CN110733165A

CN110733165A - Mold and resin component

Info

Publication number: CN110733165A
Application number: CN201910635293.3A
Authority: CN
Inventors: 松原永治
Original assignee: Koito Manufacturing Co Ltd
Current assignee: Koito Manufacturing Co Ltd
Priority date: 2018-07-19
Filing date: 2019-07-15
Publication date: 2020-01-31
Also published as: JP2020011473A; JP7198010B2; CN210651699U

Abstract

A mold (100) forms a molding space (102) corresponding to a plate-shaped resin member having two main surfaces facing away from each other and a plurality of side surfaces connecting the two main surfaces, the mold includes a -th surface (112) corresponding to an -th side surface of the side surfaces, a second surface (114) corresponding to a -th main surface and a third surface (122) corresponding to the second main surface, and a gate (124) connected to the -th surface and injecting a molten resin into the molding space, wherein a dimension (124H) of the gate in a direction in which the second surface and the third surface are arranged is half or less of a dimension (112H) of the -th surface in the direction in a region (112R) of the gate extending from the gate.

Description

Mold and resin component

Technical Field

The present invention relates to a mold and a resin member, and more particularly to a mold for manufacturing a resin member used for a vehicle lamp and a resin member manufactured by using the mold.

Background

Conventionally, there is known a vehicle lamp that emits light from a light source to the front of the lamp through a light guide. For example, patent document 1 discloses a vehicle lamp having the following structure: light is made to enter the plate-like light guide member from the side surface and is reflected by a reflecting element such as a step provided on the main surface on the inner side of the lamp, so that the light is made to exit from the main surface on the outer side of the lamp toward the front of the lamp.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open No. 2014-116142

Disclosure of Invention

Problems to be solved by the invention

The present inventors have made extensive studies on a vehicle lamp having a plate-shaped light guide member, and have conceived a usage mode in which light is emitted not only from a main surface but also from a side surface of the plate-shaped light guide member. However, it has been found that when the plate-shaped light guide member obtained by the conventional manufacturing method is used in this manner, light emission unevenness may occur on the light emitting surface of the plate-shaped light guide member or the amount of incident light to the plate-shaped light guide member may be reduced.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a technique for obtaining a plate-shaped light guide member suitable for use in a mode of emitting light from a main surface and a side surface.

Means for solving the problems

To solve the above problems, modes of the present invention are types of molds that form a molding space corresponding to a plate-shaped resin member having two main surfaces facing away from each other and a plurality of side surfaces connecting the two main surfaces, and that have a th surface corresponding to a th surface among the side surfaces, a second surface corresponding to the th surface, a third surface corresponding to the second main surface, and a gate connected to a th surface and used for injecting a molten resin into the molding space, wherein a dimension of the gate in a direction in which the second surface and the third surface are arranged is half or less of a dimension of an th surface in a region in which the gate extends.

In addition to the above aspect, the gate may be in contact with a boundary between the th surface and the second surface, or in contact with a boundary between the th surface and the third surface, and in any of the aspects described above, the resin member may be a light guide member that includes a light diffusing material, reflects light incident from a side surface of the th side surface and a side surface different from the th side surface by the light diffusing material, and causes light to be emitted from another side surface and at least side main surfaces, and the size of the gate in the direction in which the second surface and the third surface are aligned may be or less of the size of the th surface in the direction in which the gate extends.

Another embodiment of the present invention is kinds of resin members, each of which is a plate-shaped resin member having two main surfaces facing away from each other and a plurality of side surfaces connecting the two main surfaces, wherein the resin member has a gate mark on a th side surface among the side surfaces, and a dimension of the gate mark in a direction in which the two main surfaces are aligned is half or less of a dimension of the th side surface in the direction in which the gate mark extends.

The resin member may be a light guide member that contains a light diffusing material and reflects light incident from a side surface of side out of side surfaces and side surfaces different from side surfaces by the light diffusing material and causes light to be emitted from another side surface and at least side surface, the gate mark may have a size in a direction in which both main surfaces are aligned, or less which is a third of a size in the direction in a region in which the gate mark extends in the side surface, and the light diffusing material may be metal oxide particles having an average particle diameter of 150nm to 500 nm.

Effects of the invention

According to the present invention, a plate-shaped light guide member suitable for use in a mode of emitting light from a main surface and a side surface can be obtained.

Drawings

Fig. 1 is a sectional view of a vehicle lamp including a resin member according to an embodiment.

