Guide rail type focusing device

Abstract

The utility model discloses a guide rail type focusing device, and relates to the technical field of guide rail type focusing. The guide rail type focusing device comprises a transmission gear, a fixing support, an image sensor and a stepping motor. The transmission gear is in sliding connection with the fixing support, the image sensor is arranged on the fixing support, a spring is further arranged between the image sensor and the fixing support, a driving gear is arranged at the output end of the stepping motor, and the driving gear is connected with the transmission gear in a meshed mode. According to the guide rail type focusing device provided by the utility model, the image sensor is arranged on the fixed bracket, and the fixed bracket performs lifting motion so as to achieve the purpose of focusing. In addition, a guide rail mode formed by the transmission gear and the fixing support enables a guide rail inclined groove and an inclined bone position to be in surface-to-surface contact so as to achieve the purposes of stability and zero clearance, assembly tolerance is reduced, focusing precision is improved, high-speed snapshot is achieved, meanwhile, the whole image is clear and balanced, and the problem that one side of the image is clear and the other side of the image is blurred is solved.

Description

Technical Field

[0001] This utility model relates to the field of guide rail focusing technology, and in particular to a guide rail focusing device. Background Technology

[0002] Currently, most ABF focusing devices on bullet cameras use a screw-driven mechanism to rotate the image sensor. This method generates significant friction and is prone to freezing in low-temperature environments (-40℃). Furthermore, a gap needs to be maintained between the threads to prevent them from rotating properly. This makes it difficult to keep the image sensor and lens in a parallel state, severely impacting image quality.

[0003] The ABF (Alignment-Based Folio) focusing device is used to refocus when the lens and image sensor are out of focus due to various tolerances. Currently, this device is designed to solve the problem of focusing jamming in low-temperature environments of -40°C. Furthermore, due to its rail structure, it allows for smooth movement during focusing and maximizes the parallelism between the lens and image sensor, preventing tilting that could cause uneven image clarity and negatively impact image quality. Utility Model Content

[0004] To address the aforementioned technical issues, this invention proposes a rail-type focusing device that ensures smooth operation in low-temperature environments down to -40°C, while maintaining the lens and image sensor in a parallel state to enhance image quality during snapshot capture.

[0005] The objective of this utility model is achieved through the following technical solution:

[0006] A guide rail type focusing device is provided, including a transmission gear, a fixed bracket, an image sensor and a stepper motor; the transmission gear is slidably connected to the fixed bracket, the image sensor is mounted on the fixed bracket, a spring is also provided between the image sensor and the fixed bracket, and a drive gear is provided at the output end of the stepper motor, which meshes with the transmission gear.

[0007] Preferably, the stepper motor can drive the transmission gear to rotate.

[0008] Furthermore, the transmission gear is provided with a guide rail groove, and the fixed bracket is provided with a slanted bone position, which is slidably connected to the guide rail groove.

[0009] The guide rail groove and the inclined rib form the guide rail motion structure. The stepper motor serves as the power source for the operation of the guide rail motion structure.

[0010] Furthermore, the guide rail type focusing device also includes an electric filter, which is disposed between the spring and the image sensor.

[0011] The motorized filter is an optical device used to select the desired radiation band. The fixed bracket acts as a lifting platform, which can drive the motorized filter and image sensor to move up and down.

[0012] Furthermore, the guide rail type focusing device also includes an optical coupler sensor, which is located on the side of the image sensor away from the motorized filter.

[0013] The optocoupler sensor serves a positioning function and emits a light-sensing line. When the transmission gear rotates, the oblique bone on the fixed bracket will rotate to the sensing line and trigger an alarm. At this time, the trigger point can be used for positioning, and subsequent operation will use this point as the reference point.

[0014] Furthermore, the fixed bracket is provided with a positioning post, and the spring is sleeved on the outside of the positioning post.

[0015] The spring continuously applies a downward force to the fixed bracket, which causes the oblique bone to slide within the guide rail groove, forming a sliding guide lifting mechanism.

[0016] Furthermore, there are multiple positioning posts, each evenly arranged on the fixed bracket.

