Magnifier focusing device

Abstract

The utility model discloses a magnifier focusing device which comprises a focusing wheel assembly, the focusing wheel assembly is of a cylindrical structure, the peripheral side of the focusing wheel assembly is provided with a focusing limiting groove, and the outer side of the focusing wheel assembly is rotatably connected with a focusing knob. The focusing rotary knob is provided with a plurality of limiting screw holes, the limiting screw holes are in threaded connection with limiting screws, the limiting screws penetrate through the focusing rotary knob and enter the focusing limiting groove to be in sliding connection with the focusing wheel assembly, and the number of the limiting screw holes is larger than two. The focusing knob is connected with a stroke ring base assembly, and the inner side of the stroke ring base assembly is fixedly connected with a lens. The focusing wheel assembly is in multi-directional contact through the limiting screw, multi-angle limiting is carried out on the focusing wheel assembly, and the situation that in the using process of the focusing wheel assembly, the optical fiber detection result is affected by loosening caused by the fact that the gap of threads is increased along with the fact that the using time is prolonged is avoided.

Description

Technical Field

[0001] This utility model relates to the technical field of magnifying glasses, and in particular to a focusing device for magnifying glasses. Background Technology

[0002] During the use of optical fibers, the end face of the fiber optic connector needs to be inspected to check its cleanliness, polishing quality, and light transmission performance, in order to determine whether it meets the usage requirements. Since optical fibers are quite thin, it is difficult to see the end face with the naked eye; therefore, a magnifying glass is needed to magnify it.

[0003] During the testing process, it is often necessary to adjust the position between the optical fiber and the magnifying glass, that is, to adjust the focus to accommodate different types of optical fibers. Currently, some optical fiber testing processes use knobs to adjust the distance between the optical fiber and the magnifying glass. However, as the knobs are used for extended periods, the gaps between the threads and the screw-connected parts of the knob become increasingly larger, leading to loosening and affecting the testing results. Utility Model Content

[0004] The purpose of this invention is to provide a magnifying glass focusing device to solve the problem that the gaps between the knobs and the screw-connected parts are getting bigger and loose, which affects the detection.

[0005] To solve the above problems, this utility model provides a magnifying glass focusing device, including a focusing wheel assembly. The focusing wheel assembly has a cylindrical structure, and a focusing limiting groove is provided on the outer periphery of the focusing wheel assembly. A focusing knob is rotatably connected to the outer side of the focusing wheel assembly.

[0006] The focusing knob is provided with at least three limit screw holes, and limit screws are threaded into the limit screw holes. One end of the limit screw passes through the focusing knob and enters the focusing limit groove to slide and connect with the focusing wheel assembly.

[0007] The focus knob is connected to a travel coil base assembly, and the lens is fixedly connected to the inside of the travel coil base assembly.

[0008] Furthermore, the inner side of the end of the focusing knob near the limiting screw hole is provided with an internal thread, and the outer side of one end of the stroke ring base assembly is provided with a base thread. The stroke ring base assembly is threaded to one end of the focusing knob through the base thread, and the other end of the stroke ring base assembly passes through the inside of the focusing wheel assembly.

[0009] Furthermore, the stroke ring base assembly is provided with a stroke ring connecting part at one end near the base thread. The inner side of the stroke ring connecting part is circular, and the outer side of the stroke ring connecting part is square.

[0010] Furthermore, a focusing stroke ring is connected to the outer side of the stroke ring connecting part. Several first screw holes are provided on the outer periphery of the focusing stroke ring. Threaded plugs are threadedly connected to the first screw holes. Plug springs are provided in the first screw holes. One end of the plug spring contacts the threaded plug, and the other end of the plug spring contacts the stroke ring connecting part. Several plug springs contact two adjacent edges on the outer side of the stroke ring connecting part.

