System and method for controlling transmissivity of optical image acquisition device

Abstract

The invention belongs to the field of optical image acquisition, and provides a transmissivity control system and method for an optical image acquisition device in order to solve the problems that an existing VND filter product cannot accurately control ND value changes, is not convenient to use and is poor in user experience, and the system comprises a controller, a driving circuit and ND glass. The controller is used for receiving control information and sending the control information to the driving circuit; and the driving circuit is used for generating a PWM signal according to the control information and outputting the PWM signal to drive the ND glass so as to realize control of multi-stage ND values. According to the invention, accurate and convenient ND value control is realized, and the use experience of the product is greatly improved. The invention provides a high-quality ND adjustment scheme applied to image acquisition equipment such as a camera and a video camera, and provides better use experience and a more friendly operation environment for a user.

Description

Technical Field

[0001] The present invention belongs to the field of optical image acquisition, and in particular, relates to a transmittance control system and method for an optical image acquisition device. Background Art

[0002] ND (Neutral Density) filters can attenuate light intensity. After light from the visible light region to the near-infrared light region passes through the neutral density filter, different wavelengths are attenuated at the same rate, allowing the optical element to maintain approximately equal light energy transmittance in a wide band. Existing VND filter products usually use a mechanical manual mode, or a potentiometer sampling method, or a mechanical rotation method to achieve ND value changes. This control method will generate vibration and noise, and it is difficult to accurately control the ND gear. In addition, the existing VND filters have few reserved gears, or use a potentiometer to control the ND value change, which cannot accurately control the ND value change, is not convenient to use, and has a poor user experience. Summary of the invention

[0003] The embodiments of the present application provide a transmittance control system and method for an optical image acquisition device, which provides accurate and convenient ND value control and greatly improves the user experience of the product.

[0004] In a first aspect, an embodiment of the present application provides a transmittance control system for an optical image acquisition device, comprising: a controller, a driving circuit and ND glass; the controller is used to receive control information and send the control information to the driving circuit; the driving circuit is used to generate a PWM signal according to the control information, output the PWM signal to drive the ND glass, and realize multi-level ND value control.

[0005] Wherein, the driving circuit includes a buck-boost unit, a voltage doubler and rectifier unit, and a conversion and output unit; The buck-boost unit is used to receive the voltage parameters sent by the controller and output an adjustable voltage according to the voltage parameters; The voltage doubling rectifier unit is used to double the adjustable voltage output by the buck-boost unit, and then output a driving voltage after filtering and voltage stabilization, and the driving voltage is used to drive the transistor of the conversion output unit; The conversion output unit is used to: receive a first PWM signal sent by the controller, the first PWM signal is a custom signal; convert the adjustable voltage output by the buck-boost unit into a second PWM signal according to the first PWM signal, the second PWM signal is an AC signal, the frequency and duty cycle of the second PWM signal are the same as those of the first PWM signal, and the amplitude is the same as the adjustable voltage output by the buck-boost unit, and the second PWM signal is used to drive the ND glass to achieve multi-level ND value control.

[0006] The buck-boost unit includes: a buck-boost chip, a pin 1 of the buck-boost chip is connected to one end of a resistor R128, one end of a capacitor C8, one end of a capacitor C15, and one end of an inductor L9, the other end of the capacitor C8 and the other end of the capacitor C15 are both grounded, the other end of the inductor L9 is connected to a power supply, the other end of the resistor R128 is connected to an enable pin 3 of the buck-boost chip, one end of the capacitor C28, and a cathode of a diode D10, the other end of the capacitor C28 is grounded, the anode of the diode D10 is connected to one end of the resistor R4, and the other end of the resistor R4 is connected to a controller; Pin 4 of the buck-boost chip is connected to one end of the resistor R132, the other end of the resistor R132 is connected to a 3.3V voltage, the SCL pin 5 of the buck-boost chip is connected to one end of the resistor R130, the other end of the resistor R130 is connected to a controller, the SDA pin 6 of the buck-boost chip is connected to one end of the resistor R131, the other end of the resistor R131 is connected to the controller, the pin 9 of the buck-boost chip is connected to one end of the resistor R133 and one end of the capacitor C117, the other end of the capacitor C117 is grounded, the other end of the resistor R133 is connected to a 3.3V voltage, and the Pin 7 of the buck-boost chip is connected to one end of the resistor R125 and one end of the capacitor C43, and the other end of the resistor R125 and the other end of the capacitor C43 are both grounded. Pin 8 of the buck-boost chip is connected to one end of the resistor R126, and the other end of the resistor R126 is connected to one end of the resistor R123 and one end of the resistor R129, and the other end of the resistor R123 is grounded. The other end of the resistor R129 is connected to the output pin 12 of the buck-boost chip, and the output pin 12 of the buck-boost chip is also connected to one end of the capacitor C23, one end of the capacitor C26, one end of the capacitor C7, One end of capacitor C115 is connected, and the other ends of capacitor C23, capacitor C26, capacitor C7, and capacitor C115 are all grounded; pin 13 of the buck-boost chip is connected to one end of resistor R124, the other end of resistor R124 is connected to one end of capacitor C32, the other end of capacitor C32 is connected to pin 14 of the buck-boost chip, pin 16 of the buck-boost chip is connected to one end of resistor R127, the other end of resistor R127 is connected to one end of capacitor C9, and the other end of capacitor C9 is connected to pin 15 of the buck-boost chip.

