A photosensitive device

Abstract

The application discloses a photosensitive device, which comprises an adjustable optical module, a fixed optical module, a supporting module and a sensor module; the adjustable optical module, the fixed optical module, the supporting module and the sensor module are sequentially assembled together in an axial direction. The adjustable optical module comprises a liquid lens module, which is used for realizing automatic focal length adjustment. An electric connecting wire and a conductive connecting body for connecting with electrodes of the liquid lens are both made of a flexible circuit material which can be folded and does not affect electrical connection. The automatic focal length adjustment photosensitive device provided by the application is based on a liquid lens and does not comprise a motor, so that the photosensitive device has low power consumption and small size. The conductive connecting body of the liquid lens is improved, so that the selection of the material of the conductive connecting body is limited, and the manufacturing and installation difficulty and cost are reduced, thereby reducing the manufacturing cost of the whole device.

Description

Technical Field

[0001] This invention relates to the field of photoelectric conversion, and more particularly to a photosensitive device. Background Technology

[0002] A photosensitive device can detect light emitted or reflected by external objects and convert the light into electrical signals, thereby obtaining image information of the observed object. Some photosensitive devices can process image information to obtain the content of one-dimensional or two-dimensional codes in the image, the position (or coordinates) of the target of interest in the image, or the content of characters in the image (Optical Character Recognition or OCR). Therefore, photosensitive devices all have a window for receiving light signals from external objects. This photosensitive device can also be called a smart camera, barcode reader, etc.

[0003] Currently, the image acquisition devices described above are widely used in technologies such as barcode scanning and optical character recognition. Based on whether the focusing position can be changed, image acquisition devices can be divided into two types: fixed focusing position and variable focusing position. Compared to a fixed focusing position, a variable focusing position allows for a greater depth of field, resulting in higher image clarity.

[0004] To achieve variable focus position, components such as voice coil motors (VCMs), piezoelectric motors, and stepper motors are typically used to move the lens.

[0005] Each of these technologies has its own advantages and disadvantages. For example, the most widely used voice coil motor technology is low cost and high speed, but it has high power consumption, short lifespan, poor vibration resistance, and hysteresis. While piezoelectric motor technology is fast and has no hysteresis, its cost is too high, and its lifespan is also short. Stepper motor technology is highly reliable, but it is large, slow to respond, and consumes a lot of power.

[0006] In conclusion, image acquisition devices that achieve greater depth of field through mechanical movement always have various shortcomings and cannot achieve satisfactory results.

[0007] In recent years, liquid lens technology has moved from research to practical application. Compared with the technologies mentioned above, liquid lenses offer several advantages. These advantages primarily include low power consumption, high speed, small size, high reliability, absence of hysteresis, and the absence of moving parts. Furthermore, with the continuous maturation of manufacturing processes, the cost of mass production has decreased to an acceptable level. Therefore, image acquisition devices employing liquid lens technology offer better performance and higher stability compared to traditional devices.

[0008] A liquid lens is created by bringing two immiscible liquids with different refractive indices into contact. By using external parameters to alter the interface shape between the two liquids, the optical parameters (such as focal length) of the liquid lens can be changed, ultimately altering the optical path length of light traveling through the liquid lens. External parameters that can change the optical parameters of a liquid lens include pressure, voltage, and current.

[0009] Existing technologies include image capture modules and devices based on liquid lenses, where a conductor in electrical contact with the liquid lens also serves as an aperture. This leads to limitations in the selection of materials for the conductor and increases the difficulty of its fabrication. Furthermore, since the conductor acts as an aperture, the precision required for its installation position is significantly increased to prevent aperture misalignment. Therefore, this patent employs a complex design for the conductor to simultaneously meet the fabrication and installation requirements of both the conductor and the aperture. However, this structural design results in excessively high costs during fabrication and installation.

