WO2021244144A1

WO2021244144A1 - Prime lens adjusting mechanism

Info

Publication number: WO2021244144A1
Application number: PCT/CN2021/086997
Authority: WO
Inventors: 胡伟
Original assignee: 广东奥普特科技股份有限公司
Priority date: 2020-06-01
Filing date: 2021-04-13
Publication date: 2021-12-09
Also published as: CN111522116A

Abstract

A prime lens adjusting mechanism, comprising an optical device and a mechanical device. The optical device comprises a fixed set (1) and a width adjusting set (2) which are successively arranged from an object side to an image side; the mechanical device comprises a front lens base (3) and a rear lens base (4) mounted in the front lens base (3); the fixed set (1) is mounted on the front lens base (3); the width adjusting set (2) is mounted on the rear lens base (4); a guide nail (41) is mounted on the side portion of the rear lens base (4); the side portion of the front lens base (3) is sleeved with a focusing ring (5); the focusing ring (5) is provided with a curved groove (51) matching the guide nail (41); the curved groove (51) drives, by means of the guide nail (41), the width adjusting set (2) to move back and forth.

Description

Fixed focus lens adjustment mechanism

This application claims the priority of the Chinese patent application whose application date is June 1, 2020 and the application number is 202010484973.2. The entire content of this application is incorporated into this application by reference.

Technical field

This application belongs to the field of optical lens technology, for example, it relates to a fixed-focus lens adjustment mechanism.

Background technique

With the development of the Made in China 2025 strategy and the rapid development of industrial automation, machine vision has been widely used in manufacturing, quality inspection, logistics, medicine, scientific research and other fields to measure, judge and detect defects in target parts to reduce Or to eliminate the misjudgment during human operation and improve the measurement accuracy and stability. As the "eye" of machine vision, the lens occupies an important position. In electronic product manufacturing such as LCD screen defect detection, mobile phone touch screen circuit and other application scenarios, the requirements for fixed focus lens are getting higher and higher.

The existing lens can only adjust all lens groups at the same time, and cannot adjust part of the lens groups, which reduces the flexibility of the lens.

Summary of the invention

The present application provides a fixed-focus lens adjustment mechanism, which can independently drive part of the lens group to move, which helps to improve the flexibility of the lens, thereby improving user experience.

An embodiment provides a fixed-focus lens adjustment mechanism, including an optical device and a mechanical device. The optical device includes a fixed group and a widening group arranged in sequence from the object side to the image side. The mechanical device includes a front lens holder and a mounting In the rear lens holder in the front lens holder, the fixing group is installed on the front lens holder, the width adjusting group is installed on the rear lens holder, and the side of the rear lens holder is equipped with guide nails, A focusing ring is sleeved on the side of the front lens seat, and a curved groove matching the guide nail is provided on the focusing ring, and the curved groove drives the widening group to move forward and backward through the guide nail .

Optionally, a guide hole is provided on the front mirror base, and the guide hole extends along the moving direction of the guide nail.

Optionally, the curved groove is arranged around the side wall of the focusing ring.

Optionally, a cavity is provided at the end of the front lens holder, the rear lens holder is accommodated in the cavity, and the length of the front lens holder is greater than the length of the rear lens holder.

Optionally, an extinction ring and an iris diaphragm are sequentially arranged between the fixed group and the widening group.

Optionally, the fixed group includes a front pressure ring, a first lens, a first spacer, a second lens, a third lens, a first cemented lens, a second spacer, and a sixth lens arranged in sequence along the optical axis.

Optionally, the width adjustment group includes a seventh lens, a third spacer, a second cemented lens, a fourth spacer, a third cemented lens, a fifth spacer, an eighth lens, and a rear lens arranged in sequence along the optical axis. Pressure ring.

Optionally, it further includes a fixed barrel and a light adjusting ring, the fixed barrel is sleeved outside the focusing ring, the light adjusting ring is sleeved outside the fixed barrel, and the end of the light adjusting ring is installed with an interface.

Optionally, both ends of the front lens holder are respectively provided with locking nails, and one of the two locking nails located at both ends of the front lens holder abuts through the focusing ring In the front lens holder, another locking nail passes through the dimming ring and abuts against the fixed barrel.

Optionally, the number of the guide nails ranges from 2-6, and a plurality of guide nails are arranged around the rear lens base.

Description of the drawings

FIG. 1 is a schematic cross-sectional structure diagram of a fixed-focus lens adjusting mechanism according to an embodiment of the application.

