CN102645817A - Hemispherical opening and closing lens blocking device based on gear structure - Google Patents

Abstract

The invention discloses a hemispherical opening-closing lens shielding device based on a gear structure. The hemispherical opening-closing lens shielding device comprises a clack set, a gear set and a motor, wherein the clack set comprises at least two clacks, which are pivotally connected on the same rotating axis, each clack is provided with a corresponding closing position and a corresponding opening position, a hemispherical surface is formed and covers a convex lens when each clack is at the corresponding closing position, and the clack is outside the visual angle of the convex lens when each clack is at the corresponding opening position; the gear set is used for driving each clack of the clack set to rotate between the corresponding closing position and the corresponding opening position, so as to enable the clacks to simultaneously reach the corresponding closing positions or the corresponding opening positions; and the motor is used for providing power for the gear set. Since the clacks are driven by the gear set to rotate at different speed in different directions and only one motor is used for realizing the driving and accurate position of the clacks, the hemispherical opening-closing lens shielding device based on the gear structure has the advantages of simple structure, accurate moving position, stable and reliable parts and small manufacturing difficulty.

Description

Hemispherical opening and closing lens blocking device based on gear structure

technical field

The invention relates to an openable and closable hemispherical lens shielding device, in particular to a hemispherical openable and closable lens shielding device based on a gear transmission structure.

Background technique

Image acquisition equipment such as cameras and cameras are basically equipped with a lens shielding device. When the equipment is not shooting images, the shielding device is closed to protect the lens and photosensitive devices. When shooting is required, the shielding device is opened manually or mechanically. The common mechanical blocking device generally adopts the baffle type, which is designed for translational opening and closing movement. This will not affect the imaging when using a lens with a small viewing angle, but when using a lens with a large viewing angle such as ultra-wide-angle and fisheye , because the front end of this type of lens has a protruding lens unit, if the position of the lens remains unchanged, the mechanical structure of the translation block is usually still located within the viewing angle range of the lens after opening, reducing the effective imaging range. Especially for a fisheye lens with an angle of view reaching or even exceeding 180°, the shading device for translational opening and closing of the baffle is usually not suitable, and the method of manually removing the hood that matches the lens is mostly used.

Therefore, it is necessary to provide a lens shielding device suitable for fisheye lenses to meet the shielding protection requirements of super wide-angle or fisheye lenses.

Contents of the invention

The purpose of the present invention is to provide a hemispherical opening and closing lens shielding device based on a gear structure, which drives multiple petals to rotate at different speeds and directions through a gear set, and only one motor can realize the driving and closing of multiple petals. Accurate positioning, simple structure, accurate movement position, stable and reliable components, and low processing difficulty.

In order to achieve the above object, the present invention provides a hemispherical opening and closing lens shielding device based on a gear structure, including:

A flap set comprising at least two flaps pivotally connected on the same axis of rotation; each of the flaps has a corresponding closed position and a corresponding open position, when each of the flaps is in When corresponding to the closed position, a hemispherical spherical surface is formed, and the hemispherical spherical surface covers the protruding lens, and when the corresponding opening position is located, the flap is located outside the viewing angle of the protruding lens;

The gear set is used to drive each flap of the flap set to rotate between the corresponding closed position and the corresponding open position, so that the flaps reach the corresponding closed position and the corresponding open position at the same time;

An electric motor for powering the gear set.

Preferably, in the above device, the pitch circle radius and/or the number of teeth of each gear in the gear set is determined according to the predetermined movement speed of each of the petals and the predetermined relative movement position between the petals.

Preferably, the above-mentioned device also includes:

a bracket for mounting the flap set, the gear set and the motor;

A motion control module is used to receive computer instructions and control the driving state of the motor;

The power module is used to provide electric energy for the motor and the motion control module.

Preferably, in the above-mentioned device, the number of petals of the at least two petals is N, and N is an even number; the gear set includes:

A fixed driven gear shaft, the axis of which coincides with the rotation axis of the petals, and N mutually independent driven gears are installed on the driven gear shaft, which respectively drive the N petals;

A fixed transmission gear shaft, the axis of which is parallel to the rotation axis of the flap; N/2 transmission gears meshed with the driven gear are installed on the transmission gear shaft, and the number of teeth of the transmission gears is different from each other Same, N/2 said transmission gears are fixed together;

A rotatable drive gear shaft, the axis of which is parallel to the rotation axis of the petals, is connected to the motor through a fixed shaft cylinder; A driving gear that is fixed and meshed with the driven gear, and the number of teeth of the driving gears is different from each other; a driving gear that is fixed with the driving gear shaft and meshed with the transmission gear is also installed on the shaft of the driving gear. Independent driving gear.

