JP3133820B2 - Optical element molding method and molding apparatus - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for molding an optical element for integrally forming a resin layer on the surface of a glass member.

[0002]

2. Description of the Related Art Conventionally, there has been known a method in which a thin film made of a resin material is formed on the surface of a glass member to form a lens having an aspherical shape which is difficult to process with a glass material. A lens formed by such a method is generally called a replica lens.

In forming the replica lens, in order to ensure the optical performance of the completed replica lens, the optical axis of the glass member and the center axis of a mold for transferring a predetermined aspherical shape to the glass member are used. And must be exactly matched. Conventionally, as an example of a method for matching the optical axis of the glass member with the center axis of the mold, Japanese Patent Application Laid-Open No. 62-2722 discloses a method.
As disclosed in Japanese Patent Application Publication No. 03-2003, there is known a method of providing a flange portion on an outer peripheral portion of a glass member and fitting an outer peripheral surface of the flange portion to a fitting portion formed in a mold. Further, as another example, as disclosed in Japanese Patent Application Laid-Open No. 62-288030, by clamping both surfaces of a glass member processed into a spherical shape with a so-called bell clamp,
There is known a method of making the optical axis of the glass member coincide with the central axis of the mold by utilizing the centripetal action.

[0004]

However, in the method of providing a flange portion on a glass member among the above-mentioned conventional examples, since the process of forming the flange portion on the glass member is troublesome, the manufacturing cost of the lens increases. There is a problem. Further, since the flange portion is provided on the outer peripheral portion of the glass member, there is a problem that the size of the lens increases. In addition, the optical axis of the spherical portion of the glass member is desired to coincide with the center axis of the mold, but when the outer peripheral surface of the flange portion is fitted to the mold as described above, alignment is performed. When the optical axis of the spherical portion of the glass member and the central axis of the outer peripheral surface of the flange portion are slightly displaced due to a processing error or the like, the optical axis of the spherical portion deviates from the central axis of the mold by that much. There is.

Further, when a resin material is molded by a mold, the resin material usually contracts as the resin material cures. Regarding the radial contraction of this resin material,
Normally, due to slight differences in the degree of contraction of each part of the resin material,
The resin material does not shrink toward the center axis of the glass member, but shrinks at a position slightly shifted from the center axis. Therefore, with the curing of the resin material, a force acts on the glass member to move the glass member by a small distance in the radial direction with respect to the mold. And, as described above, when the glass member is fixed to center the glass member with respect to the mold, the glass member is a mold member even if the above-described force acts due to the contraction of the resin material. The resin material cannot be moved relative to the surface of the glass member, or the resin material is separated from the surface of the glass member. was there.

In the above conventional method using a bell clamp, the radius of curvature of the spherical surface of the glass member is large, and when the glass member is close to a flat surface, the centripetal force is weak. There was a problem that positioning was not possible. Therefore, the present invention has been made in view of the above-described problem, and a first object of the present invention is to make it possible to accurately match the center axis of the glass member with the center axis of the molding surface. It is another object of the present invention to provide a method and apparatus for molding an optical element such that separation does not occur between a glass member and a resin layer and between a mold member and a resin layer.

A second object of the present invention is to enable the optical axis of the glass member to exactly coincide with the center axis of the mold without specially processing the glass member. It is an object of the present invention to provide a molding device and a molding method for an optical element that do not cause an increase in size.

[0008]

In order to solve the above-mentioned problems and achieve the object, a method for forming an optical element according to the present invention comprises:
On the surface of the glass member, a resin layer having a predetermined surface shape,
An optical element molding method for forming an optical element in which a glass material and a resin material are integrated by forming by molding using a mold having a molding surface for transferring the predetermined surface shape. A step of supplying the resin material on a molding surface of the mold means or on a surface of the glass member; and defining a thickness of the resin layer on the surface of the glass member with respect to the molding surface. A mounting step of mounting the glass member on a supporting portion for supporting the glass member at a distance, and a resin filled in a space defined between the molding surface and the surface of the glass member. An alignment step of aligning the glass member with the mold means at a predetermined position in a direction along a plane substantially parallel to the molding surface when the material has a predetermined viscosity; Cures to a degree of polymerization A holding step of holding the glass member to the predetermined position, after the resin material is cured to a predetermined degree of polymerization, is characterized by comprising a releasing step of releasing the holding state of the glass member.

Further, in the molding method for an optical element according to the present invention, the alignment step, the viscosity of the resin material, when it is 10 ⁰ to 10 ⁶ cps, the glass member, as characterized by positioning I have. Further, in the method of molding an optical element according to the present invention, the positioning step includes moving a positioning member slidably fitted on an outer peripheral surface of the support portion in an axial direction to thereby center the molding surface. A centripetal operation is performed toward the axis, the outer periphery of the glass member is chucked, and the center axis of the glass member is positioned so as to coincide with the center axis of the molding surface.

In the method of molding an optical element according to the present invention, the releasing step releases the holding state of the glass member when the degree of polymerization of the resin material has hardened to 80 to 95%. And In addition, the method for molding an optical element according to the present invention uses a mold means having a molding surface for transferring a resin layer having a predetermined surface shape to the first surface of a glass member. Forming an optical element in which the glass material and the resin material are integrated by forming the glass element and the resin material by using a molding method. A supply step of supplying the resin material on a surface, and abutting on an outer peripheral portion of a first surface of the glass member,
A placing step of placing the glass member on a supporting portion for supporting the first surface at a distance from the molding surface by a distance that defines the thickness of the resin layer; An attachment step of attaching a lid having a clamp portion for abutting against an outer peripheral portion of a second surface facing the surface and having a clamp portion for clamping the glass member on the support portion, to the support portion; A rotation step of relatively rotating the support portion and the lid with the outer peripheral surface of the support and the inner peripheral surface of the lid fitted to each other is provided.

In the method for molding an optical element according to the present invention, the resin material is an active energy ray-curable resin. Further, the optical element molding apparatus of the present invention forms an optical element in which a glass material and a resin material are integrated by forming a resin layer having a predetermined surface shape on the surface of the glass member by molding. A molding surface for transferring the predetermined surface shape onto the surface of the resin layer, and the glass member, by moving the surface of the glass member from the molding surface to the resin layer. Mold means having a support portion for supporting in a state separated by a distance that defines the thickness of the resin material filled in a space defined between the molding surface and the surface of the glass member When the viscosity is within a predetermined viscosity, the glass member is aligned in a direction along a plane substantially parallel to the molding surface, and the alignment state is released when the resin material reaches a predetermined degree of polymerization. With alignment means The positioning means includes a fitting portion slidably fitted to the outer peripheral surface of the mold means, and a state in which the fitting portion is fitted to the outer peripheral surface of the mold means. A plurality of arms that open and close around the center axis of the molding surface by contacting the abutting portion with a cam surface provided on the mold means as the member moves in the axial direction; A claw portion provided at a tip end for chucking the glass member.

