CN118625474A - A continuous zoom lens - Google Patents

Abstract

The invention discloses a continuous zoom lens, and relates to the technical field of optical lenses. The technical scheme is that the continuous zoom lens comprises a lens barrel, wherein a base is fixed at one end of the lens barrel, a sliding sleeve coaxial with the lens barrel is sleeved on the outer circular surface of the lens barrel, first rolling bearings are arranged on the inner walls of the two ends of the sliding sleeve, the axes of the first rolling bearings are parallel to the axes of the sliding sleeve, and the outer circular surface of the first rolling bearings is abutted with the outer circular surface of the lens barrel; the end faces at two ends of the sliding sleeve are provided with second rolling bearings, the axes of the second rolling bearings are perpendicular to the axes of the sliding sleeve, and the outer ring faces of the second rolling bearings on the end faces, close to the base, of the sliding sleeve are abutted to the base. The invention has the beneficial effects that rolling friction is formed between the inner wall of the sliding sleeve and the outer circular surface of the lens barrel, between the end surface of the sliding sleeve and the base and the retainer ring, the friction loss is smaller, the high processing precision is not needed, the manufacturing cost is low, the damage is not easy to occur, and the reliability and the durability are higher.

Description

A continuous zoom lens

Technical Field

The invention relates to the technical field of optical lenses, and in particular to a continuous zoom lens.

Background Art

With the rapid development of photography and video technology, the importance of continuous zoom lenses in photographic equipment has become increasingly prominent. Traditional zoom lenses are limited by their fixed focal length switching points and cannot achieve continuous and smooth zoom effects, which greatly restricts the photographer's creative freedom. The emergence of continuous zoom lenses has completely changed this situation. It not only provides continuous and stepless focal length adjustment, but also can achieve precise zoom control within a wide range of focal lengths, thereby meeting the needs of photographers in different shooting scenes, providing photographers with more creative possibilities and enabling them to capture more unique and creative images. Therefore, the application prospects of continuous zoom lenses in the fields of photography and video are broad, and will become one of the important directions for the development of future photography technology.

The existing continuous zoom lens is composed of a lens body and a focusing barrel. As shown in the patent with announcement number CN211293422U and announcement date 2020.08.18, a retaining frame is arranged between the left end face of the focusing barrel and the lens body. A plurality of grooves are arranged on the retaining frame. Balls are arranged in the grooves. The balls change the sliding friction between the lens body and the focusing barrel into rolling friction.

However, in the process of rotating the focusing tube, the ball can only change the sliding friction between the outer wall of the lens body and the inner wall of the focusing tube into rolling friction, and there is still sliding friction between the ball itself and the lens body and the focusing tube. After long-term use, the ball will still be damaged, resulting in rotation jamming, making the focusing tube unable to rotate smoothly, thereby affecting the normal use of the zoom function.

Summary of the invention

The present invention aims at solving the problem that sliding friction still exists when using a ball bearing and a zoom lens will still get stuck after long-term use, and provides a continuous zoom lens which can realize the zoom lens without using a ball bearing, without sliding friction and without getting stuck after long-term use.

To solve the above problems, the technical solution adopted by the present invention is a continuous zoom lens, comprising a lens barrel, a base is fixed at one end of the lens barrel, a sleeve coaxial with the lens barrel is sleeved on the outer cylindrical surface of the lens barrel, a first rolling bearing is installed on the inner wall at both ends of the sleeve, the axis of the first rolling bearing is parallel to the axis of the sleeve, and the outer ring surface of the first rolling bearing abuts against the outer cylindrical surface of the lens barrel; a second rolling bearing is installed on the end surface at both ends of the sleeve, the axis of the second rolling bearing is perpendicular to the axis of the sleeve, and the outer ring surface of the second rolling bearing on the end surface of the sleeve close to the base abuts against the base. During the zooming process, by rotating the sleeve, the first rolling bearing rolls on the outer cylindrical surface of the lens barrel, while the second rolling bearing rolls on the base. This means that rolling friction is formed between the inner wall of the sleeve and the outer cylindrical surface of the lens barrel, and between the end surface of the sleeve and the base. Since rolling friction has a smaller contact area, it has lower requirements on the processing accuracy of the lens barrel and the sleeve compared with sliding friction, thereby effectively reducing the manufacturing cost. In addition, the characteristics of rolling friction make the friction surface less prone to damage, significantly extending the service life.

