CN2476858Y - Display for navigation radar - Google Patents

Abstract

The utility model belongs to a monitor used on a navigation radar, comprising a shell, a control panel, a display tube, a deflection coil and a main circuit board. A secondary of a horizontal drive transformer in the main circuit board is provided with a reverse coil driven by the reverse polarity; a horizontal output transformer is a flat-wise transformer, the inductance of which ranges from 250 to 280MuH; a resistance connected in parallel with the field deflection coil has a certain resistance value ranging from 350 to 600Ohm. The utility model is characterized in that: the distortion factor of image is small, and the image distortion is just 5 percent measured by a radar retrace signal wave generator; the ringing disappears, and the image quality, positioning precision, accuracy and reliability are improved noticeably, etc.

Description

A kind of navar display

The utility model belongs to a kind of electronics and shows (supervision) device, particularly a kind of can with matching used display such as navar.This display also can be supporting as showing that (supervision) device uses with corresponding apparatus in the fields such as medical treatment, finance, industry.

Radar Technology is applied to each field of society more and more widely, and also more and more higher to its performance demands.Therefore, concerning as demonstration (supervision) device of terminal device, its performance also requires corresponding raising.At present, the radarscope (import equipment) of widely used QB1069 types such as China's seagoing vessel, fishing vessel, its structure mainly comprises display tube (CRT), deflection coil, contain interface circuit, video circuit, synchronous signal circuit, a width of cloth regulating circuit, vertical output circuit, field-scanning circuit, row energization and line output circuit, line correcting circuit at interior main circuit board, housing and control panel.Though this display has brightness, sharpness, sensitivity and stability than characteristics such as height, but owing to the defective of its local circuit and component structure exists 1. degree of accuracy relatively poor, poor image quality, obviously there is phenomenon wide at the top and narrow at the bottom, after circle shows signal and the echoed signal stack, shows signal shaping distortion; During the padding signal, the top character in, the bottom character is long; 2. " ring " phenomenon is arranged at visual top; 3. defectives such as vertical-linearity control narrow range, linear difference.

The purpose of this utility model is the defective that exists at background technology, improve a kind of navar display of design,, improve degree of accuracy, reliability and picture quality that image shows to reach on the basis that keeps former performance characteristics, reduce degree of distortion, overcome purposes such as " ring " phenomenon.

The utility model is in vertical direction (promptly vertical the placement) according to the long in use limit of cathode-ray tube (CRT), and raster is from the upper right corner downwards, scan left.At this principle of work, the utility model changes the row energization mode into the reversed polarity excitation by the excitation of the same polarity of background technology, row driving transformer secondary coil oppositely (be about to the reverse coiling of its coil or two ends are oppositely connect), so that collector output pulse broadens, make line output valve saturation conduction and ending better, thereby improved line linearity, solved wide on the image, following narrow problem; Simultaneously line output transformer is changed into flatly around formula and suitably adjust the number of turn of the primary coil of line output by the groove of background technology around formula, former inductance 200 μ H are brought up to 250～280 μ H, to eliminate the ringing on grating top; To be reduced to 35～60% of former resistance with field deflection coil parallel resistor resistance again, promptly,, improve the linearity of its trace to eliminate the caused spurious oscillation of retrace interval by reducing to 350 Ω～600 Ω about former 1K Ω; Thereby realize its purpose.Therefore, the utility model comprises display tube, deflection coil contains the main circuit board of interface circuit, video circuit, synchronous signal circuit, a width of cloth regulating circuit, vertical output circuit, field-scanning circuit, row energization and line output circuit, line correcting circuit, housing and control panel; Key is that the secondary coil of the capable driving transformer in the line driver circuit wherein is for producing the reverse coiling of reversed polarity excitation; Around the formula transformer, its outputting inductance amount is 250～280 μ H to line output transformer in the line output circuit for flat; And with field deflection coil parallel resistor resistance be 350～600 Ω; The annexation of each unit, device and circuit is all same with background technology.Above line output transformer secondary coil is if adopt the forward coiling, then adopt and oppositely connect to produce the reversed polarity driving pulse, the emitter that is about to former and line output triode and ground wire connect end altogether and change into by resistance and being connected with base stage, and former changing into emitter and ground wire by resistance and base stage link connect altogether.