[0007] Wherein, the voltage doubling rectifier unit includes: a capacitor C11, one end of the capacitor C11 is connected to one end of the inductor L6 and the pin 15 of the buck-boost chip, the other end of the capacitor C11 is connected to one end of the resistor R8, the other end of the resistor R8 is connected to the anode of the diode D22 and the cathode of the diode D5; one end of the capacitor C14 is connected to the other end of the inductor L6 and the pin 14 of the buck-boost chip, the other end of the capacitor C14 is connected to one end of the resistor R40, the other end of the resistor R40 is connected to the anode of the diode D3 and the cathode of the diode D4, the anode of the diode D4 and the anode of the diode D5 are both connected to the output pin 12 of the buck-boost chip, the cathode of the diode D3 is connected to the cathode of the diode D22, one end of the capacitor C13, one end of the capacitor C16, and one end of the resistor R9, the other end of the capacitor C13 and the other end of the capacitor C16 are both grounded, the other end of the resistor R9 is connected to the cathode of the voltage-stabilizing diode Z2, and the anode of the voltage-stabilizing diode Z2 is connected to the output pin 12 of the buck-boost chip.

[0008] The conversion output unit includes: a transistor Q5, a drain of the transistor Q5 is connected to one end of the resistor R15 and one end of the resistor R39, the other end of the resistor R15 is connected to the output pin 12 of the buck-boost chip, the source of the transistor Q5 is connected to the drain of the transistor Q4 and the anode of the diode D9, the cathode of the diode D9 is connected to one end of the resistor R18, the other end of the resistor R18 is connected to the gate of the transistor Q5 and one end of the resistor R7, the other end of the resistor R7 is connected to the drain of the transistor Q8, the drain of the transistor Q8 is also connected to one end of the resistor R19, and the other end of the resistor R19 is connected to the cathode of the voltage-stabilizing diode Z2, The source of transistor Q8 is grounded, the gate of transistor Q8 is connected to one end of resistor R1 and one end of resistor R16, the other end of resistor R1 is grounded, the gate of transistor Q4 is connected to one end of resistor R14 and one end of resistor R13, the other end of resistor R14 is grounded, the other end of resistor R13 is connected to the controller and the other end of resistor R16, for receiving a custom PWM signal sent by the controller; the source of transistor Q5 is connected to the other end of resistor R39, one end of resistor R6, and one end of capacitor C10, the other end of capacitor C10 is grounded, the other end of resistor R6 is connected to one end of resistor R34, and the other end of resistor R34 is grounded.

[0009] It also includes a coding switch, which is connected to the controller and is used to convert the user's operation into a pulse coding control signal.

[0010] It also includes a display screen, which is connected to the controller and is used to display information and receive user input.

[0011] It also includes a wireless communication module, which is connected to the controller and is used for wireless data transmission.

[0012] In a second aspect, the present application provides an image acquisition device, comprising any of the above-mentioned transmittance control systems of the optical image acquisition device.

[0013] In a third aspect, the present application provides a method for controlling transmittance of an optical image acquisition device, comprising: The controller receives the control information and sends the control information to the driving circuit; The driving circuit generates a PWM signal according to the control information, and outputs the PWM signal to drive the ND glass, thereby realizing the control of multi-level ND values.

