CN113281948A

CN113281948A - Active focus following device for virtual film production

Info

Publication number: CN113281948A
Application number: CN202110693150.5A
Authority: CN
Inventors: 王伟东; 李炼
Original assignee: Zhejiang Versatile Media Co ltd
Current assignee: Zhejiang Versatile Media Co ltd
Priority date: 2021-06-22
Filing date: 2021-06-22
Publication date: 2021-08-20

Abstract

The invention relates to an active focus follower for virtual film production, in particular to a device for feeding back the focusing direction of a camera. The active focus follower for virtual film making comprises a camera accessory bottom plate, a zoom gear disc meshed with a camera zoom ring and a stepping motor arranged in a motor shell, wherein a worm transmission mechanism and a pipe clamp are respectively arranged above the motor shell, and the stepping motor drives the zoom gear disc to rotate through the worm transmission mechanism; the active focus follower is adjusted and arranged through the pipe clamp and the bottom plate of the camera accessory. The effect of this product is mainly video shooting, in dynamic video shooting, focuses on the focus of camera lens, and convenient, swift, simple than traditional manual focusing and carousel focusing, use more accurate, stable just, accomplish focusing constantly in mainly shooting.

Description

Active focus following device for virtual film production

Technical Field

The invention relates to an active focus follower for virtual film production, in particular to a device for feeding back the focusing direction of a camera.

Background

The common zooming is realized by manually adjusting the camera to rotate the zooming ring by a user, and then, the manual zooming device is used to rotate the zooming ring to realize zooming.

The focus follower is an auxiliary device commonly used by photographic equipment in the photographic industry, and is a device for focusing a camera on a bracket arranged on a bottom plate of a camera accessory; in the process of shooting images, focusing needs to be continuously, repeatedly and frequently carried out according to different scenes of field shooting. In the photography industry, at present, a picture needs to be captured by rotating a zoom ring of a camera during shooting. The focus follower is a convenient and accurate focusing alignment device.

In the prior art, a mechanical transmission mode is usually adopted, but the coke follower is heavy and inconvenient to carry, so that great inconvenience is brought to a user; most of the focus follower is fixed on the rabbit cage, the application occasion is single, and the expansion performance is insufficient; the photographing is unstable when the device is used, the picture is not clear enough, and the photographing effect is affected.

The traditional film and television shooting and animation production flow in the current market usually can spend huge manpower, material resources, financial resources, time and the like in the shooting period and the later period to select a satisfactory lens from massive shooting data, so that huge waste can be caused, a virtual shooting system is developed for the purpose, pain points of traditional shooting are solved, and the shooting efficiency is improved. However, new virtual shooting brings new problems, and the technology aims to solve the problem of coordination of lens focusing between the traditional shooting and the virtual shooting and combines the traditional shooting and the virtual shooting.

Disclosure of Invention

The present invention aims to overcome the above-mentioned drawbacks of the prior art, and thus to develop an active focus follower for virtual production. The active focus follower is used for the first time in virtual shooting, the promotion of the synergistic capability is increased, the financial resources, the manpower, the time and the material resources are effectively reduced, and the brand new active focus follower is used for virtual shooting.

The technical scheme adopted by the invention is as follows:

an active focus follower for virtual film making comprises a camera accessory bottom plate, a zoom gear disc meshed with a camera zoom ring and a stepping motor arranged in a motor shell, wherein a worm transmission mechanism and a pipe clamp are respectively arranged above the motor shell, and the stepping motor drives the zoom gear disc to rotate through the worm transmission mechanism; the active focus follower is adjusted and arranged through the pipe clamp and the bottom plate of the camera accessory. The active focus follower can be used for conveniently and highly accurately controlling the zoom ring of the camera, so that simple and single operation and high-precision focusing are realized, and the device is simple in installation and structure, convenient to carry, install and use, stable in shooting, strong in expansibility, good in transmission ratio and high in synchronism.

Preferably, the pipe clamp comprises a pipe clamp locking hole, a nut and a sliding groove, the pipe clamp locking hole is connected to the inner sliding groove in a sliding mode through the nut, and the sliding groove is fixed on the motor shell; the pipe clamp locking hole is locked with the bottom plate of the camera accessory.

Preferably, the sliding groove and the nut are respectively a T-shaped sliding groove and a T-shaped nut matched with the T-shaped sliding groove.

Preferably, the worm transmission mechanism comprises a worm and a worm wheel which are arranged in the worm transmission shell, the stepping motor drives the worm through the worm wheel, and the worm further drives the zoom gear disc.

Preferably, the worm transmission mechanism further comprises a first bearing, a second bearing, a first rotating fixed turntable and a second rotating fixed turntable, the first bearing and the second bearing are arranged at two ends of the worm respectively, the second rotating fixed turntable is fixed with the zoom gear disc, the first rotating fixed turntable is fixed with the worm transmission shell, and the first rotating fixed turntable and the second rotating fixed turntable are arranged corresponding to the first bearing and the second bearing respectively. The transmission mechanism is simple, convenient to process, low in cost and convenient to operate.