Preferably, at least six first rolling bearings and second rolling bearings are provided, and the first rolling bearings and second rolling bearings are evenly distributed around the axis of the sliding sleeve. The even distribution of the first rolling bearings and the second rolling bearings helps to evenly disperse the force points on the lens barrel and the base, thereby enhancing the stability and durability of the structure.

Preferably, a retaining ring is fixed to the other end of the lens barrel, and the outer ring surface of the second rolling bearing on the end surface of the sliding sleeve away from the base abuts against the retaining ring. The retaining ring is used to effectively constrain the sliding sleeve to prevent the sliding sleeve from being misaligned during the rotation process, thereby ensuring that the sliding sleeve can stably and accurately perform the zoom operation.

Preferably, a front frame and a rear frame are provided inside the lens barrel, and both the front frame and the rear frame can slide along the axis of the lens barrel, and lenses are fixed on both the front frame and the rear frame. By accurately adjusting the positions of the front frame and the rear frame, a smooth and accurate zoom operation can be achieved.

Preferably, a linear slide groove is provided on the lens barrel, and the length direction of the linear slide groove is the same as the axis direction of the lens barrel, and a cam curve groove is provided on the sliding sleeve, and a guide pin is provided inside the cam curve groove, and the guide pin passes through the linear slide groove and is fixedly connected to the front mirror frame and the rear mirror frame respectively. When the sliding sleeve is rotated, the guide pin is guided by the cam curve groove and starts to slide smoothly along the length direction of the linear slide groove. Since the guide pin is fixedly connected to the front mirror frame and the rear mirror frame respectively, as the guide pin slides, the front mirror frame and the rear mirror frame will also slide accordingly inside the lens barrel, and the front mirror frame and the rear mirror frame can be controlled by controlling the guide pin.

Preferably, at least two linear slide grooves are provided, and the linear slide grooves are evenly distributed around the axis of the lens barrel. At least two linear slide grooves can effectively enhance the control accuracy of the front lens frame and the rear lens frame, ensuring that they can achieve more stable and accurate sliding during the zooming process.

Preferably, a motor is fixed on the base, a driving gear is fixed on the output shaft of the motor, a driven gear is fixed on the end of the sliding sleeve close to the base, and the driven gear and the driving gear are meshed with each other. When the motor is started, the driving gear will accurately drive the driven gear to rotate, thereby driving the sliding sleeve to rotate. Controlling the rotation of the sliding sleeve by the motor not only makes the operation easier, but also significantly improves the accuracy of control, bringing users a more stable and reliable zoom experience.

Preferably, a limit rod is fixed on the outer wall of the sliding sleeve, and a left limit plate and a right limit plate are fixed on the base, and the left limit plate and the right limit plate can block the limit rod. The function of the left limit plate and the right limit plate is to effectively block the limit rod, thereby ensuring that the sliding sleeve can stop accurately when rotating to a preset position, preventing the front mirror frame and the rear mirror frame from exceeding their limit positions.

Preferably, a power-off switch is installed on both the left limit plate and the right limit plate, and the power-off switch can cut off the power to the motor. When the limit rod touches the left limit plate or the right limit plate, the limit rod will immediately trigger the power-off switch to quickly cut off the power supply to the motor, which eliminates the time error that may be caused by manual operation and can effectively prevent damage to the motor.

