JPH07124966A - Molding method of compound lens body, molding device and compound lens body made thereof - Google Patents

Abstract

PURPOSE:To realize the molding method, by which highly accurate compound lens body, can be formed the thickness of the resin layer of which does not vary, by a method wherein the scattering of the amount of resin is controlled by providing a notched groove part in glass member. CONSTITUTION:Glass member 1, which has an annular notched groove part 1a concentric to optical axis, is prepared and arranged at the predetermined position on molds 2 and 3 so as to be supported near the outer edge of the notched groove part 1a. At the same time, resin stock 5, the volume of which is slightly less than that occupied by the space made between the glass member 1 and the molds 2 and 3, is retained in the space just mentioned above so as to be solidified under the condition that small gap part 1d is left in the notched groove part 1a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a composite optical element, and more particularly to a method for manufacturing an aspherical lens used in an optical system of a camera, a printer, a copying machine, a facsimile machine or the like.

[0002]

2. Description of the Related Art In recent years, the mounting of aspherical lenses has been increasing in various optical systems in order to make them compact and highly functional. As the aspherical lens, a glass aspherical lens made by grinding, polishing or molding a glass material is known, but a composite aspherical lens is often used in terms of mass productivity and cost.

As a conventional method for molding this type of compound lens, an active energy ray-curable resin material is injected between a glass member and an aspherical mold, and then the glass member and the mold. After performing accurate alignment (gap adjustment and axis alignment), the active energy ray is radiated from the glass member side to cure the resin layer with the aspherical shape. . An ultraviolet curable resin material is widely used as the curable resin material, and ultraviolet light is widely used as the active energy ray.

[0004]

However, in such a conventional method of molding a compound lens, when a coaxial aspherical lens is manufactured, the mold and the glass member are mainly aligned with each other. Difficult, due to the reflected light on the mold surface,
The light intensity at the center of the lens surface increases and the curing becomes uneven,
Due to these two problems, an asymmetric component (as component) is likely to occur in the aspherical resin layer, and it is difficult to manufacture a lens with high precision.

As a means for solving these problems,
For example, a mold structure having a centripetal ring chuck (bell chuck) described in Japanese Patent Laid-Open No. 5-421, for example, is disclosed in Japanese Patent Laid-Open No. 4-161.
There have been proposed devices for making the light intensity distribution uniform at the center and outer periphery of the transfer surface by the light diffusing filter described in Japanese Patent No. 305.

However, in the one described in Japanese Patent Laid-Open No. 5-421, when the amount of injected resin varies, it is impossible to prevent uneven thickness, and in some cases, the resin layer does not reach the lens effective diameter. It is possible that it will not be reached. Further, in the one described in Japanese Patent Laid-Open No. 4-161305, it is necessary to prepare a filter individually depending on the curvature of the lens, and it is necessary to align the filter with the mold each time the curvature of the lens changes. As a result, not only the cost is increased, but also the work is complicated.

Therefore, the object of the present invention is to form a highly accurate compound lens body in which the thickness of the resin layer is uniform by adjusting the variation in the amount of resin material by providing the glass member with a notch groove portion. And

[0008]

To achieve the above object, the invention according to claim 1 uses a molding die to coat a resin layer on the surface of a glass member having a predetermined shape to form a glass member and a resin layer. A method of molding a compound lens body for forming a compound lens body, wherein a glass member having an annular cutout groove centered on an optical axis is prepared, and the glass member is near an outer edge of the cutout groove portion. The glass member is placed at a predetermined position on the molding die so as to be supported by, and a resin material slightly smaller than the space is housed in the space formed between the glass member and the molding die, and the notch is formed. The resin material is solidified by leaving a slight void in the groove, and the invention according to claim 2 is a molding apparatus for carrying out the method for molding a compound lens body according to claim 1. The molding die is a resin layer A transfer die for transferring a predetermined surface shape and a barrel die for movably holding it to define the outer peripheral surface of the resin layer are provided with a sensor for detecting the relative position between the barrel die and the transfer die. The invention according to claim 3 is characterized in that the resin layer is made of an active energy ray-curable resin material, and the invention according to claim 4 is the invention of the glass member. The diameter of the annular cutout groove is larger than the effective diameter of the lens, and is smaller than the diameter of the annular region in which the barrel die is in contact with the surface of the glass member. The present invention is a compound lens body manufactured by the method for molding a compound lens body according to claim 1, wherein the glass member has an annular void portion in the notch groove portion. .