[0011] Furthermore, two second screw holes are provided on the outer periphery of the focusing stroke ring; an adjusting screw is threaded into the second screw hole, one end of the adjusting screw contacts the connecting part of the stroke ring, and the two adjusting screws respectively contact the two sides of the focusing stroke ring that are not in contact with the plug spring; the other end of the adjusting screw is the screw handle, which is located outside the focusing stroke ring and is used by the user to hold and rotate the adjusting screw.

[0012] Furthermore, several third screw holes are provided on the surface of the focusing stroke ring opposite to the stroke ring base assembly, and the third screw holes are used to connect with the fixture.

[0013] Furthermore, a rear retaining ring is fixedly connected to the outer side of the focusing wheel assembly at the end furthest from the focusing travel circle. The rear retaining ring is used to fix the assembly to the clamp.

[0014] Furthermore, one end of the focusing wheel assembly is bolted to the lens barrel.

[0015] Furthermore, the other end of the lens is located inside the travel coil connection.

[0016] The beneficial effects of the magnifying glass focusing device provided by this utility model are as follows: Compared with the prior art, due to the design of the focusing wheel assembly, a focusing limiting groove is provided on the outer periphery of the focusing wheel assembly. A focusing knob is rotatably connected to the outer side of the focusing wheel assembly. Furthermore, several limiting screw holes are provided on the focusing knob, and the limiting screws pass through the focusing knob and enter the focusing limiting groove to slide and connect with the focusing wheel assembly. Simultaneously, the number of limiting screw holes is at least three. The focusing knob is connected to a travel ring base assembly. This allows for multi-directional contact and multi-angle limiting of the focusing wheel assembly through the limiting screws, preventing the focusing wheel assembly from loosening due to increased thread clearance over time, which could affect the fiber optic detection results. Attached Figure Description

[0017] Figure 1 This is a first side view schematic diagram of the focusing device for a magnifying glass.

[0018] Figure 2 This is a second side view schematic diagram of the focusing device for a magnifying glass.

[0019] Figure 3 This is a top-view cross-sectional diagram of the focusing device for a magnifying glass.

[0020] Figure 4 This is a side view of the travel ring base assembly;

[0021] Figure 5 This is a side view of the focusing knob;

[0022] Figure 6 This is a side view of the focusing wheel assembly;

[0023] Figure 7 This is a side view of the focusing travel circle.

[0024] Figure 8 This is a front cross-sectional view of the focusing device for a magnifying glass. Detailed Implementation

[0025] To better understand the purpose, structure, and function of this utility model, the following description is in conjunction with the appendix. Figures 1 to 8 The present invention provides a more detailed description of a magnifying glass focusing device.

[0026] like Figures 1 to 8 As shown in the figure, a magnifying glass focusing device according to an embodiment of the present invention includes a focusing wheel assembly 100, which has a cylindrical structure. A focusing limiting groove 110 is provided on the outer periphery of the focusing wheel assembly 100.

[0027] In this invention, a focusing knob 200 is rotatably connected to the outer side of the focusing wheel assembly 100. The focusing knob 200 has several limiting screw holes 210, each threaded with a limiting screw 220. One end of the limiting screw 220 passes through the focusing knob 200 and enters the focusing limiting groove 110. The limiting screw 220 is slidably connected to the focusing wheel assembly 100. Simultaneously, there are at least three limiting screw holes 210. The focusing knob 200 is connected to a travel ring base assembly 300, and a lens 700 is fixedly connected to the inner side of the travel ring base assembly 300.

[0028] The focusing knob 200 has an internal thread on the inner side of one end near the limiting screw hole 210. The focusing knob 200 is connected to a travel ring base assembly 300. The outer side of one end of the travel ring base assembly 300 has a base thread portion 310. The travel ring base assembly 300 is threadedly connected to one end of the focusing knob 200 through the base thread portion 310. The other end of the travel ring base assembly 300 passes through the inside of the focusing wheel assembly 100.

