JP2012180253A - Method for manufacturing optical element and apparatus for manufacturing optical element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To more reliably form a peripheral rough surface of an optical element by molding, in a method for manufacturing an optical element and an apparatus for manufacturing an optical element.SOLUTION: The method for manufacturing an optical element includes: a heating step of heating an optical element material 100; a pressing step of pressing the heated optical element material 100 with a first mold (11) and a second mold (12) placed opposite to each other via the optical element material 100 and a third mold (13) which transfers a rough surface shape thereof to a part serving as a peripheral part of an optical element 200 so that the shape is transferred to the optical element material 100; and a cooling step of cooling the pressed optical element material 100, where in the pressing step, after the optical element material 100 reaches the molding surface 13a of the third mold (13), the optical element material 100 is vibrated while being held by the first mold (11) and the second mold (12).

Description

  The present invention relates to an optical element manufacturing method and an optical element manufacturing apparatus for manufacturing an optical element.

  Conventionally, in order to reduce the centering process, there is a technique for forming an outer peripheral rough surface of an optical element using an outer peripheral mold (see, for example, Patent Document 1).

  The reason for making the outer periphery of the optical element rough is to prevent flare and ghosting. For example, flare and ghost can be prevented by scattering stray light incident on the outer periphery of the optical element in the imaging optical system to reduce the intensity of regular reflection of stray light. In order to prevent flare and ghosting, a black paint may be applied to the outer peripheral surface of the optical element. However, if the outer peripheral surface of the optical element is not a rough surface, the workability of application is reduced, so that a rough surface is desirable.

JP 2009-196857 A

By the way, when manufacturing an outer periphery rough surface by shaping | molding, the glass which is optical element material cannot reach the uneven | corrugated valley bottom of the shaping | molding surface of an outer periphery shaping | molding die, and a rough surface may not be formed reliably on an outer peripheral surface.
For example, the optical element material may not reach the bottom of the valley and rounds due to surface tension, and may become a mirror surface locally. This is because the normally used glass preform has a mirror surface and the mirror surface remains locally. However, the local mirror surface cannot be seen unless viewed with a microscope, and the outer peripheral surface can be seen only as a rough surface as long as it is viewed with the naked eye. In addition, when grinding a glass with a grindstone and forming a rough surface in an outer peripheral surface, it takes time and effort to form a rough surface.

  When an optical element having an outer peripheral rough surface that is locally a mirror surface as described above is used in an optical system, there is a risk of flare and ghost depending on the optical system. In order to obtain a flare and ghost prevention effect, a rough outer surface without a mirror surface is desirable.

  In the case where the centering process is reduced by molding, in the related art, the joint (ridge line portion) between the outer peripheral surface and other surfaces becomes a mirror surface, and the outer peripheral rough surface may not be reliably formed. This is because the mold for molding the other surface slides with respect to the mold for molding the outer peripheral surface, so that a clearance between the molds is required.

  When the centering process is employed, chamfering processing is performed by grinding so that the ridge line part becomes a rough surface. However, in the molding technique in which the centering process is omitted, the ridge line part becomes a mirror surface as described above. When such an optical element is used in an optical system, there is a risk of flare and ghost depending on the optical system. Therefore, a ridge portion having no mirror surface is desirable to obtain a flare and ghost prevention effect.

  As described above, in the conventional molding, the outer peripheral surface and the ridge line portion of the optical element are caused to have a mirror surface portion, so that the outer peripheral rough surface cannot be reliably formed. For example, a flare and ghost prevention effect can be applied to the optical element. It could not be given effectively.

  The objective of this invention is providing the manufacturing method of an optical element and the manufacturing apparatus of an optical element which can form the outer periphery rough surface of an optical element reliably by shaping | molding.

  The optical element manufacturing method of the present invention includes a heating step of heating an optical element material, a first mold and a second mold that are arranged to face each other with the optical element material interposed therebetween, and an outer periphery of the optical element. A third molding die for transferring a rough surface shape to a portion to be a part, a pressurizing step of pressurizing the heated optical element material so as to transfer the shape to the optical element material, and pressurization A cooling step for cooling the optical element material, and after the optical element material has reached the molding surface of the third mold in the pressing step, the optical element material is transformed into the first mold and It vibrates in the state clamped with the said 2nd shaping | molding die.