According to a sixth aspect of the invention, a resin layer is packaged on the surface of a glass member having a predetermined shape by using a molding die, and the resin layer is cured by irradiation with active energy rays,
In a method of molding a composite lens body for forming a composite lens body in which a glass member and a resin layer are integrated, the active energy ray is transmitted through a liquid crystal encapsulating panel, and then the active energy ray curable resin material is irradiated. The invention according to claim 7 is characterized in that the liquid crystal encapsulation panel has a transmittance that can be changed with respect to the active energy ray, and the transmittance distribution of the active energy ray is changed. It is characterized in that it can be controlled arbitrarily, and
The invention described in the above is characterized in that the resolution of the liquid crystal sealed panel is 0.5 mm square or less per one display dot, and the invention in claim 9 is the composite according to claims 6 to 8. It is characterized by being manufactured by a method of molding a lens body.

Further, in the invention according to claim 10, the surface of the glass member having a predetermined shape is covered with a resin layer by using a molding die, and the resin layer is cured by irradiation with active energy rays, and the glass member and the resin are then cured. In a molding method of a composite lens body for forming a composite lens body in which layers are integrated, an optical system having positive or negative power is provided between an active energy ray source and the active energy ray curable resin material, The transfer surface of the molding die is characterized in that when the concave surface is a diffused light flux, when it is a convex surface, the active light ray is a convergent light flux, and the active energy ray-curable resin material is irradiated with the active energy ray. The invention according to claim 11 is characterized in that the focal length of the optical system is variable, and the invention according to claim 12 is manufactured by the method for molding a compound lens body according to claims 10 and 11. It is characterized in that it was.

[0011]

According to the first aspect of the invention, the glass member is provided with the annular notch groove portion. Therefore, the variation of the resin material amount is adjusted by the cutout groove portion, and the variation of the thickness of the resin layer does not occur. According to the invention of claim 2,
The barrel die and the molding die can be displaced relative to each other, and a distance between the barrel die and the molding die is detected by a sensor. Therefore, the thickness of the resin layer can be accurately controlled.

According to the third aspect of the invention, the resin material is cured by irradiation with active energy rays. Therefore, the complex lens body can be easily formed. In the invention according to claim 4, the notch groove portion is provided outside the lens effective diameter.
Therefore, the light ray effective area can be reliably ensured. According to the fifth aspect of the invention, the variation in the amount of the resin material is adjusted by the notch groove portion provided in the glass member, and the sensor detects the positional relationship between the barrel die and the molding die. Therefore, a compound lens body in which the thickness of the resin layer is accurately controlled can be obtained.

In the sixth aspect of the invention, the liquid crystal sealed panel is used as the intensity attenuation filter. Therefore, the irradiation intensity distribution of the active energy rays can be controlled regardless of the diameter and curvature of the molding die. According to the invention described in claim 7, the distribution of the active energy ray transmittance of the liquid crystal sealed panel can be arbitrarily controlled in display dot units of the liquid crystal cell. Therefore, the irradiation intensity distribution of the active energy ray on the resin material can be optimally adjusted.

In the invention described in claim 8, a liquid crystal sealed panel having a resolution of 0.5 mm square or less is used. Therefore, the intensity distribution of the active energy rays with which the resin material is irradiated can be finely controlled. According to the invention of claim 9, the irradiation intensity distribution of the active energy rays becomes uniform. Therefore, a compound lens body having a resin layer that is uniform and does not have uneven curing can be obtained.

According to the tenth aspect of the present invention, a luminous flux of active energy rays having a wavefront shape corresponding to the shape of the transfer surface of the molding die can be obtained. Therefore, the irradiation intensity distribution on the resin layer becomes uniform. According to the invention described in claim 11, even if the curvature of the transfer surface of the molding die changes, the curvature of the wavefront of the active energy ray can be changed by simple adjustment of the optical system. Therefore, proper activation energy ray irradiation can be easily performed.

