Lens molding

Abstract

To provide a lens molding which is used in an illumination device with multiple light sources arranged, can suppress illumination irregularity, and realizes weight reduction.SOLUTION: A lens molding 1 is used in an illumination device with multiple light sources arranged, and made of an injection molding body of resin that radiates light from the light sources. The lens molding has: multiple lens parts 2 arranged on a plane correspondingly to the light sources; a secondary runner part 4 that connects lens parts together; and a primary runner part 3 connected to the secondary runner part 4, in which a gate vestige g caused by injection molding is formed, and these are integrally molded. Spaces between runners 3a, 3b, 3c and 4a that constitute the primary runner part 3 and the secondary runner part 4 are hollowed out.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a lens molded body in which a plurality of lens portions are integrally molded, and more particularly to a lens molded body used in a lighting device for an elevator cab. [Background technology]

[0002] 2. Description of the Related Art A known lighting device includes a light source unit in which a plurality of light sources are arranged. Such lighting devices are widely used for various purposes, for example, as lighting devices for elevator cabs.

[0003] Generally, elevator cabs are ceiling-lit with a lighting device installed on the ceiling. A known configuration of ceiling lighting is one in which a light source unit is attached to the underside of the ceiling and a transparent lighting plate is attached below the light source unit. Patent Document 1 proposes a lighting device for elevator cabs in which a plate-shaped intermediate member (e.g., a resin half mirror) with light transmitting and reflecting properties is arranged between the light source and the lighting plate. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 6-183670 Summary of the Invention [Problem to be solved by the invention]

[0005] Incidentally, in the case of ceiling lighting as described above, for example, the height (thickness) of the lighting device affects the overall height of the space such as the car room. Therefore, from the viewpoint of space saving, it is desirable to reduce the height of the lighting device.

[0006] However, simply reducing the distance between the light source and the lighting plate in order to reduce the height of the lighting device makes lighting unevenness more likely to occur. For example, in the case of an LED light source, the dot effect becomes more noticeable. On the other hand, it is possible to provide a plate-shaped intermediate member between the light source and the lighting plate as in Patent Document 1, but this tends to increase the weight, which can be problematic, particularly in ceiling lighting (e.g., lighting devices for elevator cabs).

[0007] The present invention has been made in consideration of the above circumstances, and aims to provide a lens molding for use in an illumination device in which multiple light sources are arranged, which can suppress illumination unevenness and achieve lightweight construction. [Means for solving the problem]

[0008] The lens molded body of the present invention is used in an illumination device in which a plurality of light sources are arranged, and is a lens molded body made of an injection-molded resin that irradiates light from the light sources, wherein the lens molded body has a plurality of lens portions arranged on a plane corresponding to the light sources, a secondary runner portion that connects the lens portions to each other on the plane, and a primary runner portion that is connected to the secondary runner portion on the plane and has a gate mark formed by injection molding, and these are molded integrally, and when viewed in a plane, the space between the runners that constitute the primary runner portion and the secondary runner portion is hollowed out.

[0009] The primary runner section has a first runner on which the gate mark is formed and extends in one direction, and at least one of the width dimension and thickness dimension of the first runner is larger than the dimensions of the runner constituting the secondary runner section.

[0010] The primary runner section has a second runner extending perpendicularly from both ends or approximately the center of the first runner, and at least one of the width and thickness dimensions of the second runner is larger than the dimensions of the runners constituting the secondary runner section.

[0011] For example, the thickness dimension of the first and second runners may be greater than the thickness dimension of the runner constituting the secondary runner portion, and the primary and secondary runner portions may be formed so that their incident side surfaces are flush with each other.

[0012] In a plan view, the filling distance from the gate mark to each of the lens portions is equal to each other. The filling distance is the shortest path from the gate mark (or each gate mark if there are multiple gate marks) through the runner to each of the lens portions.

[0013] In the lens molding, the secondary runner portion is characterized in that it connects to the lens portions located at the outermost periphery so as to go around them.

