Exposure safety device and imaging equipment
By introducing an exposure safety device into the imaging equipment and using buttons and a safety module to control the power state of the drive module, the problem of X-ray exposure safety relying on control chips and software is solved, and safe and reliable exposure control and component protection are achieved.
Patent Information
- Application Number
- CN202422793609.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-15
- Publication Date
- 2025-12-23
- Estimated Expiration
- 2034-11-15
Smart Images
Figure CN223695895U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to X ray imaging technical field, specifically, relate to a kind of exposure safety device and imaging equipment. BACKGROUND
[0002] Imaging equipment such as portable dental X-ray machine, usually software program in control chip is used to control driving module to control X-ray source to generate X-ray or stop generating X-ray. But this way can make the safety of exposure output highly dependent on the stability of control chip and the robustness of software program. If control chip or software program is abnormal, it can cause improper exposure of X-ray, so that operator and patient receive X-ray beyond expectation, there is security risk. Although there is currently by adding power switch to facilitate disconnecting power supply to stop X-ray irradiation, additional hardware switch and power dismounting structure, it can affect the airtightness and structural strength of equipment. SUMMARY
[0003] The utility model aims at providing exposure safety device and imaging equipment, can effectively reduce the risk of improper exposure.
[0004] The embodiment of the utility model is realized as follows:
[0005] First, the utility model provides a kind of exposure safety device, the exposure safety device includes ray source module, control module, driving module, safety module and button module, the button module is electrically connected with the safety module, the driving module is electrically connected with the safety module, the control module and the ray source module respectively, power supply is electrically connected with the ray source module, the control module and the safety module respectively;
[0006] The control module is used to transmit start exposure signal to the driving module;
[0007] The button module is used to transmit execute exposure signal to the safety module in press state;
[0008] The safety module is used to control the driving module to be in power-on state when receiving the execute exposure signal;
[0009] The driving module is used to drive the ray source module to expose when being in power-on state and receiving the start exposure signal;
[0010] The button module is also used to transmit stop exposure signal to the safety module in release state;
[0011] The safety module is further configured to control the driving module to be in a power-off state to stop the radiation source module from radiating when the stop radiating signal is received.
[0012] In an optional embodiment, the safety module comprises a signal receiving unit, a delay unit, a comparator and a driving switch unit, the comparator is electrically connected with the signal receiving unit, the delay unit and the driving switch unit respectively, the signal receiving unit is electrically connected with the key module, and the driving switch unit is electrically connected with the power supply and the driving module respectively.
[0013] The comparator is configured to output a driving signal after receiving the execute radiating signal or the stop radiating signal.
[0014] The driving switch unit is configured to be turned on or turned off according to the driving signal; when the driving switch unit is turned on, the driving module is in a power-on state; and when the driving switch unit is turned off, the driving module is in a power-off state.
[0015] In an optional embodiment, the safety module further comprises a delay adjustment unit, the delay adjustment unit is electrically connected with the inverting input end of the comparator, the non-inverting input end of the comparator is electrically connected with the delay unit, and the output end of the comparator is electrically connected with the driving switch unit.
[0016] The delay adjustment unit is configured to adjust the voltage of the inverting input end of the comparator to adjust the delay time length of the delay output driving signal.
[0017] In an optional embodiment, the signal receiving unit comprises a PNP triode, a third resistor and at least one diode.
[0018] The emitter of the PNP triode is electrically connected with the driving power supply, the collector is electrically connected with the non-inverting input end of the comparator, the base is electrically connected with one end of the third resistor, the other end of the third resistor is electrically connected with the anode of each diode, and the cathode of each diode is electrically connected with the key module.
[0019] In an optional embodiment, the delay unit comprises a fourth resistor and a fourth capacitor.
[0020] One end of the fourth resistor is electrically connected with the non-inverting input end of the comparator and the other end is grounded.
[0021] One end of the fourth capacitor is electrically connected with the non-inverting input end of the comparator and the other end is grounded.
[0022] In an optional embodiment, the driving switch unit comprises a PMOS tube, an NMOS tube, a first resistor, a seventh resistor, a first capacitor and a second capacitor.