According to the twelfth aspect of the invention, the irradiation intensity of the active energy rays is adjusted by the optical system, and then the resin material is irradiated. Therefore, uneven curing can be suppressed, and the loss of light amount of active energy rays can be reduced.

[0017]

Embodiments of the present invention will be described below in detail with reference to the drawings. <Embodiment 1> FIG. 1 is a view showing an embodiment of a molding method and a molding apparatus for a compound lens body according to the present invention.

First, the structure of the molding apparatus will be described. In FIG. 1A, reference numeral 1 is a glass member, and one surface 1b (first surface) thereof is provided with an annular cutout groove portion 1a outside the lens effective diameter. Reference numeral 2 denotes a body type, which is provided with a cylindrical fitting hole 2a having a diameter larger than the cutout groove portion 1a of the glass member 1 and smaller than the diameter of the glass member 1, and the end portion 2b of the fitting hole 2a is formed. It has a sharp circular ridge projecting from the base and is capable of supporting the first surface 1b of the glass member 1 in an annular line contact. Further, the body die 2 can movably hold the transfer die 3 through the fitting hole 2a. Transfer type 3
Has a transfer surface 3a of a predetermined shape on its upper surface, and its outer peripheral surface forms a cylindrical surface having substantially the same diameter as the fitting hole 2a of the barrel die 2 and fits into the fitting hole 2a of the barrel die 2. Can be relatively displaced with. Further, the lower end portion of the transfer mold 3 has a flange portion 3b. The clamp ring 4 has an opening 4a, and its opening end 4b has a sharp circular ridge. The clamp ring 4 is in line contact with the second surface 1c of the glass member 1 in an annular shape at the open end 4b, and can support the glass member 1 in cooperation with the barrel die 2. The opening end portion 4b and the end portion 2b of the barrel die 2 constitute a bell chuck structure, and the axis of the opening 4a of the clamp ring 4, the axis of the glass member 1 and the axis of the fitting hole 2a of the barrel die 2 are formed. It is possible to match with and coaxially chuck both. Resin layer 5
a is placed on the transfer surface 3a of the transfer mold 3, and a resin material (a predetermined amount is housed in a space surrounded by the transfer surface 3a, the first surface 1b of the glass member and the fitting hole 2a of the barrel mold 2) For example, an active energy ray-curable resin material 5 that is hardened by active energy rays is solidified by a molding die including a barrel die 2 and a transfer die 3. The outer peripheral surface of the resin layer 5 a is defined by the barrel mold 2. A sensor 6 is provided on the lower end surface of the body die 2, and the relative position between the body die 2 and the transfer die 3 can be detected as a displacement from a predetermined position. Also,
In FIG. 1 (b), an active energy ray source (not shown) is provided outside, and the active energy ray L emitted from the active energy ray source passes through the glass member 1,
The resin layer 5a can be cured. In this embodiment, ultraviolet rays are used as the active energy rays L and an ultraviolet curable resin is used as the resin material 5.
It is also possible to use infrared rays as and a thermosetting resin as the resin material 5.