[0014] The lens portion has a lens body having a circular shape in a plan view, and a peripheral portion formed on the periphery of the lens body and to which the secondary runner portion is connected, and the peripheral portion has a circular front-rear shape in a plan view when viewed from the gate mark side. Viewed from the gate mark side means viewed from the gate mark side end (i.e., the resin inflow side end) of the lens portion on the shortest path from the gate mark (each gate mark if there are multiple gate marks) through the runner to the lens portion.

[0015] The lens body is characterized in that it has a meniscus shape that is convex toward the irradiation side.

[0016] The lens molding is characterized in that the lighting device is used as a lighting device for an elevator car.

[0017] The lens molded body of the present invention is used in an illumination device in which a plurality of light sources are arranged, and is a lens molded body made of a resin injection molded body that irradiates light from the light sources and has a gate mark formed thereon, and is characterized in that the lens molded body has a plurality of lens portions and a plurality of runners arranged on a plane corresponding to the light sources, which are molded integrally, the spaces between the runners are hollowed out in a planar view, and the filling distances from the gate mark to each of the lens portions passing through the runners are equal to each other. Effect of the Invention

[0018] The lens molding of the present invention has a plurality of lens parts, a primary runner part, and a secondary runner part, which are molded integrally, and the runners constituting the primary runner part and the secondary runner part are hollowed out, i.e., a space is formed between them. As a result, the light from the light source is diffused by the lens parts, which can suppress uneven illumination, and the lens molding is lightweight. In addition, the lens parts are connected to each other by the secondary runner part, and the lens parts that affect uneven illumination are filled via the primary runner part and the secondary runner part. Therefore, the molding pressure is easily equalized, the shape of each lens part is made uniform, and this leads to suppression of uneven illumination, etc.

[0019] The primary runner portion has a first runner with a gate mark formed thereon and extending in one direction, and at least one of the width dimension and thickness dimension of the first runner is larger than the dimension of the runner constituting the secondary runner portion, so that the lens molding can be made lighter while ensuring strength against torsion and the like. As a result, each lens portion can be positioned at an appropriate position, which leads to suppression of uneven illumination and the like. Furthermore, the primary runner portion has second runners extending perpendicularly from both ends or approximately the center of the first runner, and at least one of the width dimension and thickness dimension of the second runner is also larger than the dimension of the runner constituting the secondary runner portion, and the first runner and the second runner that are perpendicular to each other on a plane are formed wider or thicker than the other runners, so that the lens molding can be made lighter while ensuring strength against torsion and the like.

[0020] In plan view, the filling distances from the gate mark to each lens portion are equal to each other, so that the lens portions can be formed uniformly, making it easier to effectively suppress uneven illumination.

[0021] In the above-mentioned lens molding, the secondary runner portion is connected in a circle around the lens portion located at the outermost periphery of the lens portion, thereby making it easier to ensure strength against twisting and the like while achieving weight reduction, and is also effective in controlling the filling behavior into the lens portion.

[0022] The lens portion has a lens body that is circular in plan view, and a peripheral portion formed on the periphery of the lens body to which the secondary runner portion is connected. The planar shape of the peripheral portion is a front-rear circular shape when viewed from the gate mark side. Therefore, it is easier to suppress the occurrence of welds in the lens portion compared to, for example, when the peripheral portion is circular in plan view. [Brief description of the drawings]

[0023] [Figure 1] FIG. 1 is a perspective view of one embodiment of a lens molding of the present invention. [Diagram 2] FIG. 2 is a plan view of the lens molding of FIG. [Diagram 3]FIG. 2 is a partial cross-sectional view of the lens molding of FIG. [Figure 4] FIG. 2 is a diagram for explaining the flow of resin during injection molding of the lens molded body of FIG. [Diagram 5] 1 is a schematic diagram of a car interior lighting device to which the lens molding of the present invention is applied. [Figure 6] FIG. 2 is a perspective view of another embodiment of the lens molding of the present invention. [Figure 7] FIG. 2 is a perspective view of another embodiment of the lens molding of the present invention. [Figure 8] FIG. 8 is a diagram for explaining a cavity and the like during injection molding of the lens molded body of FIG. [Figure 9] FIG. 11 is a perspective view of a lens molding as a comparison example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0024] One embodiment of the lens molded body of the present invention will be described with reference to Figures 1 to 3. The lens molded body shown in these figures is used, for example, as a lens that irradiates light from a light source in an illumination device in which a plurality of light sources are arranged.

