CN115480432A - Be applicable to and share optical axis diaphragm bore automatic regulating mechanism - Google Patents

Abstract

An automatic adjustment mechanism suitable for common optical axis diaphragm aperture, belonging to the field of photoelectric spherical table infrared cameras, including: diaphragm gland, bearing inner pressure ring, cross rolling bearing, bearing outer pressure ring, motor adapter seat, main support Flange, DC servo motor, imaging lens group, driving gear, driven gear, lever iris, two photoelectric switch blocks, lever holder, two photoelectric switches, aperture lever and two Blank mount. In the present invention, the size of the center hole of the driven gear is matched with the size of the outer diameter of the lever-type iris diaphragm, so as to satisfy the maximum degree of no mechanical coordination error when the center hole of the driven gear and the lever-type iris are installed. ; High-precision cross-rolling bearings can withstand axial and radial forces, ensuring that the aperture of the lever-type iris diaphragm is always coaxial with the main optical axis of the imaging lens group during the change process, and will not introduce mechanical errors . In the present invention, a mechanical hard limit is designed, which can protect the lever-type iris from being damaged.

Description

An Automatic Adjustment Mechanism Suitable for Common Optical Axis Diaphragm Aperture

technical field

The invention belongs to the technical field of photoelectric ball table infrared cameras, and in particular relates to an automatic adjustment mechanism suitable for a common optical axis diaphragm aperture.

Background technique

In recent years, photoelectric ball table infrared cameras have been developed rapidly, especially widely used in forestry and border defense and other fields. In natural environments such as forests and frontier defenses, the sun’s illuminance is different in the morning, middle, and evening every day, which leads to changes in the radiant energy of objects. The infrared camera needs to change the amount of light entering the lens according to the strength of the ambient radiant energy, otherwise the detector will be damaged. The energy received by the focal plane is too strong, causing the gray value of the detector to be oversaturated. Therefore, a motorized iris diaphragm needs to be added to the lens, and the aperture of the diaphragm needs to be coaxial with the optical axis of the optical system. Waiting for information feedback, changing the aperture size of the aperture, and then controlling the amount of light entering the lens, so as to obtain a clear picture quality.

At present, most of the motorized iris diaphragms on the market are modular products, which are only suitable for the laboratory environment. The mechanical interface is connected to the lens optical system, and it is difficult to ensure that the center hole of the diaphragm is coaxial with the optical axis of the optical system. There will be vignetting phenomenon in the image during use. Even if the requirement of coaxiality between the central hole of the diaphragm and the optical axis of the optical system is ensured through complex adjustment means, it will consume a lot of manpower and material resources, and in the long-term use in the future, With the influence of the ambient temperature, the central hole of the diaphragm gradually shifts, which cannot meet the requirements of the optical system.

Contents of the invention

In order to overcome the above-mentioned many disadvantages existing in the existing electric iris, the present invention provides an automatic adjustment mechanism for the aperture of the common optical axis iris.

The technical scheme that the present invention adopts for solving technical problems is as follows:

An automatic adjustment mechanism for the common optical axis diaphragm aperture of the present invention, comprising: a main support flange;

A DC servo motor and an imaging mirror group installed on the rear surface of the main support flange;

The driving gear, driven gear and lever holder installed on the front surface of the main support flange; the driving gear is set on the main shaft of the DC servo motor, and the driving gear, driven gear and lever holder are arranged in sequence from top to bottom ; The drive gear meshes with the driven gear;

A lever-type iris diaphragm installed in the center hole of the driven gear;

The aperture cover installed on the edge of the center hole of the driven gear; the inner wall of the aperture cover presses the lever type variable aperture;

The first photoelectric switch stopper and the second photoelectric switch stopper symmetrically installed on the surface edge of the driven gear; the first photoelectric switch stopper and the second photoelectric switch stopper are symmetrically arranged on both sides of the diaphragm cover;

The cross rolling bearing set on the rear end of the driven gear;

The bearing inner pressure ring set on the outer ring of the cross rolling bearing; the inner ring of the bearing inner pressure ring is matched with the outer ring of the cross rolling bearing;

The bearing outer pressure ring connected to the rear end of the driven gear; the inner side wall of the bearing outer pressure ring matches the rear side wall of the cross rolling bearing;

The first photoelectric switch and the second photoelectric switch are symmetrically installed on both sides of the lever holder; the first photoelectric switch and the second photoelectric switch are respectively connected to the DC servo motor;

The diaphragm driving rod installed on the upper end of the driving rod holding seat; the diaphragm driving rod is inserted into the groove on the outer wall of the driving rod type iris diaphragm.

