JPH09309156A - Molding of optical part, molding die and optical part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the face accuracy from becoming deteriorated even when molding an optical part with a recessed face by cooling a die member for cooling one end face earlier than a mold member for forming the other end face. SOLUTION: When a molten resin is cooled to contract in a cavity C, a part which becomes a convex lens face is contracted in such a manner that the curvature radius is small without any restrictions. In addition, a part which becomes a concave lens, bites on the optical molding face 25 of a fixed side molding piece 23L protruding against the cavity C, when the part is contracted to reduce the curvature radius. However, the concave lens face part is earlier cooled to contract and bite on the optical molding face 25. Later when the convex lens face part set in a movable side high temperature molding die is belatedly cooled, the opposite side concave lens part is pulled away from the optical molding face 25 of the fixed side molding piece 23L. Thus it is possible to prevent the accuracy of the convex lens face side from becoming deteriorated as the biting of the resin on the optical molding face 25 is weak.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for molding an optical component having a concave optical surface on one end surface, a molding die, and an optical component molded by the molding die.

[0002]

2. Description of the Related Art Conventionally, optical parts have been manufactured by a polishing method regardless of the type of parts such as lenses, mirrors, or prisms, but recently, from the viewpoint of productivity and easy production of aspherical shapes, A manufacturing method of molding using has been used. Plastic, glass, etc. are generally used as the material of the optical component, but recently, there is an example in which a low melting point metal is used in the molding of a mirror or the like.

As an example, a case of molding a meniscus-shaped (one end surface is concave and the other end surface is convex) plastic lens L will be described.

FIG. 2 is a view showing the shape of the plastic lens L.

In FIG. 2, 1 is a convex lens surface, 2 is a concave lens surface, and 3 is a brim portion. The plastic lens L is a meniscus lens having an outer diameter of 40 mm (effective diameter of 30 mm) and a central portion having a wall thickness of 4 mm, and is made of acrylic resin.

FIG. 10 is a view showing the structure of a mold used when molding such a plastic lens L. As shown in FIG.

A fixed piece plate 102L on which a sprue 101 for supplying a molten resin material is formed is integrally attached to a piece holder 104L for holding a forming piece 103L. An optical molding surface 105 for molding the concave lens surface 2 is formed. A fixed-side mold is constituted by mold members such as the fixed mold plate 102L, the molding piece 103L, and the piece holder 104L. On the other hand, the movable mold plate 1 facing the fixed mold plate 102L
02M includes a piece holder 104 for holding the forming piece 103M.
M is integrally attached, and an optical molding surface 106 for molding the convex lens surface 1 is formed on the molding piece 103M. Then, the movable mold is constituted by the molding members such as the movable mold plate 102M, the molding piece 103M, and the piece holder 104M, and the molding pieces 103L and 103M and the piece holders 104L and 104 of the fixed and movable molds are formed.
With M, a cavity C corresponding to the plastic lens L is formed.

Fixed mold plate 102L and piece holder 104L
Between the movable mold plate 102M and the piece holder 104M, a runner 107 and a gate 108 that communicate with the cavity C from the sprue 101 are formed.
7 through gate 108 and cavity C through sprue 1
It is designed to communicate with 01. A plurality of ejector pins 109 are attached to the movable mold plate 102M so as to project into the cavity C, the plurality of ejector pins 109 penetrating the frame holder 104M and having their ends facing the portion of the cavity C corresponding to the flange 3 of the plastic lens L. , Similarly, this movable template 10
An ejector pin 110, which penetrates 2M and has its tip facing the sprue lock 111, is also attached so as to be able to project.

Further, the fixed side piece holder 104L and the movable side piece holder 104M respectively have a groove 1 through which a temperature control medium flows.
12L and 112M are provided in an annular shape and are sealed with an O-ring 114. Grooves 112L and 112M
A temperature control medium such as water, oil or ethylene glycol is made to flow from the mold temperature controller 113, and is monitored by temperature sensors 115L and 115M provided in the molding pieces 103L and 103M.

That is, as shown in FIG.
While the temperature control medium is flowing through L and 112M, the movable mold is driven toward the fixed mold to bring the fixed mold plate 102L and the movable mold plate 102M into contact with each other and to eject the ejector pin 10.
With the 9,110 retracted, the molten resin is injected from the sprue 101 into the cavity C through the runner 107 and gate 108, cooled and solidified, and then moved so as to separate the movable side mold from the fixed side mold. Then movable template 102M
Is separated from the fixed mold plate 102L, and then the ejector pins 109 and 110 are fixed to the fixed mold plate 102L and the piece holder 10.
The plastic lens L injection-molded from the frame holder 104M is projected to the 4L side, and the runner 107 and the gate 10
It is removed together with the part corresponding to 8.