  In the method for manufacturing an optical element, in the vibration applying step, the relative position between the first mold and the second mold may be changed in both an approaching direction and a moving away direction. The element material may be vibrated.

  In the optical element manufacturing method, in the vibration applying step, the relative position between the first mold and the second mold is intermittently changed to one of an approaching direction and a moving away direction. As described above, the optical element material may be vibrated.

  In the optical element manufacturing method, in the vibration applying step, at least one of a first drive unit that moves the first mold and a second drive unit that moves the second mold. The optical element material may be vibrated.

  The method of manufacturing an optical element of the present invention includes a heating unit that heats an optical element material, and a first mold that is disposed to face the optical element material by pressing the heated optical element material. And a second molding die and a third molding die for transferring the rough surface shape to the outer peripheral portion of the optical element, a pressurizing portion for transferring the shape to the optical element material, and the optical element material. A vibration applying unit that vibrates in a state of being sandwiched between the first mold and the second mold.

  The vibration applying unit may be at least one of a first drive unit that moves the first mold and a second drive unit that moves the second mold.

  According to the present invention, the outer peripheral rough surface of the optical element can be reliably formed by molding.

It is sectional drawing which shows the manufacturing apparatus of the optical element which concerns on one embodiment of this invention. It is sectional drawing which shows the manufacturing apparatus of the optical element which concerns on one embodiment of this invention. It is sectional drawing which shows the outer periphery shaping | molding die in one embodiment of this invention. FIG. 3 is an enlarged view of part A of FIG. 2 (part 1). FIG. 3 is an enlarged view of part A in FIG. 2 (part 2). FIG. 3 is an enlarged view of part A of FIG. 2 (part 3). FIG. 4 is an enlarged view (No. 4) of part A in FIG. 2. FIG. 6 is an enlarged view of part A of FIG. 2 (No. 5). It is the B section enlarged view (the 1) of FIG. 1B. It is the B section enlarged view (the 2) of FIG. 1B. It is the B section enlarged view (the 3) of FIG. 1B. It is the B section enlarged view (the 4) of FIG. 1B. It is sectional drawing which shows the manufacturing apparatus of the optical element which concerns on the 1st modification of one embodiment of this invention. It is sectional drawing (the 1) which shows the manufacturing apparatus of the optical element which concerns on the 2nd modification of one embodiment of this invention. It is sectional drawing (the 2) which shows the manufacturing apparatus of the optical element which concerns on the 2nd modification of one embodiment of this invention.

  Hereinafter, an optical element manufacturing method and an optical element manufacturing apparatus according to embodiments of the present invention will be described with reference to the drawings.

1A and 1B are cross-sectional views showing an optical element manufacturing apparatus 1 according to an embodiment of the present invention.
1A and 1B includes an upper contact plate (first contact member) 2, a lower contact plate (second contact member) 3, a pressure unit, and vibration application. An upper drive unit (first drive unit) 4 and a lower drive unit (second drive unit) 5 which are examples of the unit are provided.

  The upper contact plate 2 is in contact with the upper surface of a mold set 10 to be described later. For example, two heaters (heating units) 2 a and 2 a for heating the optical element material 100 are inserted into the upper contact plate 2. The optical element material 100 is, for example, glass, plastic or the like, and is a material used for manufacturing an optical element such as a lens. The upper mold 12 may be fixed to the upper contact plate 2.

  The lower contact plate 3 contacts the bottom surface of the mold set 10. For example, two heaters (heating units) 3 a and 3 a for heating the optical element material 100 are inserted into the lower contact plate 3. The lower contact plate 3 is formed with a through hole 3b extending in the vertical direction in the center. The through hole 3 b is penetrated by the lower drive unit 5.