Fig. 2(a) is a perspective view of the resin member and the light source, and fig. 2(B) is a front view of the resin member.

Fig. 3(a) and 3(B) are schematic diagrams for explaining a method of measuring the light emission efficiency of the plate-shaped light guide member.

Fig. 4(a) is a sectional view of a mold according to the embodiment, and fig. 4(B) is a sectional view taken along the line a-a of fig. 4 (a).

Fig. 5(a), 5(B), and 5(C) are views schematically showing a process for producing a resin member.

Description of the reference numerals

10: a plate-shaped light guide member, 10 a: th main surface, 10 b: second main surface, 10 c: th side surface, 11: a light diffusing material, 14: a gate mark, 16: a molten resin, 100: a mold, 102: a molding space, 112: th surface, 114: second surface, 122: third surface, and 124: a gate.

Detailed Description

The present invention will be described below based on preferred embodiments with reference to the accompanying drawings, wherein the embodiments are not intended to limit but to exemplify the invention, and all features and combinations thereof described in the embodiments are not which are essential contents of the invention, the same or equivalent constituent elements, members and processes shown in the respective drawings are denoted by the same reference numerals, and repetitive descriptions are omitted as appropriate, and the scale and shape of each portion shown in the respective drawings are appropriately set for easy description, and are not intended to be construed restrictively unless otherwise specified, and when a term such as "" or "second" is used in the present specification or claims, the term does not indicate any order or importance unless otherwise specified, but is used for distinguishing structures from other structures, and in addition, a part of the members which are not important in describing the embodiments are omitted in the respective drawings.

Fig. 1 is a sectional view of a vehicle lamp including a resin member according to an embodiment, fig. 2(a) is a perspective view of the resin member and a light source, fig. 2(B) is a front view of the resin member, and fig. 1 illustrates only a portion of the vehicle lamp, the vehicle lamp 1 of the embodiment includes pairs of headlamp units disposed on the left and right sides of the front of the vehicle, and fig. 1 illustrates a -side headlamp unit structure because pairs of headlamp units have substantially the same configuration except for points, which are a bilaterally symmetrical structure.

The vehicle lamp 1 includes a lamp body 2 having an opening on a vehicle front side, and a light-transmitting cover 4 covering the opening of the lamp body 2. A light source 8, a plate-shaped light guide member 10, and a holder 12 are accommodated in a lamp chamber 6 formed by the lamp body 2 and the light-transmitting cover 4.

The light source 8 is, for example, an LED (light emitting diode). The light source 8 may be an LD (laser diode), another semiconductor light emitting element such as an organic or inorganic EL (electroluminescence), an incandescent lamp, a halogen lamp, a discharge lamp, or the like.

The plate-shaped light guide member 10 is examples of the resin component according to the present embodiment, the plate-shaped light guide member 10 is a light-transmitting plate-shaped member made of a transparent thermoplastic resin such as a polycarbonate resin or an acrylic resin, or a thermosetting resin, and the plate-shaped light guide member 10 as the resin component is formed by injection molding of a resin using a mold described later.

The plate-shaped light guiding member 10 has two main surfaces a and 10b facing away from each other, and a plurality of side surfaces connecting the two

main surfaces

10a, 10b, the side surfaces of the plate-shaped light guiding member 10 include a th side surface 10c, a second side surface 10d, a third side surface 10e, and a fourth side surface 10f, the th side surface 10c and the second side surface 10d facing away from each other, and the third side surface 10e and the fourth side surface 10f facing away from each other.

The plate-like light guide member 10 has a gate mark 14 on the th side surface 10c, and the dimension 14H of the gate mark 14 in the direction X1 in which the two

main surfaces

10a and 10b are aligned is half or less, more preferably third or less, of the dimension 10H in the direction X1 in the region 10R of the th side surface 10c in which the gate mark 14 extends, and the gate mark 14 is disposed so as to be in contact with the boundary between the th side surface 10c and the second main surface 10 b.

The plate-like light guide member 10 of the present embodiment has a uniform thickness as a whole, and the gate mark 14 is in the form of a strip and extends parallel to the th main surface 10a and the second main surface 10b, and therefore, the width of the gate mark 14 is half or less of the distance between the two

main surfaces

10a and 10b of the plate-like light guide member 10, in other words, half or less, more preferably or less of the thickness of the plate-like light guide member 10, the width (dimension 14H) of the gate mark 14 is, for example, 0.3mm to 0.5mm, and the length (dimension in a direction parallel to the

main surfaces

10a and 10 b) of the gate mark 14 is, for example, 10mm to 100 mm.

