JP2008046469A - Method for manufacturing diffractive optical element and resin discharging apparatus - Google Patents

Abstract

The present invention relates to a method of manufacturing a diffractive optical element in which a resin layer that forms a diffraction grating is provided on an optical member, and a resin discharge apparatus, and can effectively prevent air bubbles from being mixed into a concavo-convex pattern of the diffractive optical element. At the same time, it aims to reduce the film thickness unevenness of the optical material resin.
A resin discharge step of discharging an uncured optical material resin to a ring-shaped uneven pattern formed on a mold, and pressing the optical member against the uncured optical material resin to A spreading step of spreading on the concavo-convex pattern, and a curing step of curing the optical material resin, wherein the ejection of the optical material resin in the resin ejection step is symmetrical with respect to the center of the ring-shaped concavo-convex pattern It is characterized by being performed at a position.
[Selection] FIG.

Description

  The present invention relates to a method for manufacturing a diffractive optical element in which an optical member is provided with a resin layer having a concavo-convex pattern, and a resin ejection device.

Conventionally, a diffractive optical element is known in which a lens member is provided with a resin layer forming an uneven pattern. Such a diffractive optical element, for example, discharges uncured optical material resin to one part of a member having a concavo-convex pattern and then spreads the uncured optical material resin over the entire concavo-convex pattern, and in this state the optical material Manufactured by curing resin.
Then, when the uncured optical material resin is spread over the entire concavo-convex pattern, the optical material resin is spread along the groove direction of the concavo-convex pattern so that bubbles are not mixed into the grooves of the concavo-convex pattern. .
Japanese Patent Laid-Open No. 2003-307608

  In the conventional manufacturing method, the optical material resin is discharged to one place of the concavo-convex pattern, and the optical material resin is spread in the groove direction of the concavo-convex pattern by the push plate, so the optical material resin is evenly distributed throughout the concavo-convex pattern. It is difficult to do. For this reason, there is a problem that the thickness of the resin layer on which the diffraction grating shape is formed tends to be non-uniform, and the optical performance of the completed optical element tends to vary.

  The present invention has been made to solve such a conventional problem, and can effectively prevent bubbles from being mixed into the concavo-convex pattern of the diffractive optical element and reduce the film thickness unevenness of the optical material resin. It is an object of the present invention to provide a method for manufacturing a diffractive optical element and a resin discharge device.

  According to a first aspect of the present invention, there is provided a method of manufacturing a diffractive optical element comprising: a resin discharge step of discharging an uncured optical material resin onto a ring-shaped uneven pattern formed on a mold; Pressing and spreading the optical material resin on the concavo-convex pattern, and a curing step for curing the optical material resin, and discharging the optical material resin in the resin discharging step It is characterized in that it is performed at a position that is symmetric with respect to the center of the uneven pattern.

  According to a second aspect of the present invention, there is provided a method of manufacturing a diffractive optical element comprising: a resin discharging step of discharging an uncured optical material resin onto a ring-shaped uneven pattern formed on a first optical member; and the uncured optical material resin A step of spreading and spreading the optical material resin on the concave-convex pattern by pressing a second optical member; and a curing step of curing the optical material resin, and discharging the optical material resin in the resin discharge step Is performed at a position that is symmetrical with respect to the center of the ring-shaped uneven pattern.

A method for manufacturing a diffractive optical element according to a third aspect of the invention is the method for manufacturing a diffractive optical element according to the first or second aspect, wherein the optical material resin is discharged in the resin discharge step with respect to the ring-shaped uneven pattern. It is characterized by being performed in a cross shape.
A method for manufacturing a diffractive optical element according to a fourth aspect of the present invention is the method for manufacturing a diffractive optical element according to any one of the first to third aspects, wherein the optical member is a lens member.

According to a fifth aspect of the present invention, there is provided a resin discharge device that discharges an uncured optical material resin to a ring-shaped uneven pattern formed on a molding die or an optical member, and the discharge unit has a diameter of the ring-shaped uneven pattern. And moving means for moving in the direction.
According to a sixth aspect of the present invention, there is provided the resin discharge device according to the fifth aspect, further comprising a control unit that controls the discharge amount of the optical material resin discharged by the discharge unit according to the position of the discharge unit. It is characterized by.

