CN-224216931-U - Guide pin

Abstract

The utility model discloses a guide pin, which is used for driving a focusing lens barrel of a focusing mechanism to move through driving of a driving cam so as to realize focusing, wherein the guide pin penetrates through a main lens barrel sleeved outside the focusing lens barrel to be connected with the focusing lens barrel, a straight groove is formed between the guide pin and the main lens barrel, the guide pin comprises a rod part and a head part which are sequentially connected, the rod part is inserted into the straight groove, and the head part is matched with the driving cam. The guide pin of the scheme is better connected with the main lens barrel, the focusing lens barrel and the like.

Inventors

• ZHU ZHENLEI
• HUANG JIABING
• CHU JIANAN
• YING WENJIE

Assignees

• 宁波舜宇红外技术有限公司

Dates

Publication Date

20260508

Application Date

20241113

Claims (6)

1. 1. The guide pin is used for driving the focusing lens barrel to move along the optical axis direction under the action of the driving cam so as to realize the focusing function, and is connected with the focusing lens barrel by penetrating through a main lens barrel sleeved outside the focusing lens barrel, and a straight slot is arranged between the guide pin and the main lens barrel; the guide pin comprises a rod part and a head part which are sequentially connected, the rod part is inserted into the straight groove, and the head part is matched with the driving cam.
2. 2. The guide pin of claim 1, wherein a bottom of the stem is inserted in the focusing barrel.
3. 3. The guide pin of any of claims 1-2, wherein the head has a diameter that is less than a diameter of the shaft.
4. 4. The guide pin of any of claims 1-2, wherein the stem has a polygonal cross-section.
5. 5. The guide pin of claim 4, wherein the polygonal cross-section is a regular hexagonal cross-section, a regular quadrilateral cross-section, or a regular pentagonal cross-section.
6. 6. The guide pin of any of claims 1-2, wherein the guide pin is integrally formed.

Description

Guide pin The application is a divisional application of China patent application with the name of 'focusing mechanism' and applied for 2024, 11 and 13 days, and the application number is 202422770776.3. Technical Field The utility model relates to the technical field of optical lenses, in particular to a guide pin. Background In the current optical lens, in order to achieve the imaging clarity of targets with different distances, a focusing function is generally provided. Wherein the focusing function is realized by axial movement of the focusing barrel relative to the main barrel. In order to drive the focus barrel to move, a driving mechanism including a guide pin provided on the main barrel and a driving cam engaged with the guide pin is commonly used in the related art. The guide pin moves along with the focusing lens barrel and drives the focusing lens barrel to move along the optical axis direction under the action of the driving cam, so that the focusing function is realized. However, in the conventional focusing mechanism, since there is a gap between the guide pin and the driving cam, a focusing lag phenomenon often occurs during focusing, particularly when the focusing direction is reversed, which affects focusing accuracy and speed. And when the lens is impacted by external force, the focusing lens barrel can shake due to the existence of the gap, so that the imaging quality is further affected. At present, the connection between the guide pin and the main lens barrel, the focusing lens barrel and the like has certain defects. Therefore, it is desirable to provide a guide pin that is impact resistant, simple in structure, easy to assemble, and low in cost, while being better connected to the main barrel, the focus barrel, and the like. Disclosure of utility model In order to solve at least one or more of the technical problems mentioned above, the present utility model proposes a guide pin. In a first aspect, the utility model provides a guide pin, which is used for driving a focusing lens barrel to move along the optical axis direction under the action of a driving cam so as to realize a focusing function, wherein the guide pin penetrates a main lens barrel sleeved outside the focusing lens barrel to be connected with the focusing lens barrel, a straight groove is formed between the guide pin and the main lens barrel, the guide pin comprises a rod part and a head part which are sequentially connected, the rod part is inserted into the straight groove, and the head part is matched with the driving cam. In one embodiment, the bottom of the rod is inserted in the focusing barrel. In one embodiment, the diameter of the head is smaller than the diameter of the stem. In one embodiment, the stem has a polygonal cross section. In one embodiment, the polygonal cross-section is a regular hexagonal cross-section, a regular quadrilateral cross-section, or a regular pentagonal cross-section. In one embodiment, the guide pin is integrally formed. In a second aspect, the utility model further provides a focusing mechanism, which comprises a driving mechanism and a focusing assembly, wherein the focusing assembly comprises a focusing lens barrel, the driving mechanism comprises a guide pin arranged on the focusing lens barrel and a driving cam matched with the guide pin, and at least one repulsive force piece is arranged on the axial side of the guide pin, wherein the repulsive force piece provides an inner repulsive force or an outer repulsive force pointing to a port of the focusing lens barrel so as to eliminate a gap between the guide pin and the driving cam. In one embodiment, the force-receiving portion of the repulsive force member abuts against the focusing assembly. In one embodiment, the guide pin is disposed at one side of the focusing barrel. In one embodiment, the driving cam is disposed outside the focusing barrel. In one embodiment, the repulsive force member comprises an elastic member or a magnetic force assembly. In one embodiment, the elastic member is a spring and the magnetic assembly includes two magnets that repel or attract each other. In one embodiment, the number of elastic members or magnetic force components is one or more. In one embodiment, the repulsive force piece is of a nested structure and comprises a guide rod, one end of the guide rod is connected with the focusing lens barrel, the elastic piece is sleeved outside or embedded in the guide rod, or one end of the guide rod is connected with the focusing lens barrel, and one of two magnets included in the magnetic force component is sleeved outside or embedded in the guide rod, and the other of the two magnets included in the magnetic force component is arranged on a structure opposite to the focusing lens barrel. In one embodiment, the repulsive force direction of the repulsive force member is coaxial with the direction of the external force impact applied to the focusing lens barrel. In one embodiment, the repulsive force me