Mobile phone back clip capable of synchronously arranging external flash lamp

Abstract

The utility model relates to a mobile phone back clip capable of synchronously arranging an external flash lamp in the field of mobile phone accessories, which comprises a mobile phone connecting frame, the mobile phone connecting frame is used for being clamped on the back of an intelligent mobile phone, and further, a hot shoe interface, a wireless signal transmitter, a programmable delayer, a shutter button and a main control circuit board are arranged in the mobile phone connecting frame. The hot shoe interface, the wireless signal emitter, the shutter button and the programmable delayer are all electrically connected with the main control circuit board, accurate synchronization is achieved through the programmable delayer, the built-in programmable delayer can automatically adjust the time offset of a flash trigger signal, the shutter delay difference of different mobile phone models is accurately compensated, and the real-time performance of the mobile phone is improved. The flash time of the external flash lamp is ensured to be completely synchronous with the actual exposure window of the mobile phone, and the problem of light supplement failure or light dislocation is avoided.

Description

Technical Field

[0001] This utility model relates to the field of mobile phone accessories, and in particular to a mobile phone back clip that can synchronize with an external flash. Background Technology

[0002] As smartphone photography capabilities become increasingly powerful, users are demanding higher image quality, leading to a growing need for professional-grade lighting. External flash units can significantly improve image quality in low-light environments, resolving issues such as insufficient power and harsh lighting from built-in smartphone flashes. Especially in still life and portrait photography, professional flash units offer irreplaceable advantages in light control and color temperature stability.

[0003] Currently, the triggering of external flash units on mobile phones mainly relies on two technical paths: 1. Bluetooth wireless connection: pairing with the flash unit via a mobile app and triggering the flash using Bluetooth signals; 2. Audio interface or power interface triggering: triggering the flash unit by simulating electrical signals through the phone's 3.5mm audio interface, Type-C, or Lightning interface.

[0004] The existing two methods for connecting external flashes to mobile phones have the following drawbacks: 1. Insufficient synchronization accuracy: Smartphone cameras have an inherent shutter lag, which is the time difference between receiving the shooting command and the actual exposure. This lag varies dynamically due to factors such as phone model and system load. Traditional triggering methods, such as Bluetooth or audio interfaces, cannot compensate for this in real time, resulting in a misalignment between the flash timing and the exposure window, leading to premature or late flashes and affecting the lighting effect; 2. Poor versatility and compatibility: Existing solutions often require binding to specific apps or phone models and cannot be directly compatible with professional camera hot shoe flashes on the market, limiting the reusability and expandability of the device. Utility Model Content

[0005] In order to overcome the shortcomings of existing technical solutions, this utility model provides a mobile phone back clip that can synchronize an external flash, which can effectively solve the technical problems.

[0006] The technical solution adopted by this utility model to solve its technical problem is:

[0007] A mobile phone back clip that can synchronize with an external flash includes a phone mounting bracket for clamping onto the back of a smartphone. The bracket houses a hot shoe, a wireless transmitter, a programmable delay unit, a shutter button, and a main control circuit board. The hot shoe, wireless transmitter, shutter button, and programmable delay unit are all electrically connected to the main control circuit board. The shutter button and hot shoe extend to the surface of the phone mounting bracket. The hot shoe connects to an external flash, the wireless transmitter connects to the smartphone via Bluetooth, and the programmable delay compensates for signal delay between the smartphone's camera and the external flash. The shutter button controls the operation of the wireless transmitter, programmable delay unit, and hot shoe via the main control circuit board.

[0008] Furthermore, the programmable delay is provided with an interactive panel that extends to the surface of the mobile phone connector.

[0009] Furthermore, the main control circuit board is also electrically connected to a lithium battery and a USB interface, with the USB interface extending to the surface of the mobile phone connector.

[0010] Furthermore, the mobile phone connector includes a fixed base and a movable clamping plate. The fixed base is provided with a sliding groove, and the movable clamping plate is provided with a hot shoe guide rail extending into the sliding groove. The hot shoe guide rail can move along the sliding groove, and a return spring is provided between the hot shoe guide rail and the inner wall of the sliding groove.

[0011] Furthermore, the fixed base is provided with an electronic control cavity, in which the wireless signal transmitter, programmable delay unit and main control circuit board are all installed. The shutter button is located on the surface of the fixed base, and the hot shoe interface is located on the surface of the movable clamp.

[0012] Furthermore, the fixed base includes a front shell, a rear shell, and a rubber shell. The electronic control cavity is located in the front shell, and the rear shell can cover the electronic control cavity. A baffle is provided on the side wall of the front shell, and a silicone pad is provided on the side of the baffle near the electronic control cavity. The rubber shell is installed at the end of the baffle away from the electronic control cavity, and the shutter button is located on the surface of the rubber shell.

[0013] Furthermore, the surface of the movable clamp is provided with a hot shoe groove, the hot shoe interface is located in the hot shoe groove, the hot shoe guide rail is installed at the end of the movable clamp away from the hot shoe groove, and a silicone pad is also provided at the end of the movable clamp away from the hot shoe groove.