FIG. 2 is an exploded schematic diagram of a fixed-focus lens adjusting mechanism according to an embodiment of the application.

3 is an exploded schematic diagram of a cross-sectional view of a fixed-focus lens adjusting mechanism according to an embodiment of the application.

4 is an exploded cross-sectional schematic diagram of the front lens holder of the fixed-focus lens adjusting mechanism according to an embodiment of the application.

5 is an exploded cross-sectional schematic diagram of the rear lens holder of the fixed-focus lens adjusting mechanism according to an embodiment of the application.

Among them: 1- fixed group; 2- widening group; 3- front lens holder; 4- rear lens holder; 11- front pressure ring; 12- first lens; 13- first spacer ring; 14- second lens; 15-third lens; 16-first cemented lens; 17-second spacer; 18-sixth lens; 21-seventh lens; 22-third spacer; 23-second cemented lens; 24-fourth Spacer; 25-third cemented lens; 26-fifth spacer; 27-eighth lens; 28-rear pressure ring; 41-guide nail; 5-focus ring; 51-curve groove; 6-guide hole; 7-cavity; 8-dimmer ring; 9- iris diaphragm; 10-fixed tube; 20-dimmer ring; 201-interface; 30-locking nail.

detailed description

For example, certain words are used in the specification and claims to refer to specific components. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. This specification and claims do not use differences in names as a way of distinguishing components, but use differences in functions of components as a criterion for distinguishing. If the "include" mentioned in the entire specification and claims is an open term, it should be interpreted as "include but not limited to". "Approximately" means that within an acceptable error range, those skilled in the art can solve technical problems within a certain error range and basically achieve technical effects.

In the description of this application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", and horizontal are based on the attached drawings. The orientation or positional relationship shown is only for the convenience of describing the application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a reference to this application. limits.

In the application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and other terms should be interpreted broadly. For example, it may be a fixed connection or a detachable connection. Or integrally connected; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal communication between the two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

The application will be further described in detail below in conjunction with accompanying drawings 1-5, but it is not intended to limit the application.

Embodiment 1

A fixed-focus lens adjustment mechanism, including an optical device and a mechanical device. The optical device includes a fixed group 1 and a widening group 2 arranged in sequence from the object side to the image side. The mechanical device includes a front lens holder 3 and mounted on the front lens holder 3 The inner rear mirror holder 4, the fixed group 1 is installed on the front mirror holder 3, the widening group 2 is installed on the rear mirror holder 4, the side of the rear mirror holder 4 is installed with guide nails 41, and the side of the front mirror holder 3 is sleeved There is a focusing ring 5, the focusing ring 5 is provided with a curved groove 51 matching the guide nail 41, and the curved groove 51 drives the width adjustment group 2 to move back and forth through the guide nail 41. Because the existing lens can only adjust all lens groups at the same time, and cannot adjust some lens groups, the flexibility of the lens is reduced. Therefore, fix the fixed group 1 on the front part of the front lens holder 3 to ensure the position of the fixed group 1. There is no change. At the same time, install the width adjustment group 2 in the rear mirror holder 4, and install the rear mirror holder 4 in the front mirror holder 3. The front mirror holder 3 provides space for the rear mirror holder 4 to move forward and backward. A guide nail 41 is installed on the side of the seat 4, and a focusing ring 5 is sleeved on the side of the front mirror seat 3. The focusing ring 5 is provided with a curved groove 51 matching the guide nail 41, and the curved groove 51 passes through the guide nail 41. Drive the width adjustment group 2 to move back and forth, that is, enable the width adjustment group 2 to move back and forth. By changing the position of the width adjustment group 2 to adjust the imaging field of view, it is helpful to improve the flexibility of the lens and improve the user experience.

Among them, the focus ring 5 passes through the curved groove 51 to convert the rotational motion into the linear motion of the rear mirror holder 4, that is, into the linear motion of the width adjustment group 2, ensuring that the width adjustment group 2 moves along the optical axis, and realizes the control of the width adjustment. Group 2 moves back and forth. The width adjustment group 2 is installed on the rear lens holder 4, which is equivalent to a short focal lens. By changing the position of the width adjustment group 2, the imaging field of view can be adjusted; the end of the guide nail 41 is provided with a guide sleeve to avoid the guide nail The large displacement of 41 helps to improve the stability of the guide pin 41.

