the head shifting direction is reversed, the control circuit causes the head to be shifted in the reverse direction at least by two steps in units of the driving extent and determines the stopping position of the head on the basis of the output of the detection circuit obtained at each of head positions obtained at each step of shifting the head in the reverse direction.

Stepper motor head driving device accounting for hysteresis error

A reproduction apparatus provided with a reproduction head for reproducing information modulated in different frequency bands and recorded in different areas of a medium includes; a circuit for demodulating the output of the reproduction head with a characteristic corresponding to the frequency bands, a changing device for changing the track to be reproduced by the reproduction head, and control means for not varying the characteristic of the demodulating circuit during the changing operation.

Reproduction apparatus for reproducing successive image signals of

An image processing apparatus includes a reproducing device for reproducing recorded image data from a medium on which a plurality of image data are recorded. Apparatus is provided for supplying to a monitor the reproduced image data as a multi-screen wherein one screen of the monitor displays a plurality of smaller screens each corresponding to a respective one of the plurality of image data. Structure is provided for designating at least one of the smaller screens displayed on the multi-screen, and circuitry is provided for erasing from the medium image data corresponding to one of the smaller screens designated by the designating structure.

Growing community of inventors

Kanagawa, Japan

Hiroyoshi Misumi