[0017] Preferably, there are three positioning posts.

[0018] In this system, the transmission gear meshes with the drive gear of the stepper motor. When the stepper motor is running, the transmission gear rotates, while the fixed bracket is restricted from rotating by the positioning column and can only move up and down. At this time, the rotation of the guide rail groove of the transmission gear will cause the inclined bone of the fixed bracket to slide up or down along the slope in the guide rail groove, forming a lifting and lowering motion mode.

[0019] Furthermore, the guide rail type focusing device also includes a first screw, and the spring and the fixed bracket are fixed by the first screw.

[0020] Furthermore, the guide rail type focusing device also includes a second screw, through which the image sensor is fixed to the motorized filter.

[0021] Furthermore, the guide rail type focusing device also includes a third screw, through which the optical coupler sensor is fixed to the image sensor.

[0022] Furthermore, the guide rail type focusing device also includes a front housing, and the transmission gear is disposed inside the front housing.

[0023] Preferably, the transmission gear abuts against the bottom surface of the inner wall of the front housing.

[0024] The front shell serves to secure other components and act as the overall frame.

[0025] This utility model provides a guide rail type focusing device, which has the following advantages compared with the prior art:

[0026] By mounting the image sensor on a fixed bracket, which then moves up and down to achieve focusing, the image sensor is focused. Furthermore, the guide rail system formed by the transmission gears and the fixed bracket allows for surface-to-surface contact between the guide rail groove and the rib, achieving smooth operation and zero clearance. This reduces assembly tolerances, increases focusing accuracy, enables high-speed image capture, and ensures a clear and balanced image, minimizing uneven sharpness. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is an exploded view of the guide rail type focusing device according to an embodiment of the present utility model;

[0029] Figure 2 This is a cross-sectional schematic diagram of the guide rail type focusing device according to an embodiment of the present utility model;

[0030] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0031] Figure 4 This is a schematic diagram of the structure of the fixing bracket in an embodiment of the present utility model;

[0032] Figure 5 This is a schematic diagram of the transmission gear in an embodiment of the present invention;

[0033] Figure 6 This is a schematic diagram of the assembly of the fixed bracket and the transmission gear in an embodiment of the present utility model;

[0034] Figure 7 This is an assembly diagram of the guide rail type focusing device according to an embodiment of the present utility model;

[0035] Figure 8 This is a schematic diagram of the operation of the transmission gear during rotation according to an embodiment of the present invention;

[0036] Figure 9 This is a schematic diagram of the operation of the fixed bracket during its ascent, according to an embodiment of this utility model.

[0037] Explanation of the markings in the image:

[0038] 1-Transmission gear; 2-Fixed bracket; 3-Image sensor; 4-Stepper motor; 5-Spring; 6-Guide rail groove; 7-Slanted rib; 8-First screw; 9-Positioning post; 10-Electrically operated filter; 11-Second screw; 12-Optical coupler sensor; 13-Third screw; 14-Front shell. Detailed Implementation

[0039] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0040] It should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0041] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0042] Example

[0043] Please see Figures 1-9The guide rail type focusing device shown includes a transmission gear 1, a fixed bracket 2, an image sensor 3, and a stepper motor 4. The transmission gear 1 is slidably connected to the fixed bracket 2. The image sensor 3 is mounted on the fixed bracket 2, and a spring 5 is provided between the image sensor 3 and the fixed bracket 2. The output end of the stepper motor 4 has a drive gear, which meshes with the transmission gear 1. The stepper motor 4 can drive the transmission gear 1 to rotate. The transmission gear 1 has a guide rail groove 6, and the fixed bracket 2 has a slanted rib 7, which is slidably connected within the guide rail groove 6. The guide rail groove 6 and the slanted rib 7 form a guide rail motion structure. The stepper motor 4 serves as the power source for the operation of the guide rail motion structure. The guide rail type focusing device also includes a first screw 8, and the spring 5 is fixed to the fixed bracket 2 by the first screw 8.