Further, the first photoelectric switch block and the second photoelectric switch block are processed with long slot holes; when the first photoelectric switch block and the second photoelectric switch block rotate counterclockwise with the driven gear, the first photoelectric switch The switch shutter is inserted into the first photoelectric switch, and the extreme value size of the aperture change of the lever type variable aperture is adjusted by slightly adjusting the position of the first photoelectric switch shutter to block the first photoelectric switch. The signal generated by the first photoelectric switch is fed back to the DC servo motor, and the DC servo motor stops working to realize the electronic limit of the change of the aperture of the lever-type variable aperture to the limit position; when the first photoelectric switch block and the second photoelectric switch block When the plate rotates clockwise with the driven gear, the second photoelectric switch shutter is inserted into the second photoelectric switch, and the aperture of the lever-type iris is adjusted by slightly adjusting the position where the second photoelectric switch shutter blocks the second photoelectric switch For the extreme size of the change, the second photoelectric switch is blocked by the second photoelectric switch to generate a signal feedback to the DC servo motor, and the DC servo motor stops working, realizing the electronic limit of the change of the lever-type iris aperture to the limit position .

Furthermore, when the first photoelectric switch is accidentally damaged, the electronic limit cannot be completed and the DC servo motor cannot stop working, the mechanical hard limit formed between the side of the diaphragm cover and the left side of the upper end of the lever holder Block the rotation of the driven gear and protect the lever-type iris from damage; when the second photoelectric switch is accidentally damaged, the electronic limit cannot be completed and the DC servo motor cannot stop working, and the side of the diaphragm cover and the dial The mechanical hard limit formed between the right side of the upper end of the rod holder prevents the driven gear from rotating and protects the lever-type iris from being damaged.

Further, the aperture cover is an arc-shaped structure, and the opening at the lower end of the aperture cover is aligned with the aperture lever.

Further, it also includes a motor adapter seat installed on the rear surface of the main support flange, and the DC servo motor is installed on the motor adapter seat.

Further, a DC servo motor encoder is installed on the DC servo motor.

Further, it also includes a first baffle mounting seat and a second baffle mounting seat symmetrically installed on the surface edge of the driven gear, and the first baffle mounting seat and the second baffle mounting seat are symmetrically arranged on the aperture cover Left and right sides; the first photoelectric switch blocking piece and the second photoelectric switch blocking piece are installed on the outer ends of the first blocking piece mounting seat and the second blocking piece mounting seat respectively.

Further, the structural dimensions of the first photoelectric switch blank and the second photoelectric switch blank are the same.

The beneficial effects of the present invention are:

An automatic adjustment mechanism for the aperture of the common optical axis diaphragm of the present invention is used as the main support structure of the lens, and each lens in the imaging lens group is then installed in cooperation with it to ensure the coaxiality accuracy of the entire optical axis to the greatest extent from a mechanical point of view; The lever-type iris has the characteristics of high caliber change accuracy and low cost. The size of the center hole of the driven gear is matched with the outer diameter of the lever-type iris to meet the maximum requirements for the center hole of the driven gear and There is no mechanical fit error when the lever-type iris is installed, and the driven gear has the characteristics of anti-vibration and impact; the cross-rolling bearing is a high-precision cross-rolling bearing, which can withstand axial and radial forces, ensuring The runout accuracy of the shaft system is 0.005mm, which can ensure that the aperture of the lever-type iris diaphragm is always coaxial with the main optical axis of the imaging lens group during the change process, so that no mechanical error will be introduced when the shaft system rotates. In the present invention, a mechanical hard limit is designed, which can protect the lever-type iris from being damaged.

Description of drawings

FIG. 1 is a schematic structural diagram of an automatic adjustment mechanism for common optical axis diaphragm apertures according to the present invention.

FIG. 2 is a structural schematic diagram of an automatic adjustment mechanism for common optical axis diaphragm apertures according to the present invention.

Fig. 3 is a front view of an automatic adjustment mechanism for the common optical axis diaphragm aperture of the present invention.

Fig. 4 is a sectional view along the line A-A shown in Fig. 3 .

Figure 5 is a schematic diagram of the position of the mechanical hard limit.

In the figure, 1. Aperture gland, 2. Bearing inner pressure ring, 3. Cross-rolling bearing, 4. Bearing outer pressure ring, 5. Motor adapter seat, 6. Main support flange, 7. DC servo motor , 8, imaging lens group, 9, driving gear, 10, driven gear, 11, lever type iris diaphragm, 12, first photoelectric switch block, 13, lever holder, 14, first photoelectric switch , 15, aperture lever, 16, the first shutter mount, 17, the second photoelectric switch shutter, 18, the second shutter mount, 19, the second photoelectric switch, C, mechanical hard limit position.

detailed description

The present invention will be described in further detail below in conjunction with the accompanying drawings.

