A flicker-proof structure for the rotation of a retinoscope light

Abstract

This invention provides an anti-flicker structure for a retinoscope lamp during rotation, comprising a rotating dial assembly rotatably disposed within a conductive housing; a bulb mounted on the rotating dial assembly, with its first electrode electrically connected to one electrode of a battery; an upper conductive ring and a lower conductive ring respectively disposed on opposite axial sides of the rotating dial assembly and electrically connected to the second electrode of the bulb; and multiple elastic conductive posts evenly distributed circumferentially on the upper and lower conductive rings, one end of each post electrically connected to its corresponding conductive ring, and the other end elastically abutting against the inner wall of the conductive housing; the conductive housing is electrically connected to the other electrode of the battery to form a power supply circuit. This invention employs six or more contact points to ensure uninterrupted contact during rotation, resulting in strong current throughput, high stability, low impedance and minimal loss, preventing lamp flicker and effectively improving lamp illumination.

Description

Technical Field

[0001] This utility model mainly relates to the field of ophthalmic medical device technology, specifically to an anti-flicker structure for the rotation of a retinoscope light. Background Technology

[0002] The retinoscope is a core instrument in ophthalmology and optometry used to objectively measure the refractive state of the human eye (including myopia, hyperopia, and astigmatism). Its principle is to determine the refractive power by illuminating the fundus with a light source and observing the "shadow movement" of the reflected light. Therefore, the brightness stability of the light source, the quality of the light strip shape, and the rotational alignment directly affect the accuracy of the retinoscope results, which places high demands on the conductivity reliability of the retinoscope bulb power supply mechanism.

[0003] Currently, existing retinoscope implementation schemes have the following two main technical defects in their lamp power supply and rotation positioning structures: (a) The method of centering the light bulb is unreliable. The existing solution uses a plastic gasket to center the bulb inside the housing, but this positioning method has the following drawbacks: 1) There is a gap between the inner diameter of the shim and the bulb fixing shaft, which causes the filament image to be skewed and affects the quality of the light strip; 2) A gap exists between the outer diameter of the gasket and the outer casing, which also causes the filament to be skewed; 3) Plastic materials are prone to deformation after being pressed, resulting in uncontrollable installation gaps. After installation, the gaps may be too tight, too loose, or even impossible to install. The product has poor consistency in feel and it is difficult to guarantee the quality stability of mass production.

[0004] (ii) Poor reliability of bulb-powered contact structure In existing designs, one pole of the bulb is powered through a conductive outer casing. The key to this is achieving single-point contact and conductivity solely through the side of a single semi-circular conductive copper wire. This structure has the following inherent drawbacks: 1) Processing errors in the bending radius and length of the conductive copper wire result in inconsistent elasticity among products, leading to differences in conductivity and consequently, inconsistent bulb brightness. 2) The semi-circular conductive copper wire adopts a single-sided contact method, which leads to an imbalance of the overall structure and is prone to cause the filament to deflect, and the rotation center cannot meet the regulatory requirements. 3) The semi-circular conductive copper wire has a single-point contact structure, resulting in poor contact reliability. During rotation, due to inconsistent surface roughness or minor defects in the parts, the contact resistance increases instantaneously, causing a momentary attenuation of power supply and resulting in bulb flickering.

[0005] 4) After long-term use, the single-point contact structure will inevitably wear down the contacts, further deteriorating the contact condition, leading to poor contact, frequent bulb flickering, and seriously affecting the accuracy of retinoscopy and the clinical user experience. Utility Model Content

[0006] 1. The technical problem to be solved by the utility model: This invention provides an anti-flicker structure for the lamp rotation process of a retinoscope, which solves the problems of filament image skew, poor rotational centering, low conductivity reliability, and easy lamp flickering in the existing retinoscope lamp bulb centering and single-point contact conductivity schemes mentioned in the background art.

[0007] 2. Technical Solution: To achieve the above objectives, the technical solution of this utility model is as follows: A flicker-proof structure for a retinoscope light during rotation includes: A rotary dial assembly is rotatably mounted within a conductive housing. A light bulb is mounted on the rotary dial assembly, and the first electrode of the light bulb is electrically connected to one electrode of the battery. The upper conductive ring and the lower conductive ring are respectively disposed on both sides of the axial direction of the rotating dial assembly, and are respectively electrically connected to the second electrode of the bulb; Multiple elastic conductive pillars are evenly distributed circumferentially on the upper conductive ring and the lower conductive ring. One end of each elastic conductive pillar is electrically connected to the corresponding conductive ring, and the other end is elastically abutted against the inner wall of the conductive shell. The conductive outer casing is electrically connected to the other pole of the battery to form a power supply circuit.

[0008] Furthermore, each of the upper conductive ring and the lower conductive ring has three elastic conductive posts evenly distributed on it.

