An active follow focus device for virtual production

Abstract

The present invention relates to an active follow focus device for virtual production, which is a device for focusing direction feedback of a camera. The active follow focus device for virtual production includes a camera accessory base plate and a zoom gear plate meshing with a camera zoom ring, and also includes a stepper motor installed in a motor housing. A worm gear transmission mechanism and a pipe clamp are respectively provided above the motor housing. The stepper motor drives the zoom gear plate to rotate through the worm gear transmission mechanism; the active follow focus device is adjusted and set through the pipe clamp and the camera accessory base plate. The main function of this product is video shooting. In dynamic video shooting, focusing the focus of the lens is more convenient, quicker and simpler than traditional manual focusing and turntable focusing. It is more accurate and stable to use, and is mainly used to complete focusing at all times during photography.

Description

Technical Field

[0001] The invention relates to an active follow focus device for virtual film production, which is a device for a camera to perform focusing direction feedback. Background Art

[0002] Ordinary zoom is achieved by the user manually adjusting the camera by turning the zoom ring. Later, a manual zoom shaker and zoom ring were used to achieve zoom.

[0003] The follow focus is a commonly used auxiliary device for photographic equipment in the photography industry. The follow focus is a device installed on a bracket on the bottom plate of the camera accessory to adjust the focus of the camera. During the process of shooting images, it is necessary to adjust the focus continuously, multiple times, and frequently according to different scenes of the on-site photography. This kind of dynamic photography and real-time focusing, currently in the photography industry, requires the camera's zoom ring to capture the picture when shooting. The follow focus used is a convenient and precise focus adjustment device.

[0004] In the existing follow focus technology, mechanical transmission is usually adopted, but the follow focus is bulky and inconvenient to carry, which brings great inconvenience to users; most of the follow focus are fixed on the rabbit cage, with a single application occasion and insufficient expansion performance; which will lead to unstable photography during use, unclear picture, and affect the photography effect.

[0005] At present, the traditional film and television shooting and animation production process in the market usually spends huge manpower, material resources, financial resources, time, etc. during the shooting period and post-production to select more satisfactory shots from a large amount of shooting data, which actually causes a huge waste. For this reason, a virtual shooting system is developed to solve the pain points of traditional shooting and improve shooting efficiency. But at the same time, new virtual shooting will also bring new problems. This technology aims to solve the problem of lens focusing coordination between traditional and virtual shooting, combining virtual and real. Summary of the invention

[0006] The purpose of the present invention is to overcome the above-mentioned defects in the prior art, and thus an active follow focus device for virtual production is developed. The active follow focus device is used for the first time in virtual shooting, which increases the promotion of collaborative capabilities, effectively reduces financial, human, time and material resources, and brings a new use of active follow focus devices to virtual shooting.

[0007] The technical solution adopted by the present invention is as follows:

[0008] An active follow focus device for virtual filming includes a camera accessory base plate and a zoom gear plate meshing with a camera zoom ring, and also includes a stepper motor installed in a motor housing, a worm gear transmission mechanism and a pipe clamp are respectively provided on the upper part of the motor housing, and the stepper motor drives the zoom gear plate to rotate through the worm gear transmission mechanism; the active follow focus device is adjusted and set through the pipe clamp and the camera accessory base plate. The active follow focus device can conveniently and accurately control the zoom ring of the camera, realize simple operation and high-precision focusing, and has simple installation and structure, is easy to carry, install and use, has stable photography, strong expansibility, good transmission ratio and high synchronization.

[0009] Preferably, the tube clamp comprises a tube clamp locking hole, a nut and a slide groove; the tube clamp locking hole is slidably connected to the inner slide groove through a nut, and the slide groove is fixed on the motor housing; the tube clamp locking hole is locked with the camera accessory base plate.

[0010] Preferably, the slide groove and nut are respectively a T-shaped slide groove and a T-shaped nut matching therewith.

[0011] Preferably, the worm gear transmission mechanism comprises a worm and a turbine which are arranged in a worm gear transmission housing, the stepping motor drives the worm through the turbine, and the worm further drives the zoom gear plate.

[0012] Preferably, the worm gear transmission mechanism further comprises bearing 1, bearing 2, rotating fixed turntable 1 and rotating fixed turntable 2, bearing 1 and bearing 2 are respectively arranged at both ends of the worm, rotating fixed turntable 2 is fixed to the zoom gear plate, rotating fixed turntable 1 is fixed to the worm gear transmission housing, and rotating fixed turntable 1 and rotating fixed turntable 2 are respectively arranged corresponding to bearing 1 and bearing 2. The transmission mechanism is simple, easy to process, low in cost and easy to operate.

[0013] Preferably, the worm gear housing is fixedly connected to the motor housing.

[0014] Preferably, the worm transmission housing is provided with worm transmission housing mounting hole one, worm transmission housing mounting hole two, stepper motor housing mounting hole two and stepper motor housing mounting hole one, and the motor housing is provided with stepper motor housing mounting hole two and stepper motor housing mounting hole one; the worm transmission housing is provided with worm transmission housing mounting hole one and worm transmission housing mounting hole two, the stepper motor housing mounting hole one and worm transmission housing mounting hole one are fixed, and the stepper motor housing mounting hole two is fixed to the worm transmission housing mounting hole two.

[0015] Preferably, it also includes a rotating fixed turntable mounting hole and a worm fixing hole, and the rotating fixed turntable mounting holes on the rotating fixed turntable one and the rotating fixed turntable two are respectively fixed to the worm fixing holes on the worm.

[0016] Preferably, a stepper motor cable is also included, and the stepper motor cable controls and connects the stepper motor.

[0017] Preferably, the worm gear housing mounting hole 1, the worm gear housing mounting hole 2, the stepper motor housing mounting hole 2 and the stepper motor housing mounting hole 1 are all double hole positions.

[0018] Compared with the prior art, the purpose of this product is to provide a lightweight and portable active follow focus device for virtual production, which has a reasonable structure, can reduce mechanical loss between components and increase service life; it can be fixed by adjusting the handle screws on the locking hole of the tube clamp, which enhances applicability, is anti-slip, and can be fixed, and can also improve the stability of effective connection.

[0019] The structure is simple and can realize active zoom. The zoom speed of the active follow focus device, that is, the rotation speed of the zoom gear plate, can be appropriately adjusted by the stepper motor running and rotating. It adopts a micro-stepping motor, has a simple internal structure, and is light in material, which is convenient to carry. It can also reduce the size of the active follow focus device, and can be installed in a fixed position on the bottom plate of the camera accessories according to actual conditions. The active follow focus device is convenient and simple to install. It can be installed on the left or right side of the zoom ring on the camera, increasing its applicable occasions.

[0020] The main function of this product is to shoot videos. In dynamic video shooting, it can adjust the focus of the lens. It is more convenient, quicker, and simpler than traditional manual focusing and dial focusing. It is more accurate and stable to use. It is mainly used to complete the focus at all times during photography.

[0021] As we all know, focusing in the photography industry is done by focus operators. In today's virtual shooting, active follow focus devices in virtual industrial shooting can save a lot of manpower. It can be seen that the unstable factors of personnel in virtual shooting are affected by photography. If active follow focus devices are used, it will bring stability to the focus and make virtual shooting smoother. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific implementation methods of the present invention or the solutions in the prior art, the drawings used in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 This is a schematic diagram of the connection between the active follow focus device of this product and the camera.

[0024] Figure 2This is a stereoscopic image of the active follow focus of this product.

[0025] Figure 3 This is a three-dimensional diagram of the tube clamp of the active follow focus device of this product.

[0026] Figure 4 This is a schematic diagram of the internal transmission of the active follow focus device of this product.

[0027] Figure 5 This is a schematic diagram of the active follow focus connection parts of this product.

[0028] Explanation of the reference numbers: 1——Active follow focus device; 2——Camera accessory base plate; 3——Camera; 4——Zoom ring; 21——Stepper motor; 22——Worm gear housing; 23——Motor housing; 24——Tube clamp; 31——Tube clamp locking hole; 32——T-nut; 33——T-slot; 41——Rotating fixed turntable one; 42——Stepper motor cable; 43——Bearing one; 44——Worm; 45——Turbine; 46——Bearing two; 47——Rotating fixed turntable two; 48——Zoom gear plate; 51——Worm gear housing mounting hole one; 52——Worm gear housing mounting hole two; 53——Stepper motor housing mounting hole two; 54——Stepper motor housing mounting hole one; 55——Rotating fixed turntable mounting hole; 56——Worm fixing hole. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] Design concept: By giving a start command to the stepping motor 21, the motor drives the worm 44, and the worm 44 drives the gear zoom gear plate 48, and finally the focusing effect is achieved.

[0031] Example:

[0032] Figure 1 This is a schematic diagram of the connection between the active follow focus device of this product and the camera, including the active follow focus device 1, the camera accessory base plate 2 and the camera 3, wherein the active follow focus device 1 is fixed on the camera accessory base plate 2, and the active follow focus device 1 and the zoom ring 4 of the camera are meshed together through gears; through the fixing effect of the camera accessory base plate 2, the active follow focus device 1 is fixed on the camera accessory base plate 2, and can also be adjusted at any time through the locking nut, so that the adjustment is convenient and the operation is simple.

[0033] Figure 2 This is a three-dimensional diagram of the active follow focus device of this product, which is composed of a stepper motor 21, a worm gear transmission housing (with a worm gear transmission mechanism inside) 22, a motor housing 23 and a tube clamp 24; the stepper motor 21 is installed in the motor housing 23, and the worm gear transmission housing 22 and the tube clamp 24 are fixed above the motor housing 23 respectively, and these main components constitute the external structure of the active follow focus device 1.

[0034] Figure 3 This is a three-dimensional diagram of the tube clamp of the active follow focus device of this product, and the structure includes a tube clamp locking hole 31, a T-nut 32, and a T-slot 33; the T-slot 33 includes a T-nut 32, and the tube clamp 24 is located above the T-nut 32. The T-slot 33 is located above the motor housing 23, and the T-nut 32 connects the tube clamp 24 and the motor housing 23; there is a tube clamp locking hole 31 on the tube clamp 24, and the tube clamp locking hole 31 is locked together with the camera accessory base plate 2, which is easy to adjust and can be easily loosened and tightened through the handle screw, making the operation convenient and labor-saving.

[0035] Figure 4 This is a schematic diagram of the internal transmission of the active focus follower of this product. The worm gear transmission mechanism includes a rotating fixed turntable 1 41, a stepping motor cable 42, a bearing 1 43, a worm 44, a turbine 45, a bearing 2 46, a rotating fixed turntable 2 47 and a zoom gear plate 48. Among them, the stepping motor cable 42 comes out from the stepping motor 21, and the rotating shaft of the stepping motor 21 is in contact with the turbine 45 through a flat key and matched together; the upper part of the turbine 45 is matched with the worm 44, and the two ends of the worm 44 are respectively provided with a bearing 1 43, a bearing 2 46, a rotating fixed turntable 1 41, and a rotating fixed turntable 2 47, wherein the rotating fixed turntable 2 47 is fixed together with the zoom gear plate 48, and the rotating fixed turntable 1 41 is fixed together with the worm gear transmission housing 22; the entire stepping motor 21 inside drives the turbine 45, the turbine 45 drives the worm 44, and the worm 44 drives the zoom gear plate 48 to transmit, thereby realizing the transmission inside.

[0036] Figure 5The schematic diagram of the connection parts of the active follow focus device of this product shows the connection positions: worm gear housing mounting hole 1 51, worm gear housing mounting hole 2 52, stepper motor housing mounting hole 2 53, stepper motor housing mounting hole 1 54, rotating fixed turntable mounting hole 55, worm fixing hole 56. The motor housing 23 has stepper motor housing mounting hole 2 53 and stepper motor housing mounting hole 1 54; the worm gear housing 22 has worm gear housing mounting hole 1 51 and worm gear housing mounting hole 2 52, the rotating fixed turntable mounting hole 55 and the worm fixing hole 56 are fixed by nuts, the stepper motor housing mounting hole 1 54 and the worm gear housing mounting hole 1 51 are fixed by nuts, and the stepper motor housing mounting hole 2 53 is fixedly connected with the worm gear housing mounting hole 2 52.

[0037] The active follow focus device of the product of this embodiment is designed with synthetic materials, which are light in weight and high in strength, so that the weight of the active follow focus device is 400g. The weight of the follow focus device on the market is more than 1kg. The light weight is beneficial to the load, carrying and movement of the entire equipment of the active follow focus device.

[0038] Working principle:

[0039] like Figure 1 and 4 The camera 3 and the active focus follower 1 are shown to be meshed with each other through the zoom ring 4 and the zoom gear plate 48, so that the power is transmitted from the zoom gear plate 48 to the zoom ring 4. The active focus follower 1 is fixed to the camera accessory base plate 2. Figure 3 , the tube clamp locking hole 31 and the slide shaft on the bottom plate 2 of the camera accessory are fixed together, and the slide shaft on the bottom plate 2 of the camera accessory is fixed by the handle screws we often use. At this time, it can be easily loosened and tightened, which is convenient and labor-saving to operate, and easy to fix;

[0040] like Figure 4The initial power source shown is the stepper motor 21. The stepper motor 21 controls the speed and acceleration of the motor rotation by controlling the pulse frequency, thereby achieving the purpose of speed regulation, which is convenient for control and operation. A turbine 45 is installed on the shaft of the stepper motor 21. The stepper motor 21 is connected to the turbine 45 through a flat key. The flat key is used for the detachable connection between the stepper motor 21 and the turbine 45 to transmit torque and motion. The turbine 45 rotates with the stepper motor 21. Above the turbine 45 is a worm 44. The worm 44 and the turbine 45 mechanism are used to transmit the motion and power between the two interlaced. The transmission of the worm 44 is equivalent to a spiral transmission, which is a multi-tooth meshing transmission, so the transmission is stable, the noise is very small, and it has self-locking properties. The material uses expensive materials with good friction reduction and wear resistance and a good lubrication device, so it makes up for the defects of low transmission efficiency and severe wear. There are bearings 1 43, 2 46, a rotating fixed turntable 1 41, and a rotating fixed turntable 2 47 on the worm 44. The two bearings 1 43 and 2 46 on the two sides of the worm 44 can just support the rotation of the worm 44, reduce the friction coefficient during the movement, and ensure the rotation accuracy. The main function of the rotating fixed turntable 1 41 and the rotating fixed turntable 2 47 is fixing. The rotating fixed turntable 1 41 is fixed to the worm transmission housing 22; the rotating fixed turntable 2 47 is fixed to the zoom gear plate 48. Finally, the transmission of the worm 44 drives the rotation of the zoom gear plate 48, and the zoom gear plate 48 is transmitted to the zoom ring 4 to achieve the focusing function;

[0041] like Figure 5 As shown, all parts are fixed by mounting holes to form an active follow focus device. The worm gear housing mounting hole 1 51 and the stepper motor housing mounting hole 1 54 are connected by threaded connectors. The worm gear housing mounting hole 2 52 and the stepper motor housing mounting hole 2 53 are also connected by threaded connectors. The rotating fixed turntable mounting hole 55 and the worm fixing hole 56 are fixed together by threads to achieve balanced force transmission.

[0042] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An active follow focus device for virtual filming, comprising a camera accessory base plate and a zoom gear plate meshing with a camera zoom ring, characterized in that: It also includes a stepper motor installed in the motor housing, a worm gear transmission mechanism and a tube clamp are respectively provided on the upper part of the motor housing, and the stepper motor drives the zoom gear plate to rotate through the worm gear transmission mechanism; the active follow focus device is adjusted and set through the tube clamp and the bottom plate of the camera accessory; The worm gear transmission mechanism comprises a worm and a turbine arranged in a worm gear transmission housing, the stepping motor drives the worm through the turbine, and the worm further drives the zoom gear plate; The worm transmission mechanism further includes bearing 1, bearing 2, rotating fixed turntable 1 and rotating fixed turntable 2, bearing 1 and bearing 2 are respectively provided at both ends of the worm, rotating fixed turntable 2 is fixed to the zoom gear plate, rotating fixed turntable 1 is fixed to the worm transmission housing, and rotating fixed turntable 1 and rotating fixed turntable 2 are respectively arranged corresponding to bearing 1 and bearing 2; Also included is a stepper motor cable, which controls the connection of the stepper motor.

2. The active follow focus device for virtual film production according to claim 1, characterized in that: The pipe clamp comprises a pipe clamp locking hole, a nut and a slide groove. The pipe clamp locking hole is slidably connected to the inner slide groove through the nut, and the slide groove is fixed on the motor housing; the pipe clamp locking hole is locked with the camera accessory base plate.

3. The active follow focus device for virtual film production according to claim 2, characterized in that: The slide groove and nut are respectively a T-shaped slide groove and a T-shaped nut matched therewith.

4. The active follow focus device for virtual film production according to claim 3, characterized in that: The worm gear transmission housing is fixedly connected to the motor housing.

5. The active follow focus device for virtual film production according to claim 4, characterized in that: The worm transmission housing is provided with worm transmission housing mounting hole 1, worm transmission housing mounting hole 2, stepper motor housing mounting hole 2 and stepper motor housing mounting hole 1, and the motor housing is provided with stepper motor housing mounting hole 2 and stepper motor housing mounting hole 1; the worm transmission housing is provided with worm transmission housing mounting hole 1 and worm transmission housing mounting hole 2, the stepper motor housing mounting hole 1 and worm transmission housing mounting hole 1 are fixed, and the stepper motor housing mounting hole 2 is fixed to the worm transmission housing mounting hole 2.

6. The active follow focus device for virtual film production according to claim 5, characterized in that: It also includes a rotating fixed turntable mounting hole and a worm fixing hole. The rotating fixed turntable mounting holes on the rotating fixed turntable one and the rotating fixed turntable two are respectively fixed to the worm fixing holes on the worm.

7. The active follow focus device for virtual film production according to claim 5, characterized in that: The worm gear housing mounting hole 1, the worm gear housing mounting hole 2, the stepper motor housing mounting hole 2 and the stepper motor housing mounting hole 1 are all double hole positions.

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