Optionally, a guide hole 6 is provided on the front mirror base 3, and the guide hole 6 extends along the moving direction of the guide nail 41. The guide hole 6 is added to facilitate the guide pin 41 to pass through the guide hole 6 and be fixed to the rear lens holder 4. When the focusing ring 5 rotates, the curved groove 51 drives the rear lens holder 4 to move forward and backward through the guide nail 41, and the guide hole 6 extends along the The extension of the movement direction of the guide pin 41 ensures that the guide pin 41 moves back and forth, prevents the guide pin 41 from shaking left and right, which affects the adjustment accuracy of the lens, and ensures that the width adjustment group 2 moves along the optical axis, which helps improve the accuracy of lens adjustment. In this embodiment, the rear mirror base 4 is provided with a mounting hole that matches with the guide hole 6, and the guide nail 41 is threadedly connected to the mounting hole, but the present application is not limited to this, and the guide nail 41 and the rear mirror base 4 can also be used For other fixed connection methods, it is sufficient to fix the guide nail 41 to the rear mirror base 4.

Optionally, a cavity 7 is provided at the end of the front mirror holder 3, and the rear mirror holder 4 is accommodated in the cavity 7. The cavity 7 is added to provide space for the rear mirror holder 4 to move back and forth, which is helpful to realize the separate control of the width adjustment group 2 to move forward and backward. The inner diameter of the cavity 7 matches the outer diameter of the rear mirror holder 4 to reduce the rear mirror holder 4 The possibility of shaking in the front lens mount 3 ensures that the widening group 2 moves along the optical axis, which helps to improve the accuracy of lens adjustment.

Optionally, an iris 9 is provided between the fixed group 1 and the widening group 2. The iris diaphragm 9 refers to a structure that limits the light beam in the optical system. The user can adjust the position of the iris diaphragm 9 according to actual imaging requirements to achieve a better imaging effect.

Optionally, the fixed group 1 includes a first lens 12, a second lens 14, a third lens 15, a first cemented lens 16, and a sixth lens 18 that are sequentially arranged along the optical axis. The addition of the first cemented lens 16 is conducive to the control of aberrations and chromatic aberrations in the optical system, thereby improving the imaging effect of the fixed focus lens, but the application is not limited to this, and the order of the lenses can be adjusted according to actual imaging requirements. Achieve better imaging results.

Optionally, the width-adjusting group 2 includes a seventh lens 21, a second cemented lens 23, a third cemented lens 25, and an eighth lens 27 that are sequentially arranged along the optical axis. The addition of the second cemented lens 23 and the third cemented lens 25 facilitates the control of aberrations and chromatic aberrations in the optical system, thereby improving the imaging effect of the fixed-focus lens, but the application is not limited to this, and can be based on actual imaging requirements. Adjust the order of the lenses to achieve a better imaging effect.

Optionally, the fixed-focus lens adjustment mechanism further includes a fixed tube 10 and a light adjusting ring 20, the fixed tube 10 is sleeved outside the focusing ring 5, the light adjusting ring 20 is sleeved outside the fixed tube 10, and the end of the light adjusting ring 20 is installed Interface 201. The fixed barrel 10 ensures that the focusing ring 5 cannot move along the optical axis when it rotates around the front lens base 3. At the same time, the surface of the fixed barrel 10 has scales for calibrated focusing ring 5 and light adjusting ring 20 to facilitate the operation of the fixed focus lens , Reduce operation error.

Optionally, the number of the guide nails 41 is two, and the two guide nails 41 are arranged around the rear mirror base 4. Limit the number of guide nails 41 to a minimum, to prevent the number of guide nails 41 from being too small, causing the curved groove 51 to be unable to stably drive the width adjustment group 2 back and forth through the guide nails 41; two guide nails 41 are arranged around the rear mirror base 4 , To ensure that the guide nails 41 in multiple directions of the rear lens base 4 can simultaneously drive the width adjustment group 2 to move forward and backward, to ensure that the width adjustment group 2 moves along the optical axis, which helps to improve the accuracy of lens adjustment.