  The upper drive unit 4 and the lower drive unit 5 are, for example, pistons of an air cylinder. The upper drive unit 4 is connected to the upper contact plate 2 and moves the upper contact plate 2 up and down. The lower drive part 5 penetrates the through hole 3b of the lower contact plate 3 as described above, and presses the lower mold 11 from below. The upper drive unit 4 and the lower drive unit 5 pressurize the heated optical element material 100 to form the optical element material 100 by the lower mold 11, the upper mold 12, and the outer peripheral mold 13 described later. Transfer the shape. Although described later in detail, the upper drive unit 4 and the lower drive unit 5 vibrate the optical element material 100.

The mold set 10 includes a lower mold (first mold) 11, an upper mold (second mold) 12, an outer peripheral mold (third mold) 13, a sleeve 14, and a positioning ring 15. .
The lower mold 11 and the upper mold 12 are arranged to face each other with the optical element material 100 interposed therebetween. A convex molding surface 11 a that transfers the concave shape to the optical element material 100 is formed at the center of the upper end of the lower mold 11. Further, the lower mold 11 is formed with a narrow diameter portion 11b provided with the molding surface 11a and a base portion 11c that is continuous with the root portion of the narrow diameter portion 11b and has a diameter larger than that of the root portion. Has been.

  A concave molding surface 12 a that transfers the convex shape to the optical element material 100 is formed at the center of the lower end of the upper mold 12. The upper mold 12 has a small diameter portion 12b provided with the molding surface 12a, a medium diameter portion 12c provided above the small diameter portion 12b, and a large diameter provided above the medium diameter portion 12c. And a diameter portion 12d.

  The outer peripheral mold 13 has a cylindrical shape, is placed on a middle portion 14b of a sleeve 14 to be described later, and is slidable with respect to the inner peripheral surface of the thin portion 14a. Further, as shown in FIGS. 1B and 2, the inner peripheral surface of the outer peripheral mold 13 has an uneven shape or the like (recessed portion 13 a-1) in a portion that becomes the outer peripheral portion 202 of the optical element 200 in the optical element material 100. A molding surface 13a for transferring the rough surface shape is formed.

The sleeve 14 has a cylindrical shape with a constant outer diameter. Since the thin portion 14a, the middle thickness portion 14b, and the thick portion 14c are formed in order from the top on the sleeve 14, the inner diameter is not constant.
On the inner peripheral surface of the thin portion 14a of the sleeve 14, the upper mold 12 slides on the medium diameter portion 12c, and the outer peripheral mold 13 slides on the outer peripheral surface. A positioning ring 15 described later slides on the inner peripheral surface of the inner wall portion 14b of the sleeve 14 at the flange portion 15c. On the inner peripheral surface of the thick portion 14c of the sleeve 14, the lower mold 11 slides on the base portion 11c.

  The small diameter portion 11b of the lower mold 11 is inserted into the through hole 15a of the positioning ring 15 from below. The positioning ring 15 positions the optical element material 100 placed on the upper end of the through hole 15a as shown in FIG. 1A.

  On the upper surface of the positioning ring 15, a molding surface 15 b for transferring the uneven shape to the optical element material 100 is formed. A flange portion 15 c is formed at the lower end of the positioning ring 15.

Hereinafter, a method for manufacturing the optical element according to the present embodiment will be described.
First, as shown in FIG. 1A, in a state where the lower mold 11, the outer peripheral mold 13 and the positioning ring 15 are arranged in the sleeve 14, a robot (not shown) inserts the ball-shaped optical element material 100 into the through hole of the positioning ring 15. Place on 15a. The position of the glass 100 is positioned by the upper end of the through hole 15 a of the positioning ring 15.

  A robot (not shown) places the upper mold 12 on the optical element material 100. As shown in FIG. 1B, the lower drive unit 5 presses the lower mold 11 upward, causes the small-diameter portion 11b of the lower mold 11 to penetrate the through hole 15a of the positioning ring 15, and forms the molding surface 11a of the lower mold 11 Is brought into contact with the optical element material 100.

  The optical element material 100 disposed between the lower mold 11 and the upper mold 12 is heated by heat conduction from the heaters 2a, 2a, 3a, 3a of the upper contact plate 2 and the lower contact plate 3 (heating process). ). Then, the optical element material 100 is heated and softened to, for example, a glass transition temperature or higher.

