Focusing mechanism capable of eliminating gap
By using a short telescopic pin to apply preload to the second lens holder in the focusing mechanism, the gap between the guide pin and the handwheel is eliminated, the gap between the guide pin and the focusing groove is solved, and the lens's stable focusing and vibration resistance are improved, ensuring image clarity and impact resistance.
Patent Information
- Application Number
- CN202520249301.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-17
- Publication Date
- 2025-12-02
- Estimated Expiration
- 2035-02-17
AI Technical Summary
In traditional focusing mechanisms, there is a gap between the guide pin and the focusing groove, which leads to a decrease in image quality during lens focusing, blurring of images when the product is subjected to impact and vibration, and severe lens displacement.
A short telescopic pin is used to apply preload to the second lens bracket, eliminating the gap between the guide pin and the handwheel. The telescopic pin can extend and retract within a certain range to adapt to the adjustment of the handwheel, thus achieving the guiding function of the guide and ensuring the stability and vibration resistance of the focusing process.
It improves image quality, enhances vibration and shock resistance, ensures image clarity, has a simple structure, is easy to install and maintain, and has a low cost.
Smart Images
Figure CN223624465U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of infrared lens technology, specifically relating to a focusing mechanism that can eliminate gaps. Background Technology
[0002] Traditional focusing mechanisms use grinding and fitting to achieve a tight fit between the guide pin and the focusing groove. However, due to manufacturing errors, the focusing groove has uneven widths throughout its length. Furthermore, optical lenses are exposed to varying temperature environments during use. Therefore, a certain gap is left between the guide pin and the focusing groove to ensure smooth operation of the focusing mechanism.
[0003] Because there is a gap between the guide pin and the focusing groove, the following disadvantages occur during lens focusing: during focusing, the lens cannot move along the predetermined trajectory, causing displacement of the lens's optical image plane, resulting in decreased image quality, and in severe cases, blurry images; when the product is subjected to impact and vibration, the lens will shift due to the gap, leading to blurry images; based on this, this utility model designs a focusing mechanism that can eliminate the gap to solve the above problems. Utility Model Content
[0004] To overcome the problem that a gap exists between the guide pin and the focusing groove, which leads to decreased image quality during focusing and, in severe cases, blurred images; and that the lens may shift due to the gap when the product is subjected to impact or vibration, resulting in blurred images, this utility model provides a focusing mechanism that can eliminate the gap. The short telescopic pin has a certain preload on the second lens holder, indirectly eliminating the gap between the guide pin and the handwheel, avoiding lens displacement and blurred images caused by the gap, thereby improving image quality. During focusing, the guide pin can move along the trajectory of the focusing groove, ensuring the stability of the lens's optical image plane and further improving image quality. The elimination of the gap reduces the possibility of the second lens shifting when the product is subjected to impact or vibration, enhancing the product's vibration resistance, increasing its impact resistance, and ensuring image clarity. The overall structure is simple, easy to install and maintain, and has a low cost.
[0005] To achieve the above objectives, this utility model is implemented through the following technical solution: A focusing mechanism capable of eliminating gaps mainly includes a first lens retaining ring, a second lens retaining ring, a second lens bracket, a guide pin, a handwheel, a rear fixing seat, a short telescopic pin, a first lens, a second lens, and a main lens barrel. The rear fixing seat is installed at the end of the main lens barrel. The second lens bracket is installed inside the main lens barrel via the short telescopic pin. The first lens is installed inside the main lens barrel. The first lens retaining ring, used to restrict the axial movement of the first lens, is installed inside the main lens barrel and located at the front end of the first lens. The second lens is installed inside the second lens bracket. The second lens retaining ring, used to restrict the axial movement of the second lens, is installed inside the second lens bracket and located at the front end of the second lens. A mounting groove is provided at the top of the main lens barrel. A mounting hole is provided on the side wall of the second lens bracket. The guide pin is installed in the mounting groove and its bottom end is connected to the mounting hole. A focusing groove is provided on the inner wall of the handwheel. The top end of the guide pin is connected to the focusing groove. The handwheel is rotatably mounted on the outer wall of the main lens barrel and the rear fixing seat via the guide pin.
[0006] The aforementioned short telescopic pins are installed in three sets.
[0007] The short telescopic pin has a total length of 13mm and a telescopic range of 0 to 1.5mm.
[0008] The handwheel has anti-slip grooves on its outer wall.
[0009] The guide pin engages with the handwheel focusing groove, with a clearance of ≤0.02mm.