[0023] The source of the PMOS tube is electrically connected with the power supply, the drain of the PMOS tube is electrically connected with the driving module, the gate of the PMOS tube is electrically connected with the drain of the NMOS tube, the source of the NMOS tube is grounded, and the gate of the NMOS tube is electrically connected with the output terminal of the comparator.
[0024] One end of the first resistor is electrically connected with the power supply and the other end is electrically connected with the gate of the PMOS tube.
[0025] One end of the seventh resistor is electrically connected with the gate of the NMOS tube and the other end is grounded.
[0026] One end of the first capacitor is electrically connected with the driving module and the other end is grounded.
[0027] One end of the second capacitor is electrically connected with the driving module and the other end is grounded.
[0028] In an optional embodiment, the driving switch unit further comprises a second resistor, a fifth resistor and a fifth capacitor.
[0029] One end of the second resistor is electrically connected with the gate of the PMOS tube and the other end is electrically connected with the drain of the NMOS tube.
[0030] One end of the fifth resistor is electrically connected with the gate of the NMOS tube and the other end is electrically connected with the output terminal of the comparator.
[0031] In an optional embodiment, the delay adjustment unit comprises a sixth resistor and an eighth resistor.
[0032] One end of the sixth resistor is connected with the inverting input terminal of the comparator and the other end is electrically connected with the driving power supply.
[0033] One end of the eighth resistor is connected with the inverting input terminal of the comparator and the other end is grounded. In an optional embodiment, the delay generated by the delay unit satisfies the following condition:
[0034] τ = r4 x c4.
[0035] The delay adjusted by the delay adjustment unit satisfies the following condition:
[0036]
[0037] Wherein, r4 represents the resistance value of the fourth resistance; c4 represents the capacitance value of the fourth capacitor; τ represents the delay generated by the delay unit; r8 represents the resistance value of the eighth resistance; r6 represents the resistance value of the sixth resistance; V cc represents the voltage of the driving power supply; e represents the natural constant; t represents the delay adjusted by the delay adjustment unit.
[0038] In a second aspect, the utility model provides an imaging equipment, including the exposure insurance device of any one of preceding embodiment.
[0039] The exposure insurance device and the imaging equipment provided by the utility model, the exposure insurance device includes a ray source module, a control module, a driving module, an insurance module and a key module, the key module is electrically connected with the insurance module, the driving module is electrically connected with the insurance module, the control module and the ray source module respectively, and the power supply is electrically connected with the ray source module, the control module and the insurance module respectively.The control module is used for transmitting the start exposure signal to the driving module; the key module is used for transmitting the execution exposure signal to the insurance module under the pressing state; the insurance module is used for controlling the driving module to be in the power-on state when receiving the execution exposure signal; the driving module is used for driving the ray source module to expose when being in the power-on state and receiving the start exposure signal.The key module is also used for transmitting the stop exposure signal to the insurance module under the release state; the insurance module is also used for controlling the driving module to be in the power-off state when receiving the stop exposure signal, so that the ray source module stops exposing.The utility model has the advantages of: when the control module or the software program is abnormal, the exposure can be stopped in time through the key, so that the risk of improper exposure is effectively reduced, the safety of the operator and the patient is ensured, and the device has good airtightness. BRIEF DESCRIPTION OF DRAWINGS
[0040] In order to more clearly illustrate the technical scheme of the utility model embodiment, the following will be briefly introduced to the drawing needed to be used in the embodiment, and it should be understood that the following drawings only show some embodiments of the utility model, and should not be regarded as the limitation to the scope, and for the ordinary skilled person in the art, other related drawings can also be obtained according to these drawings without the creative labor.
[0041] Figure 1 It is one of the circuit connection schematic diagram of the exposure device provided by the utility model embodiment;
[0042] Figure 2 It is the second circuit connection schematic diagram of the exposure device provided by the utility model embodiment;
[0043] Figure 3 It is the third circuit connection schematic diagram of the exposure device provided by the utility model embodiment;
[0044] Figure 4 The fourth circuit connection schematic diagram of the exposure device is provided for the embodiment of the utility model.
[0045] Figure 5 The fifth circuit connection schematic diagram of the exposure device is provided for the embodiment of the utility model.