[0014] The transmittance control system and method of the optical image acquisition device of the present application embodiment have the following beneficial effects: This application realizes accurate and convenient ND value control, greatly improving the product experience. This application is a high-quality ND adjustment solution for image acquisition devices such as cameras and video cameras, providing users with a better user experience and a more friendly operating environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of the transmittance control system of the optical image acquisition device of the embodiment of the present application. Figure 1 ; Figure 2 This is a schematic diagram of the structure of the transmittance control system of the optical image acquisition device of the embodiment of the present application. Figure 2 ; Figure 3 This is a principle block diagram of a transmittance control system of an optical image acquisition device according to an embodiment of the present application; Figure 4 This is a schematic diagram of the structure of the transmittance control system of the optical image acquisition device of the embodiment of the present application. Figure 3 ; Figure 5a This is the circuit diagram of the buck-boost unit in this application; Figure 5b This is the circuit diagram of the voltage doubler rectifier unit in this application; Figure 5c This is a circuit diagram of a conversion output unit in this application; Figure 6a The three-dimensional structure of the transmittance control system of the optical image acquisition device of the embodiment of the present application Figure 1 ; Figure 6b The three-dimensional structure of the transmittance control system of the optical image acquisition device of the embodiment of the present application Figure 2 ; Figure 6c The three-dimensional structure of the transmittance control system of the optical image acquisition device of the embodiment of the present application Figure 3 ; Figure 7a Schematic diagram of the transmittance control system and lens adapter ring structure of the optical image acquisition device of the present application embodiment Figure 1 ; Figure 7b Schematic diagram of the transmittance control system and lens adapter ring structure of the optical image acquisition device of the present application embodiment Figure 2 ; Figure 8 This is a flow chart of a transmittance control method of an optical image acquisition device according to an embodiment of the present application. DETAILED DESCRIPTION

[0016] The present application is further described below in conjunction with the accompanying drawings and embodiments.

[0017] In the following introduction, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. The following introduction provides multiple embodiments of the present invention, and different embodiments can be replaced or combined, so this application can also be considered to include all possible combinations of the same and / or different embodiments recorded. Therefore, if one embodiment includes features A, B, and C, and another embodiment includes features B and D, then this application should also be considered to include embodiments containing one or more of all other possible combinations of features A, B, C, and D, even though the embodiment may not be clearly recorded in the following text.

[0018] Embodiment 1 like Figure 1 As shown, the transmittance control system of the optical image acquisition device of the present application includes: a controller 10, a driving circuit 20 and an ND glass 30; the controller 10 is used to receive control information and send the control information to the driving circuit 20; the driving circuit 20 is used to generate a PWM (Pulse Width Modulation) signal according to the control information, output the PWM signal to drive the ND glass, and realize the control of multi-level ND value.

[0019] like Figure 1-Figure 3As shown, the driving circuit 20 includes a buck-boost unit 21, a voltage doubling rectifier unit 22, and a conversion output unit 23; the buck-boost unit 21 is used to receive the voltage parameters sent by the controller, and output an adjustable voltage according to the voltage parameters; the voltage doubling rectifier unit 22 is used to double the adjustable voltage output by the buck-boost unit 21, and then output a driving voltage after filtering and voltage stabilization, and the driving voltage is used to drive the transistor of the conversion output unit 23; the conversion output unit 23 is used to: receive a first PWM signal sent by the controller 10, the first PWM signal is a custom signal, for example, the frequency and duty cycle of the first PWM signal can be customized; according to the first PWM signal, the adjustable voltage output by the buck-boost unit 21 is converted into a second PWM signal, the second PWM signal is an AC signal, the frequency and duty cycle of the second PWM signal are the same as the first PWM signal, the amplitude of the second PWM signal is the same as the adjustable voltage output by the buck-boost unit 21, and the second PWM signal is used to drive the ND glass to achieve accurate and convenient control of multi-level ND values.

[0020] This application realizes accurate and convenient ND value control, greatly improving the product experience. This application is a high-quality ND adjustment solution for image acquisition devices such as cameras and video cameras, providing users with a better user experience and a more friendly operating environment.