As shown in Figures 1 to 4, an automatic adjustment mechanism for the common optical axis diaphragm aperture of the present invention mainly includes: diaphragm gland 1, bearing inner pressure ring 2, cross rolling bearing 3, bearing external pressure Ring 4, Motor Adapter 5, Main Support Flange 6, DC Servo Motor 7, Imaging Mirror Group 8, Driving Gear 9, Driven Gear 10, Lever Type Iris Diaphragm 11, First Photoelectric Switch Block 12 , lever holder 13, first photoelectric switch 14, aperture lever 15, first shutter mount 16, second photoelectric switch shutter 17, second shutter mount 18, second photoelectric switch 19 and DC Servo motor encoder.

Imaging mirror group 8 is installed on the center of the rear surface of main support flange 6; the motor adapter seat 5 is installed on the upper end of the rear surface of main support flange 6, and the DC servo motor 7 is installed on the motor adapter seat 5, and the DC servo motor 7 passes through the motor The adapter seat 5 is connected to the main support flange 6; the DC servo motor encoder is installed on the DC servo motor 7; On the main shaft, the driving gear 9 is driven to rotate by the main shaft of the DC servo motor 7; the driven gear 10 is installed in the center of the front surface of the main support flange 6, and the driving gear 9 and the driven gear 10 mesh with each other; the lever-type iris diaphragm 11 is installed In the center hole of the driven gear 10, the central axis of the lever-type iris diaphragm 11 coincides with the main optical axis of the imaging lens group 8; Installed on the edge of the center hole of the driven gear 10, and at the same time, the opening of the aperture cover 1 is set directly below, that is, the opening of the aperture cover 1 is aligned with the aperture lever 15, and the lever-type variable light is passed through the inner wall of the aperture cover 1. The ring 11 is compressed; the first blocking plate mounting seat 16 and the second blocking plate mounting seat 18 are symmetrically installed on the surface edge of the driven gear 10, and the first blocking plate mounting seat 16 and the second blocking plate mounting seat 18 are symmetrically arranged on the The left and right sides of the diaphragm gland 1; the first photoelectric switch blocking plate 12 is installed on the first blocking plate mounting seat 16 outer end, the second photoelectric switch blocking plate 17 is installed on the second blocking plate mounting seat 18 outer end, and The first photoelectric switch catch 12 and the second photoelectric switch catch 17 are arranged symmetrically; The switch block 17 is all processed with long slot holes; the lever holder 13 is installed on the lower end of the front surface of the main support flange 6, and the lever holder 13 is located directly below the driven gear 10; the aperture lever 15 is installed on the lever On the upper end of the holder 13, the diaphragm lever 15 is inserted into the groove on the outer wall of the lever-type iris 11; the first photoelectric switch 14 and the second photoelectric switch 19 are symmetrically installed on the left and right sides of the lever holder 13, and the first The photoelectric switch 14 and the second photoelectric switch 19 are respectively connected with the DC servo motor 7; as shown in Figure 4, the inner ring of the cross rolling bearing 3 is set on the rear end of the driven gear 10, and the bearing inner pressure ring 2 is set on the cross rolling bearing 3 Outer ring, bearing inner pressure ring 2 Inner ring matches with cross rolling bearing 3 outer ring, bearing outer pressure ring 4 is connected with driven gear 10 rear end, bearing outer pressure ring 4 inner side wall and cross rolling bearing 3 rear Compatible with side walls.

An automatic adjustment mechanism for the aperture of the common optical axis of the present invention is used as the main support structure of the lens, and the lenses in the imaging lens group 8 are then installed in cooperation with it, so as to ensure the coaxiality accuracy of the entire optical axis to the greatest extent from a mechanical point of view. .

In this embodiment, the lever-type iris 11 in shelf products is adopted. As a mature product, it has the characteristics of high caliber change accuracy and low cost. The size of the center hole of the driven gear 10 adopts the The 11 outer diameter size matching method satisfies to the greatest extent that there is no mechanical coordination error when the center hole of the driven gear 10 and the lever-type iris 11 are installed, and the driven gear 10 has the characteristics of anti-vibration and impact.