[0012]

In the optical element molding apparatus according to the present invention, a resin layer having a predetermined surface shape is formed on the first surface of the glass member by molding, whereby the glass material and the resin material are integrated. An optical element molding apparatus for forming a converted optical element, comprising a molding surface for transferring the predetermined surface shape to the surface of the resin layer, and a cylindrical shape having the optical axis of the molding surface as a center. A mold means having an outer peripheral surface, an inner peripheral surface fitted to the outer peripheral surface of the mold means, and an outer peripheral surface of the molding surface, formed on a circumference around the optical axis as a central axis, and A supporting portion for supporting the first surface in a state of being separated from the molding surface by a distance defining the thickness of the resin layer, and a cylindrical outer peripheral surface having the optical axis of the molding surface as a central axis. Supporting means having a circumferential direction on an outer peripheral surface of the supporting means. A fitting portion having an inner peripheral surface slidably fitted along the axial direction, a ceiling portion sealing an upper surface of the fitting portion, and an optical axis of the molding surface on the lower surface of the ceiling portion. Lid means formed on a circumference as an axis and having a clamp portion abutting on a second surface facing the first surface of the glass member; an outer peripheral surface of the support means; Rotation driving means for relatively rotating the support means and the lid means around the optical axis of the molding surface as a center axis in a state where the inner peripheral surface of the fitting portion is fitted. It is characterized by:

Further, in the optical element molding apparatus according to the present invention, the clamp portion is formed at a position corresponding to an outer circumference of a beam effective diameter of the glass member. Further, in the optical element molding apparatus according to the present invention, the rotation driving means includes a first driving means for rotating the lid means.

Further, in the optical element molding apparatus according to the present invention, the inner peripheral surface of the support means is slidable in the circumferential direction with respect to the outer peripheral surface of the mold means, and the rotation driving means is It is characterized in that it comprises a second drive means for rotating the support means.

In the optical element molding apparatus according to the present invention, the resin material is an active energy ray-curable resin.

[0017]

As described above, since the method and apparatus for molding an optical element according to the present invention are constructed, when the resin layer has a predetermined viscosity, the glass member is moved so that its central axis is aligned with the central axis of the molding surface. It is possible to align the center axis of the glass member with the center axis of the molding surface by positioning so that they match exactly, and then releasing this alignment state before the resin material is completely cured. Meanwhile, the resin layer can be prevented from peeling off.

Further, by rotating a supporting means for supporting the glass member with respect to the mold means and a lid having a clamp portion for clamping the glass member on the supporting means, Since the glass member easily moves in the centripetal direction with respect to the centripetal force, the optical axis of the glass member and the optical axis of the molding surface can be accurately matched.

[0019]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. (First Embodiment) FIG. 1 is a view showing a schematic structure of a molding apparatus used for molding an aspherical lens by the method for molding an optical element according to the first embodiment.

First, before describing the configuration of the molding apparatus, the outline of the method of molding an optical element according to the first embodiment will be described. The method of forming an optical element according to the first embodiment is for forming a shape on a surface of a glass material such that the glass material is difficult to be processed. A resin layer having a desired complicated surface shape made of a resin material is formed on the surface of the substrate. As an example, there is a method in which an aspherical resin film is formed on a surface of a glass member processed into a spherical shape, and an aspherical lens is formed by combining a glass material and a resin material. That is, in order to provide a lens whose aberration is corrected by a single lens, it is necessary to make the surface shape of the lens an aspherical shape. However, it is not easy to process a glass material into an aspherical shape. Since a lens using a resin that can be easily formed into a spherical shape does not easily gain the power of the lens, it is intended to take advantage of both advantages by combining the two. The lens manufactured in this manner is called a replica lens.

More specifically, as shown in FIG. 1, a bonding surface 30a which is one surface of a glass member 30 whose surface is processed into a spherical shape.
Next, a resin layer 32 made of a thin film of an active energy ray-curable resin is formed. The glass member 30 has a flange-shaped body portion 30b on the outer periphery thereof, and the body portion 30b is supported on the support member 14 in a state in which the body portion 30b is in contact with the upper end surface 14b of the support member 14. ing. This upper end surface 14b is used to form the surface shape of the resin material.
It protrudes from the edge of the molding surface 12b of the mold member 12 by a height h. The thickness h of the resin layer 32 is defined by the protrusion amount h (since the molding surface 12b has an aspherical shape,
The thickness of the resin layer varies depending on the location). And the mold member 1
By irradiating the liquid resin material filled in the space defined by the second molding surface 12b and the bonding surface 30a with an active energy ray, the resin material is cured,
The replica lens 33 is completed.

Hereinafter, the configuration of an apparatus for forming a replica lens will be described with reference to FIG. Reference numeral 10 denotes a mold member 12 for molding the resin layer 32.
And a substrate for holding a supporting member 14 for supporting the glass member 30 and the like, and is provided so as to extend horizontally. A mold member 12, a support member 14, a mold frame 16 and a chucking member 17 are supported on the upper surface of the substrate 10, and the chucking member 17 is An air cylinder 20 for relatively moving is provided.

More specifically, on the upper surface of the substrate 10, a mold 1 having a cylindrical concave portion 16a opened vertically upward in the center.
6 is fixed. A cylindrical support member 14 is fixed to the center of the cylindrical concave portion 16a. Inside the support member 14, a mold member 12 having an outer peripheral surface to be fitted with the inner peripheral surface of the support member 14 is provided. Is installed. And
The mold member 12 is also fixed to the mold 16 like the support member 14.

A cylindrical space 19 is formed between the outer wall of the support member 14 and the inner wall of the formwork 16, and a substantially cylindrical chucking member 17 is formed in the space 19. The inner peripheral surface and the outer peripheral surface of the lower fitting portion 17a are attached to the outer wall of the support member 14 and the inner wall of the formwork 16, respectively. And this chucking member 1
7, the fitting portion 17a is slidable along the axial direction (that is, along the vertical direction in the figure) while being guided by the outer wall of the support member 14 and the inner wall of the formwork 16.

Here, the upper part of the chucking member 17 is
The cylinder is divided into four equal parts, and each of the divided parts forms an arm portion 17b. Since the arm portion 17b is made thinner than the fitting portion 17a, the arm portion 17b can be bent inward and outward by the elasticity of the material forming the chucking member 17. Further, a claw portion 17c for chucking and positioning an outer peripheral surface of the glass member 30, which will be described later, is provided at a distal end portion of the arm portion 17b.

At the intermediate portion of the arm portion 17b, a projection 1 is provided.
7d are formed, and a protrusion 1
7e is formed, and the projection 17d is
Abuts against a cam surface 14d formed on the outer wall of the
e comes into contact with a slope 16g formed at the upper end of the formwork 16. Therefore, by sliding the chucking member 17 in the vertical direction with respect to the support member 14 and the mold 16, the four arm portions 17 b are connected to the cam surface 14 d and the slope 16
g, and the opening and closing operation of the claw portion 17c can be performed. That is, the chucking of the glass member 30 and the release of the chucking are performed by the vertical sliding of the chucking member 17.

On the other hand, an air cylinder 20 for vertically moving the chucking member 17 with respect to the support member 14 and the mold 16 is fixed to the lower surface of the substrate 10. The air cylinder 20 has a cylinder rod 2 on its upper part which moves relatively to the air cylinder body 20a.
0b, and a disc-shaped connecting member 22 for connecting the supporting member 17 is attached to the upper surface of the cylinder rod 20b.