  The heated optical element material 100 is pressurized by pressing the lower mold 11 upward by the lower drive unit 5 as shown in FIG. 1B (pressurizing step). In the present embodiment, the small diameter portion 11b of the lower mold 11 passes through the through hole 15a of the positioning ring 15, and the lower mold 11 presses the optical element material 100 on the molding surface 11a. Thereby, the shape of the optical element material 100 is transferred by the molding surfaces 11a, 12a, 13a, and 15b of the lower mold 11, the upper mold 12, the outer peripheral mold 13, and the positioning ring 15. The heating process and the pressurizing process may be performed on different stages. Each stage has, for example, an upper contact plate 2, a lower contact plate 3, an upper drive unit 4, and a lower drive unit 5.

  Here, after the optical element material 100 reaches the molding surface 13a of the outer peripheral mold 13 in the pressurizing step, at least one of the upper drive unit 4 and the lower drive unit 5 places the optical element material 100 on the lower mold 11 and the upper mold unit 11. It vibrates (or swings or finely moves) while being held by the mold 12 (vibration applying step).

  In the vibration applying step, the relative position between the lower mold 11 and the upper mold 12 is changed periodically (alternately) in both the approaching direction and the moving away direction by at least one of the upper drive unit 4 and the lower drive unit 5. Thus, the optical element material 100 is vibrated. At this time, the optical element material 100 is desirably vibrated at, for example, 1 Hz or higher, but may be lower than that.

3A to 3E are enlarged views of part A in FIG.
As shown in FIG. 2, the molding surface 13a formed on the inner peripheral surface of the outer peripheral mold 13 has a plurality of recesses 13a-1 shown enlarged in FIG. 3A and the like.

  As shown in FIG. 3A, simply pressurizing the optical element material 100 between the lower mold 11 and the upper mold 12, the optical element material 100 does not enter the depth of the recess 13a-1, and the tip is rounded. Further, the tip of the optical element material 100 becomes a locally remaining mirror surface.

  As shown in FIG. 3B, when the optical element material 100 moves upward at the time of vibration, the optical element material 100 comes into contact with the upper portion of the recess 13a-1, and the shape is transferred. At the time of this contact, the optical element material 100 enters the recess 13a-1. In the present embodiment, the outer peripheral mold 13 can move integrally with the optical element material 100 (following the optical element material 100), but the optical element material 100 moves upward even when moving integrally. Enters into the recess 13a-1 due to the inertia that is activated by the start of.

  As shown in FIG. 3C, when the optical element material 100 moves downward during vibration, the optical element material 100 comes into contact with the lower portion of the recess 13a-1 and the shape is transferred. Also at the time of this contact, the optical element material 100 enters the recess 13a-1. The inertia that can work at this time is due to the stop of the upward movement and the start of the downward movement.

As shown in FIG. 3D, when the optical element material 100 moves upward again during vibration, the optical element material 100 further enters the recess 13a-1 and a more complicated shape can be transferred.
As shown in FIG. 3E, the optical element material 100 does not have a local mirror surface by vibrating as described above.

  The optical element material 100 may be vibrated with a swing width equal to or smaller than the pitch P of the recesses 13a-1, but in this embodiment, the outer peripheral mold 13 can move integrally with the optical element material 100. The optical element material 100 may be vibrated with a swing width equal to or greater than the pitch P of the recesses 13a-1. When the pitch P of the recesses 13a-1 is, for example, 10 μm to 30 μm, the optical element material 100 may be vibrated by disposing a vibration applying unit such as an ultrasonic vibrator in the manufacturing apparatus 1 or the mold set 10.

  Even when the optical element material 100 does not move up and down in the recess 13a-1 as shown in FIGS. 3A to 3E, the optical element material 100 enters the recess 13a-1 by vibration.

4A to 4D are enlarged views of a portion B in FIG. 1B.
As shown in FIG. 4A, by simply pressurizing the optical element material 100 between the lower mold 11 and the upper mold 12, a joint (ridge line) between the outer peripheral surface of the optical element material 100 and the upper and lower surfaces, which are other surfaces, is provided. The portion) becomes the mirror surface portion 100a. This is because the mold for molding the upper surface and the lower surface of the optical element material (in FIG. 4A and the like, the positioning ring 15 for molding the lower surface) slides relative to the outer mold 13 for molding the outer peripheral surface of the optical element material 100. This is because the clearance between the molds is required.