[0025] FIG. 1 is a perspective view of the main plane of a lens molded body as viewed from the irradiation side. The opposite side to the irradiation side is the incident side where light from a light source is incident. The lens molded body 1 is made of an injection molded synthetic resin. As shown in FIG. 1, the lens molded body 1 has a plurality of lens parts 2, a primary runner part 3, and a secondary runner part 4, and the plurality of lens parts 2, the primary runner part 3, and the secondary runner part 4 are molded integrally. In the lens molded body of the present invention, the runner part used when injection molding the plurality of lens parts is incorporated into a part of the product.

[0026] As shown in FIG. 1, the runners 3a, 3b, 3c, and 4a constituting the primary runner portion 3 and the secondary runner portion 4 are hollowed out. That is, a space is formed in the area surrounded by the runners. This allows for a significant weight reduction compared to a plate-like lens molding (see FIG. 9) that is normally assumed. For example, the weight can be reduced to 1 / 3 to 2 / 3 of the weight of the lens molding 51 in FIG. 9. The lens molding 51 in FIG. 9 is a plate-like member in which a plurality of lens portions 52 are integrally molded. The lens molding 51 is formed with a plurality of ribs 53 extending in orthogonal directions, and each lens portion 52 is partitioned by the ribs 53.

[0027] The configuration of each part of the lens molding 1 will be specifically described below.

[0028] The resin material of the lens molding 1 is a transparent resin such as an acrylic resin or a polycarbonate resin. The lens molding 1 has a gate mark g at a position corresponding to a gate portion for filling resin during injection molding. In Fig. 1, the gate mark g is formed at the center position in a plan view of the lens molding 1 (see Fig. 2). It is preferable that the gate mark g is formed on the irradiation side.

[0029] In the lens molding 1, a plurality of lens portions 2 are arranged on a plane (the xy plane in FIG. 2) corresponding to the light source. In this case, the xy plane is a plane perpendicular to the optical axis of the light source. The lens molding 1 has a total of 16 lens portions 2 arranged in a 4×4 arrangement. The arrangement of the lens portions is not limited to that shown in FIG. 1. For example, in the case of m×n lens portions, m and n may be independent integers, and m and n may be even numbers or the same number.

[0030] Each lens portion 2 has a lens body 2a having a circular shape in a plan view and a peripheral portion 2b. The lens body 2a has a meniscus shape convex toward the irradiation side (see FIG. 3), but may be, for example, a biconvex lens or a plano-convex lens.

[0031] As shown in FIG. 1, the secondary runner section 4 has a plurality of runners 4a (for example, a total of 18 in FIG. 1) and connects the lens sections 2 to each other. The runners 4a have runners that are connected to the primary runner section 3 and runners that are not connected to the primary runner section 3. In the configuration of FIG. 1, the runners that are not connected to the primary runner section 3 are the last to be filled with resin, and also serve as an escape route when air is filled in the mold. Each lens section 2 is connected to two or three other lens sections adjacent to each other on a plane by the secondary runner section 4. The runners 4a constituting the secondary runner section 4 are columnar sections having predetermined width and thickness dimensions. In FIG. 1, the width dimensions of each runner 4a are equal to each other, and the thickness dimensions are also equal to each other.

[0032] The width dimension of the runners is the dimension perpendicular to the direction in which each runner extends when the lens molding is viewed in plan, and the thickness dimension of the runners is the dimension in the direction along the optical axis of the light source.

