Visual chart projector

Abstract

The utility model relates to a visual chart projector which comprises a projector base, the projector base is provided with a base ball head sleeve used for placing a ball head of a projector body, the base ball head sleeve is connected with a ball head connector, the ball head connector is provided with a step, a ball head pressing gasket is placed on the step, and the ball head pressing gasket is connected with a ball head of the projector body. A base screw cap which is in threaded connection with the ball joint is arranged on the ball pressing gasket; the projector body comprises an upper cover and a lower shell, an optical assembly and a PCB electronic assembly are arranged in the lower shell, a front cover is arranged at the front end of the lower shell, and a metal plate rack is arranged at the rear end of the lower shell. According to the novel structure, the projector body can be rotated by unscrewing the base screw cap, so that the up, down, left and right positions of the projector body can be adjusted, and convenience is brought to actual users. Meanwhile, by opening the upper cover, the optical assembly and the PCB electronic assembly can be adjusted and maintained.

Description

Technical Field

[0001] The utility model relates to the technical field of vision detection equipment, in particular to a vision chart projector. Background Art

[0002] The eye chart projector is a medical auxiliary device with a built-in eye chart for testing human vision. It is a vision testing device that makes various eye charts with different testing functions into slides, so that optometrists can control and select the required eye chart to be projected onto a dedicated screen through a remote control during optometry testing. Eye chart projectors are common in physical examinations. They are needed to test vision for work, further education, and military service. They are the basis for judging whether the eyeball has refractive errors or color blindness. Optometrists roughly judge the vision based on the feedback from the person being tested to achieve the purpose of testing human vision.

[0003] Publication (announcement) number: CN220186425U, patent title: A lifting and adjusting device for a vision chart projector, which discloses "… through the mutual cooperation of a hydraulic rod, a fixed column, an extension plate, a top plate and a holder, the vision projector can be driven to be stably lifted and lowered. In the process of the hydraulic rod driving the vision projector to lift, the vision projector slides on the fixed column through the extension plate to ensure its stability. The top plate can limit the height of the vision projector, and the holder can stably support the vision projector, thereby achieving the purpose of facilitating the lifting and lowering of the vision projector and facilitating the use of different heights, avoiding the problem that most vision chart projectors are fixed structures and cannot adjust their height, resulting in certain limitations."

[0004] Although this structure can adjust the height of the vision chart projector, it cannot adjust its left and right position, which brings inconvenience to actual users. Summary of the invention

[0005] The purpose of the utility model is to provide a vision chart projector to solve the problems raised in the above background technology.

[0006] In order to solve the above technical problems, the utility model is implemented through the following technical measures: a vision chart projector, including a projector base, wherein the projector base is provided with a base ball head sleeve for placing the ball head of the projector body, a ball head joint is connected to the base ball head sleeve, a step is provided on the ball head joint, a pressure ball head gasket is placed on the step, and a base screw cover threadedly connected to the ball head joint is provided on the pressure ball head gasket; the projector body includes an upper cover and a lower shell, optical components and PCB electronic components are arranged in the lower shell, a front cover is provided at the front end of the lower shell, and a sheet metal frame is provided at the rear end of the lower shell.

[0007] Compared with the prior art, the utility model has the advantages that: this new structure can rotate the projector body by loosening the base cover, so that the up, down, left, and right positions of the projector body can be adjusted, which brings convenience to actual users. At the same time, by opening the upper cover, the optical components and PCB electronic components can be adjusted and maintained.

[0008] As an improvement of the utility model, the front end of the upper cover is snap-fitted with the front cover, and the rear end of the upper cover is screw-fitted with the sheet metal frame. The purpose of selecting this design is: when in use, first snap-fit ​​the front end of the upper cover with the front cover, then press the rear end of the upper cover and screw-fit it with the sheet metal frame through bolts.

[0009] As an improvement of the utility model, the portion where the ball head pressing gasket contacts the ball head is a spherical surface. The purpose of selecting this design is to increase the contact area between the two and enhance the pressing force.

[0010] As an improvement of the utility model, the overall thickness of the ball head gasket is C, and the step depth of the ball joint is B, wherein C is greater than B. The purpose of selecting this design is that the base screw cap drives the ball head gasket to press down by screwing with the ball joint thread, and when C is greater than B, the pressure can be fully applied to the ball head, so that it is firmly fixed.

[0011] As an improvement of the utility model, the inner diameter of the ball joint is D, and the diameter of the ball head is E, wherein D is equal to E. The purpose of selecting this design is to position the ball head with the ball joint to prevent the ball from moving due to gaps. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0013] In the attached picture:

[0014] Figure 1 It is a three-dimensional exploded view of the vision chart projector described in the utility model.

[0015] Figure 2 This is a front view of the vision chart projector described in the utility model.

[0016] Figure 3 It is an enlarged view of the A part described in the utility model.

[0017] Figure 4 It is a cross-sectional view of the ball pressure head gasket described in the utility model.