At this time, the fixed mold plate 112L and the movable mold plate 1
A temperature control medium having the same temperature was supplied to 12M so that the entire mold was in a uniform temperature state. In this acrylic resin molding, a temperature control medium of water or oil at 90 ° C. is poured from the mold temperature controller 113 to the fixed mold plate 112L and the movable mold plate 112M so that the entire mold becomes uniform at 90 ° C. It was

[0012]

However, even if an optical component having such a concave lens surface is molded by the above-described molding method, the accuracy of the concave lens surface is not good.

When the concave surfaces of the biconcave lenses have different curvatures, the concave lens surface having a large radius of curvature causes no problem, but the concave lens surface having a small radius of curvature also tends to reduce accuracy.

This is a tendency to be found in all optical parts molded by using a mold, and the same is true whether the material of the optical parts is plastic, glass or low melting point metal. . Here, the result of measuring the lens surface accuracy of the convex lens surface 1 and the concave lens surface 2 of the plastic lens L molded by the above-described molding method using the mold shown in FIG. Is shown in FIGS. 11 and 12.

As is clear from these figures, the accuracy of the lens surface on the convex lens surface 1 side shown in FIG. 11 in which the interference fringes are arranged substantially in parallel is in a relatively good state, but FIG.
It can be seen that the number of interference fringes is very large on the concave lens surface 2 side shown in (3), and the desired lens surface accuracy is not obtained.

The cause is that the heat of the molten resin injected into the cavity C shown in FIG.
Although the resin in the cavity C is cooled and contracted by being deprived of the temperature control medium flowing through 13, the portion of the resin that becomes the convex lens surface 1 is the optical molding surface 106 of the molding piece 103M that is retracted with respect to the cavity C. Although the resin can be contracted so that its radius of curvature is reduced without any constraint, the portion of the resin that becomes the concave lens surface 2 is projected to the cavity C when contracted so that its radius of curvature is reduced. Optical molding surface 10 of the molding piece 103L in the state
As a result, the movable side mold is separated from the fixed side mold to form the plastic lens L on the molding piece 103.
L, 103M and the piece holders 104L, 104M, when the resin that had been bitten by the molding piece 103L was forcibly removed, the concave lens surface 2 was distorted, and as shown in FIG. It is considered that the surface accuracy will deteriorate.

Therefore, the present invention has been made in view of the above-mentioned problems, and a main object thereof is a molding method of an optical component capable of preventing deterioration of surface accuracy even when molding an optical component having a concave surface. And to provide a mold.

Another object of the present invention is to provide an optical component molded by the above molding method and mold.

[0019]

In order to solve the above-mentioned problems and achieve the object, a method of molding an optical component according to the present invention has a concave optical surface on at least one end surface and a concave optical surface on the other end surface. A molding method of an optical component for molding an optical component having a concave surface or a concave surface having a larger radius of curvature than the concave surface of the one end surface by injection molding of a resin material, the method for forming the one end surface It is characterized in that the mold member is cooled before the mold member forming the other end surface.

Further, in the method of molding an optical component according to the present invention, the other end surface is an optical surface.

Further, the optical component according to the present invention has a concave optical surface on at least one end surface and a non-concave surface on the other end surface or a concave surface having a larger radius of curvature than the concave surface on the one end surface. An optical component formed by injection molding of a resin material, the optical component being formed by cooling the mold member for forming the one end surface before cooling the mold member for forming the other end surface. I am trying.

Further, the optical component according to the present invention is characterized in that the other end surface is an optical surface.

Further, the optical component according to the present invention is characterized in that the optical component is a lens.

Further, the molding die according to the present invention has a concave optical surface on at least one end surface and a non-concave surface on the other end surface or a concave surface having a larger radius of curvature than the concave surface on the one end surface. A molding die for molding an optical component formed by injection molding of a resin material, the first die member for molding the one end surface, and the second die for molding the other end surface It is characterized by comprising a member and temperature control means for separately controlling the temperature of the first mold member and the second mold member.

