Lampshade blank and lampshade

Abstract

The lampshade blank comprises a lampshade body, the lampshade body is in a crescent semi-closed shell shape and comprises a first side and a second side, the wall thickness of the first side is larger than that of the second side, an injection molding opening is formed in the edge of the first side, and the wall thickness of the position, close to the injection molding opening, of the lampshade body is decreased along with increasing of the distance from the position of the injection molding opening. The mold filling speed of the central area is increased by increasing the wall thickness near the injection molding opening, the mold filling sequence that the central area is firstly filled and then extends towards the two ends is achieved, the defects that air trapping or weld lines are formed in the central area are overcome, and the product yield is increased.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of lamps, in particular to a lampshade blank and a lampshade. BACKGROUND

[0002] The existing lamps, especially the lamps of cars and electric vehicles, are increasingly unique in shape. In order to reduce wind resistance, it is usually necessary to design a streamlined shape. In order to reduce the weight of the lamp, the lampshade is designed to be as thin as possible. When the lampshade is injection molded, the injection port is usually arranged on one side, which leads to slow injection in the middle and fast injection at the edge on the side opposite to the injection port, resulting in a bottom gas trapping phenomenon. In addition, the edge of the lampshade is small, and the area that can bear force when the lampshade blank is ejected is small. If it is not cooled sufficiently, damage may occur at the ejection position. When two injection flows converge at a position during injection molding, a weld line may be formed. The lampshade blank may be deformed when it is not completely cooled. CONTENT OF THE UTILITY MODEL

[0003] The present application provides a lampshade to at least solve the above technical problems in the prior art.

[0004] According to a first aspect of the present application, a lampshade blank is provided, comprising a lampshade body, the lampshade body being in the shape of a half-enclosed shell in the shape of a crescent moon, the lampshade body comprising a first side and a second side, the wall thickness of the first side being greater than the wall thickness of the second side, an injection port being arranged at the edge of the first side, and the wall thickness of the lampshade body near the position of the injection port decreasing with the increasing distance from the position of the injection port.

[0005] In an implementable manner, the change in the wall thickness of the lampshade body in the direction of injection of the injection port is less than the change in the wall thickness perpendicular to the direction of injection of the injection port, so that the change in the transverse direction is greater, facilitating the longitudinal flow during injection molding. Thus, the injection mold is filled from the center of the first side to the center of the second side and then to both ends during injection molding, avoiding the convergence of two injection flows at a position to form a weld line. The final filling step is formed at the parting surface position, which can have a better exhaust effect.

[0006] In an implementable manner, the lampshade blank comprises a first lampshade body and a second lampshade body, the first lampshade body and the second lampshade body are arranged symmetrically with respect to the center of the first injection port, the first injection port is provided with a cross-flow channel, and the two ends of the cross-flow channel are connected with the first lampshade body and the second lampshade body, respectively. In this way, one mold can be used to produce two pieces, thereby improving the production efficiency.

[0007] In an implementable manner, the edge of the lampshade body is provided with an abutting rib plate, the abutting rib plate is arranged outwardly protruding with respect to the lampshade body, and the abutting rib plate further extends outwardly to provide a top plate. The top plate can be used to realize ejection by using a ejector rod, thereby avoiding damage to the lampshade body.

[0008] In an embodiment, the top plate is located at the second side, and the top plate comprises a first top plate, a second top plate and a third top plate, the first top plate is located at the first rib plate, the second top plate is located at the second rib plate, and the third top plate is located at the third rib plate, which can increase the stress area and has the function of overflow groove, thereby improving the qualified rate of the lampshade.

[0009] In an embodiment, the second rib plate and the third rib plate are symmetrically arranged on both sides of the first rib plate, which can make the stress more uniform.

[0010] In an embodiment, the second top plate is provided with a second boss, and the third top plate is provided with a third boss, which can realize the function of overflow groove, improve the qualified rate of the product, and increase the strength of the top plate to make the blank more easily ejected from the mold.

[0011] In an embodiment, the first side is provided with a fourth rib plate and a fifth rib plate, the fourth rib plate is provided with a fourth top plate, and the fifth rib plate is provided with a fifth top plate, which can make the stress more uniform on both sides.

[0012] According to a second aspect of the present application, a lampshade is provided, which is processed from the lampshade blank,

[0013] In an embodiment, the inner wall of the lampshade is provided with a semicircular conical rib, and the rib is arranged in a diverging manner with the injection port as the center, which can facilitate rapid filling, and the guiding effect of the rib can adjust the filling speed to avoid the situation that the local filling speed is too fast.