  In the present invention, it is possible to effectively prevent bubbles from being mixed into the concavo-convex pattern of the diffractive optical element, and to reduce the film thickness unevenness of the optical material resin.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 shows a multi-contact diffractive optical element that is a production target of the present invention.
The diffractive optical element includes a first lens member 11, a second lens member 12, a first resin layer 13, and a second resin layer 14.
The overall shape of the first lens member 11 is circular. The first resin layer 13 is in close contact with one surface side (the upper surface in FIG. 1) of the first lens member 11. The other surface (the lower surface in FIG. 1) of the first lens member 11 is processed into a spherical surface or an aspheric surface to form a lens surface.

  The second lens member 12 is formed in a circular shape having a larger diameter than the first lens member 11. One surface (the upper surface in FIG. 1) of the second lens member 12 is processed into a spherical surface or an aspheric surface to form a lens surface. The other surface (the lower surface in FIG. 1) of the second lens member 12 forms a bonding surface that faces the first lens member 11. The second resin layer 14 is in close contact with the joint surface.

  The first resin layer 13 and the second resin layer 14 are formed between the first lens member 11 and the second lens member 12. The first resin layer 13 and the second resin layer 14 are made of different ultraviolet curable optical material resins having different refractive indexes and different dispersion tendencies. On the boundary surface between the first resin layer 13 and the second resin layer 14, as shown in FIG. 2, a concentric circular ring-shaped uneven pattern 15 having an uneven shape that causes a desired diffraction phenomenon is formed. Yes. In addition, the 1st resin layer 13 and the 2nd resin layer 14 also play the role which bonds and integrates the 1st lens member 11 and the 2nd lens member 12. FIG.

FIG. 3 shows a manufacturing apparatus used for manufacturing the above-described diffractive optical element.
This manufacturing apparatus has a support base 17 on the side surface of the base 16. A molding unit 18 is disposed on the base 16. A discharge unit 19 and a chuck unit 20 are disposed on the support base 17.
The support base 17 has a vertical portion 17a and a horizontal portion 17b. An X stage 21 is disposed on the horizontal portion 17b. The X stage 21 is movable in the X direction (left-right direction) in FIG. On the X stage 21, Y and Z stages 23 are arranged via support members 22. The Y and Z stages 23 are movable in the Y direction (front-rear direction) and the Z direction (up-down direction) in FIG. The discharge unit 19 is fixed to the Y and Z stage 23. On the X stage 21, a chuck unit 20 is disposed at a distance from the discharge unit 19. The chuck unit 20 is fixed to the X stage 21 via a support member 24.

  As shown in FIG. 4, the discharge unit 19 has a cylinder 26 in the main body 25. An electric heater 27 for heating the ultraviolet curable resin 31 is disposed outside the cylinder 26. A nozzle portion 28 for discharging the ultraviolet curable resin 31 is formed at the tip of the cylinder 26. A piston 29 and a piston rod 30 are arranged in the cylinder 26. The driving of the piston rod 30 is controlled by a pulse motor (not shown), and the discharge amount of the ultraviolet curable resin 31 from the nozzle portion 28 can be controlled with high accuracy. An ultraviolet curable resin 31 can be supplied to the cylinder 26 from an ultraviolet curable resin 31 supply unit (not shown).

  As shown in FIG. 5, the chuck unit 20 has a cylinder 32. A chuck body 33 is disposed below the cylinder 32. An opening 33 a is formed at the lower end of the chuck body 33. An O-ring 34 is disposed in the opening 33a. A suction line 36 from a vacuum pump (shown in FIG. 1) 35 is connected to the cylinder 32. An ultraviolet light source 38 that irradiates ultraviolet rays 37 for curing the ultraviolet curable resin 31 is disposed on the cylinder 32.