[0046] Icon: 110 - ray source module;120 - control module;130 - drive module;140 - insurance module;150 - key module;160 - power supply;141 - signal receiving unit;143 - delay unit;145 - comparator;147 - drive switch unit;149 - delay adjustment unit;Q1 - PMOS tube;Q2 - PNP triode;Q3 - NMOS tube;D1 - first diode;D2 - second diode;R1 - first resistor;R2 - second resistor;R3 - third resistor;R4 - fourth resistor;R5 - fifth resistor;R6 - sixth resistor;R7 - seventh resistor;R8 - eighth resistor;C1 - first capacitor;C2 - second capacitor;C3 - third capacitor;C4 - fourth capacitor;C5 - fifth capacitor. DETAILED DESCRIPTION
[0047] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be described clearly and completely below in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. The components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.
[0048] Therefore, the following detailed description of the embodiments of the utility model provided in the drawings is not intended to limit the scope of the claimed utility model, but only represents selected embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by those of ordinary skill in the art without creative labor are within the scope of protection of the utility model.
[0049] It should be noted that: similar labels and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.
[0050] In the description of the utility model, it is understood that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly used when the utility model product is used, or the orientation or positional relationship commonly understood by those skilled in the art, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model.
[0051] In addition, the terms "first", "second", "third" and the like are only used for differentiation and cannot be understood as indicating or implying relative importance.
[0052] In the description of the utility model, it is also necessary to explain that, unless otherwise explicitly specified and limited, the terms "set", "mount", "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.
[0053] Please refer to Figure 1 It is a circuit connection schematic diagram of the exposure safety device provided by the utility model embodiment. The exposure safety device comprises a ray source module 110, a control module 120, a driving module 130, a safety module 140 and a key module 150, the key module 150 is electrically connected with the safety module 140, the driving module 130 is electrically connected with the safety module 140, the control module 120 and the ray source module 110 respectively, and the power supply 160 is electrically connected with the ray source module 110, the control module 120 and the safety module 140 respectively. Optionally, the power supply 160 can select a 12V lithium battery, and a fuse can be arranged between the power supply 160 and the ray source module 110 for exposure protection.
[0054] The control module 120 is configured to transmit a start exposure signal to the driving module 130; the key module 150 is configured to transmit an execute exposure signal to the insurance module 140 in a pressing state; the insurance module 140 is configured to control the driving module 130 to be in a power-on state when the execute exposure signal is received; and the driving module 130 is configured to drive the ray source module 110 to expose when the driving module 130 is in the power-on state and the start exposure signal is received. In addition, the key module 150 is further configured to transmit a stop exposure signal to the insurance module 140 in a releasing state; and the insurance module 140 is further configured to control the driving module 130 to be in a power-off state when the stop exposure signal is received, so that the ray source module 110 stops exposing.
[0055] In the embodiment, when exposure is needed, the user can transmit the start exposure signal to the driving module 130 through the control module 120, and the user also needs to press the key module 150 to make the key module 150 continuously be in the pressing state, so as to transmit the execute exposure signal to the insurance module 140. The insurance module 140 controls the driving module 130 to be in the power-on state after the execute exposure signal is received. Then, the driving module 130 drives the ray source module 110 to generate X rays when the driving module 130 is in the power-on state and the start exposure signal is received, so as to realize exposure.
[0056] When the control module 120 or the software program is abnormal, or when exposure needs to be stopped in advance, the user releases the key module 150 to make the key module 150 be in the releasing state, so as to transmit the stop exposure signal to the insurance module 140. The insurance module 140 controls the driving module 130 to be in the power-off state after the stop exposure signal is received, so that the driving module 130 stops driving the ray source module 110 to generate X rays, thereby realizing stopping exposure.
[0057] It can be seen that the exposure insurance device provided by the embodiment of the utility model realizes that whether the driving module works is controlled through the key module and the insurance module, so as to control whether the ray source module generates X rays. Therefore, when the control module or the software program is abnormal, exposure can be stopped in time through the key, the risk of improper exposure is effectively reduced, the safety of the operator and the patient is ensured, and meanwhile, the device has good airtightness.