[0021] Embodiment 2 like Figure 4 As shown, the transmittance control system of the optical image acquisition device of the present application includes: a controller 10, a driving circuit 20 and an ND glass 30; the controller 10 is used to receive control information and send the control information to the driving circuit 20; the driving circuit 20 is used to generate a PWM signal according to the control information, output the PWM signal to drive the ND glass, and realize the control of multi-level ND values. The controller 10 is also connected to a coding switch 40, a display screen 60, and a wireless communication module 50. The coding switch 40 is used to convert the user's operation into a pulse coding control signal and send the pulse coding control signal to the controller. The display screen 60 is used to display information, receive user input, and realize interaction with the user. The wireless communication module 50 is used for wireless data transmission to realize wireless interaction with the controller. They are introduced below.

[0022] Controller The controller is an MCU (Microcontroller Unit) main control chip, which is used to control various parts of the system, as well as electrical signal conversion and collection, PWM signal output, OSC (oscillator) signal feedback detection, etc. The controller is, for example, GD32F303CCT6.

[0023] Display like Figure 6a , Figure 6cAs shown, the display screen is, for example, an OLED (Organic Light-Emitting Diode) display screen, which displays the interactive parameter values ​​operated by the user, so that the user can confirm various parameters. The display screen receives display instructions and display data from the controller via a communication bus. Through the display screen 60, the user can input custom control parameters and also obtain displayed system information.

[0024] Coding switch The code switch can control the interactive input digitization, convert the user's operation (such as rotation) into a pulse code control signal, and send the pulse code control signal to the controller, such as Figure 6b , Figure 6c As shown, SRBE110301 of CON5 (Connector 5) is a coding switch, resistors R10, R12, and R35 are pull-up resistors, capacitors C12, C39, and C44 are filter capacitors, and TVS6, TVS7, and TVS1 form an ESD (Electro-Static discharge) absorption circuit.

[0025] Drive circuit The driving circuit is a control circuit for generating and regulating the ND glass control signal, which can output a programmable voltage (up to 2048 levels), a programmable frequency and a programmable duty cycle signal to drive the ND glass. The driving circuit 20 includes a buck-boost unit 21, a voltage doubling rectifier unit 22 and a conversion output unit 23.

[0026] The buck-boost unit 21 is used to receive the voltage parameters sent by the controller and output an adjustable voltage according to the voltage parameters. Figure 5a As shown, the MP28167 chip is a buck-boost chip, and other types of chips can also be used instead. The controllable voltage is output from the output terminal "5V++O", the output voltage range is a custom range, and the output variable level is a custom controllable adjustment level. The MP28167 chip is used to receive voltage parameters from the controller from the IIC (Inter-Integrated Circuit) bus. The voltage parameters are generated by a handwheel or remote input or encoding switch input. The voltage parameters can be customized, such as 0~10V, and the custom controllable adjustment level is 0~2048 levels.

[0027] like Figure 5aAs shown, the buck-boost unit 21 includes: a buck-boost chip, a pin 1 of the buck-boost chip is connected to one end of a resistor R128, one end of a capacitor C8, one end of a capacitor C15, and one end of an inductor L9, the other end of the capacitor C8 and the other end of the capacitor C15 are both grounded, the other end of the inductor L9 is connected to a power supply, the other end of the resistor R128 is connected to an enable pin 3 of the buck-boost chip, one end of the capacitor C28, and a cathode of a diode D10, the other end of the capacitor C28 is grounded, the anode of the diode D10 is connected to one end of a resistor R4, and the other end of the resistor R4 is connected to a controller The pin 4 of the buck-boost chip is connected to one end of the resistor R132, and the other end of the resistor R132 is connected to a 3.3V voltage. The SCL pin 5 of the buck-boost chip is connected to one end of the resistor R130, and the other end of the resistor R130 is connected to the controller. The SDA pin 6 of the buck-boost chip is connected to one end of the resistor R131, and the other end of the resistor R131 is connected to the controller. The pin 9 of the buck-boost chip is connected to one end of the resistor R133 and one end of the capacitor C117. The other end of the capacitor C117 is grounded, and the other end of the resistor R133 is connected to a 3.3V voltage. The pin 7 of the buck-boost chip is connected to one end of the resistor R125 and one end of the capacitor C43, and the other end of the resistor R125 and the other end of the capacitor C43 are grounded. The pin 8 of the buck-boost chip is connected to one end of the resistor R126, and the other end of the resistor R126 is connected to one end of the resistor R123 and one end of the resistor R129. The other end of the resistor R123 is grounded, and the other end of the resistor R129 is connected to the output pin 12 of the buck-boost chip. The output pin 12 of the buck-boost chip is also connected to one end of the capacitor C23, one end of the capacitor C26, and one end of the capacitor C7. , one end of capacitor C115 is connected, the other end of capacitor C23, the other end of capacitor C26, the other end of capacitor C7, and the other end of capacitor C115 are all grounded; pin 13 of the buck-boost chip is connected to one end of resistor R124, the other end of resistor R124 is connected to one end of capacitor C32, the other end of capacitor C32 is connected to pin 14 of the buck-boost chip, pin 16 of the buck-boost chip is connected to one end of resistor R127, the other end of resistor R127 is connected to one end of capacitor C9, and the other end of capacitor C9 is connected to pin 15 of the buck-boost chip.