It can be seen from the above technical solutions that the advantages of the present invention are: during the zooming process, the guide pins are precisely guided by the cam curve grooves to drive the front lens frame and the rear lens frame to slide smoothly inside the lens barrel, thereby realizing the zooming function. At the same time, the first rolling bearing rolls on the outer cylindrical surface of the lens barrel, and the second rolling bearing rolls on the base and the retaining ring. This means that rolling friction is formed between the inner wall of the sliding sleeve and the outer cylindrical surface of the lens barrel, and between the end face of the sliding sleeve and the base and the retaining ring. Since rolling friction has a smaller contact area, it has lower requirements on the processing accuracy of the lens barrel and the sliding sleeve compared to sliding friction, thereby effectively reducing the manufacturing cost. In addition, the characteristics of rolling friction make the friction surface more wear-resistant, significantly extending the service life of the product. In summary, the continuous zoom lens does not require very high processing accuracy, has low manufacturing cost, is not prone to breakage, and has higher reliability and durability.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solution of the present invention, the drawings required for use in the description will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

FIG1 is a schematic structural diagram of a specific embodiment of the present invention.

FIG. 2 is a first structural schematic diagram of a sliding sleeve in a specific embodiment of the present invention.

FIG. 3 is a partial enlarged view of point A in FIG. 2 .

FIG. 4 is a second structural schematic diagram of the sliding sleeve in a specific embodiment of the present invention.

FIG5 is a cross-sectional view of a specific embodiment of the present invention.

FIG. 6 is a schematic diagram of the structure of a motor in a specific implementation manner of the present invention.

Description of main reference numerals

In the figure: 1. sliding sleeve, 2. first rolling bearing, 3. second rolling bearing, 4. motor, 5. driving gear, 6. guide pin, 7. retaining ring, 8. rear mirror frame, 9. front mirror frame, 10. lens barrel, 11. limit rod, 12. left limit plate, 13. right limit plate, 14. driven gear, 15. power off switch, 16. base, 17. linear slide groove, 18. cam curve groove.

DETAILED DESCRIPTION

In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical scheme of the present invention will be clearly and completely described below in conjunction with the drawings in this specific embodiment. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of them. Based on the embodiments in this patent, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this patent.

A continuous zoom lens includes a lens barrel 10, as shown in FIG1 , a base 16 is fixed to one end of the lens barrel 10, and the base 16 and the lens barrel 10 are integrally formed. A front lens frame 9 and a rear lens frame 8 are arranged inside the lens barrel 10, and lenses are mounted on the front lens frame 9 and the rear lens frame 8, and the front lens frame 9 and the rear lens frame 8 can slide along the axis of the lens barrel 10. A sliding sleeve 1 is sleeved on the outer circumferential surface of the lens barrel 10, and the sliding sleeve 1 is coaxial with the lens barrel 10. By rotating the sliding sleeve 1, the sliding of the front lens frame 9 and the rear lens frame 8 can be controlled.

As shown in FIG5 , in this specific embodiment, the lens barrel 10 specifically adopts the following structure: the other end of the lens barrel 10 is provided with a retaining ring 7, which is fixed on the end face of the lens barrel 10 by bolts, and the retaining ring 7 can effectively constrain the sliding sleeve 1 to prevent the sliding sleeve 1 from being dislocated during the rotation process. The lens barrel 10 is provided with a linear slide 17, which runs through the outer wall of the lens barrel 10, and the length direction of the linear slide 17 is the same as the axis direction of the lens barrel 10, and the linear slide 17 is provided with at least two, and all the linear slides 17 are evenly distributed around the axis of the lens barrel 10. In this embodiment, there are six linear slides 17, and the six linear slides 17 are evenly distributed around the axis of the lens barrel 10. The front mirror frame 9 and the rear mirror frame 8 are both provided with guide pins 6, one end of the guide pins 6 is firmly connected to the side walls of the front mirror frame 9 and the rear mirror frame 8 by threads, and the other end of the guide pins 6 is clamped in the linear slide 17. By accurately controlling the sliding of the guide pin 6 in the linear slide groove 17, the positions of the front lens frame 9 and the rear lens frame 8 in the lens barrel 10 can be effectively adjusted to achieve precise sliding control.