  As shown in FIG. 4B, the mirror surface portion 100a is formed by the optical element material 100 entering the molding surface 13a of the outer peripheral mold 13 during vibration, and as shown in FIG. 4C, the outer peripheral mold 13 is equal to the clearance with the sleeve 14. 4B. As shown in FIG. 4D, the positioning ring 15 becomes smaller or disappears due to movement of the positioning ring 15 to the left and right by the clearance from the outer peripheral mold 13 as shown in FIG. 4D. Thereby, a rough surface is formed in the above-mentioned ridge line portion of the optical element material 100.

  In the middle of the vibration applying process or after the vibration applying process is completed, the optical element material 100 is obtained by the temperature of the heaters 2a, 2a, 3a, 3a of the upper contact plate 2 and the lower contact plate 3 being lowered or It is cooled by natural cooling (cooling process). In this cooling step, the optical element material 100 contracts more than the outer peripheral mold 13 and can be taken out from the outer peripheral mold 13.

  After the cooling step, the robot (not shown) takes out the upper mold 12 from the sleeve 14 and then takes out the manufactured optical element 200. Note that the vibration applying step can be completed by the end of the cooling step (when the optical element 200 can be taken out).

  In the vibration applying step, the optical element material 100 may be vibrated so that the relative position between the lower mold 11 and the upper mold 12 is intermittently changed to one of the approaching direction and the moving away direction.

  Further, the optical element material 100 may be vibrated in the horizontal direction, the diagonal direction, the rotation direction, and the like, not in the vertical direction (the direction in which the lower mold 11 and the upper mold 12 approach and move away from each other). Furthermore, you may make it vibrate in the some direction of these.

  The optical element material 100 may be vibrated while the temperature of the optical element material 100 is not lower than the glass transition temperature and not higher than the molding temperature (for example, yield temperature +10 to 30 °). Note that when the optical element material 100 vibrates at a temperature equal to or higher than the molding temperature, the surface accuracy and the thickness system become unstable. In the cooling step, even if the optical element material 100 is vibrated at a temperature lower than the glass transition temperature, that is, in a cured state, the optical element material 100 does not enter the molding surface 13 a of the outer peripheral mold 13. Therefore, the timing of the vibration applying process is ideally the situation where the optical surface and the central portion of the optical element material 100 are cooled first to stabilize the surface accuracy and thickness, but the outer peripheral surface is still soft.

  Further, the optical element material 100 may be vibrated by one of the upper drive unit 4 and the lower drive unit 5 or may be vibrated by another vibration applying unit such as an ultrasonic vibrator.

  In the present embodiment described above, in the vibration applying process, after the optical element material 100 reaches the molding surface 13a of the outer peripheral mold (third mold) 13 in the pressurizing process, the optical element material 100 is lowered. It vibrates in a state of being sandwiched between a mold (first mold) 11 and an upper mold (second mold) 12. Therefore, a rough surface can be reliably formed on the outer peripheral surface of the optical element material 100 or the ridge line portion between the outer peripheral surface and another surface. Therefore, according to the present embodiment, the outer peripheral rough surface of the optical element can be reliably formed by molding.

  Further, in the present embodiment, in the vibration applying step, the lower drive unit 5 that moves the lower mold (first mold) 11 and the upper drive unit that moves the upper mold (second mold) 12. The optical element material 100 is vibrated by at least one (both) of the (second driving unit) 4. Therefore, the outer peripheral rough surface can be reliably formed by molding with a simple configuration.

FIG. 5 is a cross-sectional view illustrating the optical element manufacturing apparatus 1-1 according to the first modification.
In the optical element manufacturing apparatus 1-1 of the present modification, only the mold set 20 that accommodates the optical element material 100 is different from the optical element manufacturing apparatus 1 (mold set 10) shown in FIGS. 1 and 1B.