[0033] Moreover, the secondary runner portion 4 connects the lens portions (12 lens portions in FIG. 1) located at the outermost periphery among the multiple lens portions 2 in a circular manner, and the outer contour of the lens molding 1 has a rectangular shape. By connecting the lens portions at the outermost periphery in a circular manner, it becomes easier to ensure strength against twisting, etc., and as a result, it becomes easier to arrange each lens portion 2 in an appropriate position for each light source. It is also effective in controlling the filling behavior inside the lens portions 2.

[0034] As shown in Fig. 1, the primary runner section 3 is connected to the secondary runner section 4, and a gate mark g is formed by injection molding. During injection molding, molten resin is filled from the gate section into the cavities corresponding to the primary runner section 3, the secondary runner section 4, and the lens section 2, in that order.

[0035] The primary runner section 3 has multiple runners 3a, 3b, and 3c (for example, a total of seven in FIG. 1), and each runner is a columnar section having a predetermined width and thickness. Specifically, the primary runner section 3 has a first runner 3a extending in one direction with a gate mark g formed approximately in the center, second runners 3b extending perpendicularly from both ends of the first runner 3a to both sides, and a third runner 3c extending perpendicularly from both ends of the second runner 3b to both sides. The first and second runners 3a and 3b are H-shaped and are disposed on the center side of the lens molding 1.

[0036] In Fig. 1, the width and thickness of the first and second runners 3a, 3b are larger than those of the third runner 3c and the runner 4a constituting the secondary runner portion 4. By making the first and second runners 3a, 3b, which form the main framework of the lens molding 1, wider and thicker than the other runners, it becomes easier to ensure the strength of the entire lens molding. Also, by increasing the volume of the cavity in the portion close to the gate portion, which is likely to be subjected to a relatively high molding pressure, it becomes easier to uniformly fill the entire cavity with resin.

[0037] In the configuration of Fig. 1, either one of the width dimension and thickness dimension of the first and second runners 3a, 3b may be made larger than the other runners. Similarly, the third runner 3c may be formed to be wider and thicker than the runner 4a, similar to the first and second runners 3a, 3b.

[0038] Next, an explanation will be given with reference to FIG. 2. FIG. 2 is a plan view of the irradiation side. As shown in FIG. 2, in the lens molding 1, each part is configured so that the filling distance from the gate mark g to each lens part is equal. That is, in the lens molding 1, the distance from the gate mark g to each lens part passing through the primary runner part 3 and the secondary runner part 4 is equal to each other. For example, the distance L from the gate mark g to the lens part 2A is A is the distance L from the gate mark g to the lens part 2B B , the distance L from the gate mark g to the lens part 2C C , the distance L from the gate mark g to the lens part 2DD By arranging the parts so that the above distances are equal, it becomes easier to fill the lens part 2 with resin uniformly, and as a result, it becomes easier to mold the lens part 2 uniformly.

[0039] In each lens portion (for example, lens portion 2D), a peripheral portion 2b is formed on the periphery of the lens body 2a, and a secondary runner portion 4 is connected to the peripheral portion 2b. In this case, the lens body 2a is island-shaped. The planar shape of the peripheral portion 2b is not particularly limited, and may be, for example, a circular or rectangular shape, but may also be a front-rear circular shape as viewed from the gate mark side, as shown in FIG. 2. In this case, the gate mark side end of the lens portion 2D on the shortest path from the gate mark g through the primary runner portion 3 and the secondary runner portion 4 to the lens portion 2D is defined as the front side.

[0040] FIG. 3 shows a cross-sectional view taken along line AA in FIG. 2. As shown in FIG. 3, the thickness dimension of the second runner 3b (the same goes for the first runner) is greater than the thickness dimension of the runner 4a constituting the secondary runner portion 4. In this configuration in which the thickness dimension is partially thicker, in FIG. 3, a portion corresponding to the difference in thickness dimension protrudes toward the irradiation side of the lens molding 1. In addition, the primary and secondary runner portions are formed so that their incident side surfaces are flush with each other. That is, the incident side surfaces of the first runner, second runner 3b, and third runner of the primary runner portion, and the runner of the secondary runner portion are formed so that they are flush with each other.

