Canon Kabushiki Kaisha

Takashi Itani

Hiroyuki Takimoto

Akira Ashida

Masaya Maeda

Kiyoshi Takahashi

Kuniyoshi Suzaki

Tateo Yamada

Takashi Narasawa

Susumu Kozuki

Hiroshi Watanabe

Hiroo Edakubo

Masahide Hasegawa

Tatsuzo Ushiro

Takashi Yamada

Kuniyoshi Suzuki

Kiyoshi Takasashi

Moving elements in a recording and/or reproduction apparatus change the travel path of a strip-like recording medium mounted in a container. A detector detects a specified part of parts of the medium having a character different from other parts of the medium and at least part of a light emitting and/or light receiving arrangement of the detector moves into and out of the space required for altering the path of the medium.

Recording or reproducing apparatus using container mounted strip-like

A color video camera includes an image pick-up device for converting images into electrical signals including a plurality of color signal elements, white picture forming circuitry for introducing a white picture to the image pick-up device and a white balance control for controlling a proportion of each color signal element contained in an output of the image pick-up device so as to have a prescribed ratio. A power source switch is included for supplying current to individual circuits in the video camera. The camera also includes an operation member having three positions. The member turns off the power source switch in a first position; it turns on the switch in a second position to control the white picture forming circuitry and introduces the white picture to the image pick-up device, thereby actuating the white balance control; in a third position it turns on the power source switch to control the white picture forming circuitry so as to prevent introduction of the white picture to the image pick-up device. The second position is located between the first and third positions.

Color video camera

A recording and/or reproducing device arranged to use a cassette containing a recording medium such as a tape, includes a tape loading mechanism operative to displace the tape contained in the cassette to a position at which the tape is in operative relation to a recording head. A cassette displacing arrangement into which the cassette is first loaded is movable to a position where the cassette is in operative relation to the tape loading mechanism. A member on the displacing arrangement serves to hold the cassette at a certain position relative to the displacing arrangement so that the cassette will be moved into operative relation with the tape loading mechanism by the displacing arrangement.

Recording and/or reproducing device making use of a cassette

White balance control for color video camera

A tape cassette and a video recording and reproducing system using the same are disclosed. This system provides an increase in the recording capacity of video signals despite the reduction of volume of a tape within the cassette and the resultant reduction in the bulk and size of the cassette and can be loaded with the tape cassette on selection of two conditions. The tape cassette will be turned upside down after the video signals have been recorded on either one of the upper and lower halves of the width of the tape.

Tape cassette and video recording and reproducing system using the same

A sound motion picture projection system which can be formed by a combination of a silent film projector and a sound recording and reproducing unit, wherein a silent film projector and a separate sound recording and reproducing unit are provided and minor modification is given to said silent film projector so that said silent film projector can be used as a projection unit only with said minor modification. And especially in this system when said sound unit is attached to said projection unit and continuous film advancing means provided at said sound unit is connected with a driving motor provided at said projection unit through a power transmission mechanism, and at a same time an intermittent film advancing means provided at a projection unit is connected with a part of said power transmission mechanism through a power transmission mechanism of variable speed type, further an output member of a loop sensing means provided at the sound unit is connected with said variable speed power transmission mechanism, so that an operating speed of the intermittent film advancing means at the projection unit is controlled depending on the change in an amount of film loop formed between a projection station of the projection unit and a sound recording and a reproducing station of the sound unit.

Sound motion picture projection system

Disclosed is a sound motion picture projection apparatus in which a head pad is urged by a spring member toward a film pressing position at which position the head pad presses a film against a magnetic head disposed along the sound recording and reproducing film path. The apparatus has a set mechanism of the self-holding type which sets the head pad against the urging force of the spring member to a film pressure releasing position at which position the head pad releases the pressing of the film, by the driving force of a driving motor and keeps the head pad to that position. The apparatus further has a film detecting member which is disposed in said sound film path after the magnetic head and operatively connected with the set mechanism in such a manner that the holding of the head pad at the film pressure releasing position by means of the set mechanism is released when the film detecting member detects the film introduced into the sound film path and thereafter the setting operation of the set mechanism is made ineffective as long as the film detecting member detects that a film exists in the sound film path. Thereby when the set mechanism is driven by the driving motor when no film exists at least in the sound film path, the head pad is automatically set to the film pressure releasing position and then the head pad is automatically changed from the film pressure releasing position to the film pressing position when the film detecting member detects the introduction of the film into the sound film path.