The utility model changes the row energization mode into the reversed polarity excitation because will to go the driving transformer secondary coil reverse; Around formula change flat around formula and with its inductance raising 25～40% by groove line output transformer; To be reduced to 35～60% of former resistance with field deflection coil parallel resistor resistance simultaneously, impedance is descended,, reduce by four angular distortion degree in the image to change waveform distortion.Therefore, it is little to the utlity model has the image fault degree, and by adopting radar flyback signal wave producer side amount, its picture degree of distortion drops to 5% by 10% of background technology, ringing disappears, characteristics such as picture quality, bearing accuracy and accuracy, the obvious raising of reliability.

Accompanying drawing and description of drawings

Fig. 1, be the utility model front elevation;

Fig. 2, be the utility model circuit structure block scheme;

Fig. 3, line output transformer loop construction synoptic diagram.

Among the figure: 1. housing, 2. display tube (CRT), 3. control panel; 4～1. interface circuits, 4～2. video circuits, 4～3. synchronous signal circuits, 4～4. width of cloth regulating circuits, 4～5. vertical output circuits, 4～6. line-scan circuits, 4～7. line driver circuits, 4～8. line output circuits, 4～9. line correcting circuits.

Embodiment

Present embodiment is with 10, and " the monochromatic cathode-ray tube display of high precision is an example: its circuit structure and interface circuit 4～1 thereof, video circuit 4～2; synchronous signal circuit 4～3; width of cloth regulating circuit 4～4; vertical output circuit 4～5; line-scan circuit 4～6; line driver circuit 4～7, line output circuit 4～8, display tube (CRT) 2 and compile switch coil annexation each other all with background technology, promptly show that for the QB1069 device device is identical with model.But wherein: after the secondary coil of the capable driving transformer in the line driver circuit 4～7 is taked reverse coiling, the two ends tap still connects altogether with the emitter of line output triode and ground wire respectively and is connected to base terminal by resistance string, and the number of turn of primary and secondary coil and turn ratio are all constant; Output transformer coil in the line output circuit 4～7 adopts puts down around formula, changes 3 circles (circle) in its primary coil between the tap 3,4 into, is 27 circles between the tap 4,10, makes its inductance value reach 260 μ H; And will reduce to 560 Ω with the caused spurious oscillation of abundant elimination retrace interval by former 1K Ω with the field deflection coil parallel resistor, improve the linearity of trace.The physical dimension of all the other housings 1, control panel 3 and mounting means etc. also all with

Background technology is identical.

Claims (2)

1, a kind of navar display, comprise display tube, deflection coil contains the main circuit board of interface circuit, video circuit, synchronous signal circuit, a width of cloth regulating circuit, vertical output circuit, field-scanning circuit, row energization and line output circuit, line correcting circuit, housing and control panel; The secondary coil that it is characterized in that the capable driving transformer in the line driver circuit is for producing the reverse coiling of reversed polarity excitation; Around the formula transformer, its inductance value is 250～280 μ H to line output transformer in the line output circuit for flat; And with field deflection coil parallel resistor resistance be 350～600 Ω; The annexation of each unit, device and circuit is all same with background technology.

2, by the described navar display of claim 1; It is characterized in that described line output transformer secondary coil if adopt the forward coiling, then adopt and oppositely connect to produce the reversed polarity driving pulse, the emitter that is about to former and line output triode and ground wire connect end altogether and change into by resistance and being connected with base stage, and former changing into emitter and ground wire by resistance and base stage link connect altogether.

Images