[0009] Furthermore, the rotary dial assembly includes a rotary dial, and the upper conductive ring and the lower conductive ring are respectively threaded onto both sides of the rotary dial.

[0010] Furthermore, the rotary dial is provided with a cylindrical groove, which mates with the front cylindrical surface of the stepped screw. The stepped screw is connected to the up and down toggle button to drive the rotary dial assembly to move axially.

[0011] Furthermore, the elastic conductive post includes a large cylindrical surface and an elastic column. The large cylindrical surface is respectively installed in the mounting hole one of the lower conductive ring and the mounting hole two of the upper conductive ring, and the elastic column elastically abuts against the inner cylindrical surface of the conductive shell.

[0012] Furthermore, the upper conductive ring, lower conductive ring, and elastic conductive post are made of copper and are gold-plated.

[0013] Furthermore, the conductive outer shell is made of copper, and its inner surface is polished.

[0014] Furthermore, the outer periphery of the rotary dial is provided with serrations for manual rotation.

[0015] 3. Beneficial effects: Compared with the prior art, the technical solution provided by this utility model has the following advantages: This utility model has a simplified overall structure, combining multiple parts into one, resulting in a simple, reliable, and lower-cost design.

[0016] This invention employs 6 or more contact points to ensure that the contact is not interrupted during rotation, resulting in strong current flow, high stability, low impedance and low loss, and the bulb will not flicker, effectively improving the bulb's illuminance. This utility model ensures uniform stress distribution on the structure through evenly distributed multiple contact points, preventing the lamp holder from becoming eccentric and ensuring that the rotation center of the lamp is within the regulatory range. The lower and upper conductive rings of this invention are both machined as a single piece with high precision, which allows for better control of smaller gaps, ensuring uniform gaps, higher concentricity, and smoother rotation. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This utility model Figure 2 Main structural sectional view; Figure 3 This is a schematic diagram of the rotary dial assembly structure of this utility model; Figure 4 This is a schematic diagram of the conductive outer shell of this utility model. Figure 5 This is a schematic diagram of the elastic conductive column structure of this utility model; Figure 6 This is a schematic diagram of the conductive ring structure of this utility model.

[0018] Figure label: 1-Rotating dial; 11-Cylindrical groove; 12-Serpentine; 2-Lower conductive ring; 21-Mounting hole one; 3-Upper conductive ring; 31-Mounting hole two; 4-Elastic conductive post; 41-Elastic post; 42-Large cylindrical surface; 5-Up / down toggle button; 6-Step screw; 7-Light bulb; 8-Conductive outer shell; 81-Inner cylindrical surface. Detailed Implementation

[0019] To facilitate understanding of this utility model, a more comprehensive description of the utility model will be given below with reference to the accompanying drawings, which show several embodiments of the utility model. However, the utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of the utility model will be more thorough and complete.

[0020] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "fixing," and "equipped with" 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 mechanical connection or an electrical 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 according to the specific circumstances.

[0021] It should be noted that the structures not described in this utility model do not involve the design points and improvement directions of this utility model and all adopt existing technologies.

[0022] Reference Figure 1-6 This embodiment provides an anti-flicker mechanism during the rotation of a retinoscope light. Its main components include: a rotating dial 1, a lower conductive ring 2, an upper conductive ring 3, an elastic conductive post 4, an up / down toggle button 5, a stepped screw 6, a bulb 7, and a conductive housing 8. To meet higher conductivity requirements, the main components are made of the following materials: the rotating dial 1 is made of aluminum alloy; the lower conductive ring 2 is made of copper with a gold-plated surface, providing good conductivity; the upper conductive ring 3 is made of copper with a gold-plated surface, providing good conductivity; the elastic conductive post 4 is made of copper with a gold-plated surface, providing good conductivity; and the conductive housing 8 is made of copper with a polished inner surface.

[0023] This design is an anti-flicker structure for the retinoscope lamp during rotation. The detailed component structure is as follows. Figure 3This is a rotary dial assembly, consisting of a rotary dial 1, a lower conductive ring 2, an upper conductive ring 3, and elastic conductive posts 4. The assembly process involves threading the lower conductive ring 2 and the upper conductive ring 3 onto both sides of the rotary dial 1. Then, the large cylindrical surfaces 42 of the elastic conductive posts 4 are installed into the corresponding mounting holes 21 of the lower conductive ring 2 and 31 of the upper conductive ring 3. There can be six or more elastic conductive posts; if multiple are used, only the corresponding holes on the upper sides of the lower and upper conductive rings 2 and 3 need to be added. The entire rotary dial assembly is then installed inside the conductive housing 8. The elastic posts 41 on the rotary dial assembly can extend and retract vertically, forming a stable and evenly distributed pressure with the cylindrical surfaces 81 inside the conductive housing 8, thus providing good conductivity. Finally, the bulb 7, the up / down toggle button 5, and the step screw 6 are assembled. After assembly, it should be as follows: Figure 2 As shown.