  The mold set 20 includes a lower mold (first mold) 21, an upper mold (second mold) 22, a sleeve (third mold) 24, and a positioning ring 25. The mold set 20 does not include the outer peripheral mold 13 of the mold set 10.

  The lower mold 21 and the upper mold 22 are disposed to face each other with the optical element material 100 interposed therebetween. The lower mold 21 is the same as the lower mold 11 of the mold set 10, and has a molding surface 21a, a small diameter portion 21b, and a base portion 21c.

  A concave molding surface 22 a for transferring the convex shape to the optical element material 100 is formed at the center of the lower end of the upper mold 22. Moreover, the upper mold | type 22 has the small diameter part 22b in which the molding surface 22a was provided, and the large diameter part 22c provided in the upper part of this small diameter part 22b.

  The sleeve 24 has a cylindrical shape with a constant outer diameter. A thin portion 24 b is formed on the upper portion of the sleeve 24, and a thick portion 24 c is formed on the lower portion of the sleeve 24. Therefore, the inner diameter of the sleeve 24 is not constant.

  Formed on the inner peripheral surface of the thin portion 24 b of the sleeve 24 is a molding surface 24 a that transfers a rough surface shape such as a concavo-convex shape to the outer peripheral portion of the optical element material 100. Further, on the inner peripheral surface of the thin portion 24b of the sleeve 24, the upper mold 22 slides on the small diameter portion 22b, and the positioning ring 25 slides on the outer peripheral surface. On the inner peripheral surface of the thick portion 24c of the sleeve 24, the lower mold 21 slides on the base portion 21c.

  Since the sleeve 24 does not move integrally with the optical element material 100 (following the optical element material 100) like the above-described outer peripheral mold 13, it is equal to or less than the pitch P of the recesses 13a-1 shown in FIGS. 3A to 3D. It is good to vibrate with a swing width of.

  The small diameter portion 21b of the lower mold 21 is inserted into the through hole 25a of the positioning ring 25 from below. The positioning ring 25 positions the optical element material 100 placed on the upper end of the through hole 25a.

  On the upper surface of the positioning ring 25, a molding surface 25 b for transferring the uneven shape to the optical element material 100 is formed. A flange portion 25 c is formed at the lower end of the positioning ring 25.

  In this modification, the example in which the outer peripheral mold 13 is omitted has been described. However, the positioning rings 15 and 25 are omitted, and the shape is transferred to the entire lower surface of the optical element material 100 by the lower molds 11 and 21. Also good.

6A and 6B are cross-sectional views illustrating an optical element manufacturing apparatus 1-2 according to a second modification.
This modification is different from the optical element manufacturing apparatus 1 shown in FIGS. 1 and 1B in that the optical element material 100 is pressed by the upper mold 32 in the pressurizing step, and in the configuration associated therewith.

  The optical element manufacturing apparatus 1-2 shown in FIGS. 6A and 6B includes an upper contact plate (first contact member) 2, a lower contact plate (second contact member) 3, and a vibration applying unit. The upper drive part (drive part) 4 which is an example is provided. In the present modification, since the lower drive unit 5 is not disposed, the lower contact plate 3 is not formed with a through hole 3b that allows the lower drive unit 5 to pass therethrough.

  The mold set 30 includes a lower mold 31 that is an example of a first mold, an upper mold 32 that is an example of a second mold, an outer peripheral mold 33 that is an example of a third mold, and a sleeve 34. And a positioning ring 35.

A concave molding surface 31 a for transferring the convex shape to the optical element material 100 is formed at the center of the upper end of the lower mold 31.
A convex molding surface 32 a for transferring the concave shape to the optical element material 100 is formed at the center of the lower end of the upper mold 32. Further, the upper die 32 is formed with a narrow diameter portion 32b provided with the molding surface 32a and a base portion 32c which is continuous with the root portion of the narrow diameter portion 32b and has a diameter larger than that of the root portion. Has been.

  The outer peripheral mold 33 has a cylindrical shape and is disposed around the molding surface 31 a on the lower mold 31. Further, on the inner peripheral surface of the outer peripheral mold 33, a molding surface 33a for transferring the rough surface shape to the outer peripheral portion of the optical element material 100 is formed.

