Ricoh Company, Ltd.

Sony Corporation

Keiji Enomoto

Takashi Shimamura

A waterproof case for containing a camera includes a case body configured such that the camera is freely inserted therein and removed therefrom, and an optical system arranged at a part of the case body where a photographic lens of the camera faces. The optical system serves as a conversion lens for the photographic lens.

Waterproof case for camera

When rotational force of a zooming motor is transmitted to a driving gear, a main moving frame in a lens body tube is moved along an optical axis while the main moving frame is rotated. Thus, a moved frame is moved along the optical axis and a cam frame is rotated while the cam frame is moved along the optical axis. While a zooming optical system is moved from a wide angle position to a storing position, a moving frame for a second lens group is rotated by rotational force of the cam frame while the moving frame for the second lens group is moved along the optical axis. Further, a moving frame for a third lens group is moved along the optical axis while no moving frame for the third lens group is rotated. A converter lens is inserted into an optical path of an effective light beam from an escaping position by a relative rotating operation of these two moving frames. Accordingly, it is possible to provide an optical system having a super short focal length which cannot be obtained within a zooming region. When the cam frame is further rotated in the same direction, the lens body tube attains a storing state providing a shortest body tube length.

Lens body tube with built-in converter lens

The present invention is directed to a television receiver in which, even when a broadcasting of a broadcasting station received and reproduced at an image display unit is ended and a non-signal state is presented, a video signal can be protected from being disturbed. This television receiver comprises a first video signal receiving apparatus, a second video signal receiving apparatus, an image display unit supplied with an output video signal from the first video signal receiving apparatus, and a circuit for supplying an output video signal of the second video signal receiving apparatus as an external output, wherein when the output video signal of the first video signal receiving apparatus is set in the non-signal state, the output video signal of the second video signal receiving apparatus is automatically supplied to the image display unit.

Television receiver with multiple inputs and outputs for automatically

A variable focus lens barrel in which a variable power drive frame has a plurality of cam grooves which each receive a cam pin provided on each of movable frames to which a lens group is each fixed, the variable power drive frame being driven by a motor to perform variable power drive, wherein a balanced groove is formed at each of both ends of a variable power drive range of each of the cam grooves formed in the variable power drive frame such that the balanced groove extends circumferentially of the variable power drive frame over a predetermined angular range from each end, and wherein each of the movable frames does not move in the direction of the optical axis in a rotational area of the variable power drive frame in which each of cam pins slides in the corresponding balanced groove.

Growing community of inventors

Tokyo, Japan

Keiji Enomoto