Electric light shutter noise reduction parameter screening system

Abstract

The utility model relates to the technical field of optics, and discloses a noise reduction parameter screening system for an electric light shutter, which aims at carrying out parameter tuning on a single electric light shutter to realize noise reduction. The system comprises an electric light shutter which is provided with a light through hole, buffer strips arranged on the left side and the right side of the light through hole, a shutter blocking piece connected with a motor transmission shaft, and a circuit board used for detecting the position relation between the shutter blocking piece and the light through hole. The shutter blocking piece is used for moving in the area between the buffer strips on the two sides under driving of the motor. A single chip microcomputer on the circuit board is connected with the motor so as to drive the running state of the motor to be matched with shutter parameters set by a user according to the optimal noise reduction combination of the PWM frequency and the PWM duty ratio determined by the noise reduction parameter screening system; the noise reduction parameter screening system comprises a noise detector and an upper computer connected with the single-chip microcomputer.

Description

Technical Field

[0001] The utility model relates to the technical field of optics, in particular to an electric optical shutter noise reduction parameter screening system. Background Art

[0002] The electric optical shutter is a component commonly used in optical path deployment.

[0003] In the actual production process, most electric optical shutter manufacturers assemble all accessories uniformly before shipping. Electric optical shutters of the same model are usually set based on unified factory parameters, while ignoring the individual noise detection of each electric optical shutter after assembly, and have never further considered optimizing the factory parameters based on noise reduction, resulting in most electric optical shutters making relatively loud noise during use, affecting the user experience. Utility Model Content

[0004] The utility model aims to disclose a noise reduction parameter screening system for an electric optical shutter, so as to realize noise reduction by performing parameter tuning on a single electric optical shutter.

[0005] To achieve the above-mentioned purpose, the electric optical shutter noise reduction parameter screening system disclosed in the utility model comprises:

[0006] An electric optical shutter is provided with a light-through hole, buffer zones disposed on the left and right sides of the light-through hole, a shutter block connected to a motor drive shaft, and a circuit board for detecting a positional relationship between the shutter block and the light-through hole; the positional relationship at least includes a fully open state of the light-through hole and a fully closed state of the light-through hole;

[0007] The shutter block is used to move in the area between the buffer belts on both sides under the drive of the motor;

[0008] The single chip microcomputer on the circuit board is connected to the motor so as to drive the running state of the motor to match the shutter parameters set by the user according to the optimal noise reduction combination of PWM (Pulse Width Modulation) frequency and PWM duty ratio determined by the noise reduction parameter screening system;

[0009] The noise reduction parameter screening system includes a noise detector and a host computer connected to the single-chip microcomputer; the host computer is used to test the noise decibels corresponding to different PWM frequency and PWM duty cycle parameter combinations after the shutter works stably under the same shutter parameters set by the test user, and then screen out the PWM frequency and PWM duty cycle parameter combination with the smallest noise decibel as the optimal noise reduction combination.

[0010] Preferably, the shutter is provided with a display screen and input buttons for entering user setting parameters.

[0011] Preferably, the circuit board is fixed with at least first and second photoelectric sensors paired with the first and second light sources respectively, and the single chip computer determines the actual frequency of the shutter plate according to the back and forth blocking of the first light source and the second light source by the shutter plate during the displacement process.

[0012] Preferably, the host computer establishes an electrical signal connection with the noise detector to automatically collect noise decibel data of each test combination adjusted by step size after the shutter works stably through traversal, and then automatically screen out the best noise reduction combination.

[0013] The utility model has a simple and practical structure and has the following beneficial effects:

[0014] 1. By adjusting the PWM duty cycle, the optical shutter can select the appropriate power-on rate according to the operating frequency during operation, achieve the appropriate torque size, and reduce the noise caused by the impact of the baffle and the buffer belt.

[0015] 2. The utility model tests the noise decibels corresponding to different PWM frequency and PWM duty ratio parameter combinations after the shutter works stably under the same shutter parameters set by the test user, and then selects the PWM frequency and PWM duty ratio parameter combination with the smallest noise decibel as the best noise reduction combination. In special cases, when there are two best noise combinations, the one with a higher PWM frequency is preferred to reduce low-frequency noise.

