JP2859696B2 - Method and apparatus for manufacturing composite optical element - Google Patents

Description

Description: BACKGROUND OF THE INVENTION The present invention relates to a composite optical element comprising a substrate of an optical element formed of a glass or plastic material and a synthetic resin layer formed on the surface of the substrate. The present invention relates to a method and an apparatus for manufacturing the same.

[Conventional technology]

Conventionally, as a general method of manufacturing an aspherical lens, there is a so-called plastic lens manufacturing method in which a transparent thermoplastic resin is injected into a molding die and molded.

However, while the method can be mass-produced at low cost, sinking tends to occur during cooling after molding. For this reason, there is a defect that the optical characteristic accuracy varies, such as the focal length being out of order.

Therefore, as a manufacturing method for solving such a drawback, by setting a mold having a molding surface of a desired optical shape and a glass or plastic substrate with a curing resin interposed therebetween and curing the resin, the mold is formed on the substrate surface. A method for manufacturing a composite optical element in which a resin layer obtained by transferring a molding surface of the above-described method is screened has been developed and implemented.

According to such a manufacturing method, since the resin layer is a thin film, a change in the refractive index due to thermal expansion or heat is small, and furthermore, the occurrence of distortion or sink mark can be suppressed, and the non-uniformity of the optical characteristic accuracy does not vary. Spherical lenses can be mass-produced.

[Problems to be solved by the invention]

However, the position of the mold when the resin is spread in the optical element manufacturing apparatus is previously adjusted so that the distance between the base material receiving surface and the mold surface is constant. When the thickness of the resin layer changes due to variation and a certain amount of resin is discharged onto the surface of the base material, the outer diameter of the expanded resin greatly varies and cannot reach the effective diameter of the composite optical element, or the outer peripheral portion of the base material Until then, there was a drawback that the resin protruded.

Therefore, the present invention has been developed in order to solve the above-mentioned disadvantage, without being affected by variations in the thickness of the base material, it is possible to keep the expanded resin diameter constant, and to reduce the resin thickness It is an object of the present invention to provide a method and an apparatus capable of manufacturing a composite optical element to be kept constant.

[Means for solving the problem]

The present invention provides a method for manufacturing a composite optical element, in which a resin is placed on a base material of an optical element, and a mold is moved in an axial direction of the base material by a driving unit to form the composite optical element. And
A method of manufacturing a composite optical element, wherein molding is performed by controlling the position of the mold in the axial direction according to the measured value. Further, a resin is placed on the base material of the optical element, and the thickness of the base material is measured in a composite optical element manufacturing apparatus that performs molding by moving a mold in the axial direction of the base material by a driving unit. An apparatus for manufacturing a composite optical element, comprising: a displacement measuring device; and a control device that controls the axial position of the mold based on data from the displacement measuring device.

[Action]

According to the present invention, since the film thickness of the resin applied in a constant amount can be made constant, a composite optical element having a constant resin outer diameter can be manufactured without being affected by the thickness variation of the base material.

〔Example〕

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

(First Embodiment) FIG. 1 is a side sectional view partially showing an apparatus used for a molding method according to a first embodiment of the present invention.

The apparatus of the present invention comprises a molding device 1, a measuring device 2, and a control device 3.
It is composed of

The molding apparatus 1 includes a substantially U-shaped molding apparatus base 4.
The motor 5 is fixed to the upper part 4a of the motor, and the upper end of the ball screw 6 is rotatably attached to the motor 5. A belt 7 for transmitting a driving force is engaged between the motor 5 and the ball screw 6. A guide 8 is fixedly provided on the side of the molding apparatus base 4, and a table 9 and a mold base 10 are provided on the guide 8 so as to be slidable in the vertical direction. A ball screw 6 is attached to the table 9, and a cylinder 11 is fixedly provided on the lower surface. A rod 12 is fitted to the cylinder 11 so as to be movable up and down, and the tip of the rod 12 is attached to the upper surface of the mold base 10. Further, a stopper 13 is provided upright on the upper surface of the mold base 10, and the stopper 13 is loosely fitted to the table 9 so as to be vertically movable. A mold 14 is attached to the lower surface of the mold base 10. A holding table 15 is fixed on the upper surface of the base 4b of the molding apparatus base 4,
The holding table 15 determines and holds the position of the substrate 16 of the optical element.
The axis of the mold 14 is configured to move up and down on the same axis as the optical axis of the substrate 16. Below the base 4b of the molding apparatus base 4, a light source 17 for irradiating the resin placed on the base material 16 is provided.

The measuring device 2 has a substantially U-shaped measuring device base 18.
A drive cylinder 19 is fixedly provided on the lower surface of the upper portion 18a.
A guide 20 is fixedly provided on a side portion of the measurement device base 18, and a table 21 is provided on the guide 20 so as to be slidable in a vertical direction. The table 21 has a displacement measuring device 22 attached to it.
The rod end of the drive cylinder 19 is attached to the upper surface of the drive cylinder 19. A holding table 23 is fixed on the upper surface of the base 18b of the measuring device base 18, and the position of the base 16 is determined and held.

The control device 3 is connected to the motor 5 of the molding device 1 and the displacement measuring device 22 of the measuring device 2 by a cable.