[0028] The voltage doubler rectifier unit 22 is used to double the adjustable voltage output by the buck-boost unit 21, and then output a driving voltage after filtering and voltage stabilization. The driving voltage is used to drive the transistor of the conversion output unit 23. Figure 5bAs shown, diodes D22, D3, D4, and D5 form a double voltage rectifier circuit, which rectifies the PWM waveform from the inductor L6. The voltage amplitude of this PWM switch waveform is proportional to the output "5V++0". After the double voltage is filtered and stabilized, a V-DIRVER voltage 5.6V higher than "5V++0" is obtained. The V-DIRVER voltage is used to drive the output push-pull MOSFET (Metal-Oxide-SemiconductorField-Effect Transistor) Q5 to work. In some embodiments, the double voltage can also be replaced by a multiple rectification method.

[0029] like Figure 5b As shown, the voltage doubler rectifier unit includes: a capacitor C11, one end of the capacitor C11 is connected to one end of the inductor L6 and the pin 15 of the buck-boost chip, the other end of the capacitor C11 is connected to one end of the resistor R8, the other end of the resistor R8 is connected to the anode of the diode D22 and the cathode of the diode D5; one end of the capacitor C14 is connected to the other end of the inductor L6 and the pin 14 of the buck-boost chip, the other end of the capacitor C14 is connected to one end of the resistor R40, the other end of the resistor R40 is connected to the anode of the diode D3 and the cathode of the diode D4, the anode of the diode D4 and the anode of the diode D5 are both connected to the output pin 12 of the buck-boost chip, the cathode of the diode D3 is connected to the cathode of the diode D22, one end of the capacitor C13, one end of the capacitor C16, and one end of the resistor R9, the other end of the capacitor C13 and the other end of the capacitor C16 are both grounded, the other end of the resistor R9 is connected to the cathode of the voltage zener diode Z2, and the anode of the voltage zener diode Z2 is connected to the output pin 12 of the buck-boost chip.

[0030] The conversion output unit 23 is used to: receive a first PWM signal sent by the controller 10, the first PWM signal is a customized signal, for example, the frequency and duty cycle of the first PWM signal can be customized; according to the first PWM signal, the adjustable voltage output by the buck-boost unit 21 is converted into a second PWM signal, the second PWM signal is an AC signal, the frequency and duty cycle of the second PWM signal are the same as the first PWM signal, the amplitude of the second PWM signal is the same as the adjustable voltage output by the buck-boost unit 21, and the second PWM signal is used to drive the ND glass to achieve accurate and convenient control of multi-level ND values.

[0031] Receive the DISPLAY_PWM signal (first PWM signal) from the controller. The frequency and duty cycle of the first PWM signal can be customized, for example, the frequency can be customized to 1KHz and the duty cycle can be customized to 50%. The first PWM signal converts the "5V++O" controllable DC voltage from the buck-boost unit into a PWM AC signal (second PWM signal) through MOSFET transistors Q4, Q5 and Q8. The frequency and duty cycle of the output PWM AC signal are the same as the DISPLAY_PWM signal, and the amplitude of the output PWM AC signal is the same as the "5V++O" voltage value. The output PWM AC signal is output from the "LCT-198B+" to drive the ND glass sheet, realizing accurate and convenient control of multi-level ND values.