[0014] Compared with the prior art, the lampshade blank has the following beneficial effects: by increasing the wall thickness near the injection port, the center area filling speed is improved, the filling sequence of filling the center area first and then extending to both ends is realized, the defects such as trapped gas or weld lines in the center area are avoided, and the qualified rate of the product is improved.

[0015] It should be understood that the content described in this part is not intended to identify key or important features of the embodiments of the present application, nor is it used to limit the scope of the present application. Other features of the present application will become apparent through the following description. BRIEF DESCRIPTION OF DRAWINGS

[0016] The above and other objects, features and advantages of the example embodiments of the present application will be more apparent from the following detailed description read in conjunction with the accompanying drawings, in which several embodiments of the present application are shown by way of example, and in which:

[0017] In the drawings, the same or corresponding reference numerals indicate the same or corresponding parts.

[0018] Figure 1 The structure of the lampshade blank of the embodiment of the present application is shown.

[0019] Figure 2 A top view of a lampshade blank according to an embodiment of the application is shown;

[0020] Figure 3 A top view of a lampshade blank according to an embodiment of the application is shown; Figure 2 A half-sectional view of a lampshade according to an embodiment of the application is shown;

[0021] Figure 4 A top view of a lampshade according to an embodiment of the application is shown;

[0022] Figure 5 A top view of a lampshade according to an embodiment of the application is shown;

[0023] Figure 6 A top view of a lampshade according to an embodiment of the application is shown;

[0024] Figure 7 A half-sectional view of a lampshade according to an embodiment of the application is shown. DETAILED DESCRIPTION

[0025] In order to make the objectives, features and advantages of the application more obvious and easy to understand, the technical solutions in the embodiments of the application will be described clearly and completely below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only some of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the application.

[0026] As shown in Figure 1 , Figure 2 and Figure 3 , a lampshade blank includes a lampshade body 1, which is in the shape of a half-enclosed shell of a crescent moon and can form a complete enclosed space with other shell structures, and a circuit board, a light source and other components can be installed in the enclosed space. The lampshade body 1 includes a first side 11 and a second side 12, the wall thickness of the first side 11 is greater than that of the second side 12, an injection port is arranged at the edge position of the first side 11, and the wall thickness of the lampshade body 1 near the injection port 2 position decreases with the increase of the distance from the injection port 2 position. In order to ensure that the appearance of the lampshade does not change, the wall thickness of the lampshade body 1 is increased inwardly.

[0027] As shown in Figure 1 , Figure 2 and Figure 6 , the change of the wall thickness of the lampshade body 1 along the injection direction of the injection port 2 is less than the change of the wall thickness perpendicular to the injection direction of the injection port 2, as shown in Figure 6As shown, the injection direction is longitudinal, and the double-dotted line 3 is the equal wall thickness line. It can be seen that the wall thickness changes slowly in the longitudinal direction and changes quickly in the transverse direction. Therefore, the molding speed is faster in the longitudinal direction, and it can quickly reach the second side 12 from the first side 11, and then fill the mold to both ends. This filling sequence avoids the occurrence of defects such as trapped air and weld lines, and improves the product qualification rate.

[0028] like Figure 1 、 Figure 2 and Figure 3 As shown, the lampshade blank includes a first lampshade body 13 and a second lampshade body 14. The first lampshade body 13 and the second lampshade body 14 are arranged symmetrically relative to the center of the first injection molding port 5. The first injection molding port 5 is provided with a cross runner 4. The two ends of the cross runner 4 are respectively connected to the first lampshade body 13 and the second lampshade body 14. The position of the cross runner 4 can be provided with a side core pulling structure on the mold to assist molding, which can achieve smooth mold opening. Affected by the lampshade structure, more than two pieces need to be provided with injection molding ports 2 at other positions, and the blank also needs to be set into other shapes. The technical solution of this application is mainly aimed at one mold and two pieces. In order to show the difference between the lampshade blank and the lampshade, Figure 1 、 Figure 2 and Figure 3 In the figure, the first lampshade body 13 is in a blank state, and the second lampshade body 14 is in a final lampshade forming state.

[0029] like Figure 1 、 Figure 2 and Figure 3 As shown, an abutment rib 10 is provided at the edge of the lampshade body 1, and the abutment rib 10 is protruded outward relative to the lampshade body 1. The abutment rib 10 can be used to achieve positioning when the lampshade is buckled with other shells. A locking oblique hook structure can be set near the abutment rib 10, and the abutment rib 10 is further extended outward to set a top plate 9. The top plate 9 is a process structure and needs to be cut off after injection molding, but it greatly improves the qualified rate and structural performance of the lampshade product.