[0041] For example, if the incident side surfaces of the first runner and the second runner 3b protrude toward the incident side, there is a risk that the light emitted from the light source may be obstructed when entering the lens body 2a, and by forming them flush as shown in Fig. 3, it becomes easier to prevent such problems from occurring. Also, it becomes easier to attach the lens molding 1 to the substrate of the light source, etc.

[0042] Next, the flow of resin during injection molding will be described with reference to Fig. 4. Fig. 4 shows an outline of the process of injecting and filling a molding cavity formed by an injection molding die (not shown). The molding cavity has a shape corresponding to the lens molding of the present invention. In Fig. 4, molding cavity 11 has cavities 12a, 12b, 13a, 13b, 13c, and 14 that respectively correspond to the lens portion of the lens molding, the first runner, the second runner, and the third runner of the primary runner portion, and the runner of the secondary runner portion of the lens molding.

[0043] Molten resin sent out from the injection molding machine passes through sprue 15 and is filled into molding cavity 11 through gate 16. In FIG. 4, resin is filled from what would be called the irradiation side of the lens molding. The resin flowing in from gate 16 becomes multiple branched flows and reaches cavity 12 corresponding to the lens portion. Specifically, the molten resin flows from gate 16 toward both ends of cavity 13a, then branches into cavities 13b and 13c, and then the branched flows that are further divided at cavity 14 flow into cavity 12.

[0044] In the cavity 12, the cavity 12a corresponding to the lens body may have a narrow resin flow path due to the lens shape. In that case, the resin flows in a straight line toward the cavity 12b corresponding to the peripheral portion of the cavity 12, that is, the resin flows in a parallel flow within the range of the cavity 12b. In such a configuration, if the cavity 12b is circular, for example, the resin is likely to flow around to the back side of the cavity 12b, and as a result, it is thought that a weld line is likely to be formed due to the joining of the resin.

[0045] In contrast, if the planar shape of cavity 12b is a front-circle rear shape, as described above, the flow of resin when it flows around to the back side of cavity 12b is moderately disturbed, making it easier to suppress the formation of weld lines.

[0046] In Fig. 4, resin flows into cavity 12 and then into another connected cavity 14, filling the entire molding cavity 11 with resin. After a certain period of pressure retention, the resin is cooled to solidify, and the mold is opened to obtain an injection molded body. The sprue of the obtained injection molded body is cut by processing, and a gate mark is formed in the lens molded body.

[0047] Fig. 5 shows an example of a usage mode of the lens molded body of the present invention, in which it is used in a lighting device for an elevator car. Fig. 5 is a schematic diagram of the entire elevator car. Note that the opening and closing door is omitted.

[0048] As shown in FIG. 5, the lighting device 22 is disposed above the space in the car room 21 where the passengers sit. The lighting device 22 has a plurality of light sources 23 provided on the ceiling 21a and a transparent lighting plate 25 provided below and facing the light sources 23, and the lens molded body 24 of the present invention is provided between the light sources 23 and the lighting plate 25. Each lens portion 24a of the lens molded body 24 is installed so as to receive light from each light source 23. The lens portion 24a of the lens molded body 24 diffuses the light from the light sources 23, thereby suppressing uneven illumination. As a result, even if the distance between the light source 23 and the lighting plate 25 is reduced, for example, uniform illumination is easily achieved. In addition, the lens molded body 24 of the present invention is lightweight, which also leads to a reduction in the weight of the entire lighting device 22.

[0049] As the light source 23, for example, an LED is used, but is not limited to this. In Fig. 5, a board 23a on which a total of 16 LEDs (4 x 4) are mounted is attached to the ceiling 21a. The illumination plate 25 is made of, for example, resin, and may be configured to be attached to a suspended ceiling structure.