  The sleeve 34 has a cylindrical shape with a constant outer diameter and inner diameter, and is disposed on the outer periphery of the lower mold 31 and the upper mold 32. The sleeve 34 is in contact with the outer peripheral surface of the outer peripheral mold 33 on the inner peripheral surface thereof.

  The positioning ring 35 has a cylindrical shape in which a through hole 35a is formed through the small diameter portion 32b of the upper mold 32 from above. The positioning ring 35 is disposed between the lower mold 31 and the upper mold 32, and positions the optical element material 100 at the lower end of the through hole 35a.

  On the bottom surface of the positioning ring 35, a molding surface 35b for transferring the uneven shape to the optical element material 100 is formed. A large-diameter flange portion 35c is formed at the upper end of the positioning ring 35, and the positioning ring 35 is slidably in contact with the inner peripheral surface of the sleeve 34 at the outer peripheral surface of the flange portion 35c.

  As in this modification, the optical element material 100 can be vibrated only by the upper drive unit (second drive unit) 4 that moves the upper mold (second mold) 32.

DESCRIPTION OF SYMBOLS 1 Optical element manufacturing apparatus 2 Upper contact plate 2a Heater 3 Lower contact plate 3a Heater 3b Through-hole 4 Upper drive part 5 Lower drive part 10 Mold set 11 Lower mold 11a Molding surface 11b Small diameter part 11c Base part 12 Upper mold 12a molding surface 12b small diameter portion 12c medium diameter portion 12d large diameter portion 13 outer peripheral mold 13a molding surface 13a-1 concave portion 14 sleeve 14a thin portion 14b medium thickness portion 14c thick portion 15 positioning ring 15a through hole 15b molding surface 15c flange portion 20 mold set 21 lower mold 21a molding surface 21b small diameter part 21c base part 22 upper mold 22a molding surface 22b small diameter part 22c large diameter part 24 sleeve 24a molding surface 24b thin part 24c thick part 25 positioning ring 25a through hole 25b molding surface 25c Flange part 30 mold set 31 lower mold 31a Shape surface 32 Upper die 32a Molding surface 32b Small diameter portion 32c Base portion 33 Outer peripheral molding die 33a Molding surface 34 Sleeve 35 Positioning ring 35a Through hole 35b Molding surface 35c Flange portion 100 Optical element material 100a Mirror surface portion 200 Optical element 202 Outer periphery portion

Claims (6)

A heating step of heating the optical element material;
The first mold and the second mold that are arranged to face each other with the optical element material interposed therebetween, and the third mold that transfers the rough surface shape to the outer peripheral portion of the optical element, A pressurizing step of pressurizing the heated optical element material so as to transfer the shape to the optical element material;
Cooling the pressurized optical element material, and
After the optical element material reaches the molding surface of the third mold in the pressing step, the optical element material is vibrated in a state of being sandwiched between the first mold and the second mold. A method for manufacturing an optical element.   The said optical element material is vibrated so that the relative position of a said 1st shaping | molding die and a said 2nd shaping | molding die may be changed to both the approaching direction and the direction to go away in the said vibration provision process. Of manufacturing the optical element.   In the vibration applying step, the optical element material is vibrated so that the relative position between the first mold and the second mold is intermittently changed to one of the approaching direction and the moving away direction. The manufacturing method of the optical element of Claim 1.   In the vibration applying step, the optical element material is vibrated by at least one of a first drive unit that moves the first mold and a second drive unit that moves the second mold. The manufacturing method of the optical element of any one of Claims 1-3. A heating unit for heating the optical element material;
The heated optical element material is pressurized, and the first mold and the second mold that are arranged to face each other with the optical element material interposed therebetween, and a rough surface shape in the portion that becomes the outer peripheral portion of the optical element A pressure part for transferring the shape to the optical element material by a third mold for transferring
A vibration applying unit that vibrates the optical element material in a state of being sandwiched between the first mold and the second mold.   The optical element according to claim 5, wherein the vibration applying unit is at least one of a first drive unit that moves the first mold and a second drive unit that moves the second mold. Manufacturing equipment.

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