At three places on the circumference of the upper surface of the connecting member 22,
The connecting rods 24A, 24B, 24C (only 24C is not shown) are fixed in an upright state. The upper ends of the connecting rods 24A, 24B, and 24C are formed at three places: through holes 10a, 10b, and 10c (only 10c is not shown) formed in the substrate 10; Hole 1
6c, 16d, and 16e (only 16e is not shown), it enters into the cylindrical concave portion 16a, and is connected to the lower fitting portion 17a of the chucking member 17.

Also, connecting rods 24A, 24B, 24 are provided between the lower surface 10d of the substrate 10 and the upper surface of the connecting member 22.
C, the compression springs 26A, 2
6B and 26C (only 26C is not shown) are arranged,
Thus, the connecting member 22 is urged in a direction in which the connecting member 22 is pressed down with respect to the lower surface 10d of the mold 10. Therefore,
In a state where the air cylinder 20 is not operated, the cylinder rod 20b and the connecting member 22 are pushed down by their own weight and the urging force of the compression springs 26A, 26B, 26C. It is located below the mold member 12 and the mold frame 16.
In this state, as shown in FIG.
The four claw portions 17c of No. 7 are in a closed state, and the outer periphery of the glass member 30 is chucked by the four claw portions 17c.

In this state, the glass member 3
Numeral 0 is held by the chucking member 17 in a state where the position of the optical axis exactly matches the center of the molding surface 12b of the mold member 12. On the other hand, when the air cylinder 20 operates and the connecting member 22 moves upward, the chucking member 1 is connected via the connecting rods 24A, 24B, 24C.
7 will be pushed upward. This allows
The four claws 17c of the chucking member 17 are opened as shown in FIG. 1, and the chucking state of the glass member 30 is released.

Since the molding surface 12b of the mold member 12 is processed into an aspherical shape required for the completed shape of the replica lens 33, the glass member 30 is placed on the upper end surface 14b of the support member 14. In this state, the resin material filled in the space defined by the bonding surface 30a and the molding surface 12b of the glass member 30 is cured, so that the glass member 3
The resin layer 32 to which the aspherical shape of the molding surface 12b has been transferred can be formed on the surface 0.

Here, as can be seen from the drawing, the protrusion amount h of the support member 14 defines the thickness of the resin layer 32 formed on the glass member 30. The value of the protrusion amount h is different depending on the degree of the aspherical surface of the molding surface 12b. At a position where the resin layer 32 is thinnest, the value of the resin layer 32 does not become thinner than, for example, 30 μm. Is set.

An escape portion 14c is formed at the upper end portion of the support member 14 for accommodating the protruding portion of the resin material, thereby preventing the protruded resin material from adhering to the support member 14. Glass member 30 and support member 1
4 prevents the resin material from protruding from the contact portion with the upper end surface 14b to form burrs. An irradiation device 34 for irradiating active energy rays is disposed above the glass member 30.
Thus, the resin layer 32 can be cured by irradiating the resin layer 32 with an active energy ray. The irradiation device 34 is supported by a moving mechanism 36, and can be retracted from the optical axis of the glass member 30 as necessary.

On the other hand, above the glass member 30, in addition to the irradiation device 34, a resin material supported by a moving mechanism 38 that can move between a position on the optical axis of the glass member 30 and a retracted position. A supply device 40 is arranged. This supply device 4
0 is a vertical lifting mechanism 4 held by the moving mechanism 38
2, a syringe 44 supported by the lifting mechanism 42,
A drive device 46 for driving the piston of the syringe 44 is provided. Then, a predetermined amount of the resin material is supplied to the molding surface 12b of the mold member 12 by the supply device 40.

Next, a procedure for molding a replica lens in the molding apparatus having the above-described configuration will be described. In forming the replica lens 33, first, the air cylinder 20 is operated, and the chucking member 17 is opened as shown in FIG.
A resin material is supplied to the molding surface 12b of the mold member 12. FIG.
FIG. 4 is a diagram showing a procedure of a supply operation of the resin material.

First, the moving mechanism 38 is operated to position the supply device 40 with respect to the mold member 12 such that the tip of the syringe 44 is located at the center of the molding surface 12b. FIG. 2A shows this state. From this state, the lifting mechanism 42 is operated as shown in FIG.
The syringe 44 is lowered so as to approach the molding surface 12b, and stopped just before the tip of the syringe 44 contacts the molding surface 12b. In this state, as shown in FIG.
The resin material is discharged little by little from the distal end of the syringe 44, and at the same time as the start of the discharge or after a predetermined time has elapsed from the start of the discharge, the syringe 44 is slowly raised as shown in FIG. The discharging operation of the resin material is continued even when the syringe 44 is raised, and the discharging operation is terminated when the supply amount of the resin material reaches a predetermined value. However, the discharge speed of the resin material and the rising speed of the syringe 44 at this time are
The speed is set such that the resin material is not interrupted between the molding surface 12b and the tip of the syringe 44. Thereafter, when the syringe 44 reaches a predetermined height, the operation of the elevating mechanism 42 is stopped.

As a specific example of the supply operation of this resin material, urethane-modified acrylate and an ultraviolet curable resin containing acrylate as a monomer component are used as the resin material, and the center of the glass lens having a diameter of 18 mm is formed on the surface. A case in which an aspherical resin layer having a thickness of 30 μm and a maximum thickness of 60 μm is formed (the volume of the resin material supplied at this time is 14 × 10 ⁻³ cc) will be described.

First, referring to FIG.
The height H1 from the molding surface 12b of the distal end of the is 44 mm, and the syringe 44 is moved from this position to V1 = 100 mm.
/ S, and the tip of the syringe 44 is
As shown in (b), the height H2 = 1.1 from the molding surface 12b.
Stop at the position of mm. Next, in the state shown in FIG. 2B, the resin material is started to be discharged from the syringe 44 at a speed of 3.5 × 10 ⁻³ cc / s, and as shown in FIG. When a resin material of 3.5 × 10 ⁻³ cc is discharged from the tip of the mold, and the resin material comes into contact with the molding surface 12b, the syringe 44 starts to slowly rise. The rising speed at this time is 0.2 mm / s. In the state where the syringe 44 is raised, FIG.
The discharging operation of the resin material is continuously performed as shown in FIG.
Four seconds after the start of the discharge of the resin material, the discharge of 14 × 10 ⁻³ cc, which is the appropriate supply amount of the resin material, ends.
At this time, the tip of the syringe 44 is at a height of 1.7 mm from the molding surface 12b, but thereafter, the ascending operation of the syringe 44 is continued, and the tip of the syringe 44 is 6 mm from the molding surface 12b. Stop at the position indicated by. afterwards,
The syringe 44 is raised at a high speed, returns to the same position as shown in FIG. 2A as shown in FIG. 2C, and ends the step of supplying the resin material.

The following two effects can be obtained by performing the above-described steps of supplying the resin material. (1) Since the resin material is brought into contact with the molding surface 12b in a ball-like state due to its surface tension without dropping the resin material from a high position above the molding surface 12b. It is possible to prevent air bubbles from being mixed into the resin material due to the shock of falling. (2) When the ejection is continued at a position close to the molding surface 12b, a ball of the resin material is formed so as to wrap the tip of the syringe 44 by the surface tension of the resin material. The resin material adheres to the portion, and the supply amount becomes inaccurate. On the other hand, when the distal end of the syringe 44 is raised as the ink is discharged, the resin material does not adhere to the distal end of the syringe 44, and the supply amount of the resin material can be accurately controlled.