[0050] Furthermore, the lens molded body 24 is attached to the substrate 23a of the light source 23 or the ceiling 21a by, for example, a fixing portion 26 (such as a hook or a boss portion). The fixing portion 26 is provided, for example, on a runner of a primary runner portion or a secondary runner portion. The fixing portion 26 may be formed as a part of the lens molded body 24, or may be molded integrally with the lens portion or the like during injection molding.

[0051] Fig. 6 shows a perspective view (irradiation side) of another embodiment of the lens molding of the present invention. In this embodiment as well, the lens molding 31 is made of an injection molded synthetic resin, and has a plurality of lens portions 32, a primary runner portion 33, and a secondary runner portion 34, which are molded integrally. In addition, the spaces between the runners 33a, 33b, 33c, and 34a constituting the primary runner portion 33 and the secondary runner portion 34 are hollowed out to reduce weight. Descriptions of similar configurations compared to the lens molding 1 in Fig. 1 will be omitted, and differences will be described below.

[0052] In the lens molded body 31 of Fig. 6, the first runner 33a, second runner 33b, and third runner 33c of the primary runner portion 33 and the runner 34a of the secondary runner portion 34 have the same width and thickness dimensions. Furthermore, the lens portion 32 does not have a peripheral portion, and is composed of a lens body. In this case, the runner 34a of the secondary runner portion 34 is connected to the lens body. Furthermore, the secondary runner portion 34 is not connected to go around the lens portion 32 located at the outermost periphery of the lens portion 32, and some of the runners are omitted.

[0053] With respect to lens molding 1 in FIG. 1 and lens molding 31 in FIG. 6, for example, from the viewpoint of weight reduction, lens molding 31 can be said to be the more preferable form, and from the viewpoint of ensuring strength, lens molding 1 can be said to be the more preferable form.

[0054] Fig. 7 shows a perspective view (irradiation side) of another embodiment of the lens molding of the present invention. The lens moldings in Fig. 1 and Fig. 6 above have one gate mark (one-point direct gate type), but Fig. 7 has eight gate marks (eight-point pin gate type).

[0055] Lens molding 41 is made of an injection-molded synthetic resin and has a plurality of lens portions 42, a primary runner portion 43, and a secondary runner portion 44, which are molded integrally. In addition, the spaces between runners 43a, 43b, 43c, and 44a constituting primary runner portion 43 and secondary runner portion 44 are hollowed out to reduce weight.

[0056] In FIG. 7, the primary runner portion 43 is connected to the secondary runner portion 44, and a gate mark g is formed by injection molding. The primary runner portion 43 has a plurality of runners 43a, 43b, and 43c, and each runner is a columnar portion having a predetermined width and thickness. Specifically, the primary runner portion 43 has a third runner 43c that passes through the approximate center of the product and extends in one direction, second runners 43b that extend perpendicularly from both ends of the third runner 43c to both sides, and a first runner 43a that extend perpendicularly from both ends of the second runner 43b to both sides. Gate marks g are formed at both ends of each first runner 43a (a total of eight in the lens molding 41). The second and third runners 43b and 43c are H-shaped and are disposed on the center side of the lens molding 41.

[0057] 7, the width and thickness dimensions of the first, second and third runners 43a, 43b, 43c are greater than those of runner 44a constituting secondary runner portion 44. By making the second and third runners 43b, 43c, which form the main framework of lens molding 41, wider and thicker, it becomes easier to ensure the strength of the entire lens molding.

[0058] Further, in lens molding 41, each portion is configured so that the filling distance from each gate mark g to each lens portion 42 is equal. Even in this configuration, in lens portion 42, the shape of the peripheral portion in plan view is a front circular rear shape when viewed from the gate mark side.

[0059] Fig. 8 explains the cavity during injection molding of the lens molding of Fig. 7. In Fig. 8, molding cavity 47 has cavities corresponding to the lens portion of the lens molding of Fig. 7, the first runner, the second runner, and the third runner of the primary runner portion, and the runner of the secondary runner portion, respectively.