[0016] 3. Based on the best noise combination selected by the same shutter parameters, in actual working conditions, after the user switches to other shutter parameters, the noise decibel level is basically close, ensuring reliability and facilitating promotion and implementation.

[0017] The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0019] Figure 1 It is a structural schematic diagram of the electric optical shutter disclosed in the embodiment of the utility model.

[0020] Figure 2 It is an electric control logic framework diagram of the electric optical shutter disclosed in the embodiment of the utility model. DETAILED DESCRIPTION

[0021] The embodiments of the present invention are described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered by the claims.

[0022] Example 1

[0023] This embodiment discloses a system for selecting noise reduction parameters of an electric optical shutter. Figure 1 and Figure 2 As shown, including:

[0024] The electric optical shutter is provided with a light hole 1, buffer zones arranged on the left and right sides of the light hole, a shutter block 2 connected to the motor drive shaft, and a circuit board 4 for detecting the positional relationship between the shutter block and the light hole; the positional relationship at least includes a fully open state of the light hole and a fully closed state of the light hole.

[0025] The shutter stopper is used to be displaced in the area between the buffer belts on both sides under the drive of the motor.

[0026] The single chip microcomputer (MCU) on the circuit board is connected to the motor to match the running state of the motor with the shutter parameters set by the user according to the optimal noise reduction combination of PWM frequency and PWM duty cycle determined by the noise reduction parameter screening system. Optionally, the shutter parameters mainly include: the initial state of the shutter (open or closed), the duration of the shutter opening, the duration of the shutter closing, and the cyclic mode of switching back and forth between the shutter opening and closing states. Correspondingly, in the process of matching the running state of the motor with the shutter parameters set by the user according to the optimal noise reduction combination of PWM frequency and PWM duty cycle determined by the noise reduction parameter screening system, it mainly includes calculating the number of pulses corresponding to the PWM frequency for the duration of the shutter opening, and the timing relationship between various signals (including the local clock signal, the touch signal corresponding to the switch duration of the PWM frequency signal machine shutter, etc.); such calculations are prior art known to those skilled in the art and will not be repeated.

[0027] Among them, the expected target frequency of the shutter can be calculated based on the length of time the shutter is open and the length of time the shutter is closed, and the actual operating frequency of the shutter can be obtained by detecting the positional relationship between the shutter block and the light hole based on the circuit board. Normally, the operating frequency is close to the target frequency, and when the difference between the two exceeds a certain threshold range, it can be regarded as a fault in the electric optical shutter. In some actual usage scenarios, users can also correct the length of time the shutter is open and the length of time the shutter is closed according to the actual operating frequency to achieve the expected target frequency; similarly, this is a prior art known to those skilled in the art and will not be elaborated on.

[0028] PWM is a very effective technology that uses the digital output of a microprocessor to control analog circuits. It is widely used in many fields from measurement, communication to power control and conversion. The utility model reduces the noise of the optical shutter by adjusting the frequency and duty cycle of PWM through PC software. Among them, the PWM frequency refers to the number of times (one cycle) that the signal changes from high level to low level and then returns to high level within 1 second; that is, how many cycles of PWM there are in one second; the PWM duty cycle is the ratio of the time the high level is maintained to the time of the clock cycle of the PWM within a pulse cycle.

[0029] In this embodiment, the noise reduction parameter screening system includes a noise detector and a host computer connected to the single-chip microcomputer. The host computer is used to test the noise decibels corresponding to the parameter combinations of different PWM frequencies and PWM duty cycles after the shutter works stably under the same shutter parameters set by the test user, and then screen out the parameter combination of PWM frequency and PWM duty cycle with the smallest noise decibel as the best noise reduction combination. Preferably, the host computer in this embodiment establishes an electrical signal connection with the noise detector, so as to automatically collect the noise decibel data of each test combination adjusted by the step size after the shutter works stably by traversing, and then automatically screen out the best noise reduction combination. As a degraded implementation, it can also be recorded and selected manually.

[0030] In this embodiment, the motor drive shaft may optionally be Figure 1 The electromagnet 3 shown is connected to the circuit board via the drive interface 6. Further, as Figure 1 As shown in FIG. 1 , the circuit board can be divided into a motor driving circuit part for driving the motor and a circuit part for position detection, and the two parts can be electrically connected through a connector 5. In this way, the logical structure of the system of this embodiment can also be as follows: Figure 2 As shown, the electric optical shutter can be divided into two parts as a whole:

[0031] The first part is the control box, which contains MCU, motor drive circuit, buttons and display screen.

