An objective lens with an image sensor and automatic focusing

Abstract

The utility model discloses a kind of objective lens with image sensor and can be automatically focused, including objective lens barrel, several pieces of objective lens, image sensor, sliding device and driving device, image sensor is located at the rear of objective lens barrel, light reflected by scene is refracted on image sensor by several pieces of objective lens and forms real image;Sliding device is installed in the tail of objective lens barrel, support connection is installed on sliding device, driving device is used to drive sliding device to drive image sensor to move along optical axis L front and back and realize automatic focusing;When the image shown by image sensor is not clear, the mainboard of image sensor will send a focusing signal to driving device, driving device drives sliding device and image sensor to move along optical axis L front and back and realize automatic focusing, when the image shown by image sensor is clear, driving device stops working.It greatly simplifies the structure of objective lens barrel, reduces manufacturing cost and manufacturing difficulty.

Description

Technical Field

[0001] This utility model relates to an objective lens with an image sensor and automatic focusing capability, which can be used in telescopes, night vision devices, or rifle aiming systems. Background Technology

[0002] An objective lens with an image sensor and automatic focusing capability generally includes an objective lens barrel, several objective lens elements, and an image sensor. The objective lens elements are mounted inside the objective lens barrel and arranged at intervals along the optical axis. The image sensor is located behind the objective lens barrel. Light reflected from objects in front of the objective lens barrel is refracted by the objective lens elements and forms a real image on the image sensor. Traditionally, focusing of this type of objective lens is achieved by a drive mechanism that moves one or more of the objective lens elements back and forth along the optical axis. For details, please refer to the utility model patent with patent number CN202010229207, entitled "A Zoom Adjustment Mechanism for an Electronic Endoscope Imaging Objective Lens."

[0003] This type of objective lens with an image sensor and autofocus has a complex adjustment structure and high manufacturing cost because it uses a drive mechanism inside the lens barrel to adjust the movement of the objective lens along the optical axis. Summary of the Invention

[0004] This invention provides an objective lens with an image sensor and autofocus capability, which solves the technical problem that existing objective lenses with image sensors and autofocus capability rely on a drive mechanism to adjust the lens elements to move back and forth along the optical axis, resulting in a complex objective lens structure and high manufacturing costs.

[0005] The technical solution of this utility model is implemented as follows:

[0006] An objective lens with an image sensor and capable of autofocus, comprising:

[0007] One objective lens tube;

[0008] Several objective lens elements are installed inside the objective lens tube and arranged at intervals along the optical axis L;

[0009] An image sensor is mounted on a bracket. The image sensor is located behind the objective lens tube. Light reflected from the scene in front of the objective lens tube is refracted by several objective lens elements to form a real image on the image sensor.

[0010] Its features include: it further includes a sliding device and a driving device, the sliding device is installed at the tail of the objective lens barrel, the bracket is connected and installed on the sliding device, and the driving device is used to drive the sliding device to move the image sensor back and forth along the optical axis L to achieve automatic focusing;

[0011] When the image displayed by the image sensor is not clear, the mainboard of the image sensor sends a focusing signal to the drive unit. The drive unit drives the sliding device and the image sensor to move back and forth along the optical axis L to achieve automatic focusing. When the image displayed by the image sensor is clear, the drive unit stops working.

[0012] Preferably, the sliding device includes a guide post and a focusing tube. A cylindrical boss protrudes from the tail of the objective lens tube, and the focusing tube is fitted onto the cylindrical boss. A mounting ring protrudes from the outer side of the middle part of the focusing tube, and a guide hole is provided on the mounting ring. One end of the guide post is installed at the tail of the objective lens tube, and the guide hole on the mounting ring passes through the middle part of the guide post.

[0013] Preferably, the driving device includes a motor, a screw, a motor mounting bracket, a connecting bracket, and a focusing bracket. The motor mounting bracket is fixedly installed at the tail of the objective lens barrel. The motor is connected to the drive screw. The motor and the screw are mounted on the motor mounting bracket. The focusing bracket is connected to the mounting ring on the outside of the focusing tube. The connecting bracket is mounted on the focusing bracket. The connecting bracket is provided with a threaded groove. The screw is threaded into the threaded groove so that the screw and the connecting bracket form a screw-nut mechanism.

[0014] Preferably, there are two mounting rings spaced apart, forming a slot between the two mounting rings, and the focusing bracket is nested and installed in the slot.

[0015] Preferably, a limiting mechanism is also installed at the tail of the objective lens tube. The limiting mechanism includes a limiting induction switch bracket, an induction switch, and a sensor. The induction switch is installed on the limiting induction switch bracket. The induction switch is used to cut off or close the power supply to the motor. The sensor is installed in the slot between the two mounting rings of the focusing tube. The limiting induction switch bracket is installed at the tail of the objective lens tube.

[0016] Preferably, a positioning cylinder is fitted over the sliding device, one end of which is installed at the tail of the objective lens tube. A notch is provided on the side of the positioning cylinder, and the connecting bracket passes through the notch to connect with the mounting ring.

