CN2049519U - Multifunction signal generator for examinating vision objectively - Google Patents
Multifunction signal generator for examinating vision objectively Download PDFInfo
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- CN2049519U CN2049519U CN 89208905 CN89208905U CN2049519U CN 2049519 U CN2049519 U CN 2049519U CN 89208905 CN89208905 CN 89208905 CN 89208905 U CN89208905 U CN 89208905U CN 2049519 U CN2049519 U CN 2049519U
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Abstract
The utility model discloses a multifunction signal generator for examination vision objectively, which is formed through that a host circuit board is connected with a control floor on a shell by a line and the host circuit comprises a group synchronization oscillator, a two-way image synthesis gating square wave producer, a black and white grating generator, a visual target size choosing circuit, two electronic gates, a gating circuit, a gating square wave producer and a synthesis power amplifier output circuit. The utility model is connected with a black and white displayer or a black and white television by electrical cables, able to display three dynamic visual targets including inducing and repressing opticokinetic nystagmus, pursuit and gaze, and prepotency manner by adjusting the screen, examines the eyesight of different persons objectively and accurately and is easy in use.
Description
The invention belongs to the medical diagnosis instrument field.
In existing clinical ophthalmology and health check-up; measure the traditional international E word visual acuity chart inspection technique of the general employing of vision; this inspection technique must rely on experimenter's abundant cooperation; for non-partners such as some malingering blindnesses, back of the body note visual acuity chart, mentally disabled, preschooler and infant, it is inaccurate to use this inspection that difficulty or test result usually can take place.Since the fifties, external attention application is brought out and is suppressed the railway nystagmus method and measure vision objectively, though the instrument and the method for some objective determination visions are arranged at present both at home and abroad, and these instruments are mechanical mostly, adopt movable rotation sighting target, also have corresponding transmission and side steering simultaneously, the structure more complicated is because its function singleness can not be used for all detected objects, use is restricted, and is not very convenient.
The purpose of this utility model is to overcome the deficiency of above-mentioned existence, provides a kind of and easy to use can be applicable to that showing of all kinds of personnel bring out and suppress railway nystagmus, follow the trail of and watch attentively and select the multifunctional objective of three kinds of dynamic visual testing signs of the excellent expression signal generator of testing eyesight on black and white display or black and white television.
This utility model is to realize like this, the control table top is arranged on casing, the host circuit board that is formed by connecting by group synchronization agitator, the synthetic gate squarer of two-way image, black and white grid generator, sighting target size Selection circuit, electronic gate A, electronic gate B, gating circuit, gate squarer and synthesized power amplifier output circuit is connected with the control table top by circuit, form the multifunctional objective signal generator of testing eyesight, this signal generator can join with the black and white television of cable with black and white display or change slightly.
Said group synchronization agitator is made up of two agitators, a half adder and two followers, and its four end is connected with the synthetic gate square-wave generator of two-way image, black and white grid generator, gate squarer and synthesized power amplifier output circuit respectively.The synthetic gate square-wave generator of two-way image is made up of Schmidt's agitator, and its input links to each other with group synchronization agitator one end, and outfan links to each other with the input of electronic gate B.The black and white grid generator is made up of an agitator, and its two end links to each other with group synchronization agitator, electronic gate A respectively.Sighting target size Selection circuit is made up of a delay circuit, two differentiators, and its two end links to each other with electronic gate A, electronic gate B respectively.Electronic gate A is made up of four NAND gate, and its four end links to each other with black and white grid generator, sighting target size Selection circuit, electronic gate B, gate squarer respectively.Electronic gate B is made up of four NAND gate and a half adder, and its five terminal synthesizes the gate square-wave generator with electronic gate A, two-way image respectively, and black and white grid generator, sighting target size Selection circuit link to each other with gating circuit.Gating circuit is made up of a NAND gate and two phase inverters, and its three end links to each other with electronic gate B, gate squarer and synthesized power amplifier output circuit respectively.The gate squarer is made up of an intervalometer, a phase convertor, two agitators, a differentiator, two half adders and four NAND gate.Its two end links to each other with group synchronization agitator, gating circuit respectively.The synthesized power amplifier output circuit is made up of a triode and a diode, and its two end links to each other with group synchronization agitator, gating circuit respectively, has an end can be connected to the input of black and white television or black and white display by 75 Ω cables in addition.