Preferably, in the above-mentioned device, the petals corresponding to the driven gear meshing with the driving gear constitute a first group, and the petals corresponding to the driven gear meshing with the driving gear constitute a second group, and the The flaps in the first set move in the opposite direction to the flaps in the second set.

Preferably, in the above-mentioned device, one end of each petal is integrally connected with the corresponding driven gear, and the other end of each petal is equipped with a fixed wheel, and the fixed wheel is sleeved on the axis of rotation. on the fixed axis.

Preferably, in the above-mentioned device, both the transverse section and the longitudinal section of the petal are arc-shaped, the longitudinal arc of the petal is 180°, and the transverse arc is not less than 180°/N.

Preferably, in the above-mentioned device, N=4, and the flap material is opaque metal or hard plastic.

Embodiments of the present invention at least have the following technical effects:

1) The embodiment of the present invention drives each petal to rotate between the corresponding closed position and the corresponding open position through the gear, that is, the multiple petals are driven to rotate at different speeds and directions through the gear set. The gear transmission structure is small in size, so the lens The blocking device has simple mechanical structure, accurate movement position, stable and reliable parts, and low processing difficulty.

2) In the embodiment of the present invention, the petals reach the corresponding closed position and the corresponding open position at the same time through the combination of gears, and only one motor can be used to realize the driving and accurate positioning of multiple petals.

3) In the embodiment of the present invention, the petals are divided into two groups with opposite movement directions, and at the same time, the amplitude of the gear ratio is reduced, the requirements for processing technology and installation space are reduced, and it is easy to process and use.

4) The lens shielding device proposed by the present invention can completely shield the lens of the imaging device when closed, and will not affect the imaging field of view without moving the lens after opening.

Description of drawings

Fig. 1 is a schematic structural diagram of a closed state of a hemispherical lens shielding device according to an embodiment of the present invention;

Fig. 2 is a schematic structural diagram of an open state of a hemispherical lens shielding device according to an embodiment of the present invention;

3 is a schematic diagram of the petals of the hemispherical lens shielding device according to the embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a transmission gear set of a hemispherical lens shielding device according to an embodiment of the present invention.

Detailed ways

The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

Fig. 1 and Fig. 2 are respectively the structural diagrams of the closed state and the open state of the hemispherical lens blocking device according to the embodiment of the present invention. As shown in Fig. 1 and Fig. 2, the embodiment of the present invention provides a hemispherical lens blocking device based Combined lens blocking device, including:

The flap set 110 includes at least two flaps, the at least two flaps are pivotally connected on the same rotation axis; each of the flaps has a corresponding closed position and a corresponding open position, and the flaps located in the corresponding closed position At least two petals form a hemispherical shielding spherical surface covering the protruding lens, and the at least two petals located at corresponding open positions are located outside the viewing angle of the protruding lens;

The gear set 120 is used to: drive each of the petals to rotate between the corresponding closed position and the corresponding open position through the gear, so that the at least two petals reach the corresponding closed position and the corresponding open position at the same time;

The motor 130 is used for: providing power for the gear set.

It can be seen that in the embodiment of the present invention, the gear drives each petal to rotate between the corresponding closed position and the corresponding open position, that is, the gear set drives a plurality of petals to rotate at different speeds and directions, and the gear transmission structure is small in size, so the lens The blocking device has simple mechanical structure, accurate movement position, stable and reliable parts, and low processing difficulty. In the embodiment of the present invention, the petals are divided into two groups with opposite moving directions, and the petals reach the corresponding closed position and the corresponding open position at the same time through gears, so that multiple petals can be driven by only one motor and accurate positioning.

In the hemispherical lens blocking device of the embodiment of the present invention, when the lens is not moved, the entire mechanical structure of the device is outside the range of 180° of the viewing angle of the lens without affecting the imaging field of view and range of the lens.