The base 16 of the lens barrel 10 is provided with a motor 4, which is fixed to the base 16 by bolts, and a driving gear 5 is installed on the output shaft of the motor 4. As shown in FIG6 , when the motor 4 is started, the output shaft and the driving gear 5 will rotate synchronously. The base 16 is also provided with a left limit plate 12 and a right limit plate 13, which are respectively located on both sides of the base 16, and a power-off switch 15 is installed on the left limit plate 12 and the right limit plate 13, and a spring is installed inside the power-off switch 15. Once the spring is compressed, the motor 4 will be immediately powered off.

In this specific embodiment, the sleeve 1 specifically adopts the following structure: a cavity is provided on the inner wall at both ends of the sleeve 1, and a first rolling bearing 2 is installed in the cavity. As shown in FIG2 , the axis of the first rolling bearing 2 is parallel to the axis of the sleeve 1, and the outer ring surface of the first rolling bearing 2 abuts against the outer cylindrical surface of the lens barrel 10. At least six first rolling bearings 2 are provided. In this embodiment, a total of six first rolling bearings 2 are provided, of which three first rolling bearings 2 are located at one end of the sleeve 1, and the other three first rolling bearings 2 are located at the other end of the sleeve 1, and the six first rolling bearings 2 are evenly distributed around the axis of the sleeve 1. A cavity is also provided on the end surface at both ends of the sleeve 1, and a second rolling bearing 3 is installed in the cavity. As shown in FIG4 , the axis of the second rolling bearing 3 is perpendicular to the axis of the sleeve 1, and the outer ring surface of the second rolling bearing 3 on the end surface of the sleeve 1 close to the base 16 abuts against the base 16, and the outer ring surface of the second rolling bearing 3 on the end surface of the sleeve 1 close to the retaining ring 7 abuts against the retaining ring 7. At least six second rolling bearings 3 are also provided. In the present embodiment, a total of six second rolling bearings 3 are provided, of which three second rolling bearings 3 are located on the end face of the sleeve 1 close to the base 16, and the other three second rolling bearings 3 are located on the end face of the sleeve 1 close to the retaining ring 7, and the six second rolling bearings 3 are evenly distributed around the axis of the sleeve 1.

A cam curve groove 18 is provided on the outer wall of the sliding sleeve 1, and the cam curve groove 18 runs through the outer wall of the sliding sleeve 1. The number of the cam curve grooves 18 is adapted to the guide pin 6. The curvature of the cam curve groove 18 is accurately calculated based on the predetermined sliding distance of the front mirror frame 9 and the rear mirror frame 8, and the end of the guide pin 6 away from the front mirror frame 9 and the rear mirror frame 8 passes through the linear sliding groove 17 and is installed in the cam curve groove 18.

As shown in FIG3 , a driven gear 14 is installed at one end of the sleeve 1 close to the base 16. The driven gear 14 is fixed on the outer wall of the sleeve 1, and the driven gear 14 is meshed with the driving gear 5 on the motor 4. In addition, a limit rod 11 is provided on the outer wall of the sleeve 1. The limit rod 11 is fixed on the outer wall of the sleeve 1 by bolts, and the height of the limit rod 11 is matched with the left limit plate 12 and the right limit plate 13. When the limit rod 11 rotates to the left limit plate 12 or the right limit plate 13, the left limit plate 12 or the right limit plate 13 can block the limit rod 11.

The specific use process of the present invention is as follows: when a zoom operation is required, the motor 4 is first started, and the driving gear 5 then drives the driven gear 14 to rotate, and the driven gear 14 and the sliding sleeve 1 realize synchronous rotation. In this process, the guide pin 6 starts to slide under the guidance of the cam curve groove 18, and then moves in the linear slide groove 17. The sliding of the guide pin 6 then drives the front lens frame 9 and the rear lens frame 8 to slide smoothly in the lens barrel 10, thereby achieving a zoom effect. After the zoom is completed, the motor 4 is turned off. In addition, in order to ensure the accuracy and safety of the zoom process, when the guide pin 6 slides to the limit position of the linear slide groove 17, the limit rod 11 will contact the power-off switch 15 on the left limit plate 12 or the right limit plate 13, thereby compressing the spring in the power-off switch 15, so that the motor 4 is powered off in time.