The light source 8 is disposed such that a light emitting surface faces the second side surface 10d, and therefore, the light of the light source 8 enters the plate-shaped light guide member 10 from the second side surface 10d, as shown in an enlarged view of a broken line region R in fig. 1, the plate-shaped light guide member 10 contains a light diffusing material 11 therein, the light entering from the second side surface 10d is reflected by the light diffusing material 11 and exits from the th side surface 10c and the two

main surfaces

10a and 10b, and the light of the light source 8 may exit from the third side surface 10e and the fourth side surface 10 f.

The light diffusing material 11 may be a metal oxide particle, for example, a titanium dioxide particle having an average particle diameter of, for example, 150 to 500nm, preferably 160 to 450nm, more preferably 170 to 450nm, further steps of preferably 200 to 400nm, and particularly preferably 220 to 400nm, and the content of the light diffusing material 11 is, for example, 0.1 to 100 mass ppm, preferably 0.1 to 50 mass ppm, and more preferably 0.1 to 10 mass ppm, based on the entire mass of the plate-shaped light guiding member 10.

The rutile phase transformation ratio of the titanium dioxide particles is, for example, 50 mass% or more, preferably 60 mass% or more, more preferably 70 mass% or more, and further step preferably 90 mass% or more, and the plate-like light-guiding member 10 may contain other monomers copolymerizable with the main monomer of the resin used, and additives such as antistatic agents, antioxidants, mold release agents, flame retardants, lubricants, fluidity improvers, fillers, light stabilizers, and -like additives.

When the material constituting the plate-shaped light guide member 10 is measured as a flat plate having a plate thickness of 4mm, the haze value in at least a part of the plate thickness direction is greater than 7% and not more than 30%, and when the material constituting the plate-shaped light guide member 10 is measured as a flat plate having a plate thickness of 4mm, the transmittance of visible light in at least a part of the plate thickness direction (the ratio of the amount of light emitted in all directions from the main surface on the other side to the amount of light incident from the main surface along the normal direction of the main surface on the side) is 60% to 92%.

The haze value of the plate-shaped light-guiding member 10 can be measured in accordance with JIS K7136 using a haze meter HZ-2 (manufactured by Suga tester). The visible light transmittance of the plate-like light guide member 10 can be measured by using a haze meter HZ-2 (manufactured by Suga testing machine Co., Ltd.) in accordance with JIS K7361-1.

In addition, a flat plate material made of a material constituting the plate-shaped light guide member 10 (hereinafter, for convenience, this flat plate material is referred to as a plate-shaped light guide member 10) satisfies the following conditions in terms of emission efficiency when light entering from a side surface connecting two main surfaces is emitted from the main surfaces. Fig. 3(a) and 3(B) are schematic diagrams for explaining a method of measuring the light emission efficiency of the plate-shaped light guide member. Fig. 3(a) shows the size of the plate-shaped light-guiding member 10 and the arrangement of the LEDs. Fig. 3(B) shows a case where the plate-shaped light guide member 10 to which the fixing frame B is attached is viewed from the light exit surface C side.

As shown in fig. 3(a), a plate-like light guide member 10 having a rectangular parallelepiped shape with a vertical length of 100mm, a horizontal length of 190mm, and a thickness of 3.2mm was prepared. The side surface a of the plate-like light guide member 10 is used as an incident surface of light source light. Further, the LEDs are arranged along the normal direction of the side surface a. The LED was arranged with the focal point P facing the side A and the distance from the focal point P to the side A was 1.85 mm. The light is diffused in the range of 180 ° from the light emitting surface of the LED.

As shown in fig. 3(B), the periphery of the prepared plate-like light guide member 10 is covered with a fixing frame B. In a state of being covered with the fixed frame BThe length of the light emitting surface C of the plate-like light guide member 10 in the vertical direction is 90mm, and the length in the horizontal direction is 160 mm. Neither the front nor the back of the fixed frame B reflects light. Further, the distance from the light exit surface C in the normal direction of the light exit surface C

A light receiving surface (not shown) is disposed at a distance of (a).

In this state, light is emitted from the LED. The light flux of light in a rectangular region of 15 ° up and down × 25 ° left and right irradiated onto the light receiving surface is measured with the intersection of the normal line passing through the center of the light emitting surface C and the light receiving surface as the center. In the case of the plate-shaped light guide member 10, when the luminous flux of light emitted from the LED is 1, the luminous flux of light irradiated to the rectangular region is 0.3% or more.