[0010] Therefore, those skilled in the art are dedicated to developing a photosensitive device that also uses a liquid lens to achieve automatic focal length adjustment. However, the function of the conductor is separated to reduce the manufacturing and installation costs of the conductor, thus significantly reducing the overall cost of the device. Summary of the Invention

[0011] In view of the above-mentioned deficiencies of the prior art, the technical problem to be solved by the present invention is how to reduce the difficulty of material selection, processing and installation of the conductive connector of the liquid lens in the automatic focal length adjustment photosensitive device based on the liquid lens, so as to simplify the structure and reduce the overall manufacturing cost of the photosensitive device.

[0012] To achieve the above objectives, the present invention provides a photosensitive device including an adjustable optical module, characterized in that the adjustable optical module includes a liquid lens module, the liquid lens module being configured to adjust the focal length.

[0013] Furthermore, the liquid lens module includes a liquid lens and an electrical connection wire, the electrical connection wire being connected to an electrode on the liquid lens.

[0014] Furthermore, the liquid lens includes a first electrode and a second electrode; the electrical connection line includes a first conductive connector and a second conductive connector; the first conductive connector is connected to the first electrode, and the second conductive connector is connected to the second electrode.

[0015] Furthermore, at least one of the first conductive connector and the second conductive connector is made of a foldable conductive flexible material.

[0016] Furthermore, at least one of the first conductive connector and the second conductive connector is annular, and its annular inner diameter is not less than the light-transmitting aperture of the liquid lens.

[0017] Furthermore, at least one of the first conductive connector and the second conductive connector is C-shaped.

[0018] Furthermore, it also includes a fixed optical module, a support module, and a sensor module; the adjustable optical module, the fixed optical module, the support module, and the sensor module are sequentially assembled axially together.

[0019] Furthermore, the support module includes an optical support base, which includes a support base opening.

[0020] Furthermore, the opening in the support base is a circular hole, and the diameter of the opening in the support base is not less than the light-transmitting aperture of the liquid lens, and the diameter of the opening in the support base is not less than the light-transmitting aperture of the fixed optical module.

[0021] Furthermore, both the adjustable optical module and the fixed optical module are connected to the first end of the optical support, with the fixed optical module located between the adjustable optical module and the optical support; the sensor module is connected to the second end of the optical support; the adjustable optical module, the fixed optical module, and the optical support are optically connected, allowing light from the object to be observed to pass sequentially through the adjustable optical module, the fixed optical module, and the optical support, thereby being received by the sensor module.

[0022] Furthermore, it also includes a fastening device, wherein both the adjustable optical module and the fixed optical module are disposed between the fastening device and the optical support, so that the adjustable optical module and the fixed optical module are fixed on the optical support.

[0023] Furthermore, the fastening device is annular, the inner diameter of the fastening device is not less than the light-transmitting aperture of the liquid lens, the inner diameter of the fastening device is not less than the light-transmitting aperture of the fixed optical module, and the inner diameter of the fastening device is not greater than the outer diameter of the adjustable optical module.

[0024] Furthermore, an annular washer is provided between the fastening device and the adjustable optical module.

[0025] Furthermore, the fastening device includes a locking ring, the outer surface of which is provided with an external thread, and the inner surface of the support seat opening is provided with an internal thread. The locking ring and the optical support seat are connected by a threaded engagement.

[0026] Furthermore, the locking ring is a non-closed ring, and an annular groove is provided on the inner surface of the opening of the support seat, and the locking ring is disposed within the annular groove.

[0027] Furthermore, the fastening device is a lens cover ring, which has a central opening. The central opening is circular, and its diameter is not less than the opening diameter of the support seat of the liquid lens, the diameter of the central opening is not less than the opening diameter of the support seat of the fixed optical module, and the diameter of the central opening is not greater than the outer diameter of the adjustable optical module.

[0028] Furthermore, a side opening is provided on the side of the lens cover ring. The side opening is elongated, and its length is greater than the width of the electrical connection wire, while its width is greater than the thickness of the electrical connection wire.

[0029] Furthermore, it also includes a lighting circuit module disposed on the support module, the lighting circuit module including multiple light-emitting elements.

[0030] Furthermore, the light-emitting element emits light in one or more of the visible, infrared, or ultraviolet bands.