Regarding (1), in the step of placing the glass member 30 on the support member 14 after the step of supplying the resin material, it is conceivable that air bubbles are mixed in the resin material. Therefore, in each step, it is extremely important to manage so that air bubbles are not mixed. Even if the air bubbles are of a degree that does not affect the optical performance, if air bubbles that can be visually confirmed are mixed in, it will not be possible to ship them as a product, thus improving the product yield. It is also important above.

Regarding (2), since the amount of the resin material filled between the bonding surface 30a and the molding surface 12b of the glass member 30 is extremely small, the amount of the resin material is precisely adjusted to a fixed amount. It is important to control In this regard, by adopting the above-described method, the volume of the supplied resin material can be accurately controlled to a constant amount. Here, for example, when the weight of the resin material is controlled at the time of supply, even if the weight is constant, the volume of the resin material greatly changes depending on the temperature and humidity. It is necessary to strictly control the temperature and the humidity in order to spread the resin material to all corners and prevent the amount of protrusion from increasing during 12b. Therefore, it is most preferable to control the supply amount of the resin material by volume.

When the supply of the resin material is completed, the moving mechanism 3
By operating 8, the supply device 40 is retracted from the optical axis of the glass member 30. In this state, as shown in FIG. 1, the glass member 30 having the coupling surface 30a coated with a coupling agent for preventing the resin layer 32 from peeling is placed on the upper end surface 14b of the support member 14. . At this time, the glass member 30 is carefully cautious so that the resin material spreads to every corner without being mixed with bubbles in the space defined by the bonding surface 30a of the glass member 30 and the molding surface 12b of the mold member 12.
Is placed.

At this time, it is not possible to control the amount of the resin material so that the resin material spreads to every corner of the space between the joining surface 30a and the molding surface 12b of the mold member 12 and does not protrude at all. , Actually impossible. for that reason,
A small amount of the resin material always protrudes from the edge of the molding surface 12b. If the protruding resin material adheres to the barrel portion 30b of the glass member 30, the replica lens 33 is inclined with respect to the optical axis of the lens barrel when the completed replica lens 33 is assembled into the lens barrel. It will be mounted, which will degrade optical performance. Therefore, the escape portion 30c of the resin material is provided between the outside of the effective ray diameter D and the body portion 30b so that the protruding resin material does not adhere to the body portion 30b. (See FIG. 5). The escape portion 30c is obtained by cutting the glass member 30 so as to form a steep slope upward from the extension surface of the bonding surface 30a of the glass member 30. Since the protruding resin material tends to move downward in accordance with gravity, the escape portion 30c is formed to have a steeply upward slope so that the resin material is prevented from sneaking into the body-attached portion 30b. it can.

An escape portion 14c is also formed at the upper end of the support member 14 to prevent the protruding resin material from adhering to the support member 14. When the operation of placing the glass member 30 on the support member 14 is completed, the moving mechanism 36 is operated to move the irradiation device 34 on the optical axis of the glass member 30. The resin layer 32 is irradiated with ultraviolet rays as active energy rays through the glass member 30. By this irradiation, the resin layer 32 starts to harden.

Here, in the replica lens, in order to ensure the optical performance of the completed lens, it is extremely important that the optical axis of the glass member 30 and the center of the molding surface 12b of the mold member 12 coincide with each other. In order to realize this, in the first embodiment, the glass member 30 is chucked by the chucking member 17 during the process of irradiating the ultraviolet rays as described above, so that the glass member 30 and the mold member are formed. 12
Are aligned.

In addition, not only UV-curable resins but also adhesives generally shrink in volume upon curing. That is, in the replica lens, the resin layer 32 contracts in the radial direction of the glass member 30. At this time, the resin layer 32 does not shrink toward the central axis of the glass member 30 due to a slight difference in the degree of shrinkage in each part of the resin layer 32, but shrinks around a position slightly shifted from the central axis. Will be done. Therefore, as the resin layer 32 cures, the glass member 30
Is applied to the mold member 12 by a small distance in the radial direction of the mold member 12.
The glass member 30 is moved against the chucking member 17 against this force.
If you hold the centered state chucked in
Between the glass member 30 and the resin layer 32 or between the mold member 12
Will be peeled off from the molding surface 12a. In order to solve this, in the first embodiment, the resin layer 3
Before the 2 is completely cured, the chucking state of the glass member 30 by the chucking member 17 is released again.

To explain this in one specific example, when the above-mentioned urethane-modified acrylate and an ultraviolet curable resin containing acrylate as a monomer component are used as the resin material, first, The center wavelength of the resin layer 32 is 365 n by the fluorescent lamp.
m of ultraviolet rays at an irradiation intensity of 30 mW / cm ² for 30 seconds. The irradiation energy amount per 1 cm ² by this first irradiation is 30 mW × 30 sec = 900 mWs
= 900 mJ, and the polymerization rate of the resin material at this time is:
As shown by a white circle on the graph showing the relationship between the irradiation energy and the polymerization rate in FIG. 4, it is about 70%. The viscosity of the resin material at this time is about 1300 to 1700 cps, and the resin layer 32 is hardened to some extent.
0 can be moved.

When the irradiation of the first stage is completed, the operation of the air cylinder 20 is released as shown in FIG. 3, and the outer peripheral portion of the glass member 30 is chucked by the chucking member 17 to form a glass member. The position of the optical axis 30 and the position of the center of the molding surface 12b of the mold member 12 are accurately matched. Thereafter, the resin layer 32 is irradiated with ultraviolet light having the same central wavelength of 365 nm by 100 mW / cm by using a high-pressure mercury xenon lamp as another light source in the irradiation device 34.
Irradiate at an illumination intensity of ² for 60 seconds. The irradiation energy amount per 1 cm ² by this second stage irradiation is 100 mW ×
60 sec = 6000 mJ, and the irradiation energy amount is 690 in total with the irradiation energy amount of the first stage.
It becomes 0 mJ. The polymerization rate corresponding to this irradiation energy amount is about 96%, as indicated by the black circles in FIG. 4, and is almost completely cured.

Here, when 20 seconds have elapsed since the start of the second stage irradiation, that is, the total irradiation energy amount with the irradiation energy amount of the first stage is 100 mW.
When x20 sec + 900 mJ = 2900 mJ, the chucking state of the glass member 30 by the chucking member 17 as shown in FIG. 1 is released again. At this time, the polymerization rate with respect to the irradiation energy amount is about 85%. In a state where the resin layer 32 is cured to a polymerization rate of about 85%, the glass member 30 no longer moves with respect to the mold member 12 due to the flexibility of the resin layer 32.
In the subsequent curing process, the glass member 30 moves only slightly in the radial direction of the mold member 12 with respect to the mold member 12 due to a slight difference in the contracted state of each part of the resin layer 32. However, since the amount of movement of the glass member 30 due to the difference in the contraction state of the resin layer 32 is extremely small, it does not lead to a decrease in the optical performance of the completed replica lens.