[0014] Compared with the prior art, the beneficial effects of this utility model are: 1. Precise synchronization is achieved through a programmable delay device. The built-in programmable delay device can automatically adjust the time offset of the flash trigger signal, accurately compensate for the shutter delay differences of different mobile phone models, and ensure that the flashing time of the external flash is completely synchronized with the actual exposure window of the mobile phone, avoiding the problems of fill light failure or light misalignment.

[0015] 2. With an integrated standard hot shoe interface, it can be directly connected to professional camera flashes without relying on specific apps or phone models. Users can reuse existing photography equipment, such as on-camera flashes and studio fill lights, significantly expanding the device's versatility and functionality. Attached Figure Description

[0016] Figure 1 This is a three-dimensional schematic diagram of the present invention;

[0017] Figure 2 This is an exploded view of the structure of this utility model;

[0018] Figure 3 This is the front view of the present invention;

[0019] Figure 4 This is a schematic diagram showing the connection between the fixed base and the movable clamping plate in this utility model;

[0020] The diagram is labeled as follows: 1-Mobile phone connector, 101-Fixed base, 1011-Front shell, 1012-Rear shell, 1013-Plastic shell, 1014-Baffle, 102-Modible clamp, 2-Hot shoe interface, 3-Programmable delay, 4-Shutter button, 5-USB interface, 6-Display screen, 7-Physical button, 8-Hot shoe guide rail, 9-Slide groove, 10-Reset spring, 11-Hot shoe groove, 12-Silicone pad. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] The following is combined Figures 1-4 This invention provides a detailed description of a mobile phone back clip that can synchronize an external flash:

[0023] A mobile phone back clip that can synchronize with an external flash includes a mobile phone mounting bracket 1, which is used to clip onto the back of a smartphone. Further, the mobile phone mounting bracket 1 houses a hot shoe interface 2, a wireless signal transmitter, a programmable delay unit 3, a shutter button 4, and a main control circuit board. The hot shoe interface 2, wireless signal transmitter, shutter button 4, and programmable delay unit 3 are all electrically connected to the main control circuit board. The shutter button 4 and hot shoe interface 2 both extend to the surface of the mobile phone mounting bracket 1. The hot shoe interface 2 is used to connect to an external flash. The wireless signal transmitter can wirelessly connect to the mobile phone via Bluetooth or WiFi. The programmable delay unit 3 compensates for the signal delay between the camera in the smartphone and the external flash. The shutter button 4 controls the operation of the wireless signal transmitter, programmable delay unit 3, and hot shoe interface 2 via the main control circuit board. The main control circuit board is also electrically connected to a lithium battery and a USB interface 5, which extends to the surface of the mobile phone mounting bracket 1. The built-in lithium battery frees the device from dependence on the phone's battery power, extending continuous use time and making it suitable for long-term outdoor shooting. USB port 5 supports universal charging protocols, has strong compatibility, and can also be used to connect to smartphones via wired connection.

[0024] Precise synchronization is achieved through the programmable delay 3. The built-in programmable delay 3 can automatically adjust the time offset of the flash trigger signal, accurately compensate for the shutter delay differences of different mobile phone models, and ensure that the flash time of the external flash is completely synchronized with the actual exposure window of the mobile phone, avoiding problems such as fill light failure or light misalignment.

[0025] With the integrated standard hot shoe interface 2, professional camera flashes can be directly connected without relying on specific apps or phone models. Users can reuse existing photography equipment, such as on-camera flashes and studio fill lights, significantly expanding the device's versatility and functionality.

[0026] The programmable delay device is equipped with an interactive panel that extends to the surface of the mobile phone connector. The interactive panel includes a display screen 6 and physical buttons 7. Through the external display screen 6 and physical buttons 7, users can directly observe and adjust the flash trigger delay value without relying on a mobile phone APP, which improves the ease of operation. It is especially suitable for fast shooting scenarios. The manual adjustment function can adapt to the shutter delay differences of different brands of mobile phones and avoid synchronization errors caused by automatic calibration failure.

[0027] The mobile phone connector 1 includes a fixed base 101 and a movable clamping plate 102. The fixed base 101 is provided with a slide groove 9, and the movable clamping plate 102 is provided with a hot shoe guide rail 8 extending into the slide groove 9. The hot shoe guide rail 8 can move along the slide groove 9. A return spring 10 is provided between the hot shoe guide rail 8 and the inner wall of the slide groove 9. The movable clamping plate 102 can achieve elastic extension and retraction through the slide groove 9 and the return spring 10, which is compatible with different mobile phone thicknesses.

[0028] The fixed base 101 is equipped with an electronic control cavity, in which the wireless signal transmitter, programmable delay 3, and main control circuit board are all installed. The shutter button 4 is located on the surface of the fixed base 101, and the hot shoe interface 2 is located on the surface of the movable clamp 102. The shutter button 4 is located on the surface of the fixed base 101, making it easier for the thumb to touch the shutter button 4. The hot shoe interface 2 is located on the top of the movable clamp 102, which conforms to the habit of one-handed operation, avoids accidental touch, and optimizes human-computer interaction.