[0010] The beneficial effects of this utility model are:
[0011] The short telescopic pin has a certain preload on the second lens holder, which indirectly eliminates the gap between the guide pin and the handwheel, avoiding lens displacement and image blurring caused by the gap, thereby improving image quality. During focusing, the guide pin can move along the trajectory of the focus guide groove, ensuring the stability of the lens's optical image plane and further improving image quality. The elimination of the gap reduces the possibility of displacement of the second lens when the product is subjected to impact and vibration, enhances the product's vibration resistance, increases its impact resistance, and ensures image clarity. The overall structure is simple, easy to install and maintain, and has a low cost. Attached Figure Description
[0012] Figure 1 This is a three-dimensional schematic diagram of the present invention.
[0013] Figure 2 This is another three-dimensional schematic diagram of this utility model.
[0014] Figure 3 This is a schematic diagram of the handwheel structure.
[0015] Figure 4 This is the right view of this utility model.
[0016] Figure 5 yes Figure 4 A sectional view of line A-A.
[0017] Figure 6 yes Figure 4 Sectional view of line B-B.
[0018] Figure 7 This is a three-dimensional cross-sectional view of a short telescopic pin.
[0019] Figure 8 This is a schematic diagram of the second lens support structure. Detailed Implementation
[0020] To make the objectives, technical solutions, and beneficial effects of this utility model clearer, the preferred embodiments of this utility model will be described in detail below with reference to the accompanying drawings, so as to facilitate the understanding of those skilled in the art.
[0021] This utility model discloses a focusing mechanism capable of eliminating gaps. The focusing mechanism mainly includes a first lens retaining ring 1, a second lens retaining ring 2, a second lens support 3, a guide pin 4, a handwheel 5, a rear fixing seat 6, a short telescopic pin 7, a first lens 8, a second lens 9, and a main lens barrel 10. The rear fixing seat 6 is installed at the end of the main lens barrel 10. The second lens support 3 is installed inside the main lens barrel 10 via the short telescopic pin 7. The first lens 8 is installed inside the main lens barrel 10. The first lens retaining ring 1, used to restrict the axial movement of the first lens 8, is installed inside the main lens barrel 10. The main lens barrel 10 is located at the front end of the first lens 8. The second lens 9 is installed inside the second lens bracket 3. The second lens retaining ring 2, which is used to limit the axial movement of the second lens 9, is installed inside the second lens bracket 3 and located at the front end of the second lens 9. The top of the main lens barrel 10 is provided with a mounting groove 101. The side wall of the second lens bracket 3 is provided with a mounting hole 31. The guide pin 4 is installed in the mounting groove 101 and its bottom end is connected to the mounting hole 31. The inner wall of the handwheel 5 is provided with a focusing groove 51. The top end of the guide pin 4 is connected to the focusing groove 51. The handwheel 5 is rotatably mounted on the outer wall of the main lens barrel 10 and the rear fixed seat 6 through the guide pin 4.
[0022] The operator rotates handwheel 5, which drives guide pin 4 to move. The movement of guide pin 4 is transmitted to the second lens bracket 3 via short telescopic pin 7. Because short telescopic pin 7 has a telescopic range of 0-1.5mm, it can adapt to the movement changes of the second lens bracket 3 within a certain range during the transmission of movement. The movement of the second lens bracket 3 then drives the internally installed second lens 9 to perform axial fine adjustment. The first lens 8, due to the axial movement being restricted by the first lens retaining ring 1, remains relatively stable during the overall focusing process. The second lens 9, driven by the second lens bracket 3, performs the focusing operation, thereby realizing the overall focusing function. During the focusing process, short telescopic pin 7 plays a supporting and guiding role, and at the same time has a certain preload on the second lens bracket 3. Short telescopic pin 7 can extend and retract within a certain range to adapt to the gap changes between guide pin 4 and focusing groove 51. When there is a gap between guide pin 4 and focusing groove 51, short telescopic pin 7 will automatically extend and retract to fill the gap, thereby ensuring the stability of the second lens bracket 3. The smooth movement and elimination of gaps reduce the possibility of displacement of the second lens 9 when the product is subjected to impact and vibration, enhance the product's vibration resistance, increase its impact resistance, ensure the clarity of the image, and the overall structure is simple, easy to install and maintain, and has a low cost.
[0023] The short telescopic pins 7 are installed in three sets; the three sets of short telescopic pins 7 can distribute the stress more evenly and prevent the second lens support 3 from shaking or shifting during focusing.
[0024] like Figure 7 As shown, the short telescopic pin 7 has a total length of 13mm and a telescopic range of 0 to 1.5mm, which allows the second lens bracket 3 to move within a certain range, enabling flexible adjustment of focus.