In centering the glass member 30 and the molding surface 12b, before the first stage irradiation is performed,
When the glass member 30 and the molding surface 12b are centered in a state where the resin material is not cured at all, since the resin material is still in a liquid state, when the glass member 30 moves,
It is conceivable that the resin material adhering to the surface of the glass member 30 has an irregular shape and protrudes from the edge of the molding surface 12b. When the resin material is cured in this state, the protruding resin material becomes thin film burrs,
Irregular and unstable burrs may result. Therefore, in the first embodiment, in order to prevent such unstable burrs from being formed, the centering is performed while the resin material is cured to some extent.

However, the degree of curing of the resin material by the first-stage irradiation is not limited to the above example, but may be changed before and after the value shown in the above example. If the above-mentioned problem of burr can be solved, the centering may be performed in a state where the resin material is not cured at all.
And, in practice, the viscosity of the resin material is from 100 cps to ¹ cps.
Be in the range of 0 ⁶ cps, it is possible to perform centering.

The replica lens 33 in which the resin layer 32 has been cured as described above is released from the mold member 12 and predetermined coatings (for example, antireflection coatings) are applied to the upper and lower surfaces to complete the replica lens 33. . FIG. 5 shows a completed shape of the replica lens 33. Next, a second embodiment of the first embodiment will be described below.

In the second embodiment, as a resin material, 38% by weight of urethane-modified polyester acrylate, ditrimethylolpropanetetrane, which is a type of resin material having a faster curing speed than the resin material used in the first embodiment. Using a liquid composition of 35% by weight of acrylate, 25% by weight of isobornyl acrylate, and 2% by weight of 1-hydroxycyclohexyl phenyl ketone, molding is carried out using exactly the same molding apparatus and mold member as in FIG.

First, the fluorescent lamp of the irradiation device 34
2 m of ultraviolet light having a center wavelength of 365 nm is applied to the resin layer 32.
Irradiate at an irradiation intensity of W / cm ² for 10 seconds. The irradiation energy amount per 1 cm ² by this first stage irradiation is 2 m
W × 10 sec = 20 mWs = 20 mJ, and the polymerization rate of the resin material at this time is about 90%. And the viscosity of the resin material at this time is about 50,000 cps,
The resin layer 32 is cured to some extent, but is in a state where the glass member 30 can be moved with respect to the mold member 12 when a force is applied from the outside.

When the irradiation of the first stage is completed, the operation of the air cylinder 20 is released as shown in FIG. The position of the optical axis 30 and the position of the center of the molding surface 12b of the mold member 12 are accurately matched. Thereafter, the resin layer 32 is irradiated with ultraviolet light having the same central wavelength of 365 nm by 100 mW / cm by using a high-pressure mercury xenon lamp as another light source in the irradiation device 34.
Irradiate at an illumination intensity of ² for 20 seconds. The irradiation energy amount per 1 cm ² by this second stage irradiation is 100 mW ×
20 sec = 2000 mJ, and the total irradiation energy amount with the first stage irradiation energy amount is 202
It becomes 0 mJ. The polymerization rate corresponding to this irradiation energy amount is about 97%, and is almost completely cured.

Here, when 5 seconds have passed since the start of the second stage irradiation, that is, the total irradiation energy amount with the irradiation energy amount of the first stage is 100 mW ×
When 5 sec + 20 mJ = 520 mJ, the glass member 3 by the chucking member 17 as shown in FIG.
The chucking state of 0 is released again. At this time, the polymerization rate with respect to the irradiation energy amount is about 95%. In a state where the resin layer 32 is cured to the polymerization rate of about 95%, the glass member 30 no longer moves with respect to the mold member 12 due to the flexibility of the resin layer 32, and the subsequent curing process Then, the glass member 30 only slightly moves in the radial direction of the mold member 12 with respect to the mold member 12 due to a slight difference in the contracted state of each part of the resin layer 32. However, the glass member 3 due to the difference in the contracted state of the resin layer 32
Since the movement amount of 0 is extremely small, it does not lead to a decrease in the optical performance of the completed replica lens.

According to the second embodiment, the irradiation time is 10 sec for the first stage and 20 sec for the second stage, for a total of 30 seconds.
sec, so that the molding time is shortened, which is advantageous for improving the production efficiency. Furthermore, the resin material used in the second embodiment has a viscosity of 10,000 to 10,000 after the first irradiation.
Since it is relatively high at 100,000 cps, irregular protrusion of the resin material when the glass member 30 is moved is less likely to occur.

Next, FIG. 6 shows an example of a lens barrel for mounting the replica lens. In FIG. 6, a lens barrel 48 includes the replica lens 33 described above.
The replica lens 33 is brought into contact with the
And a positioning portion 48a for defining the position in the direction along the optical axis. A relief portion 48b for accommodating the protruding resin material is formed in the resin relief portion 30c of the replica lens 33. The incident side of the lens barrel 48, that is, in front of the replica lens 33, has an inner diameter slightly larger than the effective diameter of the incident light, and prevents light from entering the escape portion 30c of the resin. Light-shielding portion 48c is provided.

As described above, the escape portion 48b for accommodating the protrusion of the resin material is provided in the lens barrel 48, and the light blocking portion 48c is provided in front of the light incident side, so that the replica lens 33 is connected to the lens mirror. In addition to being able to be accurately positioned with respect to the cylinder 48, undesired irregular reflection of light rays and irregular refraction of light rays caused by light rays entering a protruding portion of a resin material having an irregular surface shape. Can be prevented, and the deterioration of the image quality can be prevented.

In the above embodiment, the case of forming a replica lens having a convex surface has been described. However, the method of forming an optical element of the first embodiment is applicable to the case of forming a replica lens having a concave surface. Exactly the same is applicable. FIG. 7 shows a molding apparatus for molding a replica lens having a concave surface. This is the same as the molding apparatus shown in FIG. 1 except that the mold member 12 is replaced with a mold member corresponding to the concave surface. Only the other configuration and the molding operation thereof are exactly the same as those of the molding apparatus shown in FIG.

FIG. 8 shows the completed shape of a replica lens having a concave surface. Like the convex lens having a convex surface, the replica lens has a trunk portion and a relief portion for a resin material.
FIG. 9 is a view showing a lens barrel in which a replica lens having a concave surface is mounted. Just like the lens barrel 48 shown in FIG. 6, the positioning portion of the replica lens 33 and the resin that has overflowed are accommodated. And a light-shielding portion for preventing light rays from entering the resin protruding portion.

The conditions such as the discharge speed and the moving speed of the syringe when supplying the resin material to the mold member, and the conditions such as the irradiation intensity and the irradiation time when irradiating the ultraviolet rays are as shown in the above embodiment. Is a preferable example, and the conditions are not limited to the conditions described in the above embodiment. Further, the case where an ultraviolet ray-curable resin is used as the active energy ray-curable resin has been described, but an X-ray curable resin or an infrared ray-curable resin may be used.

In the above description, the resin material is supplied to the mold member, and then the glass member is mounted on the support member. However, if a hole for resin supply is formed in the mold member, the glass member can be mounted. After the placement, the resin material can be supplied to the space between the glass member and the mold member. Further, the resin may be supplied to the glass member instead of the mold member, and the glass member to which the resin is supplied may be placed on the support member.