In the molding using the apparatus having the above-described configuration, the base 16 made of glass or plastic whose outer periphery has been processed to a desired accuracy is placed on the holding table 23 of the measuring apparatus 2. Next, the displacement measuring device 22 is lowered by the driving cylinder 19 to measure the thickness of the base material 16, and the measurement result is taken into the control device 3. After the measurement is completed, the displacement measuring device 22 is raised by the drive cylinder 19, the base material 16 is taken out of the measuring device 2 by the transporting means (not shown), and an appropriate amount of resin is applied to the base material 16 by a fat and oil discharging device (not shown). The substrate 16 is placed on the holding table 15 of the molding apparatus 1 by a transporting means (not shown).

Next, by rotating the ball screw 6 with the motor 5 of the molding apparatus 1, the mold 14 is lowered to spread the resin applied to the molding surface of the base material 16. At this time, the thickness of the base material 16 measured in advance is processed by the control device 3, and the motor 5 is controlled so as to keep the distance between the forming surface of the base material 16 and the forming surface of the mold 14 constant. Thereafter, light is irradiated from the back surface of the base material 16 by the light source 17 to cure the resin spread in the shape of the mold 14. At this time, the resin shrinks slightly. In order to make the mold 14 follow this contraction, the mold 14 is lowered by the motor 5 while keeping the pressure applied to the resin in the cylinder 11 constant.

According to the present embodiment, since the molding device 1 and the measuring device 2 are separated, the thickness of the next substrate 16 can be measured during molding, and the molding time can be reduced. I can do it.

(Second Embodiment) FIG. 2 is a partially sectional side view showing an apparatus used for a molding method according to a second embodiment of the present invention.

Numeral 31 denotes a molding device, to which a holding table 33 is fixed on an upper surface of a base 32a of a molding device base 32 having a substantially concave shape. The holding table 33 determines and holds the position of the base material. Further, guides 35, are provided on the upper surface of the base 32a of the molding device base 32.
36 are fixed. Holding table at the top of guide 35
37 is provided slidably, and the holding table 37 has a discharge device
38 are attached. A cylinder 39 is fixed to a side portion 32b of the molding device base 32, and a rod end of the cylinder 39 is attached to a holding table 37.

On the other hand, a holding table 40 is slidably provided above the guide 36, and the non-contact displacement measuring device 41 is provided on the holding table 40.
Is attached. A cylinder 42 is fixed to the side portion 32c of the molding device base 32, and a rod end of the cylinder 42 is attached to a holding table 40.

A mold 43 for molding the base material 34 is held above a molding device base 32 by a vertically movable table (not shown) as in the first embodiment, and the axis of the mold 43 is aligned with the optical axis of the base material 34. It is configured to move up and down on the same axis.
A light source 44 for irradiating the resin placed on the base material 34 is provided below the base 32a of the molding device base 32. Further, a control device 45 is provided near the molding device base 32, and the control device 45 includes a displacement measuring device 41 and a motor (not shown).
And are connected by cable.

The molding using the apparatus 31 having the above-described configuration
A substrate 34 made of glass or plastic whose outer periphery has been processed to a desired accuracy is placed on 33. Next, the non-contact displacement measuring device 41 is fed out by the cylinder 42, and the thickness of the base material 34 is measured. After the measurement is completed, the non-contact displacement measuring device 41 is retracted by the cylinder. Thereafter, the ejection device 38 is fed out by the cylinder 39 to apply the resin to the base material 34. After the application of the resin is completed, the ejection device 38 is retracted by the cylinder 39.

Hereinafter, the operation is the same as that of the first embodiment, and the description of the operation will be omitted.

According to this embodiment, since the work is continuously performed on the same holding table 33 without transferring the base material 34 from the thickness measurement to the resin application or the resin application to the molding, the structure is simple. As well as shortening the tact time.
Further, the composite optical element can be manufactured with higher accuracy than in the first embodiment in which the base material is placed on separate holding tables for the thickness measurement and the molding. Furthermore, since the displacement measuring device 41 is not in contact, the thickness can be measured without causing any damage to the base material 34, and a high quality molded product can be obtained.

〔The invention's effect〕

As described above, according to the present invention, in manufacturing a composite optical element, the resin thickness can be made uniform without being affected by the thickness of the base material. Further, a composite optical element having a uniform outer diameter of the resin can be manufactured.

[Brief description of the drawings]

FIG. 1 is a partially cross-sectional side view showing an apparatus used for a molding method according to a first embodiment of the method and apparatus for manufacturing a composite optical element according to the present invention, and FIG. It is the side view which carried out the one part cross section which shows the apparatus used. 1,31 Molding device 2 Measuring device 3,45 Control device 4,32 Molding device base 5 Motor 6 Ball screw 7 Belt 8,20,35,36 Guide 9 , 21… Table 10… Mold base 11,39,42… Cylinder 12… Rod 13… Stopper 14,43… Mould 15,23,33… Holding base 16,34… Base 17 44 Light source 18 Measuring device base 19 Drive cylinder 22, 41 Displacement measuring device 37, 40 Holding table 38 Discharge device

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI // B29K 105: 24 B29L 11:00

Claims (2)

(57) [Claims] 1. A composite optical element manufacturing method in which a resin is placed on a base material of an optical element, and a mold is moved by a driving unit in an axial direction of the base material to form the composite optical element. A method of manufacturing a composite optical element, comprising: measuring and controlling the position of the mold in the axial direction according to the measured value. 2. A composite optical element manufacturing apparatus in which a resin is placed on a base material of an optical element and a mold is moved by a driving unit in an axial direction of the base material to perform molding, wherein the thickness of the base material is reduced. An apparatus for manufacturing a composite optical element, comprising: a displacement measuring device for measuring; and a control device for controlling the axial position of the mold based on data from the displacement measuring device.