Multifunctional objective is tested eyesight the signal generation by 75 Ω cables and black and white display or black and white television connection, turns on the power switch, can produce following three kinds of different sighting targets on the television screen through being adjusted at:
1, brings out and suppress railway nystagmus.The image that occurs on the television screen is divided into three parts, up and down the black and white grid of two parts for moving by certain speed; Mid portion is a black vaginal discharge, therebetween the square sighting target of adularescent standard.White square sighting target size and E word table opening equivalence are respectively from 0.1～1.0.The minimum sighting target that makes the experimenter suppress railway nystagmus is experimenter's vision level.Inspection through 200 shows that this inspection can be measured the unreal persons' of vision such as malingering blindness true vision objective and accurately.
2, tracking is watched attentively.Be interrupted the single white square sighting target that occurs about showing on the television screen, be particularly suitable for checking children ' s vision.As tried the child and can see sighting target clearly and will produce eye and swing, the Frequency Synchronization that eye swings and occurs with sighting target.Make and tried the child and produce the minimum sighting target that swings of eye, be the vision level of being tried the child.
3, select excellent expression.The square sighting target of the bunchiness that occur to move on television screen lures and compels infant and watch attentively, and examiner's peep-hole behind the scenes observes infant eye and face and watches expression attentively and can measure its objective sight.This method is specially adapted to check infant eyesight.
This utility model has following advantage:
1, this signal generator and black and white display or black and white television logotype have and show and to bring out and suppresses railway nystagmus, follow the trail of the function of watching and select three kinds of dynamic visual testing signs of excellent expression attentively that can check the object choice use according to difference, the gained result is objective and accurate.
2, this signal generator and black and white display or black and white television logotype, sighting target and adjustable brightness thereof are used very convenient.
3, this signal generator also can be united use with the Electronystagmogram machine, can trace the nystagmus image objectively.
Describe embodiment in detail below in conjunction with accompanying drawing:
Fig. 1 is the test eyesight profile sketch map of signal generator of multifunctional objective.
Fig. 2 is the host circuit board frame principle figure.
Fig. 3 is the host circuit board circuit diagram.
Fig. 4 is the test eyesight power circuit diagram of signal generator of multifunctional objective.
Fig. 5 is the test eyesight internal structure sketch map of signal generator of multifunctional objective.
Fig. 6 is the casing schematic rear view.
The front of casing ［ 2 ］ is a control table top ［ 1 ］, and voltage dial gauge ［ 4 ］, sighting target selector switch ［ 5 ］, main passive switch ［ 6 ］, on and off switch ［ 7 ］, spatial frequency switch ［ 8 ］, frequency fine tuning potentiometer ［ 9 ］, voltage adjustment potentiometer ［ 10 ］ and functional select switch ［ 11 ］ are housed respectively on the control table top ［ 1 ］.Signal accessory power outlet ［ 12 ］, sighting target jump frequency regulator potentiometer ［ 13 ］, electric fuse ［ 14 ］ and the supply socket ［ 15 ］ that connects television set or black and white display is equipped with in the back of casing.
Host circuit board ［ 3 ］ is connected with control table top ［ 1 ］ by circuit.Host circuit board ［ 3 ］ is made up of group synchronization agitator ［ 12 ］, the synthetic gate squarer ［ 13 ］ of two-way image, black and white grid generator ［ 14 ］, sighting target size Selection circuit ［ 15 ］, electronic gate A ［ 16 ］, electronic gate B ［ 17 ］, gating circuit ［ 18 ］, gate squarer ［ 19 ］ and synthesized power amplifier output circuit ［ 20 ］.
Two agitators ［ 22,24 ］ its cycle of group synchronization agitator ［ 12 ］ is respectively 20ms, 50ms, and pulse width is respectively 150 μ s, 5 μ s.The output signal of two agitators ［ 22,24 ］ is delivered to half adder ［ 25 ］ respectively, mixes to form the output of group synchronization signal; Another output signal of two agitators ［ 22,24 ］ is delivered to follower ［ 26 ］ and follower ［ 28 ］ respectively.
Schmidt's agitator ［ 29 ］ of the synthetic gate square-wave generator ［ 13 ］ of two-way image is made up of NAND gate, and its cycle is adjusted to about 50 μ s, and pulse width is 8 μ s, and its vibration is synchronous with agitator ［ 24 ］, and its pulse front edge differs from 1/2 line period.