Preferably, the worm drive shell is fixedly connected with the motor shell.

Preferably, the worm drive shell is provided with a first worm drive shell mounting hole, a second stepping motor shell mounting hole and a first stepping motor shell mounting hole, and the motor shell is provided with a second stepping motor shell mounting hole and a first stepping motor shell mounting hole; and a first worm transmission shell mounting hole and a second worm transmission shell mounting hole are formed in the worm transmission shell, the first stepping motor shell mounting hole is fixed with the first worm transmission shell mounting hole, and the second stepping motor shell mounting hole is fixed with the second worm transmission shell mounting hole.

Preferably, the worm fixing device further comprises a rotary fixing turntable mounting hole and a worm fixing hole, and the rotary fixing turntable mounting holes on the rotary fixing turntable I and the rotary fixing turntable II are respectively fixed with the worm fixing hole on the worm.

Preferably, the stepping motor cable is further included, and the stepping motor cable is connected with the stepping motor in a control mode.

Preferably, the first worm transmission shell mounting hole, the second stepping motor shell mounting hole and the first stepping motor shell mounting hole are double-hole positions.

Compared with the prior art, the light portable active coke follower for virtual film making is reasonable in structure, mechanical loss among components can be reduced, and the service life is prolonged; fix through the handle screw on the control tube clamp locking hole, strengthen the suitability, can the antiskid, fix, can also improve effectual connection steadiness.

The active focus follower has a simple structure, can realize active zooming, and can properly adjust the zooming speed of the active focus follower through the running rotation adjustment of the stepping motor, namely the rotating speed of the zooming gear disc. The miniature stepping motor is adopted, the structure is simple, and the material is light, so that the carrying is convenient; the size of the active focus following device can be reduced, the active focus following device can be installed at the fixable position of the bottom plate of the camera accessory according to actual conditions, and the active focus following device is effectively convenient and simple to install. The upper surfaces of the left side and the right side of the zoom ring on the camera can be installed, so that the application occasions are increased.

The product mainly plays a role in video shooting, and focuses of a focus of a lens are focused in dynamic video shooting. Compared with the traditional manual focusing and turntable focusing, the automatic focusing device is convenient, quick and simple, and is more accurate and stable in use. Focusing is mainly completed at any moment during photographing.

As is well known, focusing in the photography industry is completed by a focus person, in the current virtual shooting, one person can be saved by the active focus follower in the virtual industrial shooting, and it can be seen that unstable factors of the person in the virtual shooting are influenced by the shooting, and when the active focus follower is used, focusing stability is brought, so that the virtual shooting is smoother.

Drawings

In order to illustrate more clearly the embodiments of the invention or solutions in the prior art, reference will now be made briefly to the attached drawings used in the description of the embodiments or solutions in the prior art, it being apparent that the drawings in the following description are some embodiments of the invention and that, to a person skilled in the art, other drawings can be derived from them without inventive effort.

Fig. 1 is a schematic diagram of the connection between the active focus follower and the camera.

Fig. 2 is a perspective view of the active focus follower of the present product.

Figure 3 is a perspective view of the tube clamp of the active focus follower of this product.

FIG. 4 is a schematic diagram of the internal transmission of the active type focus follower of this embodiment.

FIG. 5 is a schematic view of the active focus follower connecting parts of the present invention.

Description of reference numerals: 1-active focus follower; 2-camera accessory backplane; 3-camera; 4-zoom ring; 21-step motor; 22-worm drive housing; 23-motor shell; 24-pipe clamp; 31-pipe clamp locking hole; 32-T-shaped nut; 33-T-shaped chute; 41-rotating the fixed turntable one; 42-step motor cable; 43-bearing one; 44-a worm; 45-turbine; 46-bearing two; 47-rotating the fixed turntable II; 48-zoom Gear plate; 51, a first mounting hole of the worm transmission shell; 52-mounting hole II of worm drive shell; 53-mounting hole II of the shell of the stepping motor; 54-mounting hole of stepping motor shell I; 55-mounting hole of rotary fixed turntable; 56-worm fixing hole.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The design concept is as follows: by giving a starting command to the stepping motor 21, the motor transmission is realized to transmit to the worm 44, the worm 44 drives the gear zooming gear disc 48, and finally, the focusing effect is realized.

Example (b):

fig. 1 is a schematic diagram of the connection between the active focus follower and the camera, and includes an active focus follower 1, a camera accessory bottom plate 2 and a camera 3, where the active focus follower 1 is fixed on the camera accessory bottom plate 2, and the active focus follower 1 is engaged with a zoom ring 4 of the camera through a gear; the active focus follower 1 is fixed on the camera accessory bottom plate 2 under the fixing action of the camera accessory bottom plate 2, and can be adjusted constantly through the locking nut, so that the adjustment is convenient and the operation is simple.