In this embodiment, the aperture lever 15 is clamped by the lever holder 13 and kept stationary. When the lever-type variable diaphragm 11 rotates with the driven gear 10, the aperture lever 15 and the lever-type variable diaphragm 11 rotate together. The two iris diaphragms 11 realize relative movement, thereby realizing the electric control change of the caliber of the lever type iris diaphragm 11 .

In this embodiment, the driving part is mainly composed of a gear pair and a DC servo motor 7. The main shaft of the DC servo motor 7 drives the driving gear 9 to rotate forward or reversely. The main optical axis of the imaging lens group 8 rotates.

In this embodiment, the main body of the lever-type variable diaphragm 11 is installed in the shaft system of the driven gear 10, and the two are precisely machined by means of shaft-hole cooperation. The cross-rolling bearing 3 is a high-precision cross-rolling bearing, which can Withstand axial and radial force, ensure that the rotation and runout accuracy of the shaft system is 0.005mm, which is far less than the optical accuracy error index, so it can ensure that the aperture of the lever-type iris diaphragm 11 is always in line with the main light of the imaging lens group 8 during the change process The shaft maintains the coaxiality requirement, so that no mechanical error will be introduced when the shaft system rotates.

In this embodiment, the DC servo motor encoder is installed on the DC servo motor 7, and the DC servo motor encoder is a 4096-bit incremental encoder, which can increase the resolution of the caliber change size of the lever-type iris diaphragm 11 to meet the requirements of the dial. Rod-type iris 11 micro-caliber change requirements.

In this embodiment, the drive gear 9 is fixedly connected to the main shaft of the DC servo motor 7 , and the rotation of the main shaft of the DC servo motor 7 drives the driven gear 10 to rotate, thereby realizing the controllable change in the diameter of the lever-type iris 11 .

As shown in Figure 5, the first photoelectric switch catch 12 and the second photoelectric switch catch 17 are all processed with slotted holes, when the first photoelectric switch catch 12 and the second photoelectric switch catch 17 follow the driven gear 10 When turning counterclockwise, the first photoelectric switch stopper 12 is inserted into the first photoelectric switch 14, and the position where the first photoelectric switch stopper 12 blocks the first photoelectric switch 14 can be slightly adjusted, and then the lever-type iris diaphragm can be precisely adjusted The extreme size of the 11 caliber changes, the first photoelectric switch 14 is blocked by the first photoelectric switch block 12 to generate a signal feedback to the DC servo motor 7, and the DC servo motor 7 stops working, thereby realizing the 11 caliber of the lever-type iris diaphragm Change to the electronic limit position of limit position; Similarly, when the first photoelectric switch catch 12 and the second photoelectric switch catch 17 rotate clockwise with the driven gear 10, the second photoelectric switch catch 17 is inserted into the second photoelectric switch In the switch 19, the second photoelectric switch stopper 17 can be slightly adjusted to block the position of the second photoelectric switch 19, and then the extreme value size of the aperture change of the lever type iris 11 can be precisely adjusted, and the second photoelectric switch stopper 17 can block the position of the second photoelectric switch 19. The second photoelectric switch 19 generates a signal to feed back to the DC servo motor 7, and the DC servo motor 7 stops working, so as to realize the electronic limit of the aperture change of the lever-type iris 11 to the limit position. In addition, when the first photoelectric switch 14 is accidentally damaged, and the electronic limit cannot be completed and the DC servo motor 7 cannot stop working, it can be formed between the side surface of the diaphragm cover 1 and the left side of the upper end of the lever holding seat 13. Mechanical hard limit stops the driven gear 10 from rotating, thereby protecting the lever-type iris 11 from damage; similarly, when the second photoelectric switch 19 is accidentally damaged, the electronic limit cannot be completed and the DC servo motor 7 When the work cannot be stopped, the driven gear 10 can be prevented from rotating through the mechanical hard stop formed between the side of the aperture cover 1 and the right side of the upper end of the lever holder 13, thereby protecting the lever-type iris 11 from will be damaged.

