Victor Company of Japan, Limited

Koichiro Motoyama

Shintaro Nakagaki

Itsuo Takanashi

Kenichi Miyazaki

Tadayoshi Miyoshi

Sumio Yokokawa

An image pickup device comprises an image pickup tube having a target scanned by an electron beam and a pair of electrodes which form a collimation, a voltage applying circuit for respectively applying predetermined voltages for forming the collimation to the collimation forming electrodes of the image pickup tube, and a correction voltage applying circuit for applying a correction voltage which varies the voltage ratio of the collimation forming electrodes to one of the collimation forming electrodes, upon scanning of the peripheral parts of an effective scanning surface of the target by the electron beam. The collimation is formed responsive to a voltage ratio of the voltages applied to each of the collimation forming electrodes and changed in response to the correction voltage.

Image pickup device

A color-resolving striped filter used for a camera tube comprises a plurality of groups of filter stripes. The groups are disposed in parallel and consecutively in a sequentially repeated arrangement. Each of the groups comprises six filter strips from among, a first filter stripe having a light transmission characteristic for transmitting the light of one of the three primary colors of an addition mixture color, a second filter stripe having a light transmission characteristic for transmitting the light of a mixed color which includes the primary color transmitted through said first filter stripe and one of the other two primary colors, a transparent third filter stripe for transmitting white light, and three fourth filter stripes each of which is disposed between and adjacent to the first, second, and third filter stripes. The six filter stripes of each group are arranged in parallel and consecutively in a specific sequence.

Color-resolving striped filter for camera tube

A view-finder is used for a television camera which has an image pick-up device for picking up an image of an object responsive to incident light from the object. The television camera comprises an optical system for diverging a part of a light advancing from the object to the image pick-up device. The view-finder comprises a monochrome television picture receiving device which is supplied with an output signal of the image pick-up device and displays a monochrome picture image, and an optical system for composing the picture image of the monochrome television picture receiving device and an optical color image formed by the light diverged by the diverging optical system to form an optical image to be observed.

View-finder for television camera

A color television signal generating apparatus comprises a color-resolving striped filter, in a camera tube, for separating the output signal of the camera tube into required signals. The output of the camera tube is a superimposed signal comprising a direct wave signal containing signals of the three primary colors of said addition mixture color, and a high-band signal component comprising a group of modulated color signals resulting from an amplitude modulation of a carrier wave by the signals of two primary colors other than the primary color of the light transmitted through said first filter stripe, said carrier wave having a frequency equal to a space frequency determined by the number of said groups of filter stripes, and said carrier wave also having frequency components which are higher harmonics of the frequency of said carrier wave. The color television signal generating apparatus further comprises a first separation circuit for separating and deriving, out of the output signal of the camera tube, a fundamental wave component signal in which the carrier wave having the frequency equal to the space frequency is amplitude modulated, a second separation circuit for separating and deriving, out of the output signal of the camera tube, a second harmonics wave component signal in which a carrier wave having a frequency twice the space frequency is amplitude modulated, a multiplication circuit for multiplying the output signals of the first and second separation circuits, and a circuit for separating and deriving signals of two primary colors other than the primary color transmitted through the first filter stripe, responsive to the output signals of the multiplication means and the first separation circuit.

Color television signal generating apparatus

A signal processing circuit for a color television camera has filters supplied with a multiplex input signal. The direct wave signal includes a plurality of amplitude-modulated color component signals obtained from a camera tube of a color television camera. The tube filters the high-frequency components of the input signal. Detection and processing circuits detect the output signal of the high-pass filter and produce signals having restored DC components. The circuit provides gamma correction, white clipping, linear clipping, blanking signal mixing, or like signal processing with respect to the produced signal. A low-pass filter passes the input signal from the camera tube and filters the direct wave signal of the input signal. A processing circuit processes the output signals of the low-pass filter, and a matrix circuit matrixes the output signals of the detection and processing circuits to obtain three primary color signals. A color encoder provides a composite color video signal from the three primary color signals produced by the matrix circuit.

Signal processing circuit for a color television camera

A circuit for stabilizing the black level in an output signal of a camera tube is employed in a color television camera. The camera tube has an optical filter with an optically black part extending in parallel with a beam scanning direction of the camera tube. The stabilizing circuit comprises a clamping circuit for clamping an output signal of the camera tube during a horizontal beam blanking period and for restoring a DC component of the output signal. A circuit responds to supplied sampling pulses during every vertical scanning period, for sampling and holding an output signal of the clamping circuit. A circuit feeds back a substantially negative holding voltage of the sampling and holding circuit, to the clamping circuit.

Circuit for stabilizing the black level in an output signal of a camera

An optical comb filter has a plurality of optical comb filter elements disposed successively in the advancing direction of light. The optical comb filter characteristics attenuate and remove specific space frequencies which do not have mutual relationships of odd-number multiples and frequencies of the specific space frequencies. At least one phase plate is interposed between neighboring optical comb filter elements in front and rear positions with respect to the light advancing direction. The phase plate converts a light exiting from the front filter element into a light which is divided in the rear filter element into normal light and abnormal light, exiting with mutually equal light quantity. The normal and abnormal light enters, as incident light, the rear filter element.

Optical comb filter

A color television camera has red filter stripes overlying wider blue filter stripes which in turn overlie a green filter layer. Frequency selective decoding circuitry is provided for separating the red, blue and green representative components of the camera signal.

A circuit for stabilizing electron beam focusing is used for an electromagnetic focusing type camera tube having a high voltage generating circuit for supplying electrodes of the camera tube. A focusing current is supplied to an electron beam focusing coil of the camera tube. The focusing current supply circuit comprises an operational amplifier having an output terminal to which the focusing coil is connected. A detection resistor is connected between the focusing coil and an inverting input terminal of the operational amplifier. A first resistor is connected between the voltage source and a non-inverting input terminal of the operational amplifier. A second resistor is connected between a reference voltage source and the non-inverting input terminal of the operational amplifier.

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Ninomiya, Japan

Koichiro Motoyama