[0031] Furthermore, the light-emitting elements include an illumination LED, a targeting LED, and a reading LED.

[0032] This invention has at least the following technical effects:

[0033] 1. The automatic focus-adjusting photosensitive device provided by the present invention is based on a liquid lens and does not include a motor. Therefore, the power consumption of the entire photosensitive device is low and the size is small.

[0034] 2. The entire device of the present invention does not contain any moving parts, therefore it has high reliability and can be used in vibration environments.

[0035] 3. This invention can achieve a greater depth of field by automatically adjusting the focal length or focusing at multiple positions.

[0036] 4. This invention improves the conductive connector of the liquid lens, eliminating the need for the conductive connector to simultaneously function as an aperture stop. This reduces limitations on the material selection for the conductive connector, lowers the difficulty and cost of manufacturing and installation, and consequently reduces the overall manufacturing cost of the device.

[0037] 5. The present invention provides various implementation methods for liquid lens fastening devices, which can make the structure of the entire device more compact and further reduce the overall volume of the device.

[0038] The following will further explain the concept, specific structure, and technical effects of the present invention in conjunction with the accompanying drawings, so as to fully understand the purpose, features, and effects of the present invention. Attached Figure Description

[0039] Figure 1 This is a functional module diagram of an embodiment of the present invention;

[0040] Figure 2 This is a schematic diagram of the circuit module of an image acquisition device according to an embodiment of the present invention;

[0041] Figure 3 This is an exploded structural diagram of an embodiment of the present invention;

[0042] Figure 4 This is a schematic diagram of an assembly according to an embodiment of the present invention;

[0043] Figure 5 This is a schematic diagram of one embodiment of the liquid module of the present invention;

[0044] Figure 6 This is a schematic diagram of one embodiment of the liquid lens of the present invention;

[0045] Figure 7 This is a partial structural schematic diagram of one embodiment of the electrical connection wire of the present invention;

[0046] Figure 8 This is an exploded structural diagram of another embodiment of the present invention;

[0047] Figure 9 This is an exploded structural diagram of another embodiment of the present invention;

[0048] Figure 10 This is an exploded structural diagram of another embodiment of the present invention;

[0049] Among them, 1-liquid lens, 101-first electrode, 102-second electrode, 2-lens mount, 20-support base opening, 21-side opening, 22-center opening, 23-lens cover ring, 3-electrical connection wire, 30-flexible circuit, 31-first conductor opening, 32-second conductor opening, 4-locking ring, 40-washer, 5-optical support, 6-image sensor circuit module, 7-illumination circuit module, 8-processor circuit module, 9-liquid lens drive circuit module, 10-interface circuit module, 11-first fastening screw, 12-liquid lens module, 13-second fastening screw, 14-image sensor, 15-fixed lens module, 16-illumination LED, 17-aiming LED, 18-reading LED, 50-image acquisition engine module, 51-image acquisition engine connector. Detailed Implementation

[0050] The following description, with reference to the accompanying drawings, illustrates several preferred embodiments of the present invention to make its technical content clearer and easier to understand. The present invention can be embodied in many different forms, and the scope of protection of the present invention is not limited to the embodiments mentioned herein.

[0051] In the accompanying drawings, components with the same structure are indicated by the same numerical designation, and components with similar structures or functions are indicated by similar numerical designations. The dimensions and thicknesses of each component shown in the drawings are arbitrary, and the present invention does not limit the dimensions and thicknesses of each component. To make the illustrations clearer, the thickness of some components has been appropriately exaggerated in the drawings.

[0052] like Figure 1 As shown, the photosensitive device provided by the present invention includes an adjustable optical module, a fixed lens module 15, and an image sensor circuit module 6. In this embodiment, the adjustable optical module is a liquid lens module 12. The liquid lens module 12, the fixed lens module 15, and the image sensor circuit module 6 are arranged sequentially along the axial direction of the optical path. Light emitted / reflected by the object to be observed passes sequentially through the liquid lens module 12 and the fixed lens module 15, and finally reaches the image sensor circuit module 6. In other embodiments, the light emitted / reflected by the object to be observed can also first pass through the fixed lens module 15, then through the liquid lens module 12, and finally reach the image sensor circuit module 6, achieving the same technical effect.