In describing the present invention, it is to be understood that the terms "central", "longitudinal", "transverse", "front", "rear", "left", "right", "vertical", "horizontal", The orientations or positional relationships indicated by "top", "bottom", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying It means that the device or element referred to must have a specific orientation, be constructed and operated for a specific orientation, and thus cannot be construed as limiting the protection content of the present invention.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still be Modifications are made to the technical solutions described in the foregoing embodiments, or equivalent replacements are made to some of the technical features, but these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims (8)

1. An automatic aperture adjusting mechanism suitable for a common-optical-axis diaphragm comprises: main support flange, its characterized in that still includes:

the direct current servo motor and the imaging lens group are arranged on the rear surface of the main supporting flange;

the driving gear, the driven gear and the deflector rod retaining seat are arranged on the front surface of the main supporting flange; the driving gear is sleeved on a main shaft of the direct current servo motor, and the driving gear, the driven gear and the deflector rod holder are sequentially arranged from top to bottom; the driving gear is meshed with the driven gear;

the shifting rod type iris diaphragm is arranged in a central hole of the driven gear;

a diaphragm gland mounted at the edge of the central hole of the driven gear; the inner wall of the diaphragm gland presses the shifting rod type iris diaphragm;

the first photoelectric switch blocking piece and the second photoelectric switch blocking piece are symmetrically arranged on the edge of the surface of the driven gear; the first photoelectric switch blocking piece and the second photoelectric switch blocking piece are symmetrically arranged on two sides of the diaphragm gland;

the crossed rolling bearing is sleeved at the rear end of the driven gear;

the bearing inner pressing ring is sleeved on the outer ring of the cross rolling bearing; the inner ring of the bearing is matched with the outer ring of the cross rolling bearing;

the bearing outer pressing ring is connected with the rear end of the driven gear; the inner side wall of the bearing outer pressure ring is matched with the rear side wall of the crossed rolling bearing;

the first photoelectric switch and the second photoelectric switch are symmetrically arranged on two sides of the deflector rod holding seat; the first photoelectric switch and the second photoelectric switch are respectively connected with a direct current servo motor;

a diaphragm deflector rod arranged at the upper end of the deflector rod holder; and the diaphragm deflector rod is inserted into the groove on the outer side wall of the deflector rod type iris diaphragm.

2. The mechanism of claim 1, wherein the first opto-electronic switch blade and the second opto-electronic switch blade are both provided with a slotted hole; when the first photoelectric switch separation blade and the second photoelectric switch separation blade rotate anticlockwise along with the driven gear, the first photoelectric switch separation blade is inserted into the first photoelectric switch, the extreme size of the change of the caliber of the dial-type iris diaphragm is adjusted by slightly adjusting the position of the first photoelectric switch separation blade for shielding the first photoelectric switch, the first photoelectric switch is shielded by the first photoelectric switch separation blade to generate a signal which is fed back to the direct-current servo motor, the direct-current servo motor stops working, and the electronic limit of the change of the caliber of the dial-type iris diaphragm to the extreme position is realized; when the first photoelectric switch separation blade and the second photoelectric switch separation blade rotate clockwise along with the driven gear, the second photoelectric switch separation blade is inserted into the second photoelectric switch, the extreme value size of the change of the caliber of the shifting rod type iris diaphragm is adjusted by slightly adjusting the position of the second photoelectric switch separation blade for shielding the second photoelectric switch, the second photoelectric switch is shielded by the second photoelectric switch separation blade to generate a signal and feed the signal back to the direct current servo motor, the direct current servo motor stops working, and the electronic limit of the change of the caliber of the shifting rod type iris diaphragm to the extreme position is realized.

3. The mechanism as claimed in claim 2, wherein when the first photoelectric switch is accidentally damaged and the dc servo motor fails to stop due to failure of electronic limit, the mechanical hard limit formed between the side surface of the diaphragm cover and the left side surface of the upper end of the shift lever holder stops the rotation of the driven gear to protect the shift lever type iris diaphragm from being damaged; when the second photoelectric switch is accidentally damaged and cannot complete electronic limit, and the direct-current servo motor cannot stop working, the driven gear is blocked from rotating through the mechanical hard limit formed between the side surface of the diaphragm gland and the right side surface of the upper end of the shifting rod retaining seat, and the shifting rod type variable diaphragm is protected from being damaged.

4. The mechanism of claim 1, wherein the aperture cover has an arc shape, and the lower opening of the aperture cover is aligned with the aperture deflector.

5. The mechanism of claim 1, further comprising a motor adapter mounted on a rear surface of the main support flange, wherein the dc servo motor is mounted on the motor adapter.

6. The mechanism of claim 1, wherein the dc servo motor is provided with a dc servo motor encoder.

7. The mechanism of claim 1, further comprising a first and a second stop plate mounting seats symmetrically mounted on the edge of the driven gear surface, wherein the first and second stop plate mounting seats are symmetrically disposed on the left and right sides of the stop cover; the first photoelectric switch separation blade and the second photoelectric switch separation blade are respectively installed at the outer side end parts of the first separation blade installation seat and the second separation blade installation seat.

8. The mechanism of claim 1, wherein the first and second opto-electronic switch shutters have the same size.

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