Further, in the molding die according to the present invention,
It is characterized in that an optical component in which the other end surface is an optical surface is molded.

Further, in the molding die according to the present invention,
The temperature control means controls the first mold member and the second mold member at different temperatures.

Further, in the molding die according to the present invention,
A heat insulating member is provided between the first mold member and the second mold member.

In the above structure, the molding piece for forming the concave optical surface of the one end surface is cooled before the other mold member forming the other end surface, so that the concave portion at that time becomes the cavity. On the other hand, it contracts so as to bite the optical molding surface of the projecting piece that is in a protruding state, and the optical parts are bent to the side that becomes the concave surface, but then the other end surface side shrinks as the other end surface side cools. However, as a result, the entire optical component bends again in the direction in which the biting of the concave portion of the one end surface with respect to the optical molding surface of the molding piece weakens again. The deterioration of the surface accuracy of the concave surface is alleviated,
Optical parts with excellent surface accuracy can be molded.

[0029]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

(First Embodiment) A first embodiment of the present invention will be described below.

FIG. 1 is a diagram showing the structure of a resin molding die according to the first embodiment, which is capable of injection-molding the meniscus-shaped plastic lens L shown in FIG. That is, a fixed side piece holder 24L for holding a fixed side molding piece 23L is integrally attached to a fixed side mold plate 22L on which a sprue 21 for supplying a molten resin material is formed. An optical molding surface 25 for molding the concave lens surface 2 is formed on the molding piece 23L. The fixed side mold plate 22L, the fixed side molding piece 23L, and the fixed side piece holder 24L constitute a fixed side mold. On the other hand, on the movable side mold plate 22M facing the fixed side mold plate 22L, a movable side mold holder 24M holding a movable side molding piece 23M is integrally attached, and the movable side molding piece 23M has a convex lens surface. The optical molding surface 26 for molding 1 is formed, and the movable side piece holder 24
M has an annular molding surface 27 for molding the brim portion 3.
Are formed. Then, these movable side template 22M,
The movable side mold is constituted by mold members such as the movable side molding piece 23M and the movable side piece holder 24M, and the fixed side mold and the movable side mold forming pieces 23L and 23M, the fixed side piece holder 24L and the movable side piece. A cavity C corresponding to the plastic lens L is formed with the holder 24M.

Fixed side template 22L and fixed side piece holder 24
A runner 28 and a gate 29 that communicate with the sprue 21 and the cavity C are formed between L and the movable-side mold plate 22M and the movable-side piece holder 24M, and the cavity C is formed through the runner 28 and the gate 29. It is designed to communicate with the sprue 21. A plurality of ejector pins 30 are attached to the movable side mold plate 22M so as to project into the cavity C, the plurality of ejector pins 30 penetrating the movable side piece holder 24M and having a tip facing a portion of the cavity C corresponding to the brim portion 3 of the plastic lens L. Similarly, the ejector pin 31 that penetrates the movable side mold plate 22M and has its tip facing the sprue lock 34 is also attached so as to be able to project.

Further, the fixed side piece holder 24L and the movable side piece holder 24M respectively have grooves 32 through which the temperature control medium flows.
L and 32M are provided in a ring shape and are sealed by an O ring 33. Temperature control media such as water and oil are made to flow independently from the mold temperature controllers 35 and 36 into the grooves 32L and 32M, and the temperature sensors 37 provided in the molding pieces 23L and 23M are provided.
Monitor with L and 37M or temperature sensor 37L and 3
The mold temperature controllers 35 and 36 are controlled by utilizing the temperature detected at 7M.

Further, a heat insulating plate 38 is provided at the boundary between the fixed-side mold and the movable-side mold, that is, at the parting surface so that heat of the fixed-side mold and heat of the movable-side mold do not come and go. There is.

That is, as shown in FIG. 1, the movable side mold is driven toward the fixed side mold while the temperature control medium is being flowed from the mold temperature controllers 35 and 36 into the grooves 32L and 32M. Then, the fixed-side mold plate 22L and the movable-side mold plate 22M are brought into contact with each other, and the ejector pins 30 and 31 are retracted,
Molten resin is runner 28 and gate 29 from sprue 21.
After being injected into the cavity C through the, and cooled and solidified, the movable side mold 22M is separated from the fixed side mold plate 22L by moving so as to separate the movable side mold from the fixed side mold,
After that, the ejector pins 30 and 31 are projected toward the fixed-side mold plate 22L and the fixed-side piece holder L side, and the ejector pin 30 is abutted against the protruding portion 3 to move the movable-side piece holder 2
The plastic lens L injection-molded from 4L is removed together with the runner 28 and the portion corresponding to the gate 29.