[0053] The present invention also includes a processor circuit module 8, a liquid lens driving circuit module 9, and an interface circuit module 10. The processor circuit module 8 includes processing circuitry responsible for all data calculations and processing. The processor circuit module 8 is connected to the image sensor circuit module 6, storing and processing the image data acquired by the image sensor circuit module 6; the processor circuit module 8 is connected to the liquid lens driving circuit module 9, adjusting the parameters of the liquid lens module 12 through the liquid lens driving circuit module 9; and the processor circuit module 8 is connected to the interface circuit module 10, transmitting instructions and data through the interface circuitry.

[0054] Figure 2 The following is a more specific circuit control block diagram of the present invention. The image acquisition module includes a liquid lens driving circuit module 9, an image sensor circuit module 6, and an illumination circuit module 7, all of which are controlled by the processor circuit module 8.

[0055] The processor circuit module 8 communicates with the liquid lens drive circuit module 9 to send instructions on changing the optical parameters of the liquid lens.

[0056] The processor circuit module 8 communicates with the image sensor circuit module 6, controlling the image sensor to operate and acquire image signals via instructions or I / O signals. The acquired image signals are then transmitted back to the processor circuit module 8.

[0057] The processor circuit module 8 and the interface circuit module 10 communicate with external wired interface modules, including external computers, PLCs, and other industrial controllers, through the interface circuit module 10. Wired communication methods include Ethernet, USB, RS232, or RS485.

[0058] The processor circuit module 8 also communicates with the wireless communication module, and communicates with the outside world through wireless communication methods such as Bluetooth and WIFI.

[0059] The processor circuit module 8 also includes a module for decoding or processing image data. In one embodiment, the processor circuit module 8 does not directly process image data, but only controls and sets the various other modules, and transmits the image data to an external device for data calculation and processing. In this case, the processor circuit module 8 may not include a module for decoding or processing image data.

[0060] The processor circuit module 8 also communicates with a user feedback circuit that provides feedback to the device operator on the device's operating status (such as decoding results, processing status, etc.). This feedback includes optical signal feedback and / or audio signal feedback.

[0061] The processor circuit module 8 also communicates with input / output modules, including a display and a keyboard.

[0062] The processor circuit module 8 also communicates with the power management circuit module.

[0063] The fixed lens module 15 and the liquid lens module 12 constitute an imaging optical system. After the position of this optical system and the image sensor 14 within the photosensitive device is determined, the focusing position (or optimal imaging distance) of the photosensitive device's optical system is also determined when a constant voltage is applied to the liquid lens. The processor writes different values ​​to the driving chip of the liquid lens, changing the output voltage of the driving chip, thereby changing the curvature of the liquid lens and the focal length of the photosensitive device's optical system, ultimately resulting in a change in the focusing position (or optimal imaging distance) of the photosensitive device. There is a one-to-one correspondence between the values ​​written to the driving chip and the focusing position (or optimal imaging distance) of the photosensitive device. Therefore, a lookup table can be generated in the processor's software to describe this correspondence; for example, a working distance of 100mm corresponds to a written value from the driving chip. Thus, the software only needs to call the parameter with the distance value 100 to adjust the focusing position (or optimal imaging distance) of the photosensitive device to 100mm.

[0064] Those skilled in the art will understand that it is not necessary to include all of the above-described modules in the image acquisition device, and on the other hand, other modules can be included in the image acquisition device.

[0065] Example 1

[0066] A schematic diagram of an embodiment of the present invention is shown below. Figure 3 As shown. For the photosensitive device of the present invention, it is positioned close to the object to be observed (located in...). Figure 3 The position at the lower left of the object being observed is the front, and the position furthest from the object being observed is the rear. In this embodiment, the locking ring 4, liquid lens module 12, fixed lens module 15, optical support 5, and image sensor circuit module 6 are arranged axially in sequence. The locking ring 4 is located at the very front. The shape of the optical support 5 can be a cube or any other shape that does not affect the installation of other components. The material of the optical support 5 can be metal or a plastic material with a certain supporting strength. The specific structure of the liquid lens module 12 used in this embodiment is as follows: Figure 5 , Figure 6 As shown. The liquid lens module 12 includes a liquid lens 1, a lens mount 2, and an electrical connection cable 3.