[0018] Figure 5 It is a cross-sectional view of the ball joint described in the utility model.

[0019] Explanation of the accompanying drawings: 1. Projector base; 2. Projector body; 3. Ball head; 4. Base ball head cover; 5. Ball head joint; 6. Press ball head gasket; 7. Base screw cover; 8. Upper cover; 9. Lower shell; 10. Optical component; 11. PCB electronic component; 12. Front cover; 13. Sheet metal frame; 14. Spherical surface; 15. External thread. DETAILED DESCRIPTION

[0020] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0021] Example 1

[0022] Please refer to Figure 1 -5, a vision chart projector provided in this embodiment includes a projector base 1, on which a base ball sleeve 4 for placing a ball head 3 of a projector body 2 is provided, on which a ball joint 5 is threadedly connected to the base ball sleeve 4, and the ball joint 5 is provided with an external thread 15, half of which is threadedly connected to the base ball sleeve 4 and fixed with screw glue, and the other half is reserved for the base screw cover 7. A step is provided on the ball joint 5, and a ball head pressure gasket 6 is placed between the step and the base screw cover 7.

[0023] In the embodiments of the present utility model application, please refer to Figure 4 The portion where the ball head pressing gasket 6 contacts the ball head 3 is a spherical surface 14. By increasing the contact area between the two, the pressing force is enhanced.

[0024] In the embodiments of the present utility model application, please refer to Figure 1 The projector body 2 includes an upper cover 8 and a lower shell 9, wherein an optical component 10 and a PCB electronic component 11 are arranged in the lower shell 9, a front cover 12 is arranged at the front end of the lower shell 9, and a sheet metal frame 13 is arranged at the rear end of the lower shell 9. The front end of the upper cover 8 is snap-fitted with the front cover 12, and the rear end of the upper cover 8 is screwed with the sheet metal frame 13. When in use, the front end of the upper cover 8 is snap-fitted with the front cover 12, and then the rear end of the upper cover 8 is pressed down to be screwed with the sheet metal frame 13 by bolts.

[0025] In the embodiments of the present utility model application, please refer to Figure 3 , Figure 4 and Figure 5, the overall thickness of the ball head gasket 6 is C, and the step depth of the ball joint 5 is B, where C is greater than B. When the base screw cap 7 is screwed with the ball joint 5, the ball head gasket 6 can be driven to press down, and the pressure can be fully applied to the ball head 3 to make it firmly fixed. The inner diameter of the ball joint 5 is D, and the diameter of the ball head 3 is E, where D is equal to E. The ball head 3 can be positioned by the ball joint 5 to prevent the ball head from moving due to clearance.

[0026] A vision chart projector provided in this embodiment is connected as follows: the front end of the upper cover 8 is snap-connected with the front cover 12, and the rear end of the upper cover 8 is screwed with the sheet metal frame 13; the ball joint 5 is threadedly connected with the base ball sleeve 4, the pressure ball gasket 6 is placed flat on the step of the ball joint 5, and the base rotary cover 7 is threadedly connected with the ball joint 5.

[0027] Beneficial effects of the utility model: This new structure can rotate the projector body 2 by loosening the base cover 7, so that the up, down, left, and right positions of the projector body 2 can be adjusted, which brings convenience to actual users. At the same time, by opening the upper cover 8, the focusing point of the optical component 10 can be adjusted, and the PCB electronic component 11 can also be adjusted or repaired, so as to change the brightness of the projector.

[0028] In the description of the present invention, it should be noted that the terms "vertical", "up", "down", "horizontal", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and 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, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0029] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A vision chart projector, comprising a projector base (1), characterized in that: The projector base (1) is provided with a base ball head sleeve (4) for placing a ball head (3) of the projector body (2); a ball head joint (5) is connected to the base ball head sleeve (4); a step is provided on the ball head joint (5); a pressure ball head gasket (6) is placed on the step; a base screw cover (7) threadedly connected to the ball head joint (5) is provided on the pressure ball head gasket (6); the projector body (2) comprises an upper cover (8) and a lower shell (9); an optical component (10) and a PCB electronic component (11) are provided in the lower shell (9); a front cover (12) is provided at the front end of the lower shell (9); and a sheet metal frame (13) is provided at the rear end of the lower shell (9).

2. The visual acuity chart projector according to claim 1, characterized in that: The front end of the upper cover (8) is snap-connected to the front cover (12), and the rear end of the upper cover (8) is screw-connected to the sheet metal frame (13).

3. The visual acuity chart projector according to claim 1, characterized in that: The portion of the ball head pressing gasket (6) that contacts the ball head (3) is a spherical surface (14).

4. The visual acuity chart projector according to claim 1, characterized in that: The overall thickness of the ball head pressing gasket (6) is C, and the step depth of the ball head joint (5) is B, wherein C is greater than B.

5. The eye chart projector according to claim 1, characterized in that: The inner diameter of the ball joint (5) is D, and the diameter of the ball head (3) is E, wherein D is equal to E.

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