Because the existing lens can only adjust all lens groups at the same time, and cannot adjust some lens groups, the flexibility of the lens is reduced. Therefore, fix the fixed group 1 on the front part of the front lens holder 3 to ensure the position of the fixed group 1. There is no change. At the same time, install the width adjustment group 2 in the rear mirror holder 4, and install the rear mirror holder 4 in the front mirror holder 3. The front mirror holder 3 provides space for the rear mirror holder 4 to move forward and backward. A guide nail 41 is installed on the side of the seat 4, and a focusing ring 5 is sleeved on the side of the front mirror seat 3. The focusing ring 5 is provided with a curved groove 51 matching the guide nail 41, and the curved groove 51 passes through the guide nail 41. Drive the width adjustment group 2 to move forward and backward, that is, enable the width adjustment group 2 to move forward and backward. By changing the position of the width adjustment group 2 to adjust the imaging field of view, it helps to improve the flexibility of the lens and improve the user experience.

When the focus ring 5 rotates, it drives the curved groove 51 to rotate, which converts the rotary motion into the linear motion of the rear mirror mount 4, that is, into the linear motion of the width adjustment group 2, ensuring that the width adjustment group 2 moves along the optical axis to achieve control The width adjustment group 2 moves back and forth, and the guide hole 6 extends along the moving direction of the guide nail 41 to ensure that the guide nail 41 moves back and forth, affects the adjustment accuracy of the lens, and ensures that the width adjustment group 2 moves along the optical axis.

Embodiment 2

The difference from Embodiment 1 is that the length of the front lens holder 3 in this embodiment is greater than the length of the rear lens holder 4. The fixed group 1 includes a front pressing ring 11, a first lens 12, and a first spacer which are arranged in sequence along the optical axis. 13. The second lens 14, the third lens 15, the first cemented lens 16, the second spacer 17 and the sixth lens 18, an extinction ring 8 and an iris diaphragm are arranged in sequence between the fixed group 1 and the widening group 2 9. The number of guide pins 41 is six. The length of the front lens holder 3 is greater than the length of the rear lens holder 4, which facilitates the formation of a space on the front lens holder 3 for the rear lens holder 4 to move back and forth; The focal lens fails; the first spacer 13 and the second spacer 17 can ensure sufficient distance between the lenses to improve the imaging effect of the optical system; limit the number of guide pins 41 to the maximum to prevent excessive number of guide pins 41 , Resulting in increased production costs of the lens.

The other structure is the same as that of Embodiment 1, and will not be repeated here.

Implementation Mode 3

The difference from the first embodiment is that the curved groove 51 of this embodiment is arranged around the side wall of the focusing ring 5, and the width adjustment group 2 includes a seventh lens 21, a third spacer 22, and a second glue which are arranged in sequence along the optical axis. The lens 23, the fourth spacer 24, the third cemented lens 25, the fifth spacer 26, the eighth lens 27, and the back pressure ring 28, both ends of the front lens holder 3 are provided with locking nails 30, one of which is locked The nail 30 passes through the focusing ring 5 and abuts against the front lens base 3, and the other locking nail 30 passes through the light adjustment ring 20 and abuts against the fixed barrel 10. The number of guide nails 41 is four. The curved groove 51 is arranged around the side wall of the focusing ring 5, and is arranged to convert the rotary motion of the focusing ring 5 into linear motion of the guide nail 41, and the guide nail 41 drives the rear mirror holder 4 to move forward and backward; the rear pressing ring 28 plays a role The role of the fixed lens prevents the lens from shifting and causes the fixed focus lens to fail; the third spacer 22, the fourth spacer 24 and the fifth spacer 26 can ensure sufficient distance between the lenses, thereby improving the imaging effect of the optical system; Limit the number of guide pins 41 to an intermediate value to meet the requirements of reducing the production cost of the lens. At the same time, it is ensured that the curved groove 51 is stably driven by the guide pins 41 to drive the width adjustment group 2 back and forth to reduce the probability of the rear lens mount 4 shaking and ensure the width adjustment Group 2 moves in the direction of the optical axis.

The fixed-focus lens adjustment mechanism provided in this application includes an optical device and a mechanical device. The optical device includes a fixed group 1 and a widening group 2 arranged in sequence from the object side to the image side. The mechanical device includes a front lens holder 3 and a mounting In the rear lens holder 4 in the front lens holder 3, the fixed group 1 is installed on the front lens holder 3, the width adjustment group 2 is installed on the rear lens holder 4, and the rear lens holder 4 A guide nail 41 is installed on the side, a focusing ring 5 is sleeved on the side of the front lens holder 3, and a curved groove 51 matching the guide nail 41 is provided on the focusing ring 5, and the curved groove 51 drives the width adjustment group 2 to move back and forth through the guide nails 41. Because the existing lens can only adjust all lens groups at the same time, and cannot adjust some lens groups, the flexibility of the lens is reduced. Therefore, fix the fixed group 1 on the front part of the front lens holder 3 to ensure the position of the fixed group 1. There is no change. At the same time, install the width adjustment group 2 in the rear mirror holder 4, and install the rear mirror holder 4 in the front mirror holder 3. The front mirror holder 3 provides space for the rear mirror holder 4 to move forward and backward. A guide nail 41 is installed on the side of the seat 4, and a focusing ring 5 is sleeved on the side of the front mirror seat 3. The focusing ring 5 is provided with a curved groove 51 matching the guide nail 41, and the curved groove 51 passes through the guide nail 41. Drive the width adjustment group 2 to move back and forth, that is, enable the width adjustment group 2 to move back and forth. By changing the position of the width adjustment group 2 to adjust the imaging field of view, it is helpful to improve the flexibility of the lens and improve the user experience. Among them, the focus ring 5 passes through the curved groove 51 to convert the rotational motion into the linear motion of the rear mirror holder 4, that is, into the linear motion of the width adjustment group 2, ensuring that the width adjustment group 2 moves along the optical axis, and realizes the control of the width adjustment. Group 2 exercises back and forth. The present application can independently drive part of the lens group to move, which helps to improve the flexibility of the lens, thereby improving the user experience.

Claims

A fixed-focus lens adjustment mechanism includes an optical device and a mechanical device. The optical device includes a fixed group (1) and a widening group (2) arranged in sequence from the object side to the image side. The mechanical device includes a front lens seat (3) and a rear lens holder (4) installed in the front lens holder (3), the fixing group (1) is installed on the front lens holder (3), and the width adjustment group (2) is installed On the rear lens holder (4), a guide nail (41) is installed on the side of the rear lens holder (4), and a focusing ring (5) is sleeved on the side of the front lens holder (3), The focusing ring (5) is provided with a curved groove (51) matching the guide nail (41), and the curved groove (51) drives the widening group (2) through the guide nail (41). ) Back and forth movement.
The fixed-focus lens adjustment mechanism according to claim 1, wherein: the front lens holder (3) is provided with a guide hole (6), and the guide hole (6) is along the moving direction of the guide nail (41) extend.
The fixed-focus lens adjusting mechanism according to claim 1, wherein: the curved groove (51) is arranged around the side wall of the focusing ring (5).
The fixed-focus lens adjustment mechanism according to claim 1, wherein: the end of the front lens holder (3) is provided with a cavity (7), and the rear lens holder (4) is accommodated in the cavity ( In 7), the length of the front lens holder (3) is greater than the length of the rear lens holder (4).
The fixed-focus lens adjustment mechanism according to claim 1, wherein: an extinction ring (8) and an iris diaphragm (9) are sequentially arranged between the fixed group (1) and the widening group (2).
The fixed-focus lens adjustment mechanism according to claim 1, wherein: the fixed group (1) comprises a front pressing ring (11), a first lens (12), and a first spacer (13) arranged in sequence along the optical axis , The second lens (14), the third lens (15), the first cemented lens (16), the second spacer (17) and the sixth lens (18).
The fixed-focus lens adjustment mechanism according to claim 1, wherein: the widening group (2) includes a seventh lens (21), a third spacer (22), and a second cemented lens ( 23), the fourth spacer (24), the third cemented lens (25), the fifth spacer (26), the eighth lens (27) and the back pressure ring (28).
The fixed-focus lens adjustment mechanism according to claim 1, further comprising a fixed tube (10) and a light adjusting ring (20), the fixed tube (10) is sleeved outside the focusing ring (5), and the adjusting The light ring (20) is sleeved outside the fixed barrel (10), and an interface (201) is installed at the end of the light adjusting ring (20).
The fixed-focus lens adjustment mechanism according to claim 8, wherein: the two ends of the front lens holder (3) are respectively provided with locking nails (30), and the two ends of the front lens holder (3) are respectively provided with locking nails (30). One of the locking nails (30) passes through the focusing ring (5) and abuts on the front lens holder (3), and the other locking nail (30) passes through The dimming ring (20) abuts against the fixed cylinder (10).
The fixed-focus lens adjustment mechanism according to claim 1, wherein: the number of the guide pins (41) ranges from 2-6, and a plurality of guide pins (41) are arranged around the rear lens base (4).