[0029] In use, the focusing knob 200 and the travel coil base assembly 300 are connected by threads. When the focusing knob 200 is rotated, the focusing knob 200 and the travel coil base assembly 300 are displaced along the axis of the travel coil base assembly 300, thereby realizing the back-and-forth movement of the lens 700. Since there is a gap between the internal thread of the focusing knob 200 and the external thread of the base threaded portion 310, and this gap widens with prolonged use, the larger the gap, the greater its impact on the magnifying glass's focusing. However, by designing a limiting screw 220, which is screwed into and passes through a limiting screw hole 210 that contacts the focusing wheel assembly 100, the problem of the gap widening is solved. When the focusing knob 200 rotates, multiple limiting screws 220 slide against the focusing wheel assembly 100, but the size of the gap between the internal thread of the focusing knob 200 and the external thread of the base threaded portion 310 remains unchanged. This solves the problem of the gap widening. Since the focusing limiting groove 110 has two groove walls, when the focusing knob 200 is rotated, the limiting screw 220 will contact one of the two groove walls of the focusing limiting groove 110, causing the focusing knob 200 to push the focusing wheel assembly 100 to move synchronously. The number of limiting screw holes 210 does not exceed two, because with only two or one, it is impossible to limit the movement on the entire circumference.

[0030] The travel ring base assembly 300 also has a travel ring connecting portion 320 near the base threaded portion 310. The travel ring connecting portion 320 has a circular inner side and a square outer side. In some embodiments, the four corners of the square are rounded chamfers. The circular inner design of the travel ring connecting portion 320 is mainly to match the shape of the lens 700, which is cylindrical.

[0031] It should be noted that a focusing stroke ring 400 is connected to the outer side of the stroke ring connecting part 320. Several first screw holes 410 are provided on the outer periphery of the focusing stroke ring 400. Threaded plugs 411 are threadedly connected to the first screw holes 410. Plug springs 412 are provided in the first screw holes 410. One end of the plug spring 412 contacts the threaded plug 411, and the other end of the plug spring 412 contacts the stroke ring connecting part 320. Several plug springs 412 contact two adjacent edges on the outer side of the stroke ring connecting part 320. Two second screw holes 420 are also provided on the outer periphery of the focusing travel ring 400; adjusting screws 421 are threaded into the second screw holes 420, one end of the adjusting screws 421 contacts the travel ring connecting part 320, and the two adjusting screws 421 respectively contact one of the two sides of the focusing travel ring 400 that are not in contact with the plug spring 412; the other end of the adjusting screws 421 is a screw handle part 422, which is located outside the focusing travel ring 400 and is used by the user to hold and rotate the adjusting screws 421. This design allows the lens to move on a plane perpendicular to the travel ring base assembly 300. When movement is required, the adjusting screws 421 are rotated. When the adjusting screws 421 move towards the lens, they will contact one side of the travel ring connecting part 320, and the adjusting screws 421 will push the travel ring connecting part 320 to move. At this time, on the opposite surface of the travel coil connecting part 320 and the adjusting screw 421, the travel coil connecting part 320 contacts the plug spring 412, and the travel coil connecting part 320 continuously compresses the plug spring 412. When the adjusting screw 421 moves away from the lens, the pushing force of the adjusting screw 421 on the travel coil connecting part 320 disappears, and the compressed plug spring 412 pushes the travel coil connecting part 320 to move. The two adjusting screws 421 contact two adjacent edges of the travel coil connecting part 320 respectively, thereby realizing the movement of the travel coil connecting part 320 in two vertical directions, and thus realizing the movement of the lens 700 in two vertical directions.

[0032] The focusing stroke ring 400 has several third screw holes 430 on its surface opposite to the stroke ring base assembly 300. The third screw holes 430 are used for connection with the fixture. When connecting with the fixture, the focusing stroke ring 400 can be fixed by fixing screws in the third screw holes 430.