  As shown in FIG. 6, the molding unit 18 is disposed in a hole 39 formed in the base 16. A movable pedestal 41 is disposed on the outer side above the hole 39. The movable pedestal 41 has an annular shape and can be moved in the Z direction (vertical direction) by an elevating mechanism 43 using a motor 42. A mold base 44 is arranged at the bottom of the hole 39. The mold table 44 has a columnar shape and can be moved in the Z direction (vertical direction) by an elevating mechanism 46 using a motor 45. A mold 47 is placed on the mold table 44. In this embodiment, two types of molding units 18A and 18B are used as will be described later.

  In FIG. 3, reference numeral 48 denotes a control unit. The control unit 48 drives and controls the X stage 21, Y, and Z stage 23 by programming control. Further, the discharge amount of the ultraviolet curable resin 31 from the discharge unit 19 is controlled according to the position of the discharge unit 19. Further, the ultraviolet light source 38 of the chuck unit 20 is turned on / off and the vacuum pump 35 is turned on / off. Further, as shown in FIG. 6, the control unit 48 drives and controls the motors 42 and 45 of the elevating mechanisms 43 and 46 of the movable base 41 and the mold base 44.

Hereinafter, a method for manufacturing a diffractive optical element using the above-described manufacturing apparatus will be described.
FIG. 7 is a flowchart showing the manufacturing method of this embodiment in the order of steps. In this manufacturing method, the process can be roughly divided into a first process from step S1 to step S6 and a second process from step S7 to step S12.
(First step)
In the first step, as shown in FIGS. 8 and 10, the first resin layer 13 is applied to the first lens member 11 using the first molding unit 18A having the mold 47A and the movable base 41A. Form.

Here, the configuration of the first molding unit 18A will be briefly described. As shown in FIG. 8A, the upper surface of the mold 47 </ b> A has a circular shape smaller than the outer diameter of the first lens member 11. In the shape transfer region on the upper surface of the mold 47A, a concentric circular ring-shaped uneven pattern 15 corresponding to the diffraction grating is formed.
On the other hand, the movable base 41A is disposed in the vicinity of the upper surface of the mold 47A. The movable pedestal 41A is formed in an annular shape surrounding the side surface of the mold 47A, and is configured to be slidable in the vertical direction with respect to the mold 47A. The inner diameter of the movable pedestal 41 </ b> A is set smaller than the outer edge of the first lens member 11. Therefore, the first lens member 11 can be placed on the upper surface of the movable base 41A.

Hereinafter, the contents of the first step will be sequentially described.
Step S1 (Discharging process): As shown in FIG. 8A, the control unit 48 controls the upper surface of the position of the movable base 41A to be higher than the position of the mold 47A. Further, the position of the nozzle portion 28 of the discharge unit 19 is controlled by controlling the X stage 21 and the Y and Z stages 23. Then, the ultraviolet curable resin 31A is discharged to the mold 47A of the first molding unit 18A.

  When the ultraviolet curable resin 31A is discharged onto the upper surface of the mold 47A, first, as shown in FIG. 8A, the process starts from the center of the mold 47A. After starting the discharge of the ultraviolet curable resin 31A, the control unit 48 stops the movement of the discharge unit 19 for a predetermined time. That is, since the ultraviolet curable resin 31A is viscous, in order to accurately control the discharge amount, the time from the start of discharge until the ultraviolet curable resin 31A comes into contact with the mold 47A, the upper center of the mold 47A (viscosity However, it is necessary to wait for 5 mm, for example. Since the standby time and the discharge height vary depending on the viscosity of the ultraviolet curable resin 31A, the time until the contact with the mold 47A and the discharge height are ascertained beforehand by a discharge experiment or the like, and programming control is performed by the control unit 48.

  After the ultraviolet curable resin 31A contacts the central portion of the mold 47A, the control unit 48 discharges the ultraviolet curable resin 31A in the outer peripheral direction of the mold 47A as shown in FIG. 8B. To move. Regarding the relationship between the viscosity of the ultraviolet curable resin 31A during movement and the bubble generation frequency, the lower the viscosity of the ultraviolet curable resin 31A, the faster the moving speed, and the movement becomes stable and bubbles are less likely to be generated. On the other hand, if the viscosity is too low, the ultraviolet curable resin 31A flows out, which is not desirable. Therefore, in order to reduce the generation of bubbles, the control unit 48 heats the ultraviolet curable resin 31A to a temperature at which an appropriate viscosity is obtained by the electric heater 27, and discharges the ultraviolet curable resin 31A in a state of being lowered to a predetermined viscosity.