Although the case where the replica lens is formed has been described, the method for forming the optical element of this embodiment is as follows.
As long as a resin layer is formed on the surface of a glass material, the present invention can be similarly applied to other types of optical elements. Also, the case where an air cylinder and a spring are used to move the support member up and down has been described.
Needless to say, it may be replaced by an elevating mechanism such as a combination of a stepping motor or a DC servomotor.

As described above, according to the optical element molding method and the molding apparatus of the first embodiment, when the resin layer has a predetermined viscosity, the glass member is moved so that its central axis is aligned with the central axis of the molding surface. It is possible to align the center axis of the glass member exactly with the center axis of the molding surface by positioning so that it exactly matches and then releasing this alignment state before the resin material is completely cured. However, there is an effect that separation of the resin layer can be prevented. (Second Embodiment) FIG. 10 is a view showing the structure of an optical element molding apparatus according to a second embodiment.

In FIG. 10, a lens body 133 is formed by forming an aspherical resin layer 132 on a bonding surface 130a of a glass member 130 having both surfaces processed into a convex spherical shape. What is called. Here, the resin layer 132 is obtained by curing an active energy ray-curable resin material. This lens body 13
The mold 111 for molding 3 is placed on a support substrate 110 which is supported in a state of being extended in a horizontal direction in a manufacturing apparatus main body (not shown) for manufacturing the lens body 133. Specifically, on the support substrate 110, a substantially cylindrical mold member 112 constituting a main part of the mold 111 is fixed with its central axis along a vertical line.
A molding surface 112 a for transferring a predetermined aspherical shape onto the surface of the resin layer 132 is formed on the upper end surface of the resin layer 132.

Outside the mold member 112, a substantially cylindrical support member 114 having an inner peripheral surface 114b fitted to the outer peripheral surface 112b of the mold member 112 is mounted. The support member 114 is formed such that the optical axis of the molding surface 112a (the center of the molding surface 112a passes through the molding member 112) with the inner peripheral surface 114b fitted to the outer peripheral surface 112b of the molding member 112. (The axis perpendicular to the surface 112a).

The glass member 130 is placed above the support member 114 with the joining surface 130 a of the glass member 130 separated from the molding surface 112 a of the mold member 112 by a distance that defines the thickness of the resin layer 132. A support portion 114a for supporting is formed so as to protrude circumferentially.
The upper end portion of the support portion 114a is processed into a knife edge shape, and when the support member 114 is rotated around the mold member 112 by the rotation drive motor 120 described later, the support member 114 is moved relative to the glass member 130. The resistance to the relative rotation is reduced.

The support portion 114a protrudes from the edge of the molding surface 112a of the mold member 112 by a protrusion amount h as shown in the figure, and the protrusion amount h defines the thickness of the resin layer 132. The value of this protrusion amount h
Although the thickness of the resin layer 132 is the smallest, the predetermined thickness (for example, 30 μ
m) It is set so as not to be thinner.

The gear portion 1 is provided below the outer peripheral surface 114 b of the support member 114 so as to surround the support member 114.
14c is formed. On the other hand, a rotation drive motor 120 is fixed to the lower surface of the support substrate 110 by a fixing member (not shown).
Reference numeral 21 protrudes from the upper surface of the support substrate 110 through a through hole 110a formed in the support substrate 110. A gear 122 is coaxially attached to the rotating shaft 121.
meshes with c. Therefore, by rotating the rotation drive motor 120, the support member 114 is moved to the molding surface 112.
It can be rotated around the optical axis a relative to the mold member 112.

Outside the support member 114, a cylindrical lid 116 having an inner peripheral surface 116b fitted to the outer peripheral surface 114b of the support member 114 and having an upper end sealed is mounted. The lid 116 is fitted with the inner diameter 116b of the outer peripheral surface 114b of the support member 114.
The support member 114 is rotatable around a central axis (coincident with the optical axis of the molding surface 112a) with respect to the support member 114, and is slidable along the axial direction. .

Further, on the upper surface of the lid 116, the lid 1
A hole 116c concentric with the inner peripheral surface 116b of the resin layer 132 is formed through the hole 116c.
Is irradiated with an active energy ray. In addition, this hole 11
The lower end of the inner peripheral surface of the glass member 6c abuts on a portion of the upper surface of the glass member 130 outside the effective beam diameter.
Part 1 for clamping the support on the support part 114a
16a are formed. The lower end of the clamp portion 116a is also formed like a knife edge like the upper end of the support portion 114a, and when the lid 116 is rotated around the support member 114 by a rotation drive motor 124 described later, The lid 116 is configured to reduce the resistance to rotation relative to the glass member 130.

Under the outer peripheral surface 116d of the lid 116,
A gear 116 e is formed so as to surround the lid 116. On the other hand, a rotation drive motor 124 is fixed to the lower surface of the support substrate 110 by a fixing member (not shown). The rotation shaft 123 of the rotation drive motor 124 is inserted through a through hole 110 b formed in the support substrate 110. And protrudes from the upper surface of the support substrate 110. A gear 126 is coaxially attached to the rotating shaft 123.
26 meshes with the gear 116 e of the lid member 116. Therefore, by rotating the rotation drive motor 124, the cover member 116 can be relatively rotated about the optical axis of the molding surface 112 a with respect to the support member 114.

Next, the procedure for molding the lens body 133 by the molding apparatus having the above-described configuration will be described with reference to FIGS. First, in FIG.
With the lid 116 and the glass member 130 removed from the support member 114, the resin material is applied to the molding surface 11 of the mold member 112.
2a. Here, the supplied resin material is an active energy ray-curable resin. Especially the lens body 133
As an active energy ray-curable resin material suitable for molding a resin, for example, an ultraviolet-curable resin (urethane-modified acrylate and a resin containing acrylate as a monomer component) is known.

Next, the glass member 130 is connected to the support member 114.
Place on top. Then, the glass member 130 is connected to the support member 11.
4, the bonding surface 1 of the glass member 130
30a is in contact with the upper end of the support portion 114a of the support member 114. In this state, the glass member 130 is positioned almost accurately with respect to the mold member 112 in the direction along the optical axis, but the glass member 130 is slightly inclined in the direction perpendicular to the optical axis. Therefore, the optical axis of the glass member 130 does not exactly coincide with the optical axis of the molding surface 112a.

When the glass member 130 is placed on the support member 114, the joining surface 130a of the glass member 130 spreads the resin material over the entire surface of the molding surface 112a. This loading step is carefully performed so that air bubbles do not enter the material. When the step of placing the glass member 130 on the support member 114 is completed, the lid 116 is then mounted so that the inner peripheral surface 116b of the cover 116 is fitted to the outer peripheral surface 114b of the support member 114.
At this time, the clamp 116a formed on the lower surface of the ceiling of the lid 116 abuts on the upper surface of the glass member 130 by its own weight, and clamps the glass member 130 on the support 114a. With the lid 116 attached to the support member 114 in this manner, the glass member 130
14a and the clamp portion 116a of the lid 116. Since the upper and lower surfaces of the glass member 130 are processed into a spherical shape, a centripetal force acts on the glass member 130 according to the magnitude of the radius of curvature of the surface, and the optical axis of the glass member 130 is considerably large. It exactly coincides with the optical axis of the molding surface 112a.