The agitator of black and white grid generator ［ 23 ］ is made up of NAND gate, and its cycle is 4ms, and pulsewidth was 1/2 cycle, when closing a switch K, with agitator ［ 22 ］ with identical frequency, the black and white grid maintains static on the display.When opening K switch, the trimmer potentiometer of adjusting frequency ［ 9 ］, the black and white grid on the display will be by slow to fast rotation.
The delay circuit ［ 37 ］ of sighting target size Selection circuit ［ 15 ］ is made up of a NAND gate, it postpones 1 μ s with the synthetic gate square wave of two-way image of the anti-phase output of NAND gate ［ 33 ］, deliver to the differentiator of forming by XOR gate ［ 41 ］, the synthetic gate square wave front edge differential of two-way image after differentiator ［ 41 ］ will postpone again, its width is subjected to the control of sighting target selector switch ［ 5 ］.Another differentiator ［ 52 ］ is made up of XOR gate, and it is with the waveform differential of electronic gate A ［ 16 ］ output, and its width is controlled by sighting target selector switch ［ 5 ］.NAND gate ［ 54 ］ is sent in two spikes behind two differentiators ［ 41,52 ］ differential simultaneously, two signals with send the square signal of standard sighting target.
The NAND gate ［ 40 ］ of electronic gate A ［ 16 ］ is the switch of this circuit, its input/output terminal is connected on two NAND gate ［ 44 respectively, 45 ］ on the input, two NAND gate ［ 44,45 ］ another input respectively with agitator ［ 23 ］, agitator ［ 30 ］ links to each other, whether NAND gate ［ 40 ］ ground connection, functional select switch on the controlled table top ［ 11 ］ control, two NAND gate ［ 44,45 ］ outfan links to each other with NAND gate ［ 49 ］, is 20ms by NAND gate ［ 49 ］ with black and white grid signal or cycle, deliver to differentiator ［ 52 ］ with the in-phase symmetrical square wave of H frequency and carry out differential.
The input of the NAND gate of electronic gate B ［ 27 ］ links to each other with agitator ［ 23 ］, and controlled by NAND gate ［ 40 ］, its outfan links to each other with the input of NAND gate ［ 32 ］, NAND gate ［ 33 ］ is the switch of this circuit, its two end connects NAND gate ［ 32 ］ and NAND gate ［ 35 ］ respectively, and the input of NAND gate ［ 35 ］ connects NAND gate ［ 54 ］.The synthetic control of NAND gate ［ 33 ］ output two-way image square wave is timing in pulse, and NAND gate ［ 32 ］ is opened, black and white grid signal from NAND gate ［ 27 ］ can pass through, when negative, NAND gate ［ 35 ］ is opened in pulse, and the standard sighting target selects the output signal of circuit to pass through.Two paths of signals synthesizes through half adder ［ 38 ］, is sent to subordinate's gating circuit ［ 18 ］.
The phase inverter ［ 22 ］ of gating circuit ［ 18 ］ will carry out anti-phase from the signal of half adder ［ 38 ］, deliver to NAND gate ［ 46 ］ again, another outfan of NAND gate ［ 46 ］ is a control end, when getting positive potential, the permission signal passes through, otherwise signal does not just pass through, and NAND gate ［ 46 ］ is delivered to phase inverter ［ 50 ］ with signal, through phase inverter ［ 50 ］ signal is delivered to synthesized power amplifier output circuit ［ 20 ］.