The plate-like light guide member 10 has optical characteristics that when light enters from the side surface, the amount of light emitted per unit area from the main surface is larger than the amount of light emitted per unit area from the side surface opposite to the side surface on which the light enters, and when light enters from the main surface at position , the amount of light emitted per unit area from the main surface at position is larger than the amount of light emitted per unit area from the side surface.

That is, the plate-shaped light guide member 10 has a higher ratio of light emitted from the main surface than that of light emitted from the side surface at of the case where light enters from the side surface and the case where light enters from the main surface, wherein the plate-shaped light guide member 10 also emits a predetermined amount of light from the side surface, and therefore, when any side surfaces are used as light incident surfaces, both main surfaces and the other side surfaces of the plate-shaped light guide member 10 are visually recognized as light emitting portions.

As shown in fig. 1, the light source 8 and the plate-like light guide member 10 are fixed to the lamp body 2 via a bracket 12. The bracket 12 is made of a thermally conductive material such as aluminum.

The vehicle lamp 1 can function as, for example, a turn signal lamp, a position light, a daytime running light, and the like by emitting light from the plate-shaped light guide member 10. Further, the vehicle lamp 1 may be disposed behind the vehicle. In this case, the vehicle lamp 1 can function as a turn signal lamp, a position light, a daytime running lamp, and the like, as well as a stop lamp, a tail lamp, and the like, by emitting light from the plate-shaped light guide member 10.

The plate-shaped light guide member 10 has high transparency, and the plate-shaped light guide member 10 is transparent, and can uniformly emit light entering from the second side surface 10d from the st main surface 10a and the second main surface 10b, and light is also emitted from at least the nd side surface 10c, that is, the plate-shaped light guide member 10 appears transparent when the light source 8 is not lit, and the plate-shaped light guide member 10 appears light when the light source 8 is lit, in other .

(mold)

Next, a mold for molding the plate-like light guide member 10 as a resin component will be described. Fig. 4(a) is a sectional view of the mold according to the embodiment. Fig. 4(B) is a sectional view taken along line a-a of fig. 4 (a). The mold 100 forms a molding space (cavity) 102 corresponding to the plate-shaped light guide member 10 as a resin part by a plurality of molds.

The mold 100 includes an th mold 104, a second mold 106, and a gate mold 108. the th mold 104 of the present embodiment is a fixed mold, the second mold 106 is a movable mold, and the th mold 104 has a concave portion 110 corresponding to the shape of the plate-like light guide member 10.

Among the side surfaces of the recess 110, the th surface 112 corresponds to the th side surface 10c of the plate-shaped light-guiding member 10, the second surface 114, which is the bottom surface of the recess 110, corresponds to the th main surface 10a of the plate-shaped light-guiding member 10, the fourth surface 116, which faces the th surface 112 of the recess 110, corresponds to the second side surface 10d of the plate-shaped light-guiding member 10, and the fifth surface 118 and the sixth surface 120, which are two side surfaces connecting the th surface 112 and the fourth surface 116, correspond to the third side surface 10e and the fourth side surface 10f of the plate-shaped light-guiding member 10, respectively.

The second mold 106 has a third surface 122 that closes the opening of the concave portion 110, the third surface 122 corresponds to the second main surface 10b of the plate-shaped light guide member 10, the gate mold 108 has a gate 124 for injecting the molten resin into the molding space 102, the gate 124 is connected to the -th surface 112 of the concave portion 110, and the gate 124 is an outlet of the resin flow path 109 of the gate mold 108, in other words, a boundary surface between the resin flow path 109 and the -th surface 112.

The dimension 124H of the gate 124 in the direction X2 in which the second surface 114 and the third surface 122 are aligned is half or less, more preferably or less of the dimension 112H in the direction X2 in the region 112R of the -th surface 112 in which the gate 124 extends, and the gate 124 is disposed so as to contact the boundary between the -th surface 112 and the third surface 122.

The gate 124 has a belt-like shape and extends parallel to the second surface 114 and the third surface 122, and therefore the width of the gate 124 is equal to or less than half of the distance between the second surface 114 and the third surface 122, in other words, equal to or less than half, more preferably equal to or less than third of the thickness of the molding space 102, the width (dimension 124H) of the gate 124 is, for example, 0.3mm to 0.5mm, and the length (dimension in the direction parallel to the second surface 114) of the gate 124 is, for example, 10mm to 100 mm.