Sound motion picture projection apparatus

The present invention relates to a lens unit construction for motion picture and other type projectors. The unit is provided with a motion picture projecting lens construction, a mantle cover to be fixed on the fixing position of the motion picture projector body, a guide device for slidingly guiding and holding the lens construction holding device on the device plate in such a manner that the construction holding device is slidable only along the direction of the optical axis of the lens construction and an adjusting device for operating the slide motion of the construction holding device. The construction holding device or the adjusting device is provided with a cam follower pin while the other is provided with a focus adjusting cam groove in which the cam follower pin is engaged. An engaging device guides the cam follower pin so that it can be easily introduced into the cam groove at the time of assembling the construction holding device with the adjusting device to form one body and for preventing the cam follower pin from being easily brought out of the cam groove in such a manner that the construction holding device is cooperatively coupled with the adjusting device.

Lens unit for motion picture projector and others

A sound motion picture projection apparatus provided with pressure pad means operable to press a film against magnetic sound recording and reproducing head means disposed along a path of the film for sound recording and/or reproduction. Urging means urge the pressure pad means toward its film pressing position. Externally operable means are provided for shifting the pressure pad means from its film pressing position to a released position against the urging force of the urging means. Releasable locking means are provided for holding the pressure pad means in the released position against the urging force of the urging means; and film detecting means are disposed in said sound film path behind the magnetic head means to detect introduction of the film into the sound film path and to release the locking of the pressure pad means by the locking means. Thereby, when film introduction into the film path for sound recording and/or reproduction is detected by the film detecting means, the pressure pad means is automatically changed from the released position to the film pressing position.

The present invention relates to a cine-projector so designed as to carry out the motion picture projection, the still picture projection, the quick film feeding as well as winding up by simultaneously controling the first clutch mechanism for selectively interrupting the engagement of the driving ower transmission mechanism with the feeding shaft rotated by means of the driving power of a motor rotating along a single direction through the driving power transmission mechanism by means of the translation mechanism to be translated at least into three positions in functional engagement with the operation mode change over mechanism for changing over the operation mode of the cine-projector, the second clutch mechanism for selectively interrupting the engagement of the driving power transmission mechanism with the winding up shaft rotated along the inversed direction as that of the above mentioned feeding shaft by means of the driving power of the above mentioned motor through the driving power transmission mechanism, the first control mechanism for controling the efficiency of the mechanism for intermittently feeding the film at the projection part and the second control mechanism for controling the binding mechanism for semi-compulsorily binding the film at the projecton part.

Cine-projector

A motion picture projector having various functions such as, projecting and rewinding, all of which can be selectively performed by a single control knob, and including an intermittent-drive film advancing mechanism which comprises a pull-down structure, a compound cam of an up-and-down cam wheel and an in-and-out cam disk, and first and second cam followers arranged between the pull-down structure and the compound cam to be consecutively operated so that the pull-down claw enters the perforations of the film and moves it in a forward direction always by the length of a frame and at a desired frequency through a film gate mechanism. The film gate mechanism consists of a film guideway, a resilient thin aperture plate self-biased to move away from the film guideway and defining an actual projection aperture, and a movable film gate member arranged on the opposite side of the aperture plate from the guideway and biased to urge the aperture plate for guidance and support of the film against the guideway. The pull-down structure and the film gate member have respective input means arranged to be consecutively actuable by a common mode changeover means cooperative with the control knob. The mode changeover means has at least three switched positions, that is, a first position for a normal projecting operation, a second position where the pull-down structure is maintained disengaged from the in-and-out cam follower to project a still picture, and a third position where the film gate member and the aperture plate are spaced from the film guideway to permit continuous transportation of the film at a far faster speed than that occurring in the normal projecting mode of operation.

Motion picture projector

The present invention relates to a synchronization system of a cine-projector with a sound tape reproducer. It is characterized in that the phase of a signal corresponding to the film feeding speed of the film projector and that of a signal corresponding to the standard speed coming from the sound tape reproducer are compared with each other so as to control the film feeding speed of the cine-projector by means of the comparison output corresponding to the phase difference. In order to accomplish this, between the driving source for driving the internal mechanism of the cine-projector and the driving member for the internal mechanism, a transmission speed varying mechanism is provided in such a manner that the transmission speed varying mechanism is controlled by means of the film speed control driving source to be driven by the comparison output so as to maintain the synchronized state.

Growing community of inventors

Yokohama, Japan

Takashi Itani