[0025] like Figure 2 , Figure 3 As shown, the handwheel 5 has an anti-slip groove 52 on its outer wall; this helps the user to grip the handwheel 5 better when operating it and prevents the hand from slipping when turning the handwheel 5 to adjust the focus.
[0026] like Figure 5 As shown, the guide pin 4 and the focusing groove 51 of the handwheel 5 are engaged with a gap of ≤0.02mm; this helps to improve the focusing accuracy. The smaller gap allows for more precise relative movement between the guide pin 4 and the focusing groove 51 during focusing, thus enabling more accurate adjustment of the focal length.
[0027] Work process:
[0028] When the operator rotates handwheel 5, since handwheel 5 is connected to the second lens bracket 3 via guide pin 4, with its top end in the focusing groove 51 and its bottom end connected to the mounting hole 31 of the second lens bracket 3, the rotation of handwheel 5 drives the guide pin 4 to move. The movement of the guide pin 4 is transmitted to the second lens bracket 3 through short telescopic pin 7. Because short telescopic pin 7 has a telescopic range of 0-1.5mm, it can adapt to the movement changes of the second lens bracket 3 within a certain range during the transmission of movement. The movement of the second lens bracket 3 then drives the internally installed second lens 9 to perform axial fine adjustment. The first lens 8, due to the axial movement being restricted by the first lens retaining ring 1, remains relatively stable during the overall focusing process. The second lens 9 performs focusing operation under the drive of the second lens bracket 3, thereby realizing the overall focusing function. During the focusing process, short telescopic pin 7 plays a supporting and guiding role, and at the same time has a certain preload on the second lens bracket 3. Short telescopic pin 7 can extend and retract within a certain range to adapt to the gap changes between the guide pin 4 and the focusing groove 51. When there is a gap between the focusing groove 51 and the second lens support 3, the short telescopic pin 7 will automatically extend and retract to fill the gap, thereby ensuring the smooth movement of the second lens support 3. The elimination of the gap reduces the possibility of displacement of the second lens 9 when the product is subjected to impact and vibration, enhances the product's vibration resistance, increases its impact resistance, ensures the clarity of the image, and has a simple overall structure that is easy to install and maintain, with low cost.
[0029] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although the utility model has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the scope defined by the claims of this utility model.
Claims
1. A focusing mechanism capable of eliminating gaps, characterized in that: The aforementioned focusing mechanism for eliminating gaps includes a first lens retaining ring (1), a second lens retaining ring (2), a second lens support (3), a guide pin (4), a handwheel (5), a rear fixing seat (6), a short telescopic pin (7), a first lens (8), a second lens (9), and a main lens barrel (10). The rear fixing seat (6) is installed at the end of the main lens barrel (10). The second lens support (3) is installed inside the main lens barrel (10) via the short telescopic pin (7). The first lens (8) is installed inside the main lens barrel (10). The first lens retaining ring (1), used to restrict the axial movement of the first lens (8), is installed inside the main lens barrel (10) and located at the front end of the first lens (8). The second lens (9) is installed inside the second lens bracket (3). The second lens retaining ring (2) used to restrict the axial movement of the second lens (9) is installed inside the second lens bracket (3) and located at the front end of the second lens (9). The top of the main lens barrel (10) is provided with a mounting groove (101). The side wall of the second lens bracket (3) is provided with mounting holes (31). The guide pin (4) is installed in the mounting groove (101) and its bottom end is connected to the mounting hole (31). The inner wall of the handwheel (5) is provided with a focusing groove (51). The top end of the guide pin (4) is connected to the focusing groove (51). The handwheel (5) can be rotatably installed on the outer wall of the main lens barrel (10) and the rear fixing seat (6) through the guide pin (4).
2. A focusing mechanism capable of eliminating gaps as described in claim 1, characterized in that: The aforementioned short telescopic pin (7) is installed in three sets.
3. A focusing mechanism capable of eliminating gaps as described in claim 2, characterized in that: The short telescopic pin (7) has a total length of 13mm and a telescopic range of 0 to 1.5mm.
4. A focusing mechanism capable of eliminating gaps as described in claim 1 or 2, characterized in that: The handwheel (5) has an anti-slip groove (52) on its outer wall.
5. A focusing mechanism capable of eliminating gaps as described in claim 1 or 2, characterized in that: The guide pin (4) is fitted with the focus adjustment groove (51) of the handwheel (5), and the fitting gap is ≤0.02mm.