Abstract: A dc rejection circuit is provided between each output of a diode matrix circuit and a corresponding segment electrode in a liquid crystal display panel. The dc rejection circuit may comprise a very simple structure comprising a combination of a resistor and a capacitor thereby providing a liquid crystal display device which is inexpensive and yet ensuring a long service life.

Abstract: A radio receiver has an antenna casing provided separately of the chassis and printed circuit board of the receiver and housing a rod-like antenna. The antenna casing has a stem portion rotatably and slidably extending through a bearing portion formed in the cabinet of the receiver to mount the antenna casing rotatably on the cabinet whereby the antenna may be oriented in a direction at which a desired radio wave is received best regardless of the orientation of the receiver relative to the radio wave.

Abstract: An automatic music playing system including a matrix circuit and manual play switches both connected to tone signal generators, each of said manual play switches consisting of a series connection of a resistor and a switch and a capacitor connected between the interconnection of said resistor and switch and the input terminal of a corresponding tone signal generator so that the output signals of said matrix circuit is absorbed in said capacitor when said switch is closed and an on-off switch operation triggers the corresponding tone signal generator, and each of said tone signal generators including two oscillating transistors connected with a feed-back loop and provided with a damping resistor.

Abstract: An acousto-optic filter utilizing the far-off-axis anisotropic Bragg diffraction comprising an optically anisotropic acousto-optic medium embodied by a paratellurite crystal. An ultrasonic wave generated by a transducer is propagated in a direction different from that of the wave front normal to make the light-sound interaction length in the medium elongate by slanting the bonding surface of the transducer to the crystal medium.

Abstract: A magnetic recording and reproducing apparatus having a cassette tape comprises head base controlling mechanism, and holding case and provides the following three functions: keeping a tape in contact with a recording and reproducing head and an erasing head to such a degree as not to cause trouble for detecting or erasing the recorded content during fast forwarding or rewinding speed of a tape by the reproducing or erasing head, making it possible to record and reproduce at a constant forwarding speed by advancing the head within the cassette, and also making it possible to mount or demount the cassette by completely withdrawing the head advanced within the cassette therefrom.

Abstract: An acousto-optic filter utilizing the far-off-axis anisotropic Bragg diffraction comprising an optically anisotropic acousto-optic medium embodied by paratellurite. The light entrance surface is slanted to the crystalline axis to make a light beam incident perpendicularly to the surface. The light exit surface is slanted to the direction of the entrance surface to minimize the dispersion of diffracted angle due to light wave length.

Abstract: In a television receiver, a video signal for a single frame at any moment is stored in a storage tube. The stored video signal is displayed, if necessary, as a still picture on a part of the picture tube screen together with the ordinary broadcasted television picture in motion.

Abstract: A photoelectric punched card reading device adapted to insert the punched card by hand, for reading the punched card photoelectrically in a static state comprising a matrix of light sensors each adapted to be in register with a hole in a punched card, an aperture mask in close contact with the light sensor matrix a card loading section having, a punched card insertion slot for holding a punched card in correct position with respect to the light sensor matrix and aperture mask, and a light source for uniformly illuminating the light sensor matrix, wherein the card loading section, the light sensor matrix and the light source are assembled integrally.

Abstract: A microwave oven having a defrosting means including a bidirectional thyristor provided in a power source circuit and a control circuit for on-off controlling the thyristor, whereby microwave radiation can be intermittently irradiated on the foodstuff to obtain effective defrosting. Also, surge current at the time of start and end of the microwave oscillation is prevented.

Abstract: An apparatus in which a luminance signal is recorded onto a first storage tube, the two chrominance signals are compressed to one-half, respectively, in time axis to record alternately such compressed chrominance signals onto a second storage tube, and the signals are repeatedly read out from the first and second storage tubes in order to reproduce the colored still picture image, thereby reproducing the picture image without deteriorating resolution and setting up the apparatus to be free from trouble.

Abstract: A cooking utensil provided with a device for selecting a rotational speed of the cooking utensil such as a mixer, a device for selecting a processing time thereof and an indicating device therefor in which when one of the names of food marked upon the indicating device is selected, a rotational speed or processing time for optimum processing of ingredients of a selected food may be automatically set.