At this time, in this embodiment, the fixed mold temperature controller 35 sets the temperature of the temperature control medium to 85 ° C., and the movable mold temperature controller 36 sets the temperature of the temperature control medium to 95 ° C. It was set to ° C. The material of the plastic lens L is acrylic resin as described above.

When the molten resin cools and shrinks in the cavity C, the portion of the resin which becomes the convex lens surface 1 is the cavity C.
With respect to the movable molding piece 23M in the retracted state, the optical molding surface 26 of the movable molding piece 23M can be contracted so that its radius of curvature is reduced without any constraint. Also, when the concave lens surface 2 of the resin contracts so that its radius of curvature becomes small, it becomes in a state of biting on the optical molding surface 25 of the fixed-side molding piece 23L protruding from the cavity C.

However, in the present embodiment, since the temperature of the fixed side mold is lower, the portion which becomes the concave lens surface 2 is cooled and contracted first, and bites on the optical molding surface 25 of the fixed side molding piece 23L. However, when the portion which becomes the convex lens surface 1 provided in the movable mold having a high temperature thereafter cools with a delay, the portion which becomes the concave lens surface 2 on the opposite side from the optical molding surface 25 of the fixed molding piece 23L. Since they are separated from each other, the biting is weakened, so that the accuracy deterioration on the concave lens surface 2 side can be suppressed as compared with the conventional one shown in FIG.

Here, regarding the lens surface precision of the convex lens surface 1 and the concave lens surface 2 when the plastic lens L shown in FIG. 2 is injection-molded using the resin molding die of this embodiment described above, a laser interference device is used. The results of the measurement using are shown in FIGS. 3 and 4. As you can see from these figures,
The lens surface accuracy on the convex lens surface 1 side shown in FIG. 3 is almost the same as that of the conventional one shown in FIG. 11, and the concave lens surface 2 side shown in FIG. It can be seen that the number of interference fringes is significantly smaller than that of No. 1, and good lens surface accuracy can be obtained.

In the above-mentioned embodiment, the meniscus lens is targeted, but it is also possible to apply it to a plano-concave lens. Such a sectional structure of another embodiment of the present invention is shown in FIG.
Shown in

In the lens L1 of FIG. 5, one end surface is a concave optical surface 2 and the other end surface is a flat surface 4. Even in this case, the molding may be performed such that the mold member on the side having the molding piece forming the concave optical surface 2 is cooled first, and the side having the mold member forming the plane 4 is cooled later.

The biconcave lens can also be applied when the concave surfaces have different curvatures, and FIG. 6 shows a sectional structure of another embodiment of the present invention. In the lens L2 of FIG. 6, one end surface is a concave optical surface 2, and the other end surface is a concave optical surface 5 having a larger radius of curvature than the optical surface 2.
Even in this case, the mold member on the side having the molding piece forming the concave optical surface 2 with a large curvature to the molding piece and a small radius of curvature is first cooled, and the curvature radius with a relatively small curvature to the molding piece is relatively small. The mold member on the side having the molding piece forming the large concave optical surface 5 may be molded so as to be cooled with a delay.
Further, although the lens surface having a circular shape has been described above, the same applies to a toric lens or a cylindrical lens having a rectangular lens surface.

FIG. 7 is a diagram of a toric lens according to another embodiment.

In the lens L3 of FIG. 7, one end surface is a concave optical surface 2 and the other end surface is a convex optical surface 1. Even in this case, the mold member on the side having the molding piece forming the concave optical surface 2 is cooled first, and the mold member on the side having the molding piece forming the convex optical surface 1 is cooled later. It may be molded in the same manner.

The lens surface of the toric lens has a curvature in the longitudinal direction and a curvature in the lateral direction. In Figure 7,
Although an example of a toric lens having the same unevenness in the longitudinal direction and the lateral direction is shown, FIG. 8 shows another embodiment of the toric lens. In the lens L4 of FIG. 8, the optical surface 6
Is concave in the longitudinal direction but convex in the lateral direction, and the optical surface 7 is convex in the longitudinal direction but concave in the lateral direction. In such a case, the forming method may be considered in consideration of which of the longitudinal direction and the lateral direction has the higher required accuracy. In this embodiment, since accuracy in the lateral direction is more important, the mold member on the side having the molding piece forming the surface 7 having the concave optical surface in the lateral direction precedes the mold member. Then, the mold member on the side having the molding piece forming the surface 6 having the convex optical surface in the lateral direction is cooled with a delay.