[0058] Please refer to Figure 2 It is another kind of circuit connection schematic diagram of the exposure insurance device provided by the embodiment of the utility model. The insurance module 140 comprises a signal receiving unit 141, a delay unit 143, a comparator 145 and a driving switch unit 147, the comparator 145 is electrically connected with the signal receiving unit 141, the delay unit 143 and the driving switch unit 147 respectively, the signal receiving unit 141 is electrically connected with the key module 150, and the driving switch unit 147 is electrically connected with the power supply 160 and the driving module 130 respectively.
[0059] The comparator 145 is configured to output the driving signal after receiving the exposure execution signal or the exposure stop signal. The driving switch unit 147 is configured to be turned on or turned off according to the driving signal. When the driving switch unit 147 is turned on, the driving module 130 is in a power-on state. When the driving switch unit is turned off, the driving module 130 is in a power-off state.
[0060] In the embodiment, the safety module 140 receives the exposure execution signal or the exposure stop signal transmitted by the key module 150 through the signal receiving unit 141. The comparator 145 outputs the driving signal after a delay through the delay unit 143. The driving switch unit 147 is turned on or turned off according to the driving signal. When the driving switch unit 147 is turned on, the power supply 160 supplies power to the driving module 130, so that the driving module 130 is in a power-on state, and the radiation source module 110 is driven to expose. When the driving switch unit 147 is turned off, the power supply 160 stops supplying power to the driving module 130, so that the driving module 130 is in a power-off state, and the radiation source module 110 stops exposing.
[0061] It can be understood that, compared with the existing method of controlling the exposure stop by controlling the on-off of the power supply through the contact switch, the embodiment of the utility model makes the comparator output the driving signal after a delay through the delay unit, so that the driving module is delayed to be powered on or powered off after the key is pressed or released. Therefore, the voltage and current impact on the driving module caused by rapidly pressing and releasing the key multiple times can be avoided, the component damage is effectively avoided, and the service life is prolonged.
[0062] Please refer to Figure 3 It is another circuit connection schematic diagram of the exposure safety device provided by the embodiment of the utility model. The safety module 140 further includes a delay adjustment unit 149, the delay adjustment unit 149 is electrically connected with the inverting input end of the comparator 145, the non-inverting input end of the comparator 145 is electrically connected with the delay unit 143, and the output end of the comparator 145 is electrically connected with the driving switch unit 147. The delay adjustment unit 149 is configured to adjust the voltage of the inverting input end of the comparator 145, so as to adjust the delay time of the delay output driving signal.
[0063] In the embodiment, when the delay range of the delay unit 143 is limited, the voltage of the inverting input end of the comparator 145 can be adjusted through the delay adjustment unit 149, so as to adjust the delay time of the delay output driving signal, thereby meeting the actual use requirement.
[0064] Please refer to Figure 4is another kind of circuit connection schematic diagram of the exposure insurance device provided by the embodiment of the utility model. Wherein the signal receiving unit 141 includes PNP triode Q2, third resistance R3 and two diodes D1 and D2. The emitter e of PNP triode Q2 is electrically connected with the driving power supply, the collector c is electrically connected with the noninverting input terminal of comparator 145, the base b is electrically connected with one end of third resistance R3, the other end of third resistance R3 is electrically connected with the anode of two diodes D1 and D2, and the cathode of two diodes D1 and D2 is electrically connected with the button module 150.
[0065] Optionally, the driving power supply can be 5V, and can also be set according to actual conditions, and the number of diodes can also be set according to actual conditions, and the utility model is not limited.
[0066] It can be understood that the button module can support different forms of external input buttons, and different buttons can be operated by diodes. Thus, after a single button fails, other buttons can still be used to start the exposure insurance device, so as to ensure normal operation of the device.
[0067] Please continue to refer to Figure 4 Wherein the delay unit 143 includes the fourth resistance R4 and the fourth capacitor C4. One end of the fourth resistance R4 is electrically connected with the noninverting input terminal of comparator 145 and the other end is grounded; one end of the fourth capacitor C4 is electrically connected with the noninverting input terminal of comparator 145 and the other end is grounded. And the positive power supply end of comparator 145 is electrically connected with the driving power supply, and the negative power supply end of comparator 145 is grounded.
[0068] It can be understood that, in order to ensure that the voltage of the positive power supply end of the comparator 145 is stable, a third capacitor C3 can also be provided, and one end of the third capacitor C3 is electrically connected with the noninverting input terminal of the comparator 145 and the other end is grounded.