Next, an operation of the molding method according to the present invention will be described together with an embodiment. First, a glass member 1 in which both surfaces of a glass material are processed into a predetermined axially symmetric shape is prepared, and an annular notch groove portion 1a is provided on the first surface 1b side of the glass member 1 by a known technique. Next, prepare the body mold 2,
The axis of the fitting hole 2a and the optical axis of the active energy ray L are aligned coaxially or substantially coaxially. Next, prepare the transfer mold 3,
The transfer mold 3 is fitted in the fitting hole 2a of the body mold 2, and a slightly smaller amount of the resin material 5 than the space formed between the glass member 1, the body mold 2 and the transfer mold 3 is transferred to the transfer mold 3. Drop onto the surface 3a. At this time, a sufficient space is provided between the end 2b of the barrel mold 2 and the transfer surface 3a, and a transfer mold support device (not shown) is used to prevent the resin material 5 from coming into contact with the glass member 1 in the next step. 3 is supported (FIG. 1 (a)). Next, the glass member 1 is cut out, and the side of the first surface 1b having the groove portion 1a is cut into
After being brought into contact with the end portion 2b of the glass member 1, the clamp ring 4 is brought into contact with the second surface 1c of the glass member 1 to sandwich the glass member 1 from both sides thereof. At this time, the opening end 4a of the clamp ring 4 and the end 2b of the barrel die 2 form a bell chuck structure, and the centripetal action of the bell chuck structure causes the axial center of the fitting hole 2a of the barrel die 2 and the opening of the clamp ring 4. The axis of the glass member 1 is aligned with the axis of the glass member 1, and the glass member 1 is supported near the outer edge of the cutout groove portion 1a. As a result, the glass member 1 and the transfer surface 3a are coaxial with each other, and both are coaxial with or substantially coaxial with the optical axis of the active energy ray L. When the glass member 1 is clamped and positioned,
The transfer mold 3 rises, and the resin material 5 is brought into contact with the first surface 1b of the glass member 1. The resin material 5 abutting on the first surface 1b of the glass member 1 fits the first surface 1b of the glass member 1, the transfer surface 3a of the transfer mold 3 and the body mold 2 as the transfer mold 3 rises. The space surrounded by the dowel hole 2a is filled with the resin material 5 and filled, and the resin layer 5a is left with a slight void 1d in the annular cutout groove 1a.
Are formed (FIG. 1 (b)). Simultaneously with this rising, the sensor 6 provided on the lower end surface of the barrel die 2 comes into contact with the flange portion 3b of the transfer die 3, whereby the relative positional relationship between the barrel die 2 and the transfer die 3 is detected. The position of the transfer mold 3 in the optical axis direction is controlled by a control device (not shown) based on the detection signal. That is, the first surface 1b of the glass member 1
Since the distance between the transfer layer 3a and the transfer surface 3a is controlled, the thickness of the resin layer 5a can be accurately controlled. If the positional relationship between the flange portion 3b of the transfer die 3 and the transfer surface 3a and the circumferential end surface of the end portion 2b of the body die 2 and the lower end surface of the body die 2 can be accurately grasped, the sensor Instead of 6, a simple stopper may be used.

In the formed resin layer 5a, the surplus resin material 5 flows into the cutout groove portion 1a of the glass member 1 and is accommodated therein (A portion in FIG. 1B). Therefore, the resin material 5
If the drop amount is set to a large amount by adding half the volume of the cutout groove portion 1a in advance, even if the drop amount varies within the range of half the volume of the cutout groove portion 1a, the variation is cut. It can be adjusted by the groove portion 1a, and the resin layer 5a can always have a predetermined thickness.

When the positioning of the transfer die 3 is completed, the transfer die is supported by the transfer die supporting device while maintaining the distance between the first surface 1b of the glass member 1 and the transfer surface 3a. Next, an active energy ray L is emitted from an active energy ray source (not shown), passes through the glass member 1, and then the resin layer 5
Irradiated with a, the resin 5 is cured and solidified. After the resin material 5 is solidified, the transfer mold 3 is relatively separated from the body mold 2 to perform mold release.

As described above, in this embodiment, even if the amount of the resin material 5 to be dropped varies, it can be adjusted by the notched groove portion 1a provided in the glass member 1, and the resin layer 5a can be adjusted.
It is possible to mold a highly accurate compound lens body having no variation in thickness. Further, by providing the sensor 6,
Since the relative positional relationship between the barrel mold 2 and the transfer mold 3 in the optical axis direction can be detected, the thickness of the resin layer 5a can be accurately controlled, and a highly accurate compound lens body can be molded.

Further, in this embodiment, since the resin material 5 is cured by irradiation with the active energy ray L, the compound lens body can be easily molded, and it is inexpensive and suitable for mass production. Further, since the cutout groove portion 1a of the glass member 1 is formed outside the lens effective diameter, it does not affect the effective light flux.

Since the compound lens body is molded by the molding method and the molding apparatus as described above, the compound lens body in which the thickness of the resin layer 5a is accurately controlled can be molded, and the highly accurate compound lens body can be manufactured. <Embodiment 2> FIG. 2 is a view showing an embodiment of a molding method and a molding apparatus for a compound lens body according to Embodiment 6 of the present invention. In each of the following examples,
The same components as those described above are designated by the same reference numerals, and detailed description thereof will be omitted.