[0029] The fixed base 101 includes a front shell 1011, a rear shell 1012, and a plastic shell 1013. The electronic control cavity is located in the front shell 1011, and the rear shell 1012 can cover the electronic control cavity. A baffle 1014 is provided on the side wall of the front shell 1011, and a silicone pad 12 is provided on the side of the baffle 1014 near the electronic control cavity. The plastic shell 1013 is installed at the end of the baffle 1014 away from the electronic control cavity, and the shutter button 4 is located on the surface of the plastic shell 1013. A hot shoe groove 11 is provided on the surface of the movable clamp 102, and the hot shoe interface 2 is located in the hot shoe groove 11. The hot shoe guide rail 8 is installed at the end of the movable clamp 102 away from the hot shoe groove 11, and a silicone pad 12 is also provided at the end of the movable clamp 102 away from the hot shoe groove 11. The silicone pad 12 cushions the contact between the mobile phone and the hard shell.

[0030] There are two operating methods:

[0031] Wireless connection: When the smartphone performs a photo-taking operation, the shutter button 4 of the phone connector 1 is pressed. The wireless signal transmitter in the phone connector 1 sends a photo-taking trigger command signal to the phone. After the wireless signal receiving module receives the photo-taking signal from the phone, it transmits it to the main control circuit board. The main control circuit board controls the programmable delay 3 to generate a precise time delay according to the user-preset, real-time set delay value or automatically set delay value. After the delay ends, the main control circuit board triggers the external flash through the hot shoe interface 2.

[0032] Wired connection: The device is connected to a smartphone via USB interface 5. When the smartphone takes a picture, the shutter button 4 of the phone connector 1 is pressed, and a photo trigger command signal is sent to the phone via the data cable. After the main control circuit board receives the photo signal transmitted back from the phone via the data cable, the main control circuit board controls the programmable delay unit 3 to generate a precise time delay based on the user-preset, real-time set delay value or automatically set delay value. After the delay ends, the main control circuit board triggers the external flash via the hot shoe interface 2.

[0033] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A mobile phone back clip with a synchronizable external flash, comprising a mobile phone connecting frame for clamping on the back of a smart phone, characterized in that: The phone mounting bracket includes a hot shoe, a wireless signal transmitter, a programmable delay unit, a shutter button, and a main control circuit board. The hot shoe, wireless signal transmitter, shutter button, and programmable delay unit are all electrically connected to the main control circuit board. The shutter button and hot shoe extend to the surface of the phone mounting bracket. The hot shoe is used to connect an external flash, the wireless signal transmitter is used to connect to the smartphone's Bluetooth, and the programmable delay unit compensates for the signal delay between the camera in the smartphone and the external flash. The shutter button controls the operation of the wireless signal transmitter, programmable delay unit, and hot shoe through the main control circuit board.

2. The cell phone back holder with a synchronizable external flash light as claimed in claim 1, wherein: The programmable delay is equipped with an interactive panel that extends to the surface of the mobile phone connector.

3. The cell phone back holder with a synchronizable external flash light as claimed in claim 1 wherein: The main control circuit board is also electrically connected to a lithium battery and a USB interface, with the USB interface extending to the surface of the mobile phone connector.

4. The cell phone back holder with a synchronizable external flash light of any one of claims 1-3, wherein: The mobile phone connector includes a fixed base and a movable clamp. The fixed base has a sliding groove, and the movable clamp has a hot shoe guide rail extending into the sliding groove. The hot shoe guide rail can move along the sliding groove, and a return spring is provided between the hot shoe guide rail and the inner wall of the sliding groove.

5. The cell phone back holder with a synchronizable external flash light as claimed in claim 4, wherein: The fixed base is equipped with an electronic control cavity, in which the wireless signal transmitter, programmable delay unit and main control circuit board are installed. The shutter button is located on the surface of the fixed base, and the hot shoe interface is located on the surface of the movable clamp.

6. The cell phone back holder with a synchronizable external flash light as claimed in claim 5, wherein: The fixed base includes a front shell, a rear shell, and a rubber shell. The electronic control cavity is located in the front shell, and the rear shell can cover the electronic control cavity. A baffle is provided on the side wall of the front shell, and a silicone pad is provided on the side of the baffle near the electronic control cavity. The rubber shell is installed at the end of the baffle away from the electronic control cavity, and the shutter button is located on the surface of the rubber shell.

7. The cell phone back holder with a synchronizable external flash light as claimed in claim 5 wherein: The surface of the movable clamp is provided with a hot shoe groove, the hot shoe interface is located in the hot shoe groove, the hot shoe guide rail is installed at the end of the movable clamp away from the hot shoe groove, and a silicone pad is also provided at the end of the movable clamp away from the hot shoe groove.

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