[0032] The second part is the optical shutter body, which includes a position detection circuit board, a motor and a baffle. The baffle is fixed on the shaft of the brushed motor and moves with the movement of the motor. The motor can be a DC brushed motor.

[0033] The two parts are connected through a 6-pin aviation plug such as GX12.

[0034] The MCU is responsible for receiving signals from the host computer (PC) software or buttons, and outputting PWM control signals to the motor drive circuit based on the received signals.

[0035] The display screen is responsible for displaying the current light shutter information parameters and menu settings.

[0036] The motor drive circuit drives the motor according to the received PWM control signal, including the control of speed and direction.

[0037] The motor drives the baffle to realize the opening and closing of the optical shutter.

[0038] The position detection circuit detects the current position of the shutter through a photoelectric sensor or a Hall sensor, and feeds back to the MCU according to the signal change to realize a closed loop of position detection. Optionally, the position detection circuit is fixed with first and second photoelectric sensors paired with the first and second light sources respectively, and the single chip determines the actual frequency of the shutter according to the back and forth blocking of the first light source and the second light source by the shutter during the displacement process.

[0039] In summary, the electric optical shutter noise reduction parameter screening system disclosed in the utility model is simple and practical, and has the following beneficial effects:

[0040] 1. By adjusting the PWM duty cycle, the optical shutter can select the appropriate power-on rate according to the operating frequency during operation, achieve the appropriate torque size, and reduce the noise caused by the impact of the baffle and the buffer belt.

[0041] 2. The utility model tests the noise decibels corresponding to different PWM frequency and PWM duty ratio parameter combinations after the shutter works stably under the same shutter parameters set by the test user, and then selects the PWM frequency and PWM duty ratio parameter combination with the smallest noise decibel as the best noise reduction combination. In special cases, when there are two best noise combinations, the one with a higher PWM frequency is preferred to reduce low-frequency noise.

[0042] 3. Based on the best noise combination selected by the same shutter parameters, in actual working conditions, after the user switches to other shutter parameters, the noise decibel level is basically close, ensuring reliability and facilitating promotion and implementation.

[0043] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. An electric optical shutter noise reduction parameter screening system, characterized in that: include: An electric optical shutter is provided with a light-through hole, buffer zones disposed on the left and right sides of the light-through hole, a shutter block connected to a motor drive shaft, and a circuit board for detecting a positional relationship between the shutter block and the light-through hole; the positional relationship at least includes a fully open state of the light-through hole and a fully closed state of the light-through hole; The shutter block is used to move in the area between the buffer belts on both sides under the drive of the motor; The single chip microcomputer on the circuit board is connected to the motor so as to drive the running state of the motor to match the shutter parameters set by the user according to the optimal noise reduction combination of PWM frequency and PWM duty ratio determined by the noise reduction parameter screening system; The noise reduction parameter screening system includes a noise detector and a host computer connected to the single-chip microcomputer; the host computer is used to test the noise decibels corresponding to different PWM frequency and PWM duty cycle parameter combinations after the shutter works stably under the same shutter parameters set by the test user, and then screen out the PWM frequency and PWM duty cycle parameter combination with the smallest noise decibel as the optimal noise reduction combination.

2. The electric optical shutter noise reduction parameter screening system according to claim 1, characterized in that: The shutter is provided with a display screen and input buttons for entering user setting parameters.

3. The electric optical shutter noise reduction parameter screening system according to claim 1, characterized in that: The circuit board is fixed with at least first and second photoelectric sensors paired with the first and second light sources respectively, and the single chip computer determines the actual frequency of the shutter flap according to the back and forth shielding of the first light source and the second light source by the shutter flap during displacement.

4. The electric optical shutter noise reduction parameter screening system according to claim 1, characterized in that: The host computer establishes an electrical signal connection with the noise detector to automatically collect the noise decibel data of each test combination adjusted by the step size after the shutter works stably through traversal, and then automatically screen out the best noise reduction combination.

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