The intervalometer ［ 21 ］ of gate squarer ［ 19 ］ is Schmidt's agitator, its cycle be a few tens of milliseconds～several seconds, be subjected to sighting target jump frequency regulator potentiometer ［ 13 ］ control, its output signal one road is delivered to the phase convertor of being made up of XOR gate ［ 31 ］, and the electronic gate of being made up of three NAND gate ［ 43,47,48 ］ and half adder ［ 51 ］ is delivered on another road.By the agitator ［ 30 ］ that NAND gate is formed, the H that is input as cycle 20ms frequently is output as and symmetrical square wave that H is frequently synchronous.One the road delivers to phase convertor ［ 31 ］, delivers to the half adder of being made up of XOR gate ［ 39 ］ for one of two the tunnel in addition, delivers to NAND gate ［ 45 ］ for one.One of phase convertor ［ 31 ］ output changes the symmetrical square waves of 180 degree by the periodic Control of agitator ［ 30 ］ frequently back and forth with H with phase place frequently, deliver to differentiator ［ 34 ］, the light pulse of exporting behind the differential is delivered to the agitator ［ 36 ］ that constitutes by NAND gate, it is 20ms that agitator ［ 36 ］ produces one-period, pulse width is 5ms, the cycle square wave that the trigger impulse that pulse position and differentiator ［ 34 ］ send is synchronous, again the cycle square wave is transported to half adder ［ 39 ］, through with the output signal addition of agitator ［ 30 ］ after deliver to the input of the NAND gate ［ 48 ］ of electronic gate again, the input of the NAND gate ［ 47 ］ of electronic gate is directly delivered on another road, as two ends of the NAND gate ［ 43 ］ of switch respectively with two NAND gate ［ 47,48 ］ join, two NAND gate ［ 47,48 ］ output signal is added on the half adder ［ 51 ］ that is made of XOR gate, deliver to the gating circuit ［ 53 ］ that constitutes by NAND gate by half adder ［ 51 ］ output, deliver to NAND gate ［ 46 ］ by the signal of gating circuit ［ 53 ］ output then, the control end of NAND gate ［ 46 ］ links to each other with functional select switch ［ 11 ］.Like this, before intervalometer ［ 21 ］ is in during the half period, it is that 20ms, pulse width are 5ms, forward position and the H in-phase square wave that opens the door frequently that half adder ［ 51 ］ is sent one-period, show that on television screen left 1/4 width opens the door, otherwise, when intervalometer ［ 21 ］ was in later half cycle, half adder ［ 51 ］ sent that one-period is identical, pulse width is identical, tailing edge and the frequently anti-phase synchronous square wave that opens the door of H, is shown as right 1/4 width and opens the door on television screen.
A 3DK2B audion of synthesized power amplifier output circuit ［ 20 ］ is formed class a audio power amplifier, the synthetic two paths of signals of 2CK20 diode, be group synchronization signal and picture intelligence (standard sighting target etc.), two paths of signals is by the synthetic input of base stage, transistor collector output, and use 75 Ω cables to be connected to black and white display or black and white television input.
The NAND gate of using in the present embodiment is four NAND gate 4093, and XOR gate is four XOR gates 4070.
Power supply is input as the 220V alternating voltage, after 15W mains transformer ［ 56 ］ transformation, the 220V alternating voltage is become the 12V alternating voltage, through power supply circuit board ［ 55 ］ rectifying and voltage-stabilizing filtering, stable 12V DC voltage is flowed to main frame use.
Claims (10)
1, a kind of multifunctional objective signal generator of testing eyesight, one control table top [1] is arranged on the casing [2], it is characterized in that by the synthetic gate squarer [13] of group synchronization agitator [12], two-way image, black and white grid generator [14], sighting target size Selection circuit [15], electronic gate A[16], electronic gate B[17], the host circuit board [4] that is formed by connecting of gating circuit [18], gate squarer [19] and synthesized power amplifier output circuit [20] by circuit with control table top [1] and be connected.
2, by the said multifunctional objective of claim 1 signal generator of testing eyesight, it is characterized in that said group synchronization agitator ［ 12 ］ is made up of two agitators ［ 22,24 ］, a half adder ［ 25 ］ and two followers ［ 26,28 ］, four ends of group synchronization agitator ［ 12 ］ are connected with the synthetic gate square-wave generator ［ 13 ］ of two-way image, black and white grid generator ［ 14 ］, gate squarer ［ 19 ］ and synthesized power amplifier output circuit ［ 20 ］ respectively.
3, by the said multifunctional objective of claim 1 signal generator of testing eyesight, it is characterized in that said two-way image synthesizes gate square-wave generator ［ 13 ］ and is made up of Schmidt's agitator ［ 29 ］, its input links to each other with group synchronization agitator ［ 12 ］ one ends, and outfan links to each other with the input of electronic gate B ［ 17 ］.
4, by the said multifunctional objective of claim 1 signal generator of testing eyesight, it is characterized in that said black and white grid generator ［ 14 ］ is made up of an agitator ［ 23 ］, its two end is connected with group synchronization agitator ［ 12 ］, electronic gate A ［ 16 ］ respectively.
