8results about "Cathode-ray/electron-beam tube circuit elements" patented technology

There is disclosed a gated power supply for a night vision system includes an input terminal to receive source power, and output terminal to electrically couple to a photocathode, a first voltage source to source a positive or neutral voltage to the photocathode, a second voltage source to source a large negative voltage to the photocathode, and a switching circuit to switch between the first voltage source and the second voltage source on a duty cycle, wherein the switching circuit comprises an optical switch.

The present invention provides an electron beam deflection control circuit, comprising: a first voltage source module, having a first end connected to a power supply and a second end configured to output a positive voltage; a first controllable switch, having a first end connected to the second end of the first voltage source module, the second end of the first controllable switch connected to the first end of a magnetic field generator, and the second end of the magnetic field generator connected to a reference ground; when the first voltage source module outputs a positive voltage and the first controllable switch is turned on, current flows from the first end to the second end of the magnetic field generator; a second voltage source module, having a first end connected to the power supply and a second end configured to output a negative voltage; a second controllable switch, having a first end connected to the first end of the magnetic field generator and a second end connected to the second end of the second voltage source module; when the second voltage source module outputs a negative voltage and the second controllable switch is turned on, current flows from the second end to the first end of the magnetic field generator. This control circuit has low design cost and high power density.

The invention discloses a field emission electron gun driving circuit which comprises an FEG data transmission module, an extraction electrode voltage module, a cathode heating current module, a suppression electrode voltage module, an ion pump power supply module and an analog quantity detection module. The FEG data transmission module is used for converting a digital control signal sent by the upper computer through the IC bus into an analog signal, transmitting the analog signal to other modules in the driving circuit, receiving an analog quantity detection signal of the analog quantity detection module, converting the analog quantity detection signal into a digital quantity, and transmitting the digital quantity back to the upper computer through the IC bus; the ion pump power module is used for providing working power for the ion pump; the cathode heating current module is used for generating constant current to heat a cathode filament; the suppression electrode voltage module is used for generating suppression electrode voltage; the leading-out electrode voltage module is used for generating leading-out electrode voltage; the analog quantity detection module is used for detecting analog quantity signals of all the modules and transmitting the analog quantity signals to the FEG data transmission module. The method has the advantages of good stability, high reliability and the like.

The invention relates to an image acquisition device comprising an image intensifier tube; and a CMOS sensor. The CMOS sensor has a sensitive area configured to transform photons transmitted by an optical output interface of the image intensifier tube into images. Furthermore, the CMOS sensor comprises a second set of pixels, each pixel of the second set of pixels of the CMOS sensor being configured to be assigned to one or more pixels of a first set of pixels of a wavelength selective filter, fixed on an external face of an input window of the image intensifier tube, by means of a specific calibration phase (Pc). Figure for abstract: Fig 6e

The present invention provides an electron beam deflection control circuit and a CT detector. The electron beam deflection control circuit includes: a first branch, a second branch, a switching circuit, and a magnetic field generating device; the first branch is used to generate a first current; the second branch is used to generate a second current, and the first current and the second current are not equal; the switching circuit is used to control the first branch and the second branch to conduct alternately; the magnetic field generating device is used to generate a magnetic field for controlling the deflection of the electron beam. The first current is input from the first end of the magnetic field generating device and output from the second end, and the second current is input from the second end of the magnetic field generating device and output from the first end. By using the electron beam deflection control circuit provided by the invention, the current amplitude of the magnetic field deflection can be adjusted arbitrarily, and the asymmetric deflection of the electron beam can be realized.

An electron beam source includes a vacuum chamber containing a cathode and an anode separated by a vacuum gap forming a local full-voltage capacitive structure storing electrical energy at an operating voltage. A high-voltage power supply charges the capacitive structure without an intervening Marx generator, linear transformer driver, Tesla transformer, pulse-forming network, or pulse-forming transmission line. A triggering arrangement initiates electron emission to produce electron pulses traversing the vacuum gap, with discharged electrical energy transferred predominantly to electrons crossing the gap. In some embodiments, the local capacitive structure stores a majority of total electrical energy stored at the operating voltage in capacitances directly coupled between conductors at cathode and anode potentials. Multi-beam configurations, beam steering, passive synchronization, and contamination management features may be included.

This application relates to a power supply device and forming process control method for an electron gun in space additive manufacturing. It is applicable to on-orbit additive manufacturing of cold cathode electron guns and is a device that can provide negative high voltage, pulsed current, and electrostatic field voltage to regulate the operating voltage of the filament coaxial cold cathode electron gun and promote droplet transfer in a microgravity environment. Addressing the shortcomings of existing technologies and the unique characteristics of the microgravity additive manufacturing environment, this application proposes a power supply device for a space additive manufacturing electron gun by setting an electrostatic field terminal at the beam output end of the filament coaxial cold cathode electron gun to provide it with an electrostatic field voltage, causing the droplets to be subjected to electrostatic force and accelerating droplet transfer. To ensure the orderly and controllable deposition and forming of metal droplets in a microgravity environment, a pulsed current is introduced to further promote droplet transfer. Through the above methods, the power supply device and forming process control method for the space additive manufacturing electron gun provided in this application meet the requirements for efficient, high-quality, and rapid manufacturing of filament coaxial cold cathode electron guns in the space environment.

The invention discloses a low-light-level image intensifier with high electromagnetic compatibility and a manufacturing method thereof. The low-light-level image intensifier comprises an image intensifier tube, a power supply circuit board, a feed-through capacitor filtering assembly, a conductive adhesive and a split type encapsulation box structure. Wherein the feed-through capacitor filtering assembly suppresses power supply input interference through broadband filtering, and electromagnetic shielding is achieved through the metal shielding film and the conductive adhesive; the split type encapsulation box adopts a two-section type cylindrical shell, and the shielding continuity is improved through conductive adhesive connection; the contact piece type and lead wire type dual-form design respectively adapts to different interface requirements, the contact piece type is connected through positive and negative electrode contact pieces, and the lead wire type realizes external power supply through a leading-out wire. According to the manufacturing method, reflow soldering is adopted to weld the filtering assembly, and the production efficiency is improved through a modularized potting process. The invention solves the problems of poor electromagnetic compatibility and insufficient shock resistance of the existing equipment, and has the characteristics of high shielding effectiveness and strong adaptability.