[0024] One pole of the battery directly powers the bulb 7 via its internal core, while the other pole is the conductive outer casing 8 (this part is prior art and not shown in the figure). Current flows out from the conductive outer casing 8, is conducted through the elastic conductive post 4 to the upper conductive ring 3 and the lower conductive ring 2, and then to the other pole of the bulb 7, forming a complete circuit. The battery is positioned in... Figure 2 Inside the handle, one terminal of the battery is connected to the light bulb, while the other terminal, the conductive outer shell 8, transmits power to the conductive ring via the elastic conductive post 4. To address the axial linear motion and circumferential rotational motion between the conductive ring and the conductive outer shell 8, the elastic conductive post 4 utilizes its elastic extension and sliding contact characteristics to ensure that the conductive outer shell 8 can consistently and with low impedance power the light bulb 7 during continuous dynamic motion. This fundamentally solves the drawbacks of the original single-point structure, such as eccentric wear and poor contact.

[0025] The function of this mechanism is divided into two actions. The first is the up-and-down movement, which is mainly achieved by pressing the up-and-down button 5 with your hand, causing the stepped screw 6 to move up and down. The cylindrical surface of the front end of the stepped screw 6 is engaged in the cylindrical groove 11 of the rotating dial 1, thereby driving the entire rotating dial assembly to move up and down. As a result, the bulb 7 on the rotating dial assembly also moves up and down, realizing the divergence and focusing of the strip light. The second is the rotational movement of the entire rotating dial assembly. When the serrations 12 on the surface of the rotating dial 1 are turned, the rotating dial 1 as a whole will rotate on the inner cylindrical surface 81 inside the conductive shell 8, thereby realizing the rotational movement of the bulb 7. Since the strip light is imaged by the filament, when the bulb 7 rotates, the filament image will also rotate along with it.

[0026] The above-described embodiments are merely illustrative of certain implementations of this utility model, and their descriptions are relatively specific and detailed. However, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A flicker-proof structure for a retinoscope lamp during rotation, characterized in that, include: A rotary dial assembly is rotatably mounted inside a conductive housing (8); The bulb (7) is mounted on the rotary dial assembly, and the first electrode of the bulb (7) is electrically connected to one electrode of the battery; The upper conductive ring (3) and the lower conductive ring (2) are respectively disposed on both sides of the axial direction of the rotating dial assembly and are electrically connected to the second electrode of the bulb (7); Multiple elastic conductive pillars (4) are evenly distributed circumferentially on the upper conductive ring (3) and the lower conductive ring (2). One end of each elastic conductive pillar (4) is electrically connected to the corresponding conductive ring, and the other end is elastically abutted against the inner wall of the conductive shell (8). The conductive outer casing (8) is electrically connected to the other pole of the battery to form a power supply circuit.

2. The anti-flicker structure in the rotation of the mirror lamp light according to claim 1, characterized in that, Three elastic conductive posts (4) are evenly distributed on the upper conductive ring (3) and the lower conductive ring (2).

3. The flicker prevention structure in the rotation of the mirror lamp light according to claim 1, characterized in that, The rotary dial assembly includes a rotary dial (1), and the upper conductive ring (3) and the lower conductive ring (2) are respectively threaded onto the axial sides of the rotary dial (1).

4. The anti-flicker structure in the light rotation process of a viewfinder according to claim 3, wherein, The rotary dial (1) is provided with a cylindrical groove (11), which is engaged with the front cylindrical surface of the stepped screw (6). The stepped screw (6) is connected to the up and down toggle button (5) to drive the rotary dial assembly to move axially.

5. The flicker prevention structure in the rotation of the mirror lamp light according to claim 1, wherein, The elastic conductive post (4) includes a large cylindrical surface (42) and an elastic post (41). The large cylindrical surface (42) is installed in the mounting hole 1 (21) of the lower conductive ring (2) and the mounting hole 2 (31) of the upper conductive ring (3). The elastic post (41) elastically abuts against the inner cylindrical surface (81) of the conductive shell (8).

6. The anti-flicker structure during the rotation of the retinoscope light according to claim 1, characterized in that, The upper conductive ring (3), the lower conductive ring (2), and the elastic conductive post (4) are made of copper and are plated with gold.

7. The flicker-free structure for a mirror lamp during rotation according to claim 1, wherein The conductive outer shell (8) is made of copper and has a polished inner surface.

8. The flicker prevention structure in the rotation of the mirror lamp light according to claim 3, characterized in that, The outer periphery of the rotary dial (1) is provided with serrations (12) for manual rotation.

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