5, by the said multifunctional objective of claim 1 signal generator of testing eyesight, it is characterized in that said sighting target size Selection circuit is made up of a delay circuit ［ 37 ］, a NAND gate ［ 54 ］, two differentiators ［ 41,52 ］, its two end links to each other with electronic gate A ［ 16 ］, electronic gate B ［ 17 ］ respectively.
6, by the said multifunctional objective of claim 1 signal generator of testing eyesight, it is characterized in that said electronic gate A ［ 16 ］ is made up of 4 NAND gate ［ 40,44,45,49 ］, its four end links to each other with black and white grid generator ［ 14 ］, sighting target size Selection circuit ［ 15 ］, electronic gate B ［ 17 ］, gate squarer ［ 19 ］ respectively.
7, by the said multifunctional objective of claim 1 signal generator of testing eyesight, it is characterized in that said electronic gate B ［ 17 ］ is made up of 4 NAND gate ［ 27,32,33,35 ］ and a half adder ［ 38 ］, its five terminal links to each other with gating circuit ［ 18 ］ with electronic gate A ［ 16 ］, the synthetic gate square-wave generator ［ 13 ］ of two-way image, black and white grid generator ［ 14 ］, sighting target size Selection circuit ［ 15 ］ respectively.
8, by the said multifunctional objective of claim 1 signal generator of testing eyesight, it is characterized in that said gating circuit ［ 18 ］ is made up of a NAND gate ［ 46 ］ and two phase inverters ［ 42,50 ］, its three end links to each other with electronic gate B ［ 17 ］, gate squarer ［ 19 ］ and synthesized power amplifier output circuit ［ 20 ］ respectively.
9, by the said multifunctional objective of claim 1 signal generator of testing eyesight, it is characterized in that described gate squarer ［ 19 ］ is made up of 1 intervalometer ［ 21 ］, 1 phase convertor ［ 31 ］, two agitators ［ 30,36 ］, a differentiator ［ 34 ］, two half adders ［ 39,51 ］ and 4 NAND gate ［ 43,47,48,53 ］, its two end links to each other with group synchronization agitator ［ 12 ］, gating circuit ［ 18 ］ respectively.
10, by the said multifunctional objective of claim 1 signal generator of testing eyesight, it is characterized in that two ends of described synthesized power amplifier output circuit ［ 20 ］ are connected with gating circuit ［ 18 ］ with group synchronization agitator ［ 12 ］ respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89208905 CN2049519U (en) | 1989-06-22 | 1989-06-22 | Multifunction signal generator for examinating vision objectively |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89208905 CN2049519U (en) | 1989-06-22 | 1989-06-22 | Multifunction signal generator for examinating vision objectively |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2049519U true CN2049519U (en) | 1989-12-20 |
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ID=4865515
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 89208905 Expired - Lifetime CN2049519U (en) | 1989-06-22 | 1989-06-22 | Multifunction signal generator for examinating vision objectively |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2049519U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108968906A (en) * | 2013-04-29 | 2018-12-11 | 卡尔蔡司光学国际有限公司 | For determining the method and system of the ametropia characteristic of the eyes of children |
| CN109303546A (en) * | 2017-07-26 | 2019-02-05 | 车诚 | Vision testing method and system |
-
1989
- 1989-06-22 CN CN 89208905 patent/CN2049519U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108968906A (en) * | 2013-04-29 | 2018-12-11 | 卡尔蔡司光学国际有限公司 | For determining the method and system of the ametropia characteristic of the eyes of children |
| US10881292B2 (en) | 2013-04-29 | 2021-01-05 | Carl Zeiss Vision International Gmbh | Method and system for determining the refractive properties of an eye of a child |
| CN108968906B (en) * | 2013-04-29 | 2021-07-09 | 卡尔蔡司光学国际有限公司 | Method and system for determining the refractive properties of a child's eye |
| CN109303546A (en) * | 2017-07-26 | 2019-02-05 | 车诚 | Vision testing method and system |
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| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C15 | Extension of patent right duration from 15 to 20 years for appl. with date before 31.12.1992 and still valid on 11.12.2001 (patent law change 1993) | ||
| RN01 | Renewal of patent term | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |