Abstract: A leakage prevention system for a downward spraying-type nebulizer for stacking a biomaterial of a bio-3D printer according to the present disclosure is provided, wherein the system constituting an output unit of the bio-3D printer includes: a nebulizer that downwardly sprays a biomaterial into a form of mist toward a substrate; a vacuum cap that is detachably installed on a upper portion of the nebulizer; a distributor that is connected to the vacuum cap with a hose; a vacuum generating module that is connected to the distributor with a hose; a compressor that generates an air pressure in the vacuum generating module; and a controller that is electrically connected to the vacuum generating module and the nebulizer, controlling an output pressure of the vacuum generating module and an action of the nebulizer.

Abstract: An apparatus for preventing photocuring of biomaterial in a discharge nozzle and in a dispenser of a bio 3D printer includes a driving unit for providing a driving force, a shutter member that receives the driving force from the driving unit and to move between a first position not covering the discharge nozzle and a second position covering at least the discharge nozzle in a reciprocating manner, and a control unit for controlling the discharge nozzle. The driving unit, the shutter member, the discharge nozzle, and the plurality of light sources constitute a head unit in an integrated manner. The head unit includes an end plane. The shutter member and a distal end of the discharge nozzle are positioned near a center of the end plane. The plurality of light sources are positioned on the end plane with the shutter member and the discharge nozzle therebetween.

Abstract: An apparatus for preventing photocuring of biomaterial in a discharge nozzle and in a dispenser of a bio 3D printer includes a driving unit for providing a driving force, a shutter member that receives the driving force from the driving unit and to move between a first position not covering the discharge nozzle and a second position covering at least the discharge nozzle in a reciprocating manner, and a control unit for controlling the discharge nozzle. The driving unit, the shutter member, the discharge nozzle, and the plurality of light sources constitute a head unit in an integrated manner. The head unit includes an end plane. The shutter member and a distal end of the discharge nozzle are positioned near a center of the end plane. The plurality of light sources are positioned on the end plane with the shutter member and the discharge nozzle therebetween.

Abstract: The present invention relates to a color cathode ray tube in which beam landing errors caused by non-uniform thermal expansion of a shadow mask are corrected such that color purity is improved. In one aspect of the present invention, a color cathode ray tube comprises a panel on inner surface of which a phosphor screen is formed; a funnel joined to the panel; an electron gun; a shadow mask mounted to the panel, the shadow mask having a faceplate portion and a peripheral skirt portion bent back from the faceplate portion; and a frame joined to said shadow mask; wherein radius of curvature of at least a corner of the faceplate portion of said shadow mask is not smaller than 50 mm, and gap is provided between a corner of the faceplate portion of said shadow mask and a corresponding corner of said frame.

Abstract: A cathode ray tube includes a shadow mask having a faceplate portion and a skirt portion. The faceplate portion includes an apertured portion. A frame is provided having a supporting portion and a bottom portion that extends by width Da from the short side of the supporting portion. Da satisfies the relation Da<Ha×La/P+Na, where La represents a distance between a center point of the faceplate portion and a short side of the apertured portion, Na represents a distance between the short side of the apertured portion and a short side of the border of the faceplate portion, P represents a distance between the electron beams deflection center and the center point of the faceplate portion, and Ha represents a distance between the short side of the border of the faceplate portion and a short side of a rear end line of the supporting portion.

Abstract: A color cathode ray tube in which beam landing errors caused by non-uniform thermal expansion of a shadow mask are corrected is provided such that color purity is improved. The color cathode ray tube in accordance with the present invention comprises a panel having a phosphor screen formed on an inner surface thereof, a shadow mask having a faceplate portion and a peripheral skirt portion bent back from the faceplate portion and a frame joined to the skirt portion, wherein a height of the skirt portion is less than or equal to 12 mm for substantially the entire skirt portion, and a plurality of holes are perforated at the skirt portion.

Abstract: Anti-howling device in a cathode ray tube including anti-howling means having contact members each in contact with a shadow mask for receiving, and dispersing a vibration, and connecting members for connecting adjacent contact members, and fixing means for actually bringing the contact members in the anti-howling means into contact with the shadow mask, wherein the contact members receive the vibration of the shadow mask, to disperse the vibration by impact and friction between the contact members and the shadow mask.

Abstract: A color cathode ray tube is disclosed, in which a purity correction means is installed in an outer side between an effective region and an effective screen, thereby decreasing distortion of the screen without deteriorating characteristics of a deflection yoke, and minimizing change of a misconvergence to improve color purity of the screen and productivity. To this end, the color cathode ray tube includes a panel 10 constituting a screen; a funnel 20 attached at the rear of the panel, having a bulb shape; a shadow mask 30 installed to be separated from the panel for choosing colors; and a purity correction means 60 installed to be close to the shadow mask. More preferably, the purity correction means 60 is attached in a range from a margin (S) of an effective screen of a panel to an effective end of the shadow mask 30 in an entire surface of the panel in which distortion of the screen is generated.

Abstract: Shadow mask in a flat cathode ray tube having a damping wire fastened across a no-hole region between adjacent lines of beam pass through holes formed on a vertical line in the shadow mask for damping vibration of the shadow mask, including means for limiting a position of the damping wire on the no-hole region of the shadow mask, thereby enhancing a damping effect to improve a picture quality, and permitting to simplify a fabrication process and cut down a production cost.

Abstract: Anti-howling device in a cathode ray tube including anti-howling means having contact members each in contact with a shadow mask for receiving, and dispersing a vibration, and connecting members for connecting adjacent contact members, and fixing means for actually bringing the contact members in the anti-howling means into contact with the shadow mask, wherein the contact members receive the vibration of the shadow mask, to disperse the vibration by impact and friction between the contact members and the shadow mask.