  The control unit 48 moves the discharge unit 19 to the outer peripheral side in the −X direction of the mold 47A while discharging the ultraviolet curable resin 31A. After moving up to the specified distance in the outer peripheral side direction of the mold 47A, the discharging unit 19 is moved in the + direction opposite to the discharging direction while discharging the ultraviolet curable resin 31A, as shown in FIG. Then, the ultraviolet curable resin 31A is discharged to the center of the mold 47A. This operation is performed in the order of the X direction and the Y direction as shown in (d), (e), and (f) of FIG.

  In discharging in each direction, the control unit 48 causes the UV curable resin 31A to spread evenly with a predetermined thickness on the concave-convex pattern 15 of the mold 47A during a step S3 spreading process described later. The discharge amount of the ultraviolet curable resin 31A is accurately controlled. That is, in order to ensure the optical performance by setting the film thickness of the first resin layer 13 after molding to a predetermined value, it is necessary to accurately control the total discharge amount of the ultraviolet curable resin 31A. Further, in order to eliminate the film thickness unevenness of the first resin layer 13 after molding and ensure the optical performance, the total discharge amounts in the ± X and ± Y directions are constant, and the respective discharge amount distributions. Must also be constant.

  FIG. 9A is a diagram showing the distribution of the ultraviolet curable resin 31A after ejection in the mold surface, and FIG. 9B is a diagram showing the resin thickness. In this embodiment, as shown in FIGS. 9A and 9B, the control unit 48 discharges more UV curable resin 31A to the outer peripheral side of the concave / convex pattern 15 of the mold 47A. By discharging a large amount of the ultraviolet curable resin 31A to the outer peripheral side in this way, when the ultraviolet curable resin 31A flows along the concave / convex pattern 15 in the step of spreading in step S3 described later, the ultraviolet curable resin on the outer peripheral side is flown. The shortage of 31A can be prevented, and the ultraviolet curable resin 31A can be evenly spread over the uneven pattern 15 with a predetermined thickness.

The control unit 48 moves the discharge unit 19 as much as possible to the outermost periphery of the concave / convex pattern 15 of the mold 47A by programming control so that the ultraviolet curable resin 31A spreads as much as possible. Further, as shown in FIG. 8 (f), after completion of the discharge, the apparatus waits above the central portion of the mold 47A until the discharge to the mold 47A is completely completed.
Step S2 (chuck moving step): As shown in FIG. 10B, the control unit 48 drives the chuck unit 20 to convey the first lens member 11 above the movable base 41A. The first lens member 11 is attached to the chuck unit 20 manually. In this embodiment, as shown in FIG. 10A, a small amount of the ultraviolet curable resin 31A is discharged to the central portion of the first lens member 11 before being conveyed. When the first lens member 11 is pressed against the mold 47A by this method, the affinity with the ultraviolet curable resin 31A discharged to the mold 47A is increased, and the generation of bubbles when contacting the ultraviolet curable resin 31A is suppressed. can do.

  The chuck unit 20 has a chuck body 33 on the lower side. The chuck body 33 is in contact with the upper surface of the first lens member 11 via the O-ring 34 and can be sucked and held in a state where the first lens member 11 is suspended. The inner diameter of the O-ring 34 is set larger than the shape transfer area of the mold 47A. The outer diameter of the O-ring 34 is set smaller than the peripheral edge of the first lens member 11. The inside of the chuck unit 20 is formed hollow so that the ultraviolet rays 37 can be irradiated downward.

  The control unit 48 moves the chuck unit 20 so that the optical axis of the first lens member 11 coincides with the central axis of the mold 47A, and then, as shown in FIG. The first lens member 11 is placed on the upper surface. At this time, the first lens member 11 has the lens surface facing up. In this state, one surface of the first lens member 11 is held substantially flush with the upper surface of the movable pedestal 41A.