It can be seen from the above embodiments that the beneficial effect of the present invention is that, during the zooming process, the guide pin is precisely guided by the cam curve groove, driving the front mirror frame and the rear mirror frame to slide smoothly inside the lens barrel, thereby realizing the zooming function. At the same time, the first rolling bearing rolls on the outer cylindrical surface of the lens barrel, and the second rolling bearing rolls on the base and the retaining ring. This means that rolling friction is formed between the inner wall of the sliding sleeve and the outer cylindrical surface of the lens barrel, and between the end face of the sliding sleeve and the base and the retaining ring. Since rolling friction has a smaller contact area, it has lower requirements on the processing accuracy of the lens barrel and the sliding sleeve compared to sliding friction, thereby effectively reducing the manufacturing cost. In addition, the characteristics of rolling friction make the friction surface more wear-resistant, significantly extending the service life of the product. In summary, the continuous zoom lens does not require very high processing accuracy, has low manufacturing cost, is not prone to breakage, and has higher reliability and durability.

The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims (9)

1. A zoom lens, comprising a lens barrel (10), characterized in that a base (16) is fixed to one end of the lens barrel (10), a sleeve (1) coaxial with the lens barrel (10) is sleeved on the outer circumferential surface of the lens barrel (10), first rolling bearings (2) are installed on the inner walls of both ends of the sleeve (1), the axis of the first rolling bearing (2) is parallel to the axis of the sleeve (1), and the outer ring surface of the first rolling bearing (2) abuts against the outer circumferential surface of the lens barrel (10); second rolling bearings (3) are installed on the end surfaces of both ends of the sleeve (1), the axis of the second rolling bearing (3) is perpendicular to the axis of the sleeve (1), and the outer ring surface of the second rolling bearing (3) on the end surface of the sleeve (1) close to the base (16) abuts against the base (16). 2. The continuous zoom lens according to claim 1, characterized in that at least six first rolling bearings (2) and at least six second rolling bearings (3) are provided, and the first rolling bearings (2) and the second rolling bearings (3) are evenly distributed around the axis of the sliding sleeve (1). 3. The continuous zoom lens according to claim 1 is characterized in that a retaining ring (7) is fixed to the other end of the lens barrel (10), and the outer ring surface of the second rolling bearing (3) on the end surface of the sliding sleeve (1) away from the base (16) abuts against the retaining ring (7). 4. The continuous zoom lens according to claim 1 is characterized in that a front lens frame (9) and a rear lens frame (8) are arranged inside the lens barrel (10), and the front lens frame (9) and the rear lens frame (8) are both able to slide along the axis of the lens barrel (10), and lenses are fixed on the front lens frame (9) and the rear lens frame (8). 5. The zoom lens according to claim 4 is characterized in that a linear slide groove (17) is provided on the lens barrel (10), the length direction of the linear slide groove (17) is the same as the axial direction of the lens barrel (10), a cam curve groove (18) is provided on the sliding sleeve (1), a guide pin (6) is provided inside the cam curve groove (18), and the guide pin (6) passes through the linear slide groove (17) and is fixedly connected to the front lens frame (9) and the rear lens frame (8) respectively. 6. The continuous zoom lens according to claim 5, characterized in that at least two linear slide grooves (17) are provided, and the linear slide grooves (17) are evenly distributed around the axis of the lens barrel (10). 7. The continuous zoom lens according to claim 1, characterized in that a motor (4) is fixed on the base (16), a driving gear (5) is fixed on the output shaft of the motor (4), a driven gear (14) is fixed on one end of the sliding sleeve (1) close to the base (16), and the driven gear (14) and the driving gear (5) are meshed with each other. 8. The continuous zoom lens according to claim 1, characterized in that a limit rod (11) is fixed on the outer wall of the sliding sleeve (1), and a left limit plate (12) and a right limit plate (13) are fixed on the base (16), and both the left limit plate (12) and the right limit plate (13) can block the limit rod (11). 9. The continuous zoom lens according to claim 8, characterized in that a power-off switch (15) is installed on both the left limit plate (12) and the right limit plate (13), and the power-off switch (15) can cut off the power to the motor (4).