[0060] The molten resin discharged from the injection molding machine is filled into a sprue 45 and branches into multiple paths to be filled into each molding cavity 47 from eight gates 46. The resin flowing in from each gate 46 flows into the cavities of each lens part via the cavities of the primary runner part and the secondary runner part.

[0061] The injection molding in Figure 8 uses multiple pin gates, and the sprue is automatically separated when the mold is opened, eliminating the need for gate cutting. In addition, the molding pressure on the lens cavity can be improved.

[0062] 7 shows a lens molding having eight gate marks, but the present invention is not limited to this and may have a plurality of gate marks. For example, a configuration may be used in which there are two or four gate marks so that the filling distance from each gate mark to each lens portion is equal.

[0063] The lens molded body of the present invention is not limited to the configurations of the lens molded body shown in Figures 1, 6, and 7. In addition, the lens molded body can be used as a lens member for various lighting devices equipped with multiple light sources. [Industrial Applicability]

[0064] The lens molded body of the present invention is a lens molded body used in a lighting device in which a plurality of light sources are arranged, and since it can suppress uneven illumination and achieves weight reduction, it can be widely used in lighting devices. In addition, the weight reduction leads to a reduction in the amount of resin, which also leads to resource conservation and cost reduction. [Explanation of symbols]

[0065] 1 Lens molding 2, 2A, 2B, 2C, 2D Lens section 2a Lens body 2b Periphery 3. Primary Runner Section 3a 1st runner 3b 2nd runner 3c 3rd runner 4 Secondary runner section 4a Runner 11 Molding cavity 12a, 12b, 13a, 13b, 13c, 14 Cavity 15 sprues 16 Gate section 21 Cage Room 22 Lighting equipment 23 Light source 24 Lens molding 25 Lighting Board 26 Fixed part 31 Lens molding 32 Lens section 33 Primary Runner Section 33a 1st runner 33b 2nd runner 33c 3rd runner 34 Secondary Runner Section 34a Runner 41 Lens molding 42 Lens section 43 Primary Runner Section 43a 1st runner 43b 2nd runner 43c 3rd runner 44 Secondary Runner Section 44a Runner 45 sprues 46 Gate Section 47 Molding Cavity g Gate mark

Claims

1. A lens molded body made of a resin injection molded body, which is used in an illumination device in which a plurality of light sources are arranged, and which irradiates light from the light sources, the lens molding has a plurality of lens portions arranged on a plane corresponding to the light sources, a secondary runner portion connecting the lens portions to each other, and a primary runner portion connected to the secondary runner portion and having a gate mark formed thereon by injection molding, and these are integrally molded; A lens molding characterized in that a space between the runners constituting the primary runner portion and the secondary runner portion is hollowed out.

2. The lens molding according to claim 1, characterized in that the primary runner portion has a first runner on which the gate mark is formed and extends in one direction, and at least one of the width dimension and thickness dimension of the first runner is larger than the dimension of the runner constituting the secondary runner portion.

3. The lens molding described in claim 2, characterized in that the primary runner portion has second runners extending perpendicularly from both ends or approximately the center of the first runner, and at least one of the width and thickness dimensions of the second runner is larger than the dimensions of the runners constituting the secondary runner portion.

4. 3. The lens molding according to claim 1, wherein, in a plan view, the filling distances from the gate mark to each of the lens portions are equal to each other.

5. 3. The lens molding according to claim 1, wherein the secondary runner portion connects the lens portions located at the outermost periphery of the lens portions in a manner that makes a full circle.

6. The lens portion has a lens body having a circular shape in a planar view, and a peripheral portion formed on the periphery of the lens body and to which the secondary runner portion is connected, and the planar shape of the peripheral portion is a front-to-rear circle shape when viewed from the gate mark side.

7. 7. The lens molding according to claim 6, wherein the lens body has a meniscus shape convex on the irradiation side.

8. 3. The lens molded body according to claim 1, wherein the lighting device is used as a lighting device for an elevator car.

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