[0033] A rear retaining ring 500 is fixedly connected to the outer side of the focusing wheel assembly 100 at the end away from the focusing stroke ring 400. The rear retaining ring 500 is used to fix it to the clamp. The rear retaining ring 500 is also provided with screw holes, which can provide screws to fix the retaining ring 500, thereby fixing the focusing wheel assembly 100.

[0034] One end of the focusing wheel assembly 100 is bolted to the lens barrel 600. The other end of the lens 700 is located inside the travel coil connecting part 320.

[0035] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A focusing device for a magnifying glass, characterized in that, It includes a focusing wheel assembly (100), which is a cylindrical structure. A focusing limiting groove (110) is provided on the outer periphery of the focusing wheel assembly (100), and a focusing knob (200) is rotatably connected to the outer side of the focusing wheel assembly (100). The focusing knob (200) is provided with at least three limiting screw holes (210), and the limiting screw holes (210) are threadedly connected to limiting screws (220). One end of the limiting screw (220) passes through the focusing knob (200) and enters the focusing limiting groove (110) to slide and connect with the focusing wheel assembly (100). The focusing knob (200) is connected to a travel coil base assembly (300), and a lens (700) is fixedly connected to the inner side of the travel coil base assembly (300).

2. The magnifying glass focusing device according to claim 1, characterized in that, The focusing knob (200) has an internal thread on the inner side of one end near the limiting screw hole (210), and the travel ring base assembly (300) has a base threaded portion (310) on the outer side of one end. The travel ring base assembly (300) is threaded to one end of the focusing knob (200) through the base threaded portion (310), and the other end of the travel ring base assembly (300) passes through the inside of the focusing wheel assembly (100).

3. The magnifying glass focusing device according to claim 2, characterized in that, The stroke ring base assembly (300) is further provided with a stroke ring connecting part (320) at one end near the base threaded part (310). The inner side of the stroke ring connecting part (320) is circular, and the outer side of the stroke ring connecting part (320) is square.

4. The magnifying glass focusing device according to claim 3, characterized in that, The outer side of the stroke ring connecting part (320) is connected to a focusing stroke ring (400). The outer periphery of the focusing stroke ring (400) is provided with a plurality of first screw holes (410). A threaded plug (411) is threadedly connected in the first screw hole (410). A plug spring (412) is provided in the first screw hole (410). One end of the plug spring (412) is in contact with the threaded plug (411), and the other end of the plug spring (412) is in contact with the stroke ring connecting part (320). A plurality of the plug springs (412) are in contact with two adjacent sides on the outer side of the stroke ring connecting part (320).

5. The magnifying glass focusing device according to claim 4, characterized in that, Two second screw holes (420) are also provided on the outer periphery of the focusing stroke ring (400); an adjusting screw (421) is threadedly connected in the second screw hole (420), one end of the adjusting screw (421) is in contact with the stroke ring connecting part (320), and the two adjusting screws (421) respectively contact the two sides of the focusing stroke ring (400) that are not in contact with the plug spring (412); the other end of the adjusting screw (421) is a screw handle (422), which is located outside the focusing stroke ring (400) and is used by the user to hold and rotate the adjusting screw (421).

6. The magnifying glass focusing device according to claim 5, characterized in that, The focusing stroke ring (400) has a plurality of third screw holes (430) on the surface opposite to the stroke ring base assembly (300), and the third screw holes (430) are used to connect with the fixture.

7. The magnifying glass focusing device according to claim 6, characterized in that, A rear fixing ring (500) is fixedly connected to the outer side of the end of the focusing wheel assembly (100) away from the focusing stroke ring (400), and the rear fixing ring (500) is used to fix it with the clamp.

8. The magnifying glass focusing device according to claim 7, characterized in that, One end of the focusing wheel assembly (100) is bolted to the lens barrel (600).

9. The magnifying glass focusing device according to claim 8, characterized in that, The other end of the lens (700) is located inside the travel coil connector (320).

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