In a preferred embodiment, the pitch circle radius and/or the number of teeth of each gear in the gear set is determined according to the predetermined movement speed of each of the petals and the predetermined relative movement position between the petals.

Among them, the lens blocking device also includes:

The bracket 140 is used for: installing and fixing the flap set 110, the gear set 120 and the motor 130;

The motion control module 210 is configured to: receive computer instructions and control the driving state of the motor;

The power supply module 220 is configured to: provide electric energy for the motor and the motion control module.

Fig. 4 is a schematic structural diagram of a transmission gear set of a hemispherical lens blocking device according to an embodiment of the present invention. In a preferred embodiment, the number of petals of the at least two petals is N, and N is an even number; as shown in Fig. 4, The gear set includes:

A fixed driven gear shaft 410, the axis of which coincides with the rotation axis of the petals, and N mutually independent driven gears are installed on the driven gear shaft, which respectively drive the N petals;

Fixed transmission gear shaft 420, the axis is parallel to the rotation axis of the flap; N/2 transmission gears meshed with the driven gear are installed on the transmission gear shaft, and the number of teeth of the transmission gears is mutually Not the same, N/2 said transmission gears are fixed together;

The rotatable driving gear shaft 430, whose axis is parallel to the rotation axis of the flap, is connected to the motor through a fixed shaft cylinder; The driving gear is fixed and meshed with the driven gear, the number of teeth of the driving gear is different from each other; the driving gear shaft is also installed with a fixed and meshed with the driving gear shaft Independent driving gear.

In a preferred embodiment, the petals corresponding to the driven gear meshing with the driving gear constitute a first group, and the petals corresponding to the driven gear meshing with the driving gear constitute a second group, the first The flaps in one set move in the opposite direction to the flaps in said second set.

Fig. 3 is the petal schematic diagram of hemispherical lens shielding device of the embodiment of the present invention; As shown in Fig. The other end is equipped with a fixed wheel 150, and the fixed wheel 150 is sleeved on a fixed shaft 160 on the rotation axis.

In a preferred embodiment, the section of the petal is arc-shaped, the longitudinal (perpendicular to the direction of movement) arc of the petal is 180°, and the transverse (direction of movement) arc is 180°/N+a°, where The value of a can be adjusted according to requirements.

Therefore, the hemispherical shielding spherical surface formed by the N flaps is an arc surface of greater than or equal to 180° in the circumferential direction (moving direction) perpendicular to the rotation axis.

Both the cross section and the longitudinal section of the petal are arc-shaped, and are made of metal or hard plastic material, which has a certain hardness and is opaque, which can protect the lens. In order to ensure shading, there is a certain overlap between the petals. In a preferred embodiment, the number of petals is 4, and the arc of each petal is 180° perpendicular to the direction of motion and parallel to the direction of motion. Up is 50°. The radians of each flap are consistent, and the arc radii vary by 1mm from small to large. Of course, in actual use, the number and radian of the petals can be adjusted according to the situation, but the number of petals must be an even number;

As shown in Figure 2, when the shielding device is opened, the petals are divided into two groups, which rotate in opposite directions with the fixed shaft as the axis, and when opened in place, the two groups of petals are located on both sides of the fixed shaft axis;

As shown in Figure 4, the transmission gear set includes a driving gear shaft 430, a transmission gear shaft 420, a driven gear shaft 410, and M gears that mesh with each other, M=N×2+1;

The driving gear shaft 430 is fixed with the motor shaft, and the gears on the driving shaft are fixed with the shaft. Therefore, the gears on the shaft are consistent with the rotation direction and speed of the motor; the gears on the shaft are divided into two groups according to the transmission function: One group transmits the rotation of the motor to the transmission gear shaft, and the other group transmits the rotation of the motor to the gear on the driven gear shaft; the number of teeth of each gear is different, and the rotation direction and speed are the same;

The driven gear shaft 410 is fixed on the bracket and cannot rotate; the gears on the shaft are divided into two groups, the positions are adjacent, and one group meshes with the gears on the transmission shaft one-to-one, and the rotation direction of this group of gears is consistent with the rotation direction of the motor; A group of gears meshes one-to-one with the gears on the driving gear shaft, and the rotation direction of this group of gears is opposite to that of the motor; each gear is independent of each other, and is fixed with a flap respectively; the number of teeth of each gear is different, and the rotation speed is different ;