Fig. 2 is a perspective view of the active focus follower of the present invention, which is composed of a step motor 21, a worm transmission housing (in which a worm transmission mechanism is arranged) 22, a motor housing 23 and a pipe clamp 24; the stepping motor 21 is mounted in a motor housing 23, and a worm drive housing 22 and a pipe clamp 24 are respectively fixed above the motor housing 23, and mainly form the external structure of the active focus follower 1 as a whole.

Fig. 3 is a perspective view of the tube clamp of the active focus follower of the present invention, which has a tube clamp locking hole 31, a T-shaped nut 32, and a T-shaped chute 33; a T-shaped nut 32 is arranged in the T-shaped chute 33, the pipe clamp 24 is arranged above the T-shaped nut 32, the T-shaped chute 33 is arranged above the motor shell 23, and the pipe clamp 24 and the motor shell 23 are connected through the T-shaped nut 32; the pipe clamp 24 is provided with the pipe clamp locking hole 31, the pipe clamp locking hole 31 is locked with the camera accessory bottom plate 2, the adjustment is convenient, the loosening and tightening are convenient through a handle screw, and the operation is convenient and labor-saving.

Fig. 4 is a schematic diagram of the internal transmission of the active type focus follower of the present invention, and the worm transmission mechanism includes a first rotary fixed turntable 41, a stepping motor cable 42, a first bearing 43, a worm 44, a turbine 45, a second bearing 46, a second rotary fixed turntable 47, and a zoom gear disk 48. Wherein, the stepping motor cable 42 comes out from the stepping motor 21, and the rotating shaft of the stepping motor 21 is contacted with the turbine 45 through a flat key and matched together; the upper part of the worm wheel 45 is matched with the worm 44, and two ends of the worm 44 are respectively provided with a first bearing 43, a second bearing 46, a first rotary fixed turntable 41 and a second rotary fixed turntable 47, wherein the second rotary fixed turntable 47 is fixed with a zoom gear disc 48, and the first rotary fixed turntable 41 is fixed with the worm transmission shell 22; the whole stepping motor 21 inside the device drives the worm wheel 45, the worm wheel 45 drives the worm 44, and the worm 44 drives the zoom gear disc 48 to realize transmission.

FIG. 5 shows the positions of the active focus follower connecting parts of the product, which are schematically shown and connected: the worm driving shell mounting hole I51, the worm driving shell mounting hole II 52, the stepping motor shell mounting hole II 53, the stepping motor shell mounting hole I54, the rotary fixing turntable mounting hole 55 and the worm fixing hole 56. A second mounting hole 53 of the shell of the stepping motor and a first mounting hole 54 of the shell of the stepping motor are arranged on the motor shell 23; the worm drive shell 22 is provided with a first worm drive shell mounting hole 51 and a second worm drive shell mounting hole 52, the rotary fixing turntable mounting hole 55 and the worm fixing hole 56 are fixed through nuts, the first stepping motor shell mounting hole 54 and the first worm drive shell mounting hole 51 are fixed through nuts, and the second stepping motor shell mounting hole 53 is fixedly connected with the second worm drive shell mounting hole 52.

In the aspect of the design of the active coke follower of the product, the adopted synthetic material has light weight and high strength, so that the weight of the active coke follower is 400g, the weight of the coke follower on the current market is more than 1kg, and the light weight is favorable for the load and carrying of the whole equipment, and the movement and the like of the active coke follower are convenient.

The working principle is as follows:

the camera 3 and the active type focus follower 1 as shown in fig. 1 and 4 are mutually engaged through the zoom ring 4 and the zoom gear disc 48 to transmit power from the zoom gear disc 48 to the zoom ring 4 to complete power transmission. The active focus follower 1 is fixed with a camera accessory bottom plate 2. With reference to fig. 3, the pipe clamp locking hole 31 is fixed with the sliding shaft on the base plate 2 of the film machine fitting, and the sliding shaft is fixed on the base plate 2 of the film machine fitting through a handle screw which is often used by people, so that the film machine fitting can be loosened and tightened conveniently, is convenient and labor-saving to operate, and is convenient to fix;