  Step S3 (pushing and spreading process): The control unit 48 is movable as shown in FIGS. 10C and 10D while maintaining the state where the chuck unit 20 holds the first lens member 11 from above. The base 41A is gradually lowered and stopped at a predetermined height. Thereby, the relative space | interval of the metal mold | die 47A and the 1st lens member 11 becomes small, and the ultraviolet curable resin 31A of the metal mold | die 47A is pushed open.

  As shown in FIG. 11A, the ultraviolet curable resin 31A is discharged in a cross shape on the concave / convex pattern 15 of the mold 47A, and a part of the groove 15a of the concave / convex pattern 15 is pushed by the ultraviolet curable resin 31A. Wet before spreading. Therefore, when spreading, the ultraviolet curable resin 31A moves smoothly while passing through the groove 15a of the concave-convex pattern 15 as shown in FIG. For this reason, generation | occurrence | production of the bubble resulting from a space producing between the ultraviolet curable resin 31A and the groove | channel 15a of the uneven | corrugated pattern 15 is suppressed. In addition, since the waiting time until the ultraviolet curable resin 31A spreads evenly is short, the time required for spreading the ultraviolet curable resin 31A can be shortened.

  As described above, the discharge amount in each direction of the ultraviolet curable resin 31 </ b> A discharged in a cross shape is accurately controlled by the control unit 48. Therefore, at the time of spreading, the ultraviolet curable resin 31A moves while passing through the groove 15a of the concavo-convex pattern 15, and spreads as a whole. Thereby, the ultraviolet curable resin 31A spreads evenly over the concave / convex pattern 15 of the mold 47A with a predetermined thickness, and the optical performance can be ensured by setting the thickness of the first resin layer 13 after molding to a predetermined value. Moreover, the optical performance can be ensured by eliminating the film thickness unevenness of the first resin layer 13 after molding.

  In particular, in this embodiment, as shown in FIG. 9, the spread area of the central portion and the spread area of the outer peripheral portion are calculated on the outer peripheral side of the concavo-convex pattern 15 of the mold 47 </ b> A. Since 31A is discharged, when the ultraviolet curable resin 31A flows along the concavo-convex pattern 15, the ultraviolet curable resin 31A on the outer peripheral side is not deficient, and the ultraviolet curable resin 31A has a predetermined thickness on the concavo-convex pattern 15. Can be spread evenly.

  Step S4 (ultraviolet irradiation process): The control unit 48 turns on the ultraviolet light source 38 in the state shown in FIG. 10E and irradiates the first lens member 11 with the ultraviolet light 37 to cure the ultraviolet curable resin 31A. Let Thereby, the 1st resin layer 13 which makes a diffraction grating in one surface of the 1st lens member 11 is formed. Specifically, first, ultraviolet rays 37 are irradiated from the inside of the chuck unit 20 in a state where the first lens member 11 is pressed from above by the O-ring 34. Then, the chuck unit 20 is retracted when the ultraviolet curable resin 31A is cured.

Step S5 (mold release step): As shown in FIG. 10F, the control unit 48 raises the movable base 41A after the ultraviolet curable resin 31A is cured. Thereby, the 1st lens member 11 in which the 1st resin layer 13 was formed separates from metallic mold 47A.
Step S6 (lens removal step): The first lens member 11 formed with the first resin layer 13 separated from the mold 47A is removed. In this embodiment, the removal is performed manually. Note that the chuck unit 20 may be used for removal.

Thus, the first step of forming the first resin layer 13 on the first lens member 11 using the first molding unit 18A is completed.
(Second step)
In the second step, the first lens member 11 and the second lens member 12 are bonded together by using a second molding unit 18B configured in substantially the same manner as the first molding unit 18A.

Here, a difference between the second molding unit 18B and the first molding unit 18A will be briefly described. In the second molding unit 18 </ b> B, as shown in FIG. 12A, the upper surface of the mold 47 </ b> B is formed in a slightly larger circle than the first lens member 11. An annular mounting portion 47b for mounting the first lens member 11 is formed on the upper surface of the mold 47B.
Hereinafter, the contents of the second step will be sequentially described.