(method for producing resin Member)

Next, a method of manufacturing a resin member using the mold 100 will be described, and fig. 5(a), 5(B), and 5(C) are views schematically showing a manufacturing process of the resin member, first, as shown in fig. 5(a), the th mold 104, the second mold 106, and the gate mold 108 are closed, and a resin injection nozzle, not shown, is connected to the resin flow path 109.

Then, the molten resin 16 is injected from the gate 124 into the molding space 102 at a predetermined injection pressure while the mold 100 is kept at a predetermined temperature. Thereby, the molten resin 16 is gradually filled in the molding space 204. The molten resin 16 is a transparent resin containing the light diffusing material 11 (see fig. 1). The resin is injected in a state heated to a predetermined melting temperature.

Then, as shown in FIG. 5B, the molten resin 16 is spread over the corners of the molding space 102, the molding space 102 is filled with the molten resin 16, and after a predetermined time has elapsed, the mold 100 is opened, and gate cutting is performed by a conventionally known means such as pincer, hot pincer, scissors, guillotine cutter, laser, and hand breaking, whereby a plate-like light guide member 10 having gate marks 14 with a large width and an extremely thin wall on the th side surface 10C is obtained as shown in FIG. 5C.

As described above, the mold 100 according to the present embodiment forms the molding space 102 corresponding to the plate-shaped light guide member 10 having the th main surface 10a and the second main surface 10b facing away from each other and a plurality of side surfaces, the mold 100 includes the th surface 112 corresponding to the th side surface 10c of the plate-shaped light guide member 10, the second surface 114 corresponding to the th main surface 10a, the third surface 122 corresponding to the second main surface 10b, and the gate 124 connected to the th surface 112, and the dimension 124H of the gate 124 in the direction X2 in which the second surface 114 and the third surface 122 are aligned is half or less of the dimension 112H in the direction X2 of the th surface 112.

When a plate-like light guide member for the purpose of irradiating light from a main surface is molded, it is needless to say that a direct gate method in which gate marks remain on the main surface cannot be employed. This is because the gate mark causes emission unevenness and prevents uniform surface emission from the main surface. Therefore, a side gate method is adopted in which gate marks remain on the side surface of the plate-shaped light guide member. However, the gate mark of the plate-shaped light guide member obtained by the conventional side gate type injection molding has a thickness approximately equal to the side surface of the plate-shaped light guide member.

Therefore, when light is to be emitted not only from the main surface but also from the side surface of the plate-like light guide member, large light emission unevenness due to the gate mark occurs in the side surface having the gate mark. Further, when the side surface having the gate mark is used as the light incident surface, the gate mark may block the incident light and reduce the amount of incident light to the plate-like light guide member.

In contrast, in the mold 100 of the present embodiment, the gate 124 is connected to the -th surface 112 corresponding to the -th side surface 10c of the plate-shaped light guide member 10, and the thickness of the gate 124 is equal to or less than half of the of the thickness of the -th surface 112. therefore, in the plate-shaped light guide member 10 obtained using the mold 100, the dimension 14H in the direction X1 in which the two

main surfaces

10a and 10b are aligned of the gate mark 14 remaining on the -th side surface 10c is formed to be equal to or less than half of the dimension H in the direction X1 of the -th side surface 10c, and the plate-shaped light guide member 10 causes the light incident from the second side surface 10d to be emitted from the -th side surface 10c and the two main surfaces.

Accordingly, the emission unevenness due to the gate mark 14 in the th side surface 10c can be reduced, and thus, the emission unevenness in the th side surface 10c can be made inconspicuous, and therefore, the surface emission can be uniformized in the two

main surfaces

10a and 10b and the th side surface 10c, and therefore, the plate-shaped light guide member 10 suitable for use in a mode of emitting light from the main surfaces and the side surfaces can be obtained according to the mold 100 of the present embodiment.

In the present embodiment, light enters from the second side surface 10d, but light may enter from the third side surface 10e and the fourth side surface 10f, and further exit from the th side surface 10c and the

main surfaces

10a and 10b, light may enter from the th side surface 10c, and further exit from any of the side surfaces and the

main surfaces

10a and 10b of the second side surface 10d to the fourth side surface 10f, in which case, it is possible to suppress the entrance of light from being obstructed by the gate mark 14, and thus, it is possible to improve the light use efficiency, and light may exit from the main surfaces only at the side of the th main surface 10a and the second main surface 10 b.