The transmission gear shaft 420 is fixed on the bracket; the gear on the shaft is located between the driving and driven gears in the transmission relationship, and is responsible for transmitting the rotation of the motor to the gear on the driven gear shaft; the shaft gears are fixed to each other, and the rotational power It is obtained by meshing one of the gears with the gear on the drive shaft; all the gears maintain the same rotation speed and direction, and the rotation direction is opposite to that of the motor; each gear has a different number of teeth, and it meshes with the gear on the driven gear shaft one-to-one;

In a preferred embodiment, there are 4 flaps; so the number of gears on the driven gear shaft is also 4; the gear set needs to use 9 gears altogether; One end is fixed together, and there is a certain distance between the gears to ensure that they do not rub against each other; C1 meshes with C2; C4 meshes with C5 and also meshes with C3; C6 meshes with C7; C8 meshes with C9; C1 and C4, C6 and C8 are respectively fixed together;

In the process of opening and closing, the rotation angle of each flap is different, which are ±90°, ±45°, ±45°, ±90° respectively, and the realization depends on the number of teeth between the transmission gears; at the same time, each shaft The gears on it must ensure that the axes are on the same straight line. In order to mesh correctly, the pitch circle radius R of the gears must satisfy a certain relationship:

R _C9 +R _C8 =R _C7 +R _C6 =D3, R _C9 =R _C8 , R _C7 /R _C6 =2;

R _C5 +R _C4 =R _C1 +R _C2 =D1, R _C1 =R _C2 , R _C5 /R _C4 =2;

R _C3 + R _C4 = D2, R _C3 = R _C4 , R _C3 < D2-R _{drive shaft} -R _{drive shaft} ;

The thickness of the gears must also consider that there should be a certain gap between the gears that have no direct transmission relationship with each other to avoid unnecessary friction;

In this embodiment, in order to install the whole device in a small space without increasing the difficulty of processing, the pitch circle radius, number of teeth and thickness of each gear are as follows:

gear C1 C2 C3 C4 C5 C6 C7 C8 C9 Pitch circle radius (mm) 4.5 4.5 3 3 6 5 10 7.5 7.5 Number of teeth 15 15 10 10 20 15 30 20 20 Gear Thickness (mm) 2.5 2 2 2.5 2 2.5 2 2.5 2

The rotating shaft of motor 130 is fixed together with drive gear shaft 430, and the power supply supplies power to the motor and the motion control module; C8 rotates in the same direction and at the same speed as the motor; C3 meshes with C4 and has the same number of teeth, and C4 and C1 are fixed together, so C1 and C4 rotate in opposite directions with C3 at the same speed, that is, they rotate in the opposite direction and at the same speed as the motor; C1 meshes with C2 and has the same number of teeth The same, so C2 and C1 rotate in the opposite direction at the same speed, that is, they rotate in the same direction and at the same speed as the motor; C4 meshes with C5, and the number of teeth is 1/2 of C5, so C5 and C4 are in the opposite direction and in the same direction as the motor, and the speed is 1 of the motor /2; C6 meshes with C7, and the number of teeth is 1/2 of C7, so C7 and C6 are reversed, that is, they rotate in the opposite direction with the motor, and the speed is 1/2 of the motor; C8 meshes with C9 and has the same number of teeth, so C9 and C8 are reversed. When the motor rotates in the opposite direction, the speed is the same; when the motor rotates 90° forward, C2 drives the flap to rotate 90° in the same direction, C5 drives the flap to rotate 45° in the same direction, and C7 drives the flap to rotate 45° in the opposite direction , C9 drives the flap to reversely rotate 90°. According to the rotation speed of the motor, the time required for the motor to rotate 90° can be calculated. As the action timer of the motion control module, when the timer reaches the predetermined time, the motion control module stops the motor action, and an opening process is completed. When the closing command is executed, the motion control module drives the motor to reversely rotate 90°, and all the gears drive the flaps to close in place according to the meshing relationship.

In terms of the function of limiting the rotation angle of the motor, the method of installing a limit switch or using a stepper motor can also be adopted.