First, the structure of the molding apparatus will be described. Figure 2
In (a), the liquid crystal sealed panel 10 has two liquid crystal cells inside.
They are arranged in a three-dimensional matrix and are arranged between an active energy ray source (not shown) and the resin layer 5a.
Reference numeral 11 denotes a liquid crystal driver for driving the liquid crystal enclosure panel 10. A control device 12 controls the liquid crystal driver 11 for each display dot of the liquid crystal cell to control the liquid crystal sealed panel 10.
This is for arbitrarily changing the transmittance distribution of. Reference numeral 13 denotes a support device for holding the liquid crystal encapsulation panel 10 at a predetermined distance from the resin layer 5a. 15 is a glass member. In this embodiment, the liquid crystal enclosure panel 10 has a resolution (size of liquid crystal cell) of 0.5 mm square or less, and more specifically, a resolution of 50 to 200 dpi is used. FIG. 2B is a diagram schematically showing an example of the transmittance distribution of the liquid crystal sealed panel 10, and the density of black dots in the drawing and the transmittance are substantially inversely proportional.

Next, the operation will be described together with one embodiment of the molding method according to the present invention. First, the barrel mold 2 is prepared, and the optical axis of the active energy ray L and the shaft center of the fitting hole 2a are coaxially or substantially coaxially aligned. Next, the transfer mold 3 is prepared, the transfer mold 3 is fitted into the fitting hole 2a of the body mold 2, and the predetermined amount of the resin material 5
Is dropped on the transfer surface 3 a of the transfer mold 3. At this time, the body mold 2
A sufficient space is provided between the end 2b of the sheet and the transfer surface 3a, and the transfer die 3 is supported by a transfer die supporting device (not shown) so that the resin material 5 does not come into contact with the glass member 1 in the next step. . Next, after a predetermined surface of the glass member 15 is brought into contact with the end portion 2b of the barrel mold 2, the clamp ring 4 is brought into contact with the other surface of the glass member 15 and the glass member 15 is sandwiched from both surfaces thereof.
At this time, the opening end 4a of the clamp ring 4 and the end 2b of the barrel die 2 form a bell chuck structure, and the centripetal action of the bell chuck structure causes the axial center of the fitting hole 2a of the barrel die 2 and the opening of the clamp ring 4. The axis of 4a and the axis of the glass member 15 can be matched. Thereby, the glass member 15 and the transfer surface 3a
The axes of and coincide with each other, and the axes of both are coaxial or substantially coaxial with the optical axis of the active energy ray L. When the glass member 15 is sandwiched and positioned, the transfer mold 3 rises and the resin material 5 is brought into contact with a predetermined surface of the glass member 15. The resin material 5 that is in contact with the predetermined surface of the glass member 15 is surrounded by the predetermined surface of the glass member 15, the transfer surface 3a of the transfer mold 3 and the fitting hole 2a of the body mold 2 as the transfer mold 3 rises. Fill the filled space with the resin material 5,
The resin layer 5a is formed. When the positioning of the transfer die 3 is completed, the transfer die 3 is supported by the transfer die supporting device while maintaining the gap between the predetermined surface of the glass member 15 and the transfer surface 3a.

Next, the liquid crystal encapsulation panel 10 is placed between the active energy ray source and the resin layer 5a, and is supported by the supporting device 13. The liquid crystal cell inside the liquid crystal sealed panel 10 is
The transmittance distribution is controlled by the liquid crystal driver 11 controlled by the controller 12 in display dot units (FIG. 2 (b)).
(See), the optical axis of the transfer surface 3a and the axial center are aligned. When the liquid crystal encapsulation panel 10 is ready, the active energy ray L is emitted from the active energy ray source, and the intensity and the distribution thereof are changed by the liquid crystal encapsulation panel 10 and then transmitted through the glass member 15 to the resin layer 5a. Reach and cure the resin layer 5a. Next, an active energy ray L is emitted from an active energy ray source (not shown), and the glass member 1
After passing through, the resin layer 5a is irradiated and the resin layer 5a is cured. After the resin material 5 has hardened, transfer the transfer mold 3 to the body mold 2.
The mold release is performed by separating the mold relative to each other.