[0032] like Figure 5c As shown, the conversion output unit includes: a transistor Q5, the drain of the transistor Q5 is connected to one end of the resistor R15 and one end of the resistor R39, the other end of the resistor R15 is connected to the output pin 12 of the buck-boost chip, the source of the transistor Q5 is connected to the drain of the transistor Q4 and the anode of the diode D9, the cathode of the diode D9 is connected to one end of the resistor R18, the other end of the resistor R18 is connected to the gate of the transistor Q5 and one end of the resistor R7, the other end of the resistor R7 is connected to the drain of the transistor Q8, the drain of the transistor Q8 is also connected to one end of the resistor R19, the other end of the resistor R19 is connected to the cathode of the voltage-stabilizing diode Z2, the transistor Q5 is connected to the drain of the transistor Q5 and one end of the resistor R7, the transistor Q5 is connected to the drain of the transistor Q8 and the drain of the transistor Q8 is also connected to one end of the resistor R19, the other end of the resistor R19 is connected to the cathode of the voltage-stabilizing diode Z2, the transistor Q5 is connected to the drain of the transistor Q5 and one end of the resistor R19, the transistor Q5 is connected to the drain of the transistor Q8 and the gate of the transistor Q5 and the gate of the transistor Q5. The source of transistor Q8 is grounded, the gate of transistor Q8 is connected to one end of resistor R1 and one end of resistor R16, the other end of resistor R1 is grounded, the gate of transistor Q4 is connected to one end of resistor R14 and one end of resistor R13, the other end of resistor R14 is grounded, the other end of resistor R13 is connected to the controller and the other end of resistor R16, for receiving the custom PWM signal sent by the controller; the source of transistor Q5 is connected to the other end of resistor R39, one end of resistor R6, and one end of capacitor C10, the other end of capacitor C10 is grounded, the other end of resistor R6 is connected to one end of resistor R34, the other end of resistor R34 is grounded. The OSC signal sampling point is located between resistor R6 and resistor R34.

[0033] DISPLAY_PWM, voltage, frequency, duty cycle and switch working signals are provided to the controller, which receives control data generated by the handwheel or remote input or encoder switch input, thereby realizing multi-level precise ND value control. The OSC signal is sampled from the output end and transmitted back to the controller to realize closed-loop signal sampling and output precise control.

[0034] Wireless communication module The wireless communication module in the present application is, for example, a ZigBee communication module. Through the wireless communication module, the user can interact with the controller wirelessly, send control information to the controller, complete the system's functional control and data upload and exchange, and can also perform OTA (Over-the-Air Technology) software updates of the product through the wireless communication module.

[0035] The transmittance control system of the optical image acquisition device of the present application also includes: a TYPE-C interface 70, which supports standard TYPE-C power supply, and the input voltage range is: 5V~18V, such as Figure 6c As shown, in the TYPE-C interface circuit, the switch circuit and the protection circuit are multiplexed to ensure the safety of the input voltage, and the DC-DC input VBUS_PWR is connected after the switch.

[0036] The transmittance control system of the optical image acquisition device of the present application also includes: a voltage stabilization circuit, the chip ETA2821 is used to stabilize the input voltage to 4.72V, and the 4.72V is converted into 3.3V by the LDO of each channel for use by various circuits of the system. The control system of the present application includes multiple LDO (Low Dropout Regulator, low voltage difference linear regulator) step-down chips to provide 3.3V regulated voltage for each chip.

[0037] like Figure 7a , Figure 7b As shown, the transmittance control system 100 of the optical image acquisition device of the present application is used in conjunction with a lens adapter ring portion 110 (eg, an E-PL adapter ring), and the transmittance control system 100 of the optical image acquisition device of the present application can be removed.

[0038] In response to the noise and vibration problems that occur during the ND value control process, this application introduces coded sampling and PWM pulse control technology to effectively avoid harmful noise and vibration that may be generated during operation. Through the control system of this application, users can achieve fine control of multi-level ND value gears, thereby achieving a more accurate and smooth operating experience. The solution of this application not only improves the comfort of equipment operation, but also improves image quality and stability, bringing photographers a more creative shooting environment, providing users with a more convenient and efficient operation method, and bringing greater inspiration and possibilities for photographic creation.