The materials of all the above lenses may be plastic or glass. Not only the lens but also a reflecting mirror can be used. In this case, the concave lens surface 2 shown in FIG. 5 may be a surface mirror having a reflection film formed thereon, or the convex lens surface 1 shown in FIG. A film can be formed and used as a back mirror. When it is used as a surface mirror, it is not necessary to form the opposite end face as the optical plane 4.

It is also possible to use a low melting point metal to form a reflecting mirror as shown in FIG. 5 without forming a reflecting mirror, and if one end surface is a concave optical surface as a whole, the other end surface is As long as it is not a concave surface having a radius of curvature smaller than the one end surface, it may be a convex surface or a flat surface,
The concave surface may have a larger radius of curvature than the concave surface of the one end surface, or may have another shape. The concave optical surface includes not only an optical surface on a mirror surface but also a saw-toothed surface such as a Fresnel lens. Also,
Optical surfaces generally include transmissive and reflective surfaces.

By the way, as a method of cooling the one end surface on the concave surface side before the other end surface side, the molding piece for forming the concave optical surface is housed by using two mold temperature controllers. Although the method of setting the temperature of the temperature control medium flowing through the mold member being set lower than the temperature of the temperature control medium flowing through the other mold member forming the other end surface is shown as one embodiment, , The temperature of each mold member is controlled by a heater instead of a medium such as water or oil, and the set temperature is made different, or even when the same temperature control medium is flowed at the same temperature, the molds with different thermal conductivity By using a member (for example, copper alloy and ceramic) to make a difference in cooling rate, or by changing the type of temperature control medium (for example, water and oil), you can make a difference in cooling rate or adjust the temperature. Change the means (medium and heater),
The cooling rate can be made different by changing the distance of the temperature control means from the cavity. As another molding method, before the resin is injected into the mold, the mold temperature is raised above the glass transition temperature of the resin in advance, and then the mold temperature is slowly lowered while cooling the resin in the cavity. Then, there is a molding method (generally called a heat cycle molding method) of taking out from the mold, but in this case,
In FIG. 1, heaters (not shown) are embedded in the fixed side piece holder 24L and the movable side piece holder 24M in addition to the grooves 32L and 32M through which the temperature control medium flows, so that the mold temperature becomes equal to or higher than the glass transition temperature of the resin. When the temperature is raised, the heater is energized, and then the current is stopped from flowing to the groove 32L,
There is a method of cooling with a temperature control medium flowing through 32M.

In this embodiment, an acrylic resin is used, and the glass transition temperature of the acrylic resin is 115 ° C.

FIG. 9 shows how the mold temperature changes in this embodiment.

This graph in FIG. 9 shows the molding piece 23 shown in FIG.
Temperature sensors 37L and 37M inserted in L and 23M
It represents the change in the detected temperature of over time.
Of the two curves, the curve 8 is the molding piece 23 that forms a convex surface.
The temperature detected by the temperature sensor 37M inserted in M,
Curve 9 is the temperature detected by the temperature sensor 37L inserted in the molding piece 23L forming the concave optical surface.

As described above, the temperature control medium on the fixed side is 85 ° C.,
The temperature control medium on the movable side is at 95 ° C. Explaining the method of molding, 12
After the temperature was raised to 0 ° C. by a heater (portion I), and after the resin was injected into the cavity C, the mold temperature of each mold member approached the temperature of each temperature control medium, The resin is cooled (part II).

As shown in FIG. 9, the temperature of the curve 9 decreases faster, and the molding piece 23L forming the concave optical surface cools before the molding piece 23M forming the convex surface. I understand. If molded in this way, the surface accuracy of the concave surface 2 is as shown in FIG. 4, but the temperature of the fixed-side and movable-side temperature control media is adjusted to 9
If the fixed side and the movable side are cooled uniformly at 0 ° C., the surface accuracy of the concave surface 2 becomes as shown in FIG.

Although the temperature at the time of injection is the same on the fixed side and the movable side here, it is also useful to make a temperature difference.