Step S7 (mold replacement step): The first molding unit 18A disposed on the base 16 is replaced with the second molding unit 18B.
Step S8 (lens arrangement step): As shown in FIG. 12A, the control unit 48 arranges the first lens member 11 on the mounting portion 47b of the mold 47B of the second molding unit 18B. . More specifically, the control unit 48 conveys the first lens member 11 by the chuck unit 20 above the mold 47B of the second molding unit 18B. The first lens member 11 is attached to the chuck unit 20 manually. Then, after aligning the optical axis of the first lens member 11 and the center of the mold 47B, the first lens member 11 is mounted on the mounting portion 47b of the mold 47B. At this time, the first lens member 11 has the formation surface of the first resin layer 13 facing upward.

  Step S9 (Discharge process): The control unit 48 discharges the ultraviolet curable resin 31B to the first resin layer 13 as shown in FIG. The discharge is performed by sequentially discharging the ultraviolet curable resin 31B in the −X, X, −Y, and Y directions onto the concave / convex pattern 15 of the first resin layer 13 in the same manner as in the first step. Since the description of the discharge is substantially the same as the discharge process of the first process described above, the description is omitted. In the second step, an ultraviolet curable resin 31B different from the first step is used. At this time, the control unit 48 performs control in advance so that the upper surface of the movable base 41B of the second molding unit 18B is higher than the position of the first resin layer 13.

  Step S10 (chuck moving step): As shown in FIG. 12D, the second lens member 12 is conveyed above the movable base 41B by the chuck unit 20. The second lens member 12 is attached to the chuck unit 20 manually. In this embodiment, as shown in FIG. 12C, a small amount of the ultraviolet curable resin 31B is discharged to the central portion of the second lens member 12 before being transported. By this method, when the second lens member 12 is pressed against the first resin layer 13 of the first lens member 11, the affinity with the ultraviolet curable resin 31B discharged to the first resin layer 13 is increased, and ultraviolet rays are increased. It is possible to suppress the generation of bubbles when the cured resin 31B is in contact.

  Then, after aligning the optical axes of the first lens member 11 and the second lens member 12, the control unit 48 places the lens surface on the upper surface of the movable base 41B as shown in FIG. The second lens member 12 is placed upward. In this state, since the outer periphery of the second lens member 12 is caught on the upper surface of the movable pedestal 41B, the mold 47B of the second lens member 12 is held in parallel with the upper surface of the movable pedestal 41B.

  Step S11 (pushing and spreading step): While maintaining the state where the chuck unit 20 holds the second lens member 12 from above, as shown in FIGS. 12 (f) and 12 (g), the movable base 41B is gradually moved. Lower and stop at a predetermined height. Thereby, the relative space | interval of the 1st lens member 11 and the 2nd lens member 12 becomes small, and the ultraviolet curable resin 31B is expanded. Since the explanation of this expansion is almost the same as the above-described expansion process of the first process, a duplicate description is omitted.

Step S12 (ultraviolet irradiation step): As shown in FIG. 12G, the second lens member 12 is irradiated with ultraviolet rays 37 to cure the ultraviolet curable resin 31B. Since the explanation of the ultraviolet irradiation is almost the same as that in the first step described above, the duplicate explanation is omitted.
Thereby, as shown in FIG. 12H, an optical element in which the first lens member 11 and the second lens member 12 are bonded together is formed. In the second step, the concave / convex pattern 15 of the diffraction grating of the first resin layer 13 serves as a mold material. Therefore, in the first resin layer 13 and the second resin layer 14 between the lens members, a diffraction grating having a shape that meshes with each other is formed.

  In the above-described embodiment, when the ultraviolet curable resins 31A and 31B are spread, the ultraviolet curable resins 31A and 31B move while passing through the grooves 15a of the concavo-convex pattern 15, so that bubbles are formed on the concavo-convex pattern 15 of the diffractive optical element. Mixing can be effectively prevented. Further, the ultraviolet curable resins 31A and 31B move while passing through the grooves 15a of the concave / convex pattern 15 and merge at a position of 45 degrees with respect to the X and Y axes, and the ultraviolet curable resins 31A and 31B become the mold 47A or the first one. Since the uneven pattern 15 of the resin layer 13 spreads evenly with a predetermined thickness, the optical performance can be ensured by eliminating unevenness in the thickness of the first resin layer 13 and the second resin layer 14 after molding.