[0030] like Figure 1 、 Figure 2 and Figure 3 As shown, the top plate 9 is located on the second side 12 , and the top plate 9 includes a first top plate 91 , a second top plate 92 and a third top plate 93 . The first top plate 91 is located on the first rib 15 , the second top plate 92 is located on the second rib 16 , and the third top plate 93 is located on the third rib 17 .

[0031] like Figure 1 、 Figure 2 and Figure 3 As shown, the second rib 16 and the third rib 17 are symmetrically arranged on both sides of the first rib 15 .

[0032] like Figure 1 、 Figure 2 and Figure 3As shown, the second top plate 92 is provided with a second boss 96, and the third top plate 93 is provided with a third boss 97.

[0033] As shown in Figure 1 , Figure 2 and Figure 3 , the first side 11 is provided with a fourth rib plate 18 and a fifth rib plate 19, the fourth rib plate 18 is provided with a fourth top plate 94, and the fifth rib plate 19 is provided with a fifth top plate 95.

[0034] As shown in Figure 4 and Figure 5 , a lampshade is provided, which is processed using the above lampshade blank, the injection port 2 is represented by a dashed line, and the equal wall thickness position is represented by a double dotted line 3. It can be seen that the closer the position to the injection port 2, the thicker the wall thickness, which has a gradually changing trend. This position is the first side 11. The second side 12 is far away from the injection port 2 and can adopt an equal wall thickness structure or an unequal wall thickness structure. The wall thickness near the injection port 2 position can be set to 3.2mm or more, and the wall thickness far away from the injection port 2 position can be set to about 2.0mm.

[0035] As shown in Figure 7 , the inner wall 7 of the lampshade is provided with a semicircular conical rib 6, which is arranged in a diverging manner with the injection port 2 as the center. The rib 6 structure has the function of ensuring the strength of the lampshade main body structure, so it can be set inside the first side 11 and the second side 12. Of course, the mold also needs to be modified accordingly to set up a side core pulling structure, that is, the side core pulling structure is driven to move before demolding. It is easier to set the semicircular conical rib 6 on the outer wall 8 of the lampshade, and it is also simpler to set the side core pulling structure, but it has a certain influence on the appearance of the lampshade. For some lampshades that are hidden after installation, this design can be considered.

[0036] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A lampshade blank, characterized in that The lampshade blank comprises a lampshade body (1) in a half-enclosed shell shape of a crescent, the lampshade body (1) comprises a first side (11) and a second side (12), the wall thickness of the first side (11) is greater than that of the second side (12), an injection port (2) is arranged at the edge position of the first side (11), and the wall thickness of the lampshade body (1) near the position of the injection port (2) decreases with the increase of the distance from the position of the injection port (2).

2. The lamp shade blank of claim 1, wherein, The change of the wall thickness of the lampshade body (1) in the injection direction of the injection port (2) is less than the change of the wall thickness perpendicular to the injection direction of the injection port (2).

3. The lamp shade blank of claim 1, wherein, The lampshade blank comprises a first lampshade body (13) and a second lampshade body (14), the first lampshade body (13) and the second lampshade body (14) are arranged symmetrically with respect to the center of a first injection port (5), the first injection port (5) is provided with a cross-flow channel (4), and the cross-flow channel (4) is connected with the first lampshade body (13) and the second lampshade body (14) at two ends respectively.

4. A lampshade blank according to any one of claims 1-3, characterized in that The lampshade body (1) is provided with an abutting rib plate (10) at the edge position, the abutting rib plate (10) is arranged outwardly protruding with respect to the lampshade body (1), and the abutting rib plate (10) is further provided with a top plate (9) extending outwardly.

5. The lamp shade blank of claim 4, wherein, The top plate (9) is located at the second side (12), the top plate (9) comprises a first top plate (91), a second top plate (92) and a third top plate (93), the first top plate (91) is located at a first rib plate (15), the second top plate (92) is located at a second rib plate (16), and the third top plate (93) is located at a third rib plate (17).

6. The lamp shade blank of claim 5, wherein, The second rib plate (16) and the third rib plate (17) are symmetrically arranged on both sides of the first rib plate (15).

7. The lamp shade blank of claim 6, wherein, The second top plate (92) is provided with a second boss (96), and the third top plate (93) is provided with a third boss (97).

8. The lamp shade blank of claim 7, wherein, The first side (11) is provided with a fourth rib plate (18) and a fifth rib plate (19), the fourth rib plate (18) is provided with a fourth top plate (94), and the fifth rib plate (19) is provided with a fifth top plate (95).

9. A lamp shade characterised in that, The lampshade is processed by using the lampshade blank.

10. The lampshade of claim 9, wherein, The inner wall (7) of the lampshade is provided with a semicircular conical rib (6), and the rib (6) is arranged in a diverging manner with the injection port (2) as the center.

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