That is, the resin member formed using the mold 100 is the plate-shaped light guide member 10 including the light diffusing material 11, and reflecting the light entering from the side surface of out of the th side surface 10c and the side surface different from the th side surface 10c by the light diffusing material 11, and further emitting the light from the other side surface and at least the main surface of side, and by mounting such a plate-shaped light guide member 10 in the vehicle lamp 1, the design and the appearance of the vehicle lamp 1 can be improved.

Further, the gate 124 of the present embodiment is in contact with the boundary between the th surface 112 and the third surface 122, and therefore, the gate mark 14 of the plate-shaped light guide member 10 is in contact with the boundary between the th side surface 10c and the second main surface 10b, whereby the emission unevenness due to the gate mark 14 can be made less conspicuous, or more light can be made incident on the plate-shaped light guide member 10 from the th side surface 10c, and further, the gate 124 can be in contact with the boundary between the th surface 112 and the second surface 114, and the gate mark 14 can be in contact with the boundary between the th side surface 10c and the th main surface 10 a.

The embodiments of the present invention have been described in detail above. The above embodiments are merely specific examples in carrying out the present invention. The contents of the embodiments do not limit the technical scope of the present invention, and various design changes such as changes, additions, deletions, and the like of the constituent elements can be made within the scope not departing from the spirit of the invention defined by the claims. The new embodiment to which the design change is applied has both the combined effects of the embodiment and the modification. In the above-described embodiment, the expressions "in the present embodiment", "in the present embodiment" and the like are given to the contents in which the above-described design change is possible, and the emphasis is placed on the contents, but the design change is also allowed in the contents in which the expression is not given. Any combination of the above-described constituent elements is also effective as an aspect of the present invention. The hatching shown in the cross section of the drawing does not limit the material of the object marked with the hatching.

In the embodiment, the concave portion 110 is provided in the th die 104 as the fixed die, but the concave portion 110 may be provided in the second die 106 as the movable die, and the plate-like light guide member 10 of the embodiment has a flat shape, but may have a curved shape.

Claims

Mold of kinds for forming a molding space corresponding to a plate-like resin member having two main surfaces facing away from each other and a plurality of side surfaces connecting the two main surfaces,

the mold has:

a th face corresponding to the th one of the side faces;

a second face corresponding to the th main surface, and a third face corresponding to the second main surface, and

a gate connected to the th surface for injecting molten resin into the molding space,

the dimension of the gate in the direction in which the second surface and the third surface are arranged is half or less of the dimension of the -th surface in the direction in a region in which the gate extends.
2. The mold of claim 1, wherein the gate meets a boundary of the th face and the second face or a boundary of the th face and the third face.
3. The mold according to claim 1 or 2, wherein the resin member is a light guide member containing a light diffusing material, and the light diffusing material reflects light entering from a side surface of out of the th side surface and a side surface different from the th side surface and causes light to exit from the other side surface and the main surface of at least side.
4. The mold according to claim 1 or 2, wherein a dimension of the gate in a direction in which the second face and the third face are arranged is or less of a dimension of the th face in the direction in a region in which the gate extends.
5. The mold according to claim 3, wherein the light diffusing material is metal oxide particles having an average particle diameter of 150nm to 500 nm.
kinds of resin members which are plate-like resin members having two main surfaces facing away from each other and a plurality of side surfaces connecting the two main surfaces,

the resin part has a gate mark on an th one of the side faces,

a dimension of the gate mark in a direction in which both the main surfaces are aligned is half or less of a dimension of the th side surface in the direction in a region in which the gate mark extends.
7. The resin component according to claim 6, wherein the gate mark is continuous with a boundary of the -th side face and the main surface at side.
8. The resin part according to claim 6 or 7, wherein the resin part is a light guide member which contains a light diffusing material and reflects light entering from a side surface of out of the th side surface and a side surface different from the th side surface by the light diffusing material and causes light to exit from the other side surface and the main surface of at least side surface.
9. The resin component according to claim 6 or 7, wherein a dimension of the gate mark in a direction in which both the main surfaces are aligned is or less of a dimension of the th side surface in the direction in a region in which the gate mark extends.
10. The resin member according to claim 8, wherein the light diffusing material is metal oxide particles having an average particle diameter of 150nm to 500 nm.