However, when the radius of curvature of both surfaces of the glass member 130 is large, the distance between the upper end of the support portion 114a and the lower surface of the glass member 130 and the distance between the upper surface of the glass member 130 and the lower end surface of the clamp portion 116a. Is larger than the centripetal force, and the optical axis of the glass member 130 may not exactly coincide with the optical axis of the molding surface 112a. FIG. 11 shows a state in which the optical axis of the glass member 130 and the optical axis of the molding surface 112a do not exactly match. In FIG. 11, the upper surface of the glass member 130 has a force F in a direction perpendicular to its tangent line due to the weight of the lid 116 as shown.
Receive. The vertical component of this force F is f1, which is substantially equal to the weight of the lid 116. Further, the horizontal component of the force F is f2, and the force for moving the glass member 130 in the direction indicated by the white arrow in the drawing, that is, the optical axis of the glass member 130 and the optical axis of the molding surface 112a. Acts as a centripetal force trying to match. Assuming that the static friction coefficient between the lower end of the clamp portion 116a of the lid 116 and the upper surface of the glass member 130 is μ _S , a static friction force μ _S F acts on the upper surface of the glass member 130 in a tangential direction. . The horizontal component force of the static friction force mu _S F is f3,
It works so as to prevent the glass member 130 from moving in the white arrow direction.

On the other hand, the lower surface of the glass member 130 receives a force F 'in a direction orthogonal to its tangent as a reaction force against the own weight of the lid 116 and the own weight of the glass member 130 as shown. Assuming that the vertical component of the force F 'is f1' and the weight of the glass member 130 is negligible with respect to the weight of the lid 116, f1 '= f1. The horizontal component of the force F 'is f2', which is a force for moving the glass member 130 in the direction indicated by the white arrow in the drawing, that is, the centripetal force, similarly to the component f2 acting on the upper surface of the glass member 130. Act as Also, the support portion 114 of the support member 114
Assuming that the static friction coefficient between the upper end of the glass member 130 and the lower surface of the glass member 130 is μ _S ′, a static friction force μ _S 'F' acts on the lower surface of the glass member 130 in the tangential direction. The horizontal component force of the static friction force μ _S 'F' is f3 ', and f3'
Similarly as described above, the glass member 130 functions to prevent the glass member 130 from moving in the white arrow direction.

Here, the magnitudes of the component forces f2 and f2 ', which are the centripetal forces, depend on the own weight of the lid 116 and the radius of curvature of the surface of the glass member 30, but the own weight of the lid 116 is constant. Therefore, as a result, these centripetal forces are
It is determined by the magnitude of the radius of curvature of the zero surface. On the other hand, the magnitudes of f3 and f3 ′, which are the static frictional forces that prevent the glass member 130 from moving in the centripetal direction, are determined by the lid 116.
Of its own weight and the static friction coefficient mu _S, 'is dependent on the, since the own weight of the cover 116 as mentioned above is constant, as a result, these static friction force static friction coefficient mu _S and μ _S' μ _S of It depends on the size.

Therefore, when the radius of curvature of the surface of the glass member 130 is large, the static frictional forces f3 and f3 'are larger than the centripetal forces f2 and f2', and the glass member 130 has a shape as shown in FIG. , The optical axis stays shifted from the optical axis of the molding surface 112a. In order to avoid such a state and to make the optical axis of the glass member 130 exactly coincide with the optical axis of the molding surface 112a, in the next step, the lid 116 is used.
Is mounted on the support member 114, and the rotary drive motor 1 is
The support member 114 and the lid 11 are rotated by rotating
6 is rotated around the optical axis of the molding surface 112a of the mold member 112. At this time, the rotation directions of the support member 114 and the lid 116 are opposite.

As described above, when the support member 114 supporting the glass member 130 and the lid 116 are relatively rotated, the gap between the upper surface of the glass member 130 and the clamp portion 116a is reduced.
In addition, slippage occurs between the lower surface of the glass member 130 and the support portion 114a. The occurrence of this slip causes the static friction force f acting on the glass member 130 up to that time.
3, f3 'changes to a kinetic friction force which is a fraction of the static friction force as shown in FIG. 12 (the kinetic friction coefficient is a fraction of the static friction coefficient, as is well known). The member 130 can easily move in the direction in which the centripetal force acts (the direction indicated by the white arrow) even with a small centripetal force f2, f2 '. Accordingly, even when the radius of curvature of the surface of the glass member 130 is large, the optical axis of the glass member 130 can be accurately matched with the optical axis of the molding surface 112a. Further, in this case, not only when the radius of curvature of the surface of the glass member 130 is large, but also when the radius of curvature is small,
The optical axis of 0 can be more accurately matched with the optical axis of the molding surface 112a.

When the process of centering the glass member 130 is completed, the lid 116 is then moved to the state shown in FIG.
The active energy ray is irradiated to the resin material through the hole 116c formed in the substrate to cure the resin material. At this time, when an ultraviolet-curable resin is used as the resin material, naturally, ultraviolet rays are irradiated as active energy rays. Then, after the curing of the resin layer 132 is completely completed, the lens body 133 is released from the mold 111, and the lens body 133 is completed.

In the above embodiment, the support member and the lid are rotated in opposite directions, but may be rotated in the same direction at different speeds. Also,
One of the support member and the lid may be fixed, and only the other may be rotated. Further, although the center of the glass member has been described before the resin material is irradiated with the active energy ray, the center may be adjusted after the resin material is cured to some extent. In that case, if the range viscosity of 10 ⁰ cps~10 ⁶ cps resin material, it is substantially possible to perform centering.

Although the case of molding a lens having a convex surface has been described, the method of molding an optical element of this embodiment can be applied to the case of molding a lens having a concave surface. . In that case, it is only necessary to replace the mold member shown in FIG. 10 with a mold member having a shape corresponding to the concave surface. Further, the case where an ultraviolet ray-curable resin is used as the active energy ray-curable resin has been described, but an X-ray curable resin or an infrared ray-curable resin may be used.

As described above, according to the method and the apparatus for molding an optical element of the second embodiment, the support member for supporting the glass member with respect to the mold member, and the glass member on the support member By relatively rotating the lid having a clamp portion for clamping the glass member, the glass member can easily move in the centripetal direction with respect to the centripetal force, so that the optical axis of the glass member and the optical axis of the forming surface are aligned. There is an effect that they can be matched exactly.

[0086]

As described above, according to the method and apparatus for molding an optical element of the present invention, when the resin layer has a predetermined viscosity, the center axis of the glass member is accurately aligned with the center axis of the molding surface. It is possible to align the center axis of the glass member with the center axis of the molding surface by releasing this alignment state before the resin material is completely cured, after that, while the resin material is completely cured. In addition, peeling of the resin layer can be prevented.

Further, by rotating a supporting means for supporting the glass member with respect to the mold means and a lid having a clamp portion for clamping the glass member on the supporting means, the relative rotation is achieved. Since the glass member easily moves in the centripetal direction with respect to the centripetal force, the optical axis of the glass member and the optical axis of the molding surface can be accurately matched.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a configuration of an optical element molding apparatus according to a first embodiment.

