Abstract: A rotary head device for a rotary head-type magnetic recording/reproducing apparatus comprising a fixed drum and a rotary member which has a magnetic head disposed therein is provided with a ball bearing which is formed by inserting a plurality of rolling members into annular grooves which are respectively formed in the fixed drum and the rotary member on their opposed sides and are located adjacently to their peripheries.

Abstract: An adapter permits mounting of a large cassette on a information recording and/or reproducing apparatus adapted for recording or reproducing records on a strip like recording medium contained in a small cassette mounted on the apparatus, so that both small and large cassettes can be used on the apparatus with the adapter mounted thereon.

Abstract: A picture recording apparatus having an image pick up means, in which the drive of a picture signal recording medium is effected by means of a driving power producing means for producing the driving power for moving at least a part of the photographing lens included in the image pick up means.

Abstract: A video camera having an image tube and a detector for detecting the operation state of the image tube. The light intensity from an object to the image tube is controlled in accordance with the output signal from said detector.

Abstract: A rotary magnetic head drum assembly which is formed smaller, thinner and yet is adapted to operate accurately and wherein, without employing a rotatable spindle for a rotary head drum, the drum is directly and rotatably supported on a stationary drum provided under the head drum, through bearings provided at its peripheral groove. A rotary transformer is disposed between the outer side face of the rotary head drum and the inner side face of the stationary drum to transmit video signals from the rotary magnetic heads to the outer circuitry or vice versa.

Abstract: This specification discloses a lens unit for a video camera which is provided with an image pickup lens, an automatic focus adjusting device for automatically focusing the image pickup lens onto an object, an automatic diaphragm device, connection means for connecting the automatic focus adjusting device to a power supply circuit on the camera body side, and connection means for connecting the automatic diaphragm device to a photometry signal (luminance signal) putting-out circuit on the camera body side.

Abstract: A video camera for use in combination with a video recorder and having an automatic focusing device for automatically focusing a picture-taking lens to an object, trigger means to be manually actuated from outside, and a recorder trigger circuit means receiving a signal indicating the completion of focusing of the lens supplied from the automatic focusing device and a signal indicating the actuation of the trigger means and adapted to release a recording start signal to the video recorder in response to the actuation of the trigger means and to the completion of the focusing of the picture-taking lens.

Abstract: A video camera disclosed herein is used with video recorders, said camera being provided with first and second trigger switches which are manually operated in succession, said camera further including an image pick-up tube having a heater circuit therefor which is energized when the camera is operatively connected with a video recorder or when a power switch in the video recorder is turned on in the connection of said video recorder with said camera or when a recording switch is further turned on after said power switch has been turned on, said camera further including other circuits which are energized by turning on said first trigger switch, said camera being adapted to generate a recording start signal for the video recorder when said second trigger switch is turned on.