[0067] The optical support 5 has a support opening 20. The fixed lens module 15 is mounted from the front into the support opening 20 via a thread or sliding mechanism. The liquid lens module 12 is also mounted on the optical support 5 and positioned in front of the fixed lens module 15. A locking ring 4 is also mounted on the optical support 5 and positioned in front of the liquid lens module 12 to press the liquid lens module 12 firmly, preventing it from moving or rotating. In this embodiment, the support opening 20 is circular. To ensure that light propagation within the device is not affected, the diameter of the support opening 20 is not smaller than the aperture of the liquid lens 1 and not smaller than the aperture of the fixed lens module 15. In other embodiments, the support opening 20 may also have other shapes, but the same principle applies: the support opening 20 must not affect light propagation within the device.

[0068] The locking ring 4 has an opening in the center. Preferably, the opening is circular, but it can also be square or other shapes. To ensure that the propagation of light within the device is not affected, the opening is preferably larger than the aperture of the liquid lens 1. In one embodiment, it can also be smaller than the aperture of the liquid lens 1. To ensure that the liquid lens module 12 can be fixed, the inner diameter of the opening in the locking ring 4 is not greater than the maximum diameter of the liquid lens module 12.

[0069] In one embodiment, the outer surface of the locking ring 4 is provided with threads, and the inner surface of the support opening 20 of the optical support 5 is provided with internal threads. The locking ring 4 is connected to the optical support 5 by means of threads.

[0070] In another embodiment, the locking ring 4 is a flat annular shape. When an external force is applied to the locking ring 4 from the outside in, the locking ring 4 can undergo slight deformation, i.e., its diameter decreases. The inner diameter of the support opening 20 of the optical support 5 is slightly smaller than the outer diameter of the locking ring 4. Applying appropriate external force to the locking ring 4 allows it to be installed into the support opening 20 of the optical support 5. An annular groove (not shown in the diagram) is provided on the inner surface of the support opening 20. The diameter of the annular groove matches the outer diameter of the locking ring 4. After the external force is removed, the diameter of the locking ring 4 can return to its original size. This allows the locking ring 4 to be installed within the annular groove. Preferably, an elastic annular washer can be provided between the locking ring 4 and the liquid lens module 12. Alternatively, the locking ring 4 can also be an incomplete annular shape, i.e., a "C" shape, as long as its outer diameter can be slightly reduced by external force and can return to its original outer diameter after the external force is removed.

[0071] Image sensor 14 is soldered onto image sensor circuit module 6, which is fixed to the back of optical support 5 by a second fastening screw 13. The photosensitive surface of image sensor 14 faces optical support 5 to receive light emitted / reflected by the object being observed. Image sensor 14 can be a CCD chip or a CMOS image sensor; it can be a linear array sensor or an area array sensor; it can be a monochrome (or black and white) sensor or a color sensor.

[0072] The liquid lens driving circuit module 9 can be integrated onto the image sensor circuit module 6 or the processor circuit module 8, or it can be a separate circuit module. The liquid lens module 12 is connected to the liquid lens driving circuit module 9 via an electrical connection line 3. Preferably, the electrical connection line 3 is a flexible printed circuit board or a flexible flat cable. The liquid lens driving circuit module 9 mainly includes a driving chip. The driving chip has an SPI or I2C interface, enabling it to communicate with the processor, receive processor instructions, and convert the instructions into voltage. This voltage will be applied to the liquid lens 1. Preferably, the driving chip is a MAX14574 from MAXIM or an HV892 from Supertex.