[0017] Preferably, the objective lens comprises objective lens one, objective lens two, objective lens three, objective lens four, objective lens five, objective lens six, objective lens seven and objective lens eight; objective lens seven and objective lens eight are glued together.

[0018] Compared with the prior art, this utility model has the following advantages:

[0019] 1. This utility model includes an objective lens barrel, several objective lens elements, an image sensor, a sliding device, and a driving device. The sliding device is installed at the rear of the objective lens barrel, and a bracket is connected to and installed on the sliding device. The driving device drives the sliding device to move the image sensor back and forth along the optical axis L to achieve automatic focusing. When the image displayed by the image sensor is not clear, the mainboard of the image sensor sends a focusing signal to the driving device, which then drives the sliding device and the image sensor to move back and forth along the optical axis L to achieve automatic focusing. When the image displayed by the image sensor is clear, the driving device stops working. This focusing principle can greatly simplify the structure of the objective lens barrel and reduce manufacturing costs and difficulties.

[0020] 2. Other advantages of this utility model are described in detail in the embodiments section. Attached Figure Description

[0021] Figure 1 This is a perspective view of the present invention from one angle;

[0022] Figure 2 This is the front view of the present invention;

[0023] Figure 3 This is an exploded view of the present invention from one angle;

[0024] Figure 4 This is an exploded view of the present invention from another angle;

[0025] Figure 5 This is a partial exploded view of the present invention;

[0026] Figure 6 This is a side view of the present invention;

[0027] Figure 7 yes Figure 6 AA section view;

[0028] Figure 8 yes Figure 7 A magnified view of part B;

[0029] Figure 9 This is the optical path diagram of this utility model. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0031] like Figures 1 to 9 As shown, this embodiment provides an objective lens with an image sensor and autofocus capability, comprising:

[0032] Objective tube 1;

[0033] Several objective lens elements 2 are installed inside the objective lens tube 1 and arranged at intervals along the optical axis L;

[0034] An image sensor 3 is mounted on a bracket 4. The image sensor 3 is located behind the objective lens tube 1. Light reflected from the scene in front of the objective lens tube 1 is refracted by several objective lens lenses 2 and forms a real image on the image sensor 3.

[0035] Its features include: it further includes a sliding device 5 and a driving device 6. The sliding device 5 is installed at the tail of the objective lens barrel 1, and the bracket 4 is connected and installed on the sliding device 5. The driving device 6 is used to drive the sliding device 5 to move the image sensor 3 back and forth along the optical axis L to achieve automatic focusing.

[0036] When the image displayed by the image sensor 3 is not clear, the main board 31 of the image sensor 3 will send a focusing signal to the drive device 6. The drive device 6 drives the sliding device 5 and the image sensor 3 to move back and forth along the optical axis L to achieve automatic focusing. When the image displayed by the image sensor 3 is clear, the drive device 6 stops working.

[0037] The working principle of this invention is to use a driving device to drive a sliding device to move the image sensor back and forth along the optical axis L to achieve automatic focusing. When the image displayed by the image sensor is not clear, the mainboard of the image sensor sends a focusing signal to the driving device, which then drives the sliding device and the image sensor to move back and forth along the optical axis L to achieve automatic focusing. When the image displayed by the image sensor is clear, the driving device stops working. This focusing principle can greatly simplify the structure of the objective lens barrel and reduce manufacturing costs and difficulties.

[0038] Preferably, the sliding device 5 includes a guide post 51 and a focusing tube 52. A cylindrical boss 11 protrudes from the tail of the objective lens tube 1, and the focusing tube 52 is fitted onto the cylindrical boss 11. A mounting ring 521 protrudes from the outer side of the middle part of the focusing tube 52, and a guide hole 5211 is provided on the mounting ring 521. One end of the guide post 51 is installed at the tail of the objective lens tube 1, and the guide hole 5211 on the mounting ring 521 passes through the middle part of the guide post 51. The structure is simple and easy to install.

[0039] Preferably, the drive device 6 includes a motor 61, a screw 62, a motor mounting bracket 63, a connecting bracket 64, and a focusing bracket 65. The motor mounting bracket 63 is fixedly installed at the tail of the objective lens barrel 1. The motor 61 is connected to the drive screw 62. The motor 61 and the screw 62 are mounted on the motor mounting bracket 63. The focusing bracket 65 is connected to the mounting ring 521 on the outside of the focusing tube 52. The connecting bracket 64 is mounted on the focusing bracket 65. A threaded groove 641 is provided on the connecting bracket 64. The screw 62 is threaded into the threaded groove 641, so that the screw 62 and the connecting bracket 64 form a screw-nut mechanism. The structure is simple, the drive control is simple, and the control accuracy is high.

[0040] Preferably, there are two mounting rings 521 that are spaced apart, forming a slot 53 between the two mounting rings 521. The focusing bracket 65 is nested and installed in the slot 53, which is simple in structure and easy to install.