FIG. 2 is a view showing a procedure of a supply operation of a resin material.

FIG. 3 is a view showing a state in which a support member of the molding apparatus according to the first embodiment is released.

FIG. 4 is a diagram showing a relationship between an irradiation energy amount and a polymerization degree.

FIG. 5 is a diagram showing a completed shape of a replica lens having a convex surface.

6 is a diagram showing an example of a lens barrel to which the replica lens of FIG. 5 is attached.

FIG. 7 is a diagram showing a configuration of a molding device for a replica lens having a concave surface.

FIG. 8 is a view showing a completed shape of a replica lens having a concave surface.

9 is a diagram illustrating an example of a lens barrel in which the replica lens illustrated in FIG. 8 is mounted.

FIG. 10 is a view showing the structure of an optical element molding apparatus according to a second embodiment.

FIG. 11 is a view showing a state where the optical axis of the glass member does not coincide with the optical axis of the molding surface.

FIG. 12 is a diagram showing a state in which a static friction force has changed to a dynamic friction force.

[Explanation of symbols]

 Reference Signs List 10 substrate 12 mold member 14 support member 16 mold frame 20 air cylinder 22 connecting member 24 connecting rod 26 compression spring 30 glass member 32 resin layer 33 replica lens 34 irradiation device 36 moving mechanism 38 moving mechanism 40 supply device 42 elevating mechanism 44 syringe 46 Drive

────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-62-272203 (JP, A) JP-A-5-8231 (JP, A) JP-A-5-116154 (JP, A) (58) Survey Field (Int.Cl. ⁷ , DB name) B29C 39/10 B29C 39/22-39/44 B29C 33/12-33/22 B29D 11/00

Claims (12)

(57) [Claims] 1. A method for transferring a resin layer having a predetermined surface shape onto a surface of a glass member for transferring the predetermined surface shape.
By forming by molding using mold means having a shape surface, in order to form an optical element in which a glass material and a resin material are integrated, in a method of molding an optical element, on the molding surface of the mold means, Or on the surface of the glass member
A supply step of supplying the resin material, and a supporting portion for supporting a surface of the glass member at a distance that defines a thickness of the resin layer with respect to the molding surface, the glass member; a placing step of placing a resin material filled in a space defined between the molding surface and the surface of the glass member, when in a given viscosity,
Position if the said glass member, relative to said mold means, to align in a predetermined position in the direction along the plane substantially parallel to the forming surface
And Align step, while the resin material is cured to a predetermined degree of polymerization, a holding step of holding the glass member to the predetermined position, after the resin material is cured to a predetermined degree of polymerization, the holding of the glass member A releasing step of releasing the state. Wherein said aligning step, the viscosity of the resin material, when it is 10 ⁰ to 10 ⁶ cps, the molding of the optical element according to claim 1, characterized in that said glass member is positioned Method. 3. The positioning step includes: moving a positioning member slidably fitted to an outer peripheral surface of the support portion in an axial direction to perform a centripetal operation toward a center axis of the molding surface; 2. The method according to claim 1, wherein an outer periphery of the glass member is chucked, and a center axis of the glass member is positioned so as to coincide with a center axis of the molding surface. 3. 4. The optical element according to claim 1, wherein the releasing step releases the holding state of the glass member when the degree of polymerization of the resin material is cured to 80 to 95%. Molding method. 5. A method for transferring a resin layer having a predetermined surface shape onto a first surface of a glass member by transferring the predetermined surface shape.
By forming the molding using a mold means having a forming surface of the eye for forming an optical element that integrates the glass material and a resin material, the molding of an optical element, the molding surface of said mold means On or the first surface of the glass member
A supply step of supplying the resin material thereon, and contacting an outer peripheral portion of a first surface of the glass member, and separating the first surface from the molding surface by a distance that defines a thickness of the resin layer. A placing step of placing the glass member on a supporting portion for supporting the glass member in a state where the glass member is in contact with an outer peripheral portion of a second surface facing the first surface, and placing the glass member on the supporting portion. A mounting step of mounting a lid having a clamp portion for clamping on the supporting portion, and in a state where an outer peripheral surface of the supporting portion and an inner peripheral surface of the lid are fitted to each other, A rotating step of relatively rotating the support portion and the lid body. 6. The method according to claim 5, wherein the resin material is an active energy ray-curable resin. 7. A resin layer having a predetermined surface shape is formed on a surface of a glass member by molding.
An optical element molding apparatus for forming an optical element in which a glass material and a resin material are integrated, a molding surface for transferring the predetermined surface shape to the surface of the resin layer, and the glass member, Mold means having a support portion for supporting the surface of the glass member at a distance that defines the thickness of the resin layer from the molding surface; anda mold means, and the molding surface and the surface of the glass member. When the resin material filled in the space defined between is within a predetermined viscosity,
The glass member is positioned in a direction along a plane substantially parallel to the molding surface, and includes positioning means for releasing the positioning state when the resin material reaches a predetermined degree of polymerization, The positioning means has a fitting portion slidably fitted to the outer peripheral surface of the mold means, and in a state where the fitting portion is fitted to the outer peripheral surface of the mold means, in the axial direction of the mold means. A plurality of arms that open and close around the central axis of the molding surface by contacting the abutting portion with a cam surface provided on the mold means as the member moves, and provided at a tip of the arm portion. And a claw for chucking the glass member. 8. An optical element for forming an optical element in which a glass material and a resin material are integrated by forming a resin layer having a predetermined surface shape on a first surface of the glass member by molding. In the device molding device, a molding surface for transferring the predetermined surface shape to the surface of the resin layer is provided, and the optical axis of the molding surface is centered.
And type means having a cylindrical outer peripheral surface of the inner circumferential surface fitted to the outer peripheral surface of the mold means, the outside of the molding surface, is formed on a circumference around axis the optical axis, the glass A supporting portion for supporting the first surface of the member at a distance from the molding surface by a distance defining the thickness of the resin layer; and a cylindrical outer peripheral surface having the optical axis of the molding surface as a central axis. A fitting portion having an inner peripheral surface slidably fitted along the circumferential direction and the axial direction with the outer peripheral surface of the supporting device, and sealing an upper surface of the fitting portion. A ceiling portion, a clamp portion formed on a circumference around the optical axis of the molding surface on the lower surface of the ceiling portion as a central axis, and abutting on a second surface facing the first surface of the glass member; a lid unit having the the outer circumferential surface of the support means, in a state where the inner peripheral surface is fitted in the fitting portion of the cover means, said formation Around axis optical axis of the surface, forming apparatus of an optical element characterized by comprising a rotation drive means for relatively rotating said cover means and said support means. 9. The apparatus according to claim 8, wherein the clamp portion is formed at a position corresponding to an outer circumference of a beam effective diameter of the glass member. 10. The optical element molding apparatus according to claim 8, wherein the rotation driving means includes a first driving means for rotating the lid means. 11. An inner peripheral surface of said support means is provided with said mold means.
The optical element according to claim 8, wherein the optical element is slidable in a circumferential direction with respect to an outer peripheral surface of the optical element , and the rotation driving means includes a second driving means for rotating the support means. Molding equipment. 12. The optical element molding apparatus according to claim 8, wherein the resin material is an active energy ray-curable resin.