[0073] The processor circuit module 8 communicates with the image sensor circuit module 6 and the liquid lens driving circuit module 9. Optionally, the processor circuit module 8 acquires image information from the image sensor circuit module 6 and performs image processing for recognizing barcodes, QR codes, or character recognition, etc. The processing results are then sent to external devices via the interface circuit module 10. Preferably, the processor circuit module 8 and the image sensor circuit module 6 are arranged perpendicularly to each other. The interface circuit module 10 has commonly used device interfaces such as Ethernet, RS232, and USB. In some embodiments, the processor circuit module 8 and the image sensor circuit module 6 are integrated together.

[0074] like Figure 4As shown, this embodiment also includes an illumination circuit module 7. The illumination circuit module 7 is fixed to the front of the optical support 5 by a first fastening screw 11. The illumination circuit module includes multiple light-emitting elements. In this embodiment, the light-emitting elements include an illumination LED 16, which is used to illuminate the object to be observed. Optionally, it also includes an aiming LED 17 and a reading LED 18. Both the aiming LED 17 and the reading LED 18 are located on the illumination circuit module 7. The aiming LED 17 makes it easier for the operator of the image acquisition device to find the optical center of the device; the reading LED 18 allows the operator of the image acquisition device to know that the decoding or OCR operation has been completed. Preferably, the illumination circuit module 7 is arranged in parallel with the image sensor circuit module 6. The number of illumination LEDs 16 can be one or multiple LEDs. They can be visible light LEDs, infrared LEDs, or ultraviolet LEDs. The aiming LED 17 and the reading LED 18 are visible light LEDs. In other embodiments, the light-emitting elements can also be other light-emitting bodies capable of achieving the corresponding effects.

[0075] In this embodiment, the fixed lens module 15 and the liquid lens module 12 constitute an imaging optical system. The aperture of the optical system is located on the fixed lens module 15, and can be located in front of the fixed lens module 15, or in the middle or behind the fixed lens module 15.

[0076] In this embodiment, the liquid lens 1 is provided with two electrodes: a first electrode 101 and a second electrode 102. Two conductive connectors are provided on the electrical connection line 3, corresponding to and in contact with the first electrode 101 and the second electrode 102, respectively. It should be noted that the term "contact" here refers only to maintaining an electrical connection, and not necessarily physical contact. Figure 7 As shown, in one embodiment, the conductive connectors connected to the electrodes are all annular. Specifically, the first conductive connector has a first conductive opening 31, and the second conductive connector has a second conductive opening 32. Preferably, the first conductive opening 31 and the second conductive opening 32 are circular holes with a diameter not less than the light-transmitting aperture of the liquid mirror 1, so as to avoid affecting the light emitted / reflected by the object to be observed from entering the photosensitive device. The first conductive opening 31 and the second conductive opening 32 can also be square or other shapes.

[0077] In another embodiment, the conductive connector is an open ring, i.e., "C"-shaped. It is sufficient to ensure good electrical contact between the conductive connector and the first electrode 101 and the second electrode 102.

[0078] Since the conductive connector of this invention does not need to simultaneously function as an aperture stop, and its installation position accuracy requirement is much lower than that of an aperture stop, both the first and second conductive connectors in this embodiment can be made of the same flexible material as the flexible circuit 30. This reduces the difficulty of building and installing the entire optical path, thereby reducing the overall cost of the entire photosensitive device.

[0079] Example 2

[0080] Another preferred embodiment of the present invention has the following structure: Figure 8 As shown. In this embodiment, the liquid lens module 12 is disposed behind the lens cover ring 23. The lens cover ring 23 is provided with a central opening 22. Preferably, the central opening 22 is circular, and its inner diameter is larger than the light-transmitting aperture of the liquid lens 1. The central opening 22 can also be square or other shapes, but it is still necessary to ensure that it does not affect the passage of light emitted / reflected by the object being observed through the liquid lens 1.

[0081] The lens cover ring 23 has a side opening 21 on its side. The electrical connection cable 3 connected to the liquid lens module 12 can pass through the side opening 21. The side opening 21 is preferably rectangular, but it can also be slot-shaped. It is only necessary to ensure that the electrical connection cable 3 can pass through smoothly. That is, the length of the side opening 21 is greater than the width of the electrical connection cable 3, and the width of the side opening 21 is greater than the thickness of the electrical connection cable 3.

[0082] In this embodiment, the lens cap ring 23 is bonded to the fixed lens module 15 with adhesive, and clamps the liquid lens module 12 in the middle. Alternatively, the lens cap ring 23 and the fixed lens module 15 are connected by threads.

[0083] In this embodiment, the optical support 5 is cuboid, and the fixed lens module 15 is completely fixed to the optical support 5 with glue. In other embodiments, the fixed lens module 15 and the optical support 5 are connected by threads or sliding means.

[0084] Example 3

[0085] like Figure 9 As shown, compared to the aforementioned embodiments, the liquid lens module 12 in this embodiment consists only of the liquid lens 1 and the electrical connection wire 3, and does not include the lens mount 2. This makes the overall structure more compact and further reduces the overall size of the device.

[0086] In this embodiment, a first conductive connector with a first conductive opening 31 and a second conductive connector with a second conductive opening 32 sandwich the liquid lens 1 in between. The first conductive connector is in contact with the first electrode 101, and the second conductive connector is in contact with the second electrode 102. In another embodiment, the first conductive connector may be in contact with the second electrode 102, and the second conductive connector may be in contact with the first electrode 101, without affecting the overall function of the device. The materials of the first and second conductive connectors can be the same flexible material as the flexible circuit 30, making it easier for the two conductive connectors to fit the liquid lens 1 and easier to install, thus reducing installation costs. The lead-out portion of the electrical connection line 3, i.e., the flexible circuit 30, can be connected to the image sensor circuit module 6 through the support opening 20 provided on the optical support 5.

[0087] Preferably, a washer 40 is provided between the locking ring 4 and the conductive connector, and the washer 40 is annular in shape. In this embodiment, the washer 40 is made of an elastic material. The connection method between the locking ring 4 and the optical support 5 is the same as in Embodiment 1.

[0088] Example 4

[0089] like Figure 10 As shown, the image sensor circuit module 6, the processor circuit module 8, the liquid lens driving circuit module 9, and the interface circuit module 10 are integrated on the image acquisition engine module 50. The image acquisition engine module 50 is provided with an image acquisition engine connector 51, which is used for communication with external circuits and output of image data.

[0090] In this embodiment, the processor circuit module 8 does not acquire or process image data from the image sensor 14, but only communicates with the image sensor 14 and sets some parameters, such as gain and exposure time. Simultaneously, the processor circuit module 8 also controls the liquid lens drive circuit module 9 and the illumination circuit module 7. This module does not perform any processing on the image output by the sensor 14. The image acquisition engine module 50 can communicate with external devices to transmit image information. The image acquisition engine module 50 can be easily integrated into electronic devices with various image processing functions. Taking a PDA (Portable Data Acquisition Terminal) as an example, the PDA's main processor can receive image data from the image acquisition engine module 50 and process it to extract the character information of the barcode (including one-dimensional and two-dimensional codes) in the image. Besides image processing, the PDA's main processor can also indirectly control the liquid lens module 12 and the illumination circuit module 7 through the processor circuit module 8 integrated in the image acquisition engine module 50.

[0091] The preferred embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A photosensitive device, comprising an adjustable optical module, characterized in that, The adjustable optical module includes a fixed lens module and a liquid lens module. The liquid lens module is positioned in front of the fixed lens module, and the fixed lens module has an aperture. The liquid lens module is configured to adjust the focal length. The liquid lens module includes a liquid lens and an electrical connection wire. The liquid lens includes a first electrode and a second electrode. The electrical connection wire includes a first conductive connector and a second conductive connector. The first conductive connector is connected to the first electrode, and the second conductive connector is connected to the second electrode. The electrical connection wire is a flexible printed circuit or a flexible flat cable. The first and second conductive connectors are made of a foldable conductive flexible material. Both the first and second conductive connectors have conductive openings, and the diameter of the conductive openings is not less than the light-transmitting aperture of the liquid lens.

