Thin-window image pick-up and recording tube

Claim 2

A thin-window cathode-ray tube adapted to record and pick up an optical image, which comprises: an evacuated envelope having a transparent face portion with a elongated thin window, a fluorescent layer being disposed within said window, said window having two longitudinal walls at least one of which being formed to have at least one portion the normal to which is inclined from the normal to said face; deflecting means for deflecting the electron beam emitted from the electron gun to scan said fluorescent layer laterally of said window so that a flying spot is produced in said layer; light-detecting means disposed sidewardly of said transparent face portion, and a plate transparent to the light and disposed on said face to cover said window.

Claim 3

A thin-window cathode-ray tube according to claim 1, wherein each longitudinal wall of said window is formed so as to have at least one portion the normal to which is inclined from the normal to said face.

Claim 4

A thin-window cathode-ray tube according to claim 1, wherein said face and said plate are kept isolated from each other.

Claim 5

A thin-window cathode-ray tube according to claim 3, further comprising a frit glass interposed between said thin window and the peripheral edge of the foremost end of said envelope, which edge has been previously indented at a suitable angle.

Claim 6

A thin-window cathode-ray tube according to claim 1, wherein a light-reflective surface of a metal backing is applied to said wall.

Claim 7

A thin-window cathode-ray tube according to claim 5, wherein said wall is uniplanarly tapered.

Claim 8

A thin-window cathode-ray tube according to claim 5, wherein said wall is biplanarly tapered.

Claim 9

A thin-window cathode-ray tube according to claim 5, wherein said wall is configured as parabolic and the focus of the parabolic surface is situated in such a manner that the reflected light can be focused while advancing perpendicularly of the scanning direction of the electron beam.

Claim 10

A thin-window cathode-ray tube according to claim 5, wherein said wall is configured as elliptical and the emitted light can be focussed while advancing perpendicularly of the scanning direction of the electron beam.

Claim 11

A thin-window cathode-ray tube according to claim 1, wherein said light-detecting means comprises a photoconductive layer applied to the outer side surface of said envelope, whereby the light is converted into electric signals.

Claim 12

A thin-window cathode-ray tube according to claim 10, wherein said photoconductive layer is applied direct to said envelope.

Claim 13

A thin-window cathode-ray tube according to claim 10, wherein said photoconductive layer is applied through an other layer coated on said envelope with said photoconductive layer, whereby the second named layer can be removed complete with said photoconductive layer from said envelope for purpose of repair.

Claim 14

A thin-window cathode-ray tube according to claim 1, wherein said light-detecting means comprises a convex lens and a photomultiplier on the side of said envelope.

Claim 15

A thin-window cathode-ray tube according to claim 13, wherein said convex lens is of Fresnel type which is adapted to have available an increased focussing efficiency. comparator

Claim 16

A facsimile apparatus comprising in combination a thin-window cathode-ray tube, including an evacuated envelope having a transparent face portion with an elongated thin window, a fluorescent layer being disposed within said window and at least one longitudinal wall of said window being formed to have at least one portion the normal to which is inclined from the normal to saiD face; deflecting means for deflecting the electron beam emitted from the electron gun to scan said fluorescent layer laterally of said window so that a flying spot is produced in said layer; a plate transparent to said flying spot and disposed on said face so as to cover said window; and an electrical arrangement including reception, balancer and transmission units, wherein said reception unit has a receiver amplifier for amplifying the received electric signals, a detector unit for detecting the electric signals applied thereto from said receiver amplifier, a video image amplifier for amplifying the detected signals and applying them to said electron gun, and a deflection amplifier for amplifying the detected signals and applying them to said deflector means; said balancer unit has a pair of amplifiers connected respectively to a pair of said light-detecting means for amplifying the applied electric signals independently of each other, and a comparator unit for comparing the signal voltages applied thereto from a pair of the last named amplifiers and for feeding back the voltage difference to said deflector amplifier; and said transmission unit has a transmitter amplifier for amplifying the electric signal applied thereto from said comparator unit, a synchronizer unit for generating a synchronized electric signal, a mixer unit for mixing the electric signal applied from said transmitter amplifier with the electric signal applied from said synchronizer unit, and a modulator unit for converting the mixed electric signal into a transmitting wave; whereby the electron beam is automatically controlled to precisely scan the center line of said window of said thin-window cathode-ray tube.

Claim 17

A facsimile apparatus comprising in combination a thin-window cathode-ray tube, including an evacuated envelope having a transparent face portion with an elongated thin window, a fluorescent layer being disposed within said window and at least one longitudinal wall of said window being formed to have at least one portion the normal to which is inclined from the normal to saiD face; deflecting means for deflecting the electron beam emitted from the electron gun to scan said fluorescent layer laterally of said window so that a flying spot is produced in said layer; a plate transparent to said flying spot and disposed on said face so as to cover said window; and an electrical arrangement including reception, balancer and transmission units, wherein said reception unit has a receiver amplifier for amplifying the received electric signals, a detector unit for detecting the electric signals applied thereto from said receiver amplifier, a video image amplifier for amplifying the detected signals and applying them to said electron gun, and a deflection amplifier for amplifying the detected signals and applying them to said deflector means; said balancer unit has a pair of amplifiers connected respectively to a pair of said light-detecting means for amplifying the applied electric signals independently of each other, and a comparator unit for comparing the signal voltages applied thereto from a pair of the last named amplifiers and for feeding back the voltage difference to said deflector amplifier; and said transmission unit has a transmitter amplifier for amplifying the electric signal applied thereto from said comparator unit, a synchronizer unit for generating a synchronized electric signal, a mixer unit for mixing the electric signal applied from said transmitter amplifier with the electric signal applied from said synchronizer unit, and a modulator unit for converting the mixed electric signal into a transmitting wave; whereby the electron beam is automatically controlled to precisely scan the center line of said window of said thin-window cathode-ray tube.