as shown in fig. 4, the initial power source is the stepping motor 21, and the stepping motor 21 controls the speed and the acceleration of the motor rotation by controlling the pulse frequency, so as to achieve the purpose of speed regulation, which is convenient for control and operation. The shaft of the stepping motor 21 is provided with a turbine 45, the stepping motor 21 is connected with the turbine 45 through a flat key, the flat key is just used for the detachable connection between the stepping motor 21 and the turbine 45 to transmit torque and movement, and the turbine 45 rotates along with the stepping motor 21. The worm 44 is arranged above the worm wheel 45, the worm 44 and the worm wheel 45 are used for transmitting the motion and power between two staggered gears, the transmission of the worm 44 is equivalent to spiral transmission and is multi-tooth meshing transmission, so the transmission is stable, the noise is low, the self-locking performance is realized, and the material adopts expensive materials with better friction reduction and wear resistance and good lubricating devices, so the defects of low transmission efficiency and more serious wear are overcome. The worm 44 is provided with a first bearing 43, a second bearing 46, a first rotary fixed turntable 41 and a second rotary fixed turntable 47. The first bearing 43 and the second bearing 46 can just support the worm 44 to rotate on two sides of the worm 44, so that the friction coefficient in the movement process is reduced, and the rotation precision is ensured. The first rotating fixed turntable 41 and the second rotating fixed turntable 47 are mainly used for fixing, and the first rotating fixed turntable 41 is fixed with the worm transmission shell 22; the second rotary fixed turntable 47 is fixed with the zoom gear disc 48, and finally the transmission of the worm 44 drives the zoom gear disc 48 to rotate, so that the zoom gear disc 48 is transmitted to the zoom ring 4, and the focusing effect is realized;

as shown in fig. 5, all the parts are fixed through mounting holes to form an active focus follower, a first worm drive housing mounting hole 51 is connected with a first stepping motor housing mounting hole 54 through a threaded connector, a second worm drive housing mounting hole 52 is connected with a second stepping motor housing mounting hole 53 through a threaded connector, and a rotary fixing turntable mounting hole 55 and a worm fixing hole 56 are fixed together through threads to achieve balanced and balanced force transmission.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. An active focus follower for virtual film production, comprising a camera accessory bottom plate and a zoom gear wheel engaged with a camera zoom ring, characterized in that: the device also comprises a stepping motor arranged in the motor shell, a worm transmission mechanism and a pipe clamp are respectively arranged above the motor shell, and the stepping motor drives the zoom gear disc to rotate through the worm transmission mechanism; the active focus follower is adjusted and arranged through the pipe clamp and the bottom plate of the camera accessory.

2. The active focus follower for virtual production of film of claim 1, wherein: the pipe clamp comprises a pipe clamp locking hole, a nut and a sliding chute, the pipe clamp locking hole is connected to the inner sliding chute in a sliding mode through the nut, and the sliding chute is fixed on the motor shell; the pipe clamp locking hole is locked with the bottom plate of the camera accessory.

3. The active focus follower for virtual production of film of claim 2, wherein: the sliding groove and the nut are respectively a T-shaped sliding groove and a T-shaped nut matched with the T-shaped sliding groove.

4. The active focus follower for virtual production of film of claim 1, wherein: the worm drive mechanism comprises a worm and a worm wheel which are arranged in a worm drive shell, the stepping motor drives the worm through the worm wheel, and the worm further drives the zoom gear disc.

5. The active focus follower for virtual production of claim 4, wherein: the worm transmission mechanism further comprises a first bearing, a second bearing, a first rotary fixed turntable and a second rotary fixed turntable, the two ends of the worm are respectively provided with the first bearing and the second bearing, the second rotary fixed turntable is fixed with the zoom gear disc, the first rotary fixed turntable is fixed with the worm transmission shell, and the first rotary fixed turntable and the second rotary fixed turntable are respectively arranged corresponding to the first bearing and the second bearing.

6. The active focus follower for virtual production of claim 5, wherein: the worm transmission shell is fixedly connected with the motor shell.

7. The active focus follower for virtual production of claim 6, wherein: the worm transmission shell is provided with a first worm transmission shell mounting hole, a second stepping motor shell mounting hole and a first stepping motor shell mounting hole, and the motor shell is provided with a second stepping motor shell mounting hole and a first stepping motor shell mounting hole; and a first worm transmission shell mounting hole and a second worm transmission shell mounting hole are formed in the worm transmission shell, the first stepping motor shell mounting hole is fixed with the first worm transmission shell mounting hole, and the second stepping motor shell mounting hole is fixed with the second worm transmission shell mounting hole.

8. The active focus follower for virtual production of claim 7, wherein: the worm fixing device is characterized by further comprising a rotary fixing turntable mounting hole and a worm fixing hole, wherein the rotary fixing turntable mounting holes in the first rotary fixing turntable and the second rotary fixing turntable are respectively fixed with the worm fixing hole in the worm.

9. The active focus follower for virtual production of film of claim 1, wherein: the stepping motor cable is connected with the stepping motor in a control mode.

10. The active focus follower for virtual production of claim 7, wherein: the first worm transmission shell mounting hole, the second stepping motor shell mounting hole and the first stepping motor shell mounting hole are double hole positions.