[0069] Please continue to refer to Figure 4 Wherein the driving switch unit 147 includes PMOS tube Q1, NMOS tube Q3, first resistance R1, seventh resistance R7, first capacitor C1 and second capacitor C2. The source s of PMOS tube Q1 is electrically connected with the power supply 160, the drain d of PMOS tube Q1 is electrically connected with the driving module 130, the gate g of PMOS tube Q1 is electrically connected with the drain d of NMOS tube Q3, the source s of NMOS tube Q3 is grounded, the gate g of NMOS tube Q3 is electrically connected with the output end of comparator 145; one end of first resistance R1 is electrically connected with the power supply 160 and the other end is electrically connected with the gate g of PMOS tube Q1; one end of seventh resistance R7 is electrically connected with the gate g of NMOS tube Q3 and the other end is grounded; one end of first capacitor C1 is electrically connected with the driving module 130 and the other end is grounded; one end of second capacitor C2 is electrically connected with the driving module 130 and the other end is grounded.
[0070] It can be understood that the first capacitor C1 and the second capacitor C2 are used for smoothing filtering the voltage of the power supply, the first resistor R1 is used for making the PMOS Q1 in the on or off state, and the seventh resistor R7 is used for making the NMOS Q3 in the on or off state.
[0071] Referring to Figure 5 It is another kind of circuit connection schematic diagram of the exposure insurance device provided by the embodiment of the utility model. The driving switch unit 147 further includes a second resistor R2, a fifth resistor R5 and a fifth capacitor C5. One end of the second resistor R2 is electrically connected with the gate g of the PMOS Q1 and the other end is electrically connected with the drain d of the NMOS Q3; one end of the fifth resistor R5 is electrically connected with the gate g of the NMOS Q3 and the other end is electrically connected with the output end of the comparator 145.
[0072] It can be understood that the second resistor R2 and the fifth resistor R5 are used for current limiting to play a buffering role, so as to protect the PMOS Q1 and the NMOS Q3. And because the rapid pressing and releasing of the key will cause the rapid change of the current, the sharp peak voltage will be generated, which will cause damage to the elements. The seventh resistor R7 and the fifth capacitor C5 can form a simple peak absorption circuit, so that when the sharp peak voltage appears, the fifth capacitor C5 is rapidly charged to absorb the excess energy, and the seventh resistor R7 limits the rapid change of the current to reduce the amplitude of the sharp peak voltage, thereby reducing the damage of the sharp peak voltage to the elements and prolonging the service life.
[0073] Please continue to refer to Figure 5 It is another kind of circuit connection schematic diagram of the exposure insurance device provided by the embodiment of the utility model. The delay adjustment unit 149 includes a sixth resistor R6 and an eighth resistor R8. One end of the sixth resistor R6 is connected with the inverting input end of the comparator 145 and the other end is electrically connected with the driving power supply; one end of the eighth resistor R8 is connected with the inverting input end of the comparator 145 and the other end is grounded.
[0074] It can be understood that the voltage of the inverting input end of the comparator 145 can be adjusted by adjusting the resistance ratio of the sixth resistor R6 and the eighth resistor R8 in the delay adjustment unit 149, so as to adjust the delay time length of the delay output driving signal.
[0075] Optionally, the delay generated by the delay unit 143 satisfies the following condition:
[0076] τ=r4×c4;
[0077] The delay adjusted by the delay adjustment unit 149 satisfies the following condition:
[0078]
[0079] Wherein, r4 represents the resistance value of the fourth resistor R4; c4 represents the capacitance value of the fourth capacitor C4; τ represents the delay generated by the delay unit; r8 represents the resistance value of the eighth resistor R8; r6 represents the resistance value of the sixth resistor R6; V cc represents the voltage of the driving power supply; e represents the natural constant; t represents the delay adjusted by the delay adjustment unit.
[0080] For example, assuming that the resistance value of the fourth resistor R4 is 100000 ohms, and the capacitance value of the fourth capacitor C4 is 1x10 -6 farad, then the delay τ generated by the delay unit is 0.1 seconds. And assuming that the resistance value of the sixth resistor R6 in the delay adjustment unit is equal to the resistance value of the eighth resistor R8, then the adjusted delay t is 69.3 milliseconds.