2. The photosensitive device as claimed in claim 1, characterized in that, Of the first conductive connector and the second conductive connector, at least one is annular, and its annular inner diameter is not less than the light-transmitting aperture of the liquid lens.

3. The photosensitive device as claimed in claim 1, characterized in that, At least one of the first conductive connector and the second conductive connector is C-shaped.

4. The photosensitive device as claimed in claim 2, characterized in that, It also includes a support module and an image sensor circuit module; the adjustable optical module, the fixed lens module, the support module and the image sensor circuit module are assembled together axially in sequence.

5. The photosensitive device as claimed in claim 4, characterized in that, It also includes a processor circuit module, a liquid lens driving circuit module, and an interface circuit module; the processor circuit module is used to process and send instructions; the liquid lens driving circuit module is used to adjust the parameters of the adjustable optical module; and the interface circuit module is used to communicate with the outside world and transmit data and instructions.

6. The photosensitive device as claimed in claim 5, characterized in that, The support module includes an optical support base with a support base opening. The support base opening is a circular hole with a diameter not less than the light-transmitting aperture of the liquid lens and not less than the light-transmitting aperture of the fixed lens module.

7. The photosensitive device as claimed in claim 6, characterized in that, Both the adjustable optical module and the fixed lens module are connected to the first end of the optical support, with the fixed lens module located between the adjustable optical module and the optical support. The image sensor circuit module is connected to the second end of the optical support. The adjustable optical module, the fixed lens module, and the optical support are optically connected, allowing light from the object to be observed to pass sequentially through the adjustable optical module, the fixed lens module, and the optical support, thereby being received by the image sensor circuit module.

8. The photosensitive device as claimed in claim 7, characterized in that, It also includes a fastening device, wherein the adjustable optical module and the fixed lens module are both disposed between the fastening device and the optical support, so that the adjustable optical module and the fixed lens module are fixed on the optical support.

9. The photosensitive device as claimed in claim 8, characterized in that, The fastening device is ring-shaped, and its inner diameter is not less than the light-transmitting aperture of the liquid lens, the inner diameter of the fastening device is not less than the light-transmitting aperture of the fixed lens module, and the inner diameter of the fastening device is not greater than the outer diameter of the adjustable optical module.

10. The photosensitive device as claimed in claim 9, characterized in that, An annular washer is provided between the fastening device and the adjustable optical module.

11. The photosensitive device as claimed in claim 10, characterized in that, The fastening device includes a locking ring, the outer surface of which is provided with an external thread, and the inner surface of the support seat opening is provided with an internal thread corresponding to the external thread. The locking ring and the optical support seat are connected by a threaded engagement.

12. The photosensitive device as claimed in claim 11, characterized in that, The locking ring is a non-closed ring, and the inner surface of the support seat opening is provided with an annular groove, and the locking ring is disposed in the annular groove.

13. The photosensitive device as claimed in claim 10, characterized in that, The fastening device is a lens cover ring, which has a central opening. The central opening is circular, and its diameter is not less than the light-transmitting aperture of the liquid lens, the light-transmitting aperture of the fixed lens module, and the outer diameter of the adjustable optical module.

14. The photosensitive device as claimed in claim 13, characterized in that, A side opening is provided on the side of the lens cover ring. The side opening is elongated and its length is greater than the width of the electrical connection wire, and its width is greater than the thickness of the electrical connection wire.

15. The photosensitive device as claimed in claim 14, characterized in that, The system includes an image acquisition engine module, which integrates the image sensor circuit module, the processor circuit module, the liquid lens driving circuit module, and the interface circuit module. The image acquisition engine module also includes an image acquisition engine connector for communication and data transmission with external devices.

16. The photosensitive device as claimed in claim 15, characterized in that, It also includes a lighting circuit module disposed on the support module, the lighting circuit module comprising multiple light-emitting elements.

17. The photosensitive device as claimed in claim 16, characterized in that, The light-emitting element emits light in one or more of the visible, infrared, or ultraviolet bands.

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