It can be seen from the above that the embodiments of the present invention have the following advantages:

1) The embodiment of the present invention drives each petal to rotate between the corresponding closed position and the corresponding open position through the gear, that is, the multiple petals are driven to rotate at different speeds and directions through the gear set. The gear transmission structure is small in size, so the lens The blocking device has simple mechanical structure, accurate movement position, stable and reliable parts, and low processing difficulty.

2) In the embodiment of the present invention, the at least two petals reach the corresponding closed position and the corresponding open position at the same time through gears, and only one motor can realize the driving and accurate positioning of multiple petals.

3) In the embodiment of the present invention, the petals are divided into two groups with opposite movement directions, and at the same time, the amplitude of the gear ratio is reduced, the requirements for processing technology and installation space are reduced, and it is easy to process and use.

4) The lens shielding device proposed by the present invention can completely shield the lens of the imaging device when closed, and will not affect the imaging field of view without moving the lens after opening.

The above is only a preferred embodiment of the present invention, it should be pointed out that, for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications can also be made. It should be regarded as the protection scope of the present invention.

Claims (8)

1. the semisphere folding camera lens radical occlusion device based on gear structure is characterized in that, comprising:

The limb group comprises at least two limbs, and said at least two limbs pivot and are connected on the same rotation; Each said limb has corresponding make-position and corresponding open site;, each said limb constitutes a semisphere sphere when being positioned at corresponding make-position; Said semisphere sphere covers the protrusion camera lens, and said limb is positioned at outside the visual angle of said protrusion camera lens when being positioned at corresponding open site;

Gear set, each limb that is used to drive said limb group rotates between corresponding make-position and corresponding open site, makes said limb arrive corresponding make-position simultaneously and arrives corresponding open site simultaneously;

Motor is used to said gear set power is provided.

2. semisphere folding camera lens radical occlusion device according to claim 1 is characterized in that the pitch radius of each gear and/or the number of teeth are confirmed according to the predetermined movement velocity of each said limb and the predetermined relative movement position between limb in the said gear set.

3. semisphere folding camera lens radical occlusion device according to claim 1 is characterized in that, also comprises:

Carriage is used to install said limb group, said gear set and said motor;

Motion-control module is used for the receiving computer instruction, controls the driving condition of said motor;

Power module is used to said motor and said motion-control module provides electric energy.

4. according to claim 1,2 or 3 described semisphere folding camera lens radical occlusion devices, it is characterized in that the limb quantity of said at least two limbs is N, N is an even number; Said gear set comprises:

Fixing passive tooth wheel shaft, axis overlaps with the said rotation of said limb, and N separate driven gear is installed on the said passive tooth wheel shaft, N said limb of corresponding respectively drive;

Fixing driving gearshaft, axis is parallel with the said rotation of said limb; N/2 transmission gear that is meshed with said driven gear is installed on the said driving gearshaft, and the number of teeth of said transmission gear is different, and N/2 said transmission gear is together fastened to each other;

The driving gear shaft that can rotate, axis is parallel with the said rotation of said limb, and passes through fixedly that beam barrel links to each other with said motor; N/2 driving gear that fixes and be meshed with said driven gear with said driving gear shaft is installed on the said driving gear shaft, and the number of teeth of said driving gear is different; An independent driving gear that fixes and be meshed with said transmission gear with said driving gear shaft also is installed on the said driving gear shaft.

5. semisphere folding camera lens radical occlusion device according to claim 4 is characterized in that,

The pairing limb of driven gear that is meshed with said driving gear constitutes first group, and the pairing limb of driven gear that is meshed with said transmission gear constitutes second group, and the limb direction of motion in the limb in said first group and said second group is opposite.

6. semisphere folding camera lens radical occlusion device according to claim 4 is characterized in that,

One end of each said limb is connected as a single entity with corresponding driven gear, and the other end of each said limb is equipped with fast pulley, and said fast pulley is enclosed within on the stationary shaft that is positioned on the said rotation.

7. semisphere folding camera lens radical occlusion device according to claim 6 is characterized in that,

The lateral cross section and the longitudinal cross-section of said limb are arc, and vertical radian of said limb is 180 °, and laterally radian is not less than 180 °/N.

8. semisphere folding camera lens radical occlusion device according to claim 7 is characterized in that, N=4, and said limb material is lighttight metal or duroplasts.

Images