[0081] In order to facilitate understanding, the working principle of the exposure insurance device provided by the embodiment of the utility model will be described below. Figure 5 The working principle of the exposure insurance device provided by the embodiment of the utility model will be described below.
[0082] When exposure is needed, the user can transmit the start exposure signal to the driving module 130 through the control module 120, and the user also needs to press the key module 150, so that the key module 150 is in the pressed state. When the key module 150 is in the pressed state, the cathode of any one diode in the signal receiving unit 141 is grounded, so that the PNP triode Q2 is turned on, and then the driving power supply V cc will charge the fourth capacitor C4 through the PNP triode Q2.
[0083] In the process of charging the fourth capacitor C4, the voltage V OPA+ of the non-inverting input end of the comparator will gradually increase, and after a very short time, the voltage V OPA+ of the non-inverting input end will be greater than the voltage V OpA- of the inverting input end, that is, V OPA+ >V OPA- , then the comparator outputs high level. When the comparator outputs high level, the NMOS tube Q3 is turned on, so that the PMOS tube Q1 is also turned on, and then the power supply 160 supplies power to the driving module 130, so that the driving module 130 is in the power-on state. When the driving module 130 is in the power-on state and receives the start exposure signal, the X-ray source module 110 generates X-rays, thereby realizing exposure. And when the key module 150 continuously stays in the pressed state, the capacitor voltage of the fourth capacitor C4 is always the driving power supply, so that the comparator continuously outputs high level, thereby making the X-ray source module 110 continuously generate X-rays to realize continuous exposure.
[0084] When the control module 120 or the software program is abnormal, or when the exposure needs to be stopped in advance, the user releases the key module 150, so that the key module 150 is in the released state. When the key module 150 is in the released state, the cathodes of all diodes in the signal receiving unit 141 are not grounded, so that the PNP transistor Q2 is turned off, and then the fourth capacitor C4 is discharged through the fourth resistor R4.
[0085] In the process of discharging the fourth capacitor C4, the voltage V OPA+ of the non-inverting input end of the comparator gradually decreases, and after a certain time, the voltage V OPA+ of the non-inverting input end is less than the voltage V OPA- of the inverting input end, that is, V OPA+ <V OPA- , then the comparator outputs a low level. When the comparator outputs a low level, the NMOS transistor Q3 is turned off, so that the PMOS transistor Q1 is also turned off, so that the power supply 160 stops supplying power to the driving module 130, so that the driving module 130 is in the power-off state, so that the ray source module 110 stops generating X-rays, thereby realizing stopping exposure.
[0086] It can be understood that the delay adjustment unit 149 adjusts the reference value of the voltage V OPA- of the inverting input end of the comparator 145 through the resistance values of the sixth resistor R6 and the eighth resistor R8, so that when the fourth capacitor C4 is charged, the voltage V OPA+ of the non-inverting input end is adjusted to increase to be greater than the voltage V OpA- of the inverting input end, and when the fourth capacitor C4 is discharged, the voltage V OPA+ of the non-inverting input end is adjusted to decrease to be less than the voltage V OPA- of the inverting input end.
[0087] The embodiment of the utility model further provides an imaging equipment, the imaging equipment includes the exposure insurance device provided by the utility model embodiment.
[0088] The above only is the preferred embodiment of the utility model, and does not use for limiting the utility model, for the person skilled in the art, the utility model can have various changes and changes. Any modification, equivalent replacement, improvement etc. that is made within the spirit and principle of the utility model should be included in the protection scope of the utility model.
Claims
1. An exposure insurance device characterized by comprising: The exposure insurance device comprises a ray source module, a control module, a driving module, an insurance module and a key module, the key module is electrically connected with the insurance module, the driving module is electrically connected with the insurance module, the control module and the ray source module respectively, and a power supply is electrically connected with the ray source module, the control module and the insurance module respectively; The control module is used for transmitting a start exposure signal to the driving module; The key module is used for transmitting an execute exposure signal to the insurance module in a pressing state; The insurance module is used for controlling the driving module to be in a power-on state when the execute exposure signal is received; The driving module is used for driving the ray source module to expose when being in the power-on state and receiving the start exposure signal; The key module is also used for transmitting a stop exposure signal to the insurance module in a releasing state; The insurance module is also used for controlling the driving module to be in a power-off state to stop the ray source module from exposing when the stop exposure signal is received.