[0039] The control system of this application has a multi-level control function, which makes the control of the ND value close to stepless and precise control, with the number of levels as high as 2048, realizing digital controllable parameter adjustment, thereby achieving seamless switching of the picture. Through this advanced control method, users can achieve more subtle and precise ND value adjustment, making the light changes transition more naturally, the picture performance more smooth, and presenting a more delicate light and shadow effect. The solution of this application supports continuous and smooth transitions, eliminating the obvious jumps between different gears of traditional ND filters, providing photographers with a more flexible and seamless shooting experience, and fully demonstrating the true charm of photography art.

[0040] The present application also provides an image acquisition device, comprising any one of the above-mentioned optical image acquisition device transmittance control systems.

[0041] Embodiment 3 The present application also provides a method for controlling the transmittance of an optical image acquisition device, such as Figure 8 As shown, it includes: S101, the controller receives control information and sends the control information to the driving circuit; S103, the driving circuit generates a PWM signal according to the control information, outputs the PWM signal to drive the ND glass, and realizes the control of multi-level ND value.

[0042] In the present application, the embodiment of the transmittance control method of the optical image acquisition device is basically similar to the embodiment of the transmittance control system of the optical image acquisition device. For relevant matters, please refer to the introduction of the embodiment of the transmittance control system of the optical image acquisition device.

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

Claims

1. A transmittance control system for an optical image acquisition device, characterized in that: include: A controller, a driving circuit and an ND glass; the controller is used to receive control information and send the control information to the driving circuit; The driving circuit is used to generate a PWM signal according to the control information, and output the PWM signal to drive the ND glass to achieve multi-level ND value control.

2. The transmittance control system of the optical image acquisition device according to claim 1, characterized in that: The driving circuit includes a step-up and step-down unit, a voltage doubler and rectifier unit, and a conversion and output unit; The buck-boost unit is used to receive the voltage parameters sent by the controller and output an adjustable voltage according to the voltage parameters; The voltage doubling rectifier unit is used to double the adjustable voltage output by the buck-boost unit, and then output a driving voltage after filtering and voltage stabilization, and the driving voltage is used to drive the transistor of the conversion output unit; The conversion output unit is used to: receive a first PWM signal sent by the controller, the first PWM signal is a custom signal; convert the adjustable voltage output by the buck-boost unit into a second PWM signal according to the first PWM signal, the second PWM signal is an AC signal, the frequency and duty cycle of the second PWM signal are the same as those of the first PWM signal, and the amplitude is the same as the adjustable voltage output by the buck-boost unit, and the second PWM signal is used to drive the ND glass to achieve multi-level ND value control.

3. The transmittance control system of the optical image acquisition device according to claim 2, characterized in that: The buck-boost unit comprises: a buck-boost chip, wherein a pin 1 of the buck-boost chip is connected to one end of a resistor R128, one end of a capacitor C8, one end of a capacitor C15, and one end of an inductor L9, the other end of the capacitor C8 and the other end of the capacitor C15 are both grounded, the other end of the inductor L9 is connected to a power supply, the other end of the resistor R128 is connected to an enable pin 3 of the buck-boost chip, one end of the capacitor C28, and a cathode of a diode D10, the other end of the capacitor C28 is grounded, the anode of the diode D10 is connected to one end of a resistor R4, and the other end of the resistor R4 is connected to a controller; Pin 4 of the buck chip is connected to one end of the resistor R132, and the other end of the resistor R132 is connected to a 3.3V voltage. The SCL pin 5 of the buck-boost chip is connected to one end of the resistor R130, and the other end of the resistor R130 is connected to the controller. The SDA pin 6 of the buck-boost chip is connected to one end of the resistor R131, and the other end of the resistor R131 is connected to the controller. The pin 9 of the buck-boost chip is connected to one end of the resistor R133 and one end of the capacitor C117, and the other end of the capacitor C117 is grounded. The other end of the resistor R133 is connected to a 3.3V voltage. Pin 7 of the buck-boost chip is connected to one end of the resistor R125 and one end of the capacitor C43, and the other end of the resistor R125 and the other end of the capacitor C43 are grounded. Pin 8 of the buck-boost chip is connected to one end of the resistor R126, and the other end of the resistor R126 is connected to one end of the resistor R123 and one end of the resistor R129, and the other end of the resistor R123 is grounded. The other end of the resistor R129 is connected to the output pin 12 of the buck-boost chip, and the output pin 12 of the buck-boost chip is also connected to one end of the capacitor C23, one end of the capacitor C26, one end of the capacitor C7, and the capacitor C8. One end of capacitor C115 is connected, the other ends of capacitor C23, the other ends of capacitor C26, the other ends of capacitor C7 and the other end of capacitor C115 are all grounded; pin 13 of the buck-boost chip is connected to one end of resistor R124, the other end of resistor R124 is connected to one end of capacitor C32, the other end of capacitor C32 is connected to pin 14 of the buck-boost chip, pin 16 of the buck-boost chip is connected to one end of resistor R127, the other end of resistor R127 is connected to one end of capacitor C9, and the other end of capacitor C9 is connected to pin 15 of the buck-boost chip.