The heat insulating plate 38 is useful when changing the cooling rates of the fixed-side mold member and the movable-side mold member in this manner, but the heat insulating member may be a member other than the heat insulating plate.

[0056]

As described above, according to the present invention,
A molding method using an optical component mold in which one end surface has a concave optical surface and the other end surface is not a concave surface or has a concave surface having a larger radius of curvature than the concave surface of the one end surface. By cooling the mold member that houses the molding piece for forming the optical surface before cooling the other mold member that forms the other end surface, it is possible to prevent the accuracy of the concave surface from deteriorating. Optical parts such as lenses and mirrors having excellent performance can be molded.

Further, in the mold, different temperature conditions are created by different temperature control means, or a heat insulating member is provided between different mold members to form a concave optical surface on one end surface. The mold member in which the molding piece is housed can be cooled earlier than the other mold members forming the other end surface, the accuracy of the concave surface can be suppressed from decreasing, and the lens has excellent optical performance. Optical components such as mirrors can be molded.

Furthermore, in order to create different temperature states, a mold member for accommodating a molding piece for forming a concave optical surface on one end surface is provided by providing a temperature controller, It can be cooled earlier than the other mold member forming the end face, it is possible to suppress the accuracy decrease of the concave surface,
Optical parts such as lenses and mirrors having excellent optical performance can be molded.

[0059]

[Brief description of drawings]

1 is a cross-sectional view of one embodiment of a mold for molding a meniscus lens according to the present invention.

FIG. 2 is a diagram of the meniscus lens molded in FIG.

FIG. 3 is a diagram showing a state of an interference fringe representing the lens surface accuracy on the convex surface side of the meniscus lens shown in FIG.

FIG. 4 is a diagram showing a state of interference fringes representing the lens surface accuracy on the concave side of the meniscus lens shown in FIG.

FIG. 5 is a cross-sectional view showing the shape of another optical component.

FIG. 6 is a sectional view showing the shape of another optical component.

FIG. 7 is a perspective view showing the shape of still another optical component.

FIG. 8 is a perspective view showing the shape of still another optical component.

FIG. 9 is a diagram showing how the mold temperature of a mold changes.

FIG. 10 is a cross-sectional view showing an example of a conventional molding die.

FIG. 11 is a diagram showing the appearance of interference fringes representing the lens surface accuracy on the convex surface side of the meniscus lens shown in FIG. 2 when molded by a conventional molding method.

FIG. 12 is a diagram showing a state of interference fringes representing the lens surface accuracy on the concave surface side of the meniscus lens shown in FIG. 2 when molded by a conventional molding method.

[Explanation of symbols]

 1 Convex lens surface 2, 5 Concave lens surface 4 Plane 23L, 23M Molding piece 24L, 24M Piece holder 25, 26 Optical molding surface C Cavity L, L1, L2, L3, L4 Lens

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code Agency reference number FI Technical display location // B29L 11:00

Claims (9)

[Claims] 1. An optical component having at least one end surface having a concave optical surface and the other end surface having a non-concave surface or a concave surface having a larger radius of curvature than the concave surface of the one end surface is injection-molded of a resin material. A molding method of an optical component for molding by the method, wherein the mold member for forming the one end surface is cooled before the mold member for forming the other end surface. . 2. The method of molding an optical component according to claim 1, wherein the other end surface is an optical surface. 3. Molding by injection molding of a resin material, which has a concave optical surface on at least one end surface and has a non-concave surface on the other end surface or a concave surface having a larger radius of curvature than the concave surface on the one end surface. An optical component formed by cooling the mold member for forming the one end surface before cooling the mold member for forming the other end surface. 4. The optical component according to claim 3, wherein the other end surface is an optical surface. 5. The optical component according to claim 4, wherein the optical component is a lens. 6. Molding by injection molding of a resin material, which has a concave optical surface on at least one end surface and has a non-concave surface on the other end surface or a concave surface having a larger radius of curvature than the concave surface on the one end surface. And a first mold member for molding the one end face, a second mold member for molding the other end face, and the first mold. A molding die comprising: a member and a temperature adjusting means for separately controlling the temperature of the second mold member. 7. The molding die according to claim 6, wherein an optical component in which the other end surface is an optical surface is molded. 8. The mold according to claim 6, wherein the temperature adjusting means controls the first mold member and the second mold member at different temperatures. 9. The mold according to claim 6, wherein a heat insulating member is provided between the first mold member and the second mold member.