(Supplementary items of the embodiment)
As mentioned above, although this invention has been demonstrated by said embodiment, the technical scope of this invention is not limited to the said embodiment.
(1) In the above-described embodiment, the example in which the first molding unit 18A is replaced with the second molding unit 18B in the second step has been described. However, the first molding unit 18A and the second molding are formed on the base 16. By providing both units 18B, the exchange can be eliminated.

(2) In the above-described embodiment, the example in which the ultraviolet curable resins 31A and 31B are discharged in a cross shape with respect to the ring-shaped uneven pattern 15 has been described. However, for example, it may be discharged only in the X direction or the Y direction. . Further, it may be discharged in a Y shape at an angle of 120 degrees from the center. In short, it may be discharged symmetrically from the center.
(3) The resin of the present invention is not limited to the ultraviolet curable resins 31A and 31B, and may be, for example, a thermosetting resin.

  (4) The number of resin layers in the present invention is not limited to two layers as in the above embodiment. For example, the optical element may have only one resin layer, or three or more resin layers may be laminated.

It is explanatory drawing which shows a diffractive optical element. It is explanatory drawing which shows the uneven | corrugated pattern of FIG. It is explanatory drawing which shows the manufacturing apparatus of the diffractive optical element of FIG. It is explanatory drawing which shows the discharge unit of FIG. It is explanatory drawing which shows the chuck | zipper unit of FIG. It is explanatory drawing which shows the shaping | molding unit of FIG. It is explanatory drawing which shows the manufacturing process of the diffractive optical element of FIG. It is explanatory drawing which shows the discharge process of FIG. It is explanatory drawing which shows the discharge method to an uneven | corrugated pattern. It is explanatory drawing which shows the expansion process etc. of FIG. It is explanatory drawing which shows the effect | action of the expansion process of FIG. It is explanatory drawing which shows the 2nd process of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 ... 1st lens member, 12 ... 2nd lens member, 13 ... 1st resin layer, 14 ... 2nd resin layer, 15 ... Uneven pattern, 18 ... Molding unit, 19 ... Discharge unit, 20 ... Chuck Units 31A, 31B ... UV curable resin, 47A, 47B ... mold, 48 ... control unit.

Claims (6)

A resin discharge step of discharging an uncured optical material resin to a ring-shaped uneven pattern formed in the mold;
An unfolding step of pressing an optical member against the uncured optical material resin to spread the optical material resin on the uneven pattern;
A curing step of curing the optical material resin,
A method for producing a diffractive optical element, wherein the ejection of the optical material resin in the resin ejection step is performed at a position symmetric with respect to the center of the ring-shaped uneven pattern. A resin discharge step of discharging an uncured optical material resin to a ring-shaped uneven pattern formed on the first optical member;
A step of spreading and spreading the optical material resin to the concavo-convex pattern by pressing a second optical member against the uncured optical material resin;
A curing step of curing the optical material resin,
A method for producing a diffractive optical element, wherein the ejection of the optical material resin in the resin ejection step is performed at a position symmetric with respect to the center of the ring-shaped uneven pattern. In the manufacturing method of the diffractive optical element according to claim 1 or 2,
A method of manufacturing a diffractive optical element, wherein the optical material resin is discharged in a cross shape with respect to the ring-shaped uneven pattern in the resin discharging step. In the manufacturing method of the diffractive optical element according to any one of claims 1 to 3,
The method of manufacturing a diffractive optical element, wherein the optical member is a lens member. A discharge unit that discharges uncured optical material resin to a ring-shaped uneven pattern formed on a mold or an optical member;
Moving means for moving the discharge unit in the radial direction of the ring-shaped uneven pattern;
A resin discharge device comprising: The resin discharge device according to claim 5,
A resin discharge apparatus comprising: a control unit that controls a discharge amount of the optical material resin discharged from the discharge unit according to a position of the discharge unit.

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