4. The transmittance control system of the optical image acquisition device according to claim 3, characterized in that: The voltage doubling rectifier unit includes: a capacitor C11, one end of the capacitor C11 is connected to one end of the inductor L6 and the pin 15 of the buck-boost chip, the other end of the capacitor C11 is connected to one end of the resistor R8, the other end of the resistor R8 is connected to the anode of the diode D22 and the cathode of the diode D5; one end of the capacitor C14 is connected to the other end of the inductor L6 and the pin 14 of the buck-boost chip, the other end of the capacitor C14 is connected to one end of the resistor R40, the other end of the resistor R40 is connected to the anode of the diode D3 and the cathode of the diode D4, the anode of the diode D4 and the anode of the diode D5 are both connected to the output pin 12 of the buck-boost chip, the cathode of the diode D3 is connected to the cathode of the diode D22, one end of the capacitor C13, one end of the capacitor C16, and one end of the resistor R9, the other end of the capacitor C13 and the other end of the capacitor C16 are both grounded, the other end of the resistor R9 is connected to the cathode of the voltage stabilizing diode Z2, and the anode of the voltage stabilizing diode Z2 is connected to the output pin 12 of the buck-boost chip.

5. The transmittance control system of the optical image acquisition device according to claim 4, characterized in that: The conversion output unit includes: a transistor Q5, the drain of the transistor Q5 is connected to one end of the resistor R15 and one end of the resistor R39, the other end of the resistor R15 is connected to the output pin 12 of the buck-boost chip, the source of the transistor Q5 is connected to the drain of the transistor Q4 and the anode of the diode D9, the cathode of the diode D9 is connected to one end of the resistor R18, the other end of the resistor R18 is connected to the gate of the transistor Q5 and one end of the resistor R7, the other end of the resistor R7 is connected to the drain of the transistor Q8, the drain of the transistor Q8 is also connected to one end of the resistor R19, the other end of the resistor R19 is connected to the cathode of the voltage-stabilizing diode Z2, the transistor Q5 is connected to the drain of the transistor Q8, and the transistor Q8 is connected to one end of the resistor R19. The source of transistor Q8 is grounded, the gate of transistor Q8 is connected to one end of resistor R1 and one end of resistor R16, the other end of resistor R1 is grounded, the gate of transistor Q4 is connected to one end of resistor R14 and one end of resistor R13, the other end of resistor R14 is grounded, the other end of resistor R13 is connected to the controller and the other end of resistor R16, for receiving a custom PWM signal sent by the controller; the source of transistor Q5 is connected to the other end of resistor R39, one end of resistor R6, and one end of capacitor C10, the other end of capacitor C10 is grounded, the other end of resistor R6 is connected to one end of resistor R34, and the other end of resistor R34 is grounded.

6. The transmittance control system of the optical image acquisition device according to any one of claims 1 to 5, characterized in that: It also includes a coding switch, which is connected to the controller and is used to convert the user's operation into a pulse coding control signal.

7. The transmittance control system of the optical image acquisition device according to any one of claims 1 to 5, characterized in that: It also includes a display screen, which is connected to the controller and is used to display information and receive user input.

8. The transmittance control system of the optical image acquisition device according to any one of claims 1 to 5, characterized in that: It also includes a wireless communication module, which is connected to the controller and is used for wireless data transmission.

9. An image acquisition device, characterized in that: The invention comprises the transmittance control system of the optical image acquisition device according to any one of claims 1 to 8.

10. A method for controlling transmittance of an optical image acquisition device, characterized in that: include: The controller receives the control information and sends the control information to the driving circuit; The driving circuit generates a PWM signal according to the control information, and outputs the PWM signal to drive the ND glass, thereby realizing the control of multi-level ND values.

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