[0041] Preferably, a limiting mechanism 7 is also installed at the tail of the objective lens tube 1. The limiting mechanism 7 includes a limiting induction switch bracket 71, an induction switch 72, and a sensor 73. The induction switch 72 is installed on the limiting induction switch bracket 71 and is used to cut off or close the power supply to the motor 61. The sensor 73 is installed in the slot 53 between the two mounting rings 521 of the focusing tube 52. The limiting induction switch bracket 71 is installed at the tail of the objective lens tube 1. When the focusing tube 52 moves, when it moves to a certain position, the sensor 73 triggers the induction switch 72 to act, cutting off the power supply to the motor 61.

[0042] Preferably, a positioning cylinder 8 is fitted over the sliding device 5. One end of the positioning cylinder 8 is installed at the tail of the objective lens tube 1. A notch 81 is provided on the side of the positioning cylinder 8, and the connecting bracket 64 passes through the notch 81 and connects to the mounting ring 521. The structure is simple and the layout is reasonable.

[0043] Preferably, the plurality of objective lens elements 2 include objective lens one 21, objective lens two 22, objective lens three 23, objective lens four 24, objective lens five 25, objective lens six 26, objective lens seven 27 and objective lens eight 28; objective lens seven 27 and objective lens eight 28 are glued together.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. An objective lens with an image sensor and capable of autofocus, comprising: One objective lens tube (1); Several objective lens elements (2) are installed inside the objective lens tube (1) and arranged at intervals along the optical axis L; An image sensor (3) is mounted on a bracket (4). The image sensor (3) is located behind the objective lens tube (1). Light reflected from the scene in front of the objective lens tube (1) is refracted by several objective lens lenses (2) to form a real image on the image sensor (3). Its features include: it further includes a sliding device (5) and a driving device (6), the sliding device (5) is installed at the tail of the objective lens tube (1), the bracket (4) is connected and installed on the sliding device (5), and the driving device (6) is used to drive the sliding device (5) to drive the image sensor (3) to move back and forth along the optical axis L to achieve automatic focusing; When the image displayed by the image sensor (3) is not clear, the main board (31) of the image sensor (3) will send a focusing signal to the drive device (6). The drive device (6) drives the sliding device (5) and the image sensor (3) to move back and forth along the optical axis L to achieve automatic focusing. When the image displayed by the image sensor (3) is clear, the drive device (6) stops working.

2. The objective lens with an image sensor and capable of autofocus according to claim 1, characterized in that: The sliding device (5) includes a guide post (51) and a focusing tube (52). A cylindrical boss (11) protrudes from the tail of the objective lens tube (1). The focusing tube (52) is fitted onto the cylindrical boss (11). A mounting ring (521) protrudes from the outer side of the middle part of the focusing tube (52). A guide hole (5211) is provided on the mounting ring (521). One end of the guide post (51) is installed at the tail of the objective lens tube (1). The guide hole (5211) on the mounting ring (521) passes through the middle part of the guide post (51).

3. The objective lens with an image sensor and capable of autofocus according to claim 2, characterized in that: The drive unit (6) includes a motor (61), a screw (62), a motor mounting bracket (63), a connecting bracket (64), and a focusing bracket (65). The motor mounting bracket (63) is fixedly installed at the tail of the objective lens tube (1). The motor (61) is connected to the drive screw (62). The motor (61) and the screw (62) are mounted on the motor mounting bracket (63). The focusing bracket (65) is connected to the mounting ring (521) on the outside of the focusing tube (52). The connecting bracket (64) is mounted on the focusing bracket (65). The connecting bracket (64) is provided with a threaded groove (641). The screw (62) is threaded into the threaded groove (641) so that the screw (62) and the connecting bracket (64) form a screw and nut mechanism.

4. The objective lens with an image sensor and capable of autofocus according to claim 3, characterized in that: There are two mounting rings (521) spaced apart, forming a slot (53) between the two mounting rings (521), and the focusing bracket (65) is nested in the slot (53).

5. An objective lens with an image sensor and capable of autofocus according to claim 2, 3, or 4, characterized in that: The objective lens tube (1) is also equipped with a limiting mechanism (7). The limiting mechanism (7) includes a limiting induction switch bracket (71), an induction switch (72), and a sensor (73). The limiting induction switch bracket (71) is equipped with an induction switch (72), which is used to cut off or close the power supply of the motor (61). The sensor (73) is installed in the slot (53) between the two mounting rings (521) of the focusing tube (52). The limiting induction switch bracket (71) is installed at the tail of the objective lens tube (1).

6. The objective lens with an image sensor and capable of autofocus according to claim 5, characterized in that: The sliding device (5) is fitted with a positioning cylinder (8). One end of the positioning cylinder (8) is installed at the tail of the objective lens tube (1). A notch (81) is provided on the side of the positioning cylinder (8). The connecting bracket (64) passes through the notch (81) and connects to the mounting ring (521).

7. An objective lens with an image sensor and capable of autofocus according to claim 2, 3, or 4, characterized in that: Several objective lenses (2) include objective lens one (21), objective lens two (22), objective lens three (23), objective lens four (24), objective lens five (25), objective lens six (26), objective lens seven (27) and objective lens eight (28); objective lens seven (27) and objective lens eight (28) are glued together.

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