2. The exposure insurance device according to claim 1, wherein The insurance module comprises a signal receiving unit, a delay unit, a comparator and a driving switch unit, the comparator is electrically connected with the signal receiving unit, the delay unit and the driving switch unit respectively, the signal receiving unit is electrically connected with the key module, and the driving switch unit is electrically connected with the power supply and the driving module respectively; The comparator is used for outputting a driving signal after receiving the execute exposure signal or the stop exposure signal; The driving switch unit is used for being turned on or turned off according to the driving signal; when the driving switch unit is turned on, the driving module is in the power-on state; and when the driving switch unit is turned off, the driving module is in the power-off state.
3. The exposure insurance device according to claim 2, wherein The insurance module further comprises a delay adjustment unit, the delay adjustment unit is electrically connected with an inverting input end of the comparator, a non-inverting input end of the comparator is electrically connected with the delay unit, and an output end of the comparator is electrically connected with the driving switch unit; The delay adjustment unit is used for adjusting the voltage of the inverting input end of the comparator to adjust the delay time length of the delay output driving signal.
4. The exposure insurance device according to claim 2, wherein The signal receiving unit comprises a PNP triode, a third resistor and at least one diode; An emitter of the PNP triode is electrically connected with a driving power supply, a collector is electrically connected with the non-inverting input end of the comparator, a base is electrically connected with one end of the third resistor, the other end of the third resistor is electrically connected with an anode of each diode, and a cathode of each diode is electrically connected with the key module.
5. The exposure insurance device according to claim 2, wherein The delay unit comprises a fourth resistor and a fourth capacitor; One end of the fourth resistor is electrically connected with the non-inverting input end of the comparator and the other end is grounded; One end of the fourth capacitor is electrically connected with the non-inverting input end of the comparator and the other end is grounded.
6. The exposure insurance device according to claim 2, wherein The driving switch unit comprises a PMOS tube, an NMOS tube, a first resistor, a seventh resistor, a first capacitor and a second capacitor; The source of the PMOS transistor is electrically connected with the power supply, the drain of the PMOS transistor is electrically connected with the driving module, the gate of the PMOS transistor is electrically connected with the drain of the NMOS transistor, the source of the NMOS transistor is grounded, and the gate of the NMOS transistor is electrically connected with the output terminal of the comparator; One end of the first resistor is electrically connected with the power supply, and the other end is electrically connected with the gate of the PMOS transistor; One end of the seventh resistor is electrically connected with the gate of the NMOS transistor, and the other end is grounded; One end of the first capacitor is electrically connected with the driving module, and the other end is grounded; One end of the second capacitor is electrically connected with the driving module, and the other end is grounded.
7. The exposure insurance device according to claim 6, wherein The driving switch unit further includes a second resistor, a fifth resistor and a fifth capacitor; One end of the second resistor is electrically connected with the gate of the PMOS transistor, and the other end is electrically connected with the drain of the NMOS transistor; One end of the fifth resistor is electrically connected with the gate of the NMOS transistor, and the other end is electrically connected with the output terminal of the comparator.
8. The exposure insurance device according to claim 3, wherein The delay adjustment unit includes a sixth resistor and an eighth resistor; One end of the sixth resistor is connected with the inverting input terminal of the comparator, and the other end is electrically connected with the driving power supply; One end of the eighth resistor is connected with the inverting input terminal of the comparator, and the other end is grounded.
9. The exposure insurance device according to claim 8, wherein The delay generated by the delay unit satisfies the following condition: τ=r4×c4; The delay adjusted by the delay adjustment unit satisfies the following condition: Wherein, r4 represents the resistance value of the fourth resistor; c4 represents the capacitance value of the fourth capacitor; τ represents the delay generated by the delay unit; r8 represents the resistance value of the eighth resistor; r6 represents the resistance value of the sixth resistor; V cc represents the voltage of the driving power supply; e represents the natural constant; t represents the delay adjusted by the delay adjustment unit.
10. An image forming apparatus characterized by comprising: The exposure insurance device includes any one of claims 1 to 9.