By the way, FIGS. 3 to 5 show a conventional technique, in which 21 is a glass member, 22 is a barrel type, and 23 is a transfer type.
Reference numeral 23a is a transfer surface, 24 is a clamp ring, 25 is a resin material, 31 is a filter, 32 is a driving device, 33 is an active energy ray source, 38 is a small light diffusion region, and 39 is a large light diffusion region. Are shown respectively. As shown in FIG. 3, conventionally, the active energy ray L from the active energy ray source 33 irradiates a luminous flux which is a mere diffused luminous flux or a substantially parallel luminous flux from a direction coaxial with the axis of the glass member 21. Since the transfer surface 23a of the transfer die 23 is usually finished to have the same or similar surface roughness as a mirror surface, the reflected light on the transfer surface 23a causes the boundary between the glass member 21 having a large difference in refractive index and the air. By repeating internal reflection on the surface 21a and the transfer surface 23a (see FIG.
(a)), the intensity distribution of the active energy ray L applied to the resin layer 5a was significantly uneven (FIG. 5).
(b)). As means for solving this inconvenience, Japanese Patent Laid-Open No. 4-1
As disclosed in Japanese Patent No. 61305, there is proposed a method using a filter 31 made of an acrylic substrate whose transmittance is changed in two steps in the radial direction (FIG. 5).

However, in this method, it is necessary to separately prepare the filter 31 for each shape of the transfer surface 23a of the transfer mold 23, and there is a drawback that the labor and cost for manufacturing the filter 31 are large. In addition, the filter 31 and the transfer surface 23
It also has a problem that it is difficult to accurately define the positional relationship with a and make it coaxial. That is, the intensity distribution of the active energy rays L applied to the resin layer 5a becomes asymmetric, causing uneven curing of the resin layer 5a, and the molded resin lens surface has an asymmetric component (as component), which is high. The drawback is that it is difficult to mold an accurate compound lens body.

Therefore, the present invention proposes a method of arbitrarily changing the intensity distribution of the active energy rays L by using the liquid crystal enclosure panel 10 to solve the above-mentioned drawbacks. That is, by inserting the liquid crystal encapsulation panel 10 between the active energy ray source and the resin layer 5a and controlling the liquid crystal cells arranged in a two-dimensional matrix in display dot units, the transmittance distribution is transferred to the transfer surface 3a. To change the intensity distribution of the active energy ray L optimally according to the shape of
The strength of the active energy ray L applied to the resin layer 5a is made uniform over the entire transfer surface 3a. Therefore, the entire surface of the resin layer 5a can be uniformly cured, and uneven thickness due to uneven curing does not occur.
A highly precise compound lens body can be molded.

Further, since the liquid crystal cell can be controlled in XY coordinates in display dot units, the coordinate center of the transmittance distribution and the transfer surface 3 can be controlled.
The axial center of a can be easily aligned, the intensity distribution of the active energy ray L does not become asymmetric with respect to the transfer surface 3a, and a highly accurate compound lens body can be molded. further,
In this embodiment, since the liquid crystal enclosure panel 10 has a resolution of 0.5 mm square or less per display dot, the transmittance distribution of the active energy rays can be changed finely and smoothly, and the curing can be performed finely. By preventing unevenness, it is possible to mold a highly accurate compound lens body.

<Third Embodiment> An example of the above-mentioned prior art (FIG. 4).
Then, the active energy ray L is transferred to the transfer surface 23a and the glass member 21.
It has been described that the intensity distribution of the active energy rays L applied to the resin layer 25 becomes remarkably non-uniform due to multiple reflection at the boundary surface 21a with the air, but the reflectance of the transfer surface 23a is not so high. In the case, or if the resin layer 25 is thick enough,
The reflection on the transfer surface 23a becomes dominant only once at the beginning,
Subsequent internal reflection has little effect on the intensity distribution (Fig. 6). Therefore, this embodiment proposes a method of reducing the secondary reflection.

FIG. 7 is a diagram showing a molding method and a molding apparatus for a compound lens body according to a third embodiment of the present invention. First, the configuration of the molding apparatus will be described. In the figure, reference numeral 40 denotes a light flux adjusting lens system (optical system), which is arranged between an active energy ray source (not shown) and the resin layer 5a. The light flux adjusting lens system 40 is composed of a concave lens 40a and a convex lens 40b, and has positive or negative power as a whole. The positional relationship C between the concave lens 40a and the convex lens 40b can be arbitrarily changed steplessly. Further, the positional relationship B between the convex lens 40b and the glass member 15 can also be arbitrarily changed in a stepless manner.