[0044] The fixed bracket 2 is equipped with positioning posts 9, and the spring 5 is sleeved on the positioning posts 9. The spring 5 continuously applies a downward force to the fixed bracket 2. There are multiple positioning posts 9, evenly distributed on the fixed bracket 2. In this embodiment, there are three positioning posts 9. The transmission gear 1 meshes with the drive gear of the stepper motor 4. When the stepper motor 4 runs, the transmission gear 1 rotates, while the fixed bracket 2 is restricted from rotation by the positioning posts 9, allowing only up-and-down movement. At this time, the rotation of the guide rail groove 6 of the transmission gear 1 causes the inclined bone position 7 of the fixed bracket 2 to slide up or down along the slope in the guide rail groove 6, forming a lifting and lowering motion mode.

[0045] The guide rail type focusing device also includes an electric filter 10, which is disposed between the spring 5 and the image sensor 3. The guide rail type focusing device also includes a second screw 11, through which the image sensor 3 is fixed to the electric filter 10. The fixed bracket 2 serves as a lifting platform, capable of driving the electric filter 10 and the image sensor 3 to move up and down. The guide rail type focusing device also includes an optical coupler sensor 12, disposed on the side of the image sensor 3 away from the electric filter 10. The guide rail type focusing device also includes a third screw 13, through which the optical coupler sensor 12 is fixed to the image sensor 3. The optical coupler sensor 12 serves a positioning function, emitting a light-sensing line. When the transmission gear 1 rotates, the oblique rib 7 on the fixed bracket 2 rotates to this sensing line, triggering an alarm. At this point, the trigger point can be used for positioning, and subsequent operation uses this point as the reference point. The guide rail type focusing device also includes a front housing 14, within which the transmission gear 1 is disposed. In this embodiment, the transmission gear 1 abuts against the bottom surface of the inner wall of the front housing 14. The front housing 14 serves to fix other components and acts as an overall frame.

[0046] When the guide rail type focusing device is running, the gear transmission between the stepper motor 4 and the transmission gear 1 is used. When the transmission gear 1 rotates, the spring 5 sleeved on the three positioning columns 9 applies a downward force to the fixed bracket 2, so that the oblique bone position 7 on the fixed bracket 2 runs smoothly against the slope direction in the guide rail groove 6 of the transmission gear 1, so as to achieve the sliding guide lifting and lowering operation mode. When the fixed bracket 2 is raised and lowered, it drives the image sensor 3 to focus.

[0047] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A rail-type focusing device, characterized in that, It includes a transmission gear, a fixed bracket, an image sensor, and a stepper motor; the transmission gear is slidably connected to the fixed bracket, the image sensor is mounted on the fixed bracket, a spring is provided between the image sensor and the fixed bracket, and a drive gear is provided at the output end of the stepper motor, which meshes with the transmission gear.

2. The guide rail type focusing device as described in claim 1, characterized in that, The transmission gear is provided with a guide rail groove, and the fixed bracket is provided with a slanted bone position, which is slidably connected to the guide rail groove.

3. The guide rail type focusing device as described in claim 2, characterized in that, It also includes an electrically driven filter, which is disposed between the spring and the image sensor.

4. The guide rail type focusing device as described in claim 3, characterized in that, It also includes an optical coupler sensor, which is located on the side of the image sensor away from the motorized filter.

5. The guide rail type focusing device as described in claim 4, characterized in that, The fixed bracket is provided with a positioning post, and the spring is sleeved on the outside of the positioning post.

6. The guide rail type focusing device as described in claim 5, characterized in that, The positioning posts are multiple, and each positioning post is evenly arranged on the fixed bracket.

7. The guide rail type focusing device as described in claim 6, characterized in that, It also includes a first screw, which secures the spring and the fixing bracket together.

8. The guide rail type focusing device as described in claim 7, characterized in that, It also includes a second screw, by which the image sensor is fixed to the motorized filter.

9. The guide rail type focusing device as described in claim 8, characterized in that, It also includes a third screw, through which the optocoupler sensor is fixed to the image sensor.

10. The guide rail type focusing device as described in claim 9, characterized in that, It also includes a front housing, in which the transmission gear is disposed.

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