Next, the operation will be described together with an embodiment of the molding method according to the present invention. First, the barrel mold 2 is prepared, and the axis of the fitting hole 2a is aligned with the optical axis of the active energy ray L. Next, the transfer mold 3 is prepared, the transfer mold 3 is fitted into the fitting hole 2a of the barrel mold 2, and a predetermined amount of the resin material 5 is dropped on the transfer surface 3a of the transfer mold 3. At this time, a sufficient space is provided between the end portion 2b of the barrel die 2 and the transfer surface 3a, and transfer is performed by a transfer type supporting device (not shown) so that the resin material 5 does not contact the glass member 1 in the next step. Support the mold 3. Next, after a predetermined surface of the glass member 15 is brought into contact with the end portion 2b of the barrel mold 2, the clamp ring 4 is brought into contact with the other surface of the glass member 15 and the glass member 15 is sandwiched from both surfaces thereof. At this time, the opening end 4a of the clamp ring 4 and the end 2b of the body mold 2 are
Constitutes a bell chuck structure, and by its centripetal action, the axis of the fitting hole 2a of the barrel die 2, the axis of the opening 4a of the clamp ring 4 and the axis of the glass member 15 can be aligned with each other. . As a result, the glass member 15 and the transfer surface 3a are aligned with each other in axis, and the optical axis of the active energy ray L is aligned. When the glass member 15 is sandwiched and positioned, the transfer mold 3 rises and the resin material 5 is brought into contact with a predetermined surface of the glass member 15. The resin material 5 that is in contact with the predetermined surface of the glass member 15 is surrounded by the predetermined surface of the glass member 15, the transfer surface 3a of the transfer mold 3 and the fitting hole 2a of the body mold 2 as the transfer mold 3 rises. The filled space is filled with the resin material 5, and the resin layer 5a is filled.
Is formed. When the positioning of the transfer die 3 is completed, the transfer die 3 is supported by the transfer die supporting device while maintaining the gap between the predetermined surface of the glass member 15 and the transfer surface 3a.

Then, the light flux adjusting lens system 40 is arranged between the active energy ray source and the resin layer 5a. First, the light flux adjusting lens system 40 arranged is aligned with the optical axis of the active energy ray L. After that, the light flux adjusting lens system 40
By changing the positional relationship C between the concave lens 40a and the convex lens 40b in the optical axis direction and the positional relationship B between the convex lens 40b and the glass member 15 in the optical axis direction, which form the transfer surface 3 of the transfer mold 3.
When a is a concave surface, a diffused light flux can be emitted, and when the transfer surface 3a is a convex surface, a convergent light flux can be emitted. That is, the light flux adjusting lens system is adjusted so that the transfer surface 3a can be irradiated with the active energy ray from the substantially normal direction. When the molding apparatus is ready in this way, the active energy ray L is emitted from the active energy ray source, and the light flux adjusting lens system 40
Thus, the light flux is changed into a wavefront shape corresponding to the shape of the transfer surface 3a. The active energy ray L whose wavefront shape is changed to a diffused light flux or a convergent light flux passes through the glass member 1 and then is irradiated onto the resin layer 5a from a direction substantially normal to the transfer surface 3a to cure the resin layer 5a. Let After the resin layer 5a is cured, the transfer mold 3 is relatively separated from the body mold 2 to perform mold release.

That is, in the present invention, the focal length of the light flux adjusting lens system 40 and the distance between the light flux adjusting lens system 40 and the resin layer 5a are changed in consideration of the shape of the glass member 15 so that the transfer surface 3a can be formed. Therefore, the active energy ray L can be irradiated from a substantially normal direction, and the active energy ray L having a uniform intensity distribution can be applied to the resin layer 5a. Therefore, the resin layer 5a having no unevenness in curing can be formed, and a highly accurate compound lens body can be molded. Further, by adjusting the focal length of the light flux adjusting lens system 40, the irradiation intensity distribution of the active energy rays L on the transfer surface 3a can be adjusted arbitrarily and steplessly, so that delicate adjustment can be easily performed. In this embodiment, the convex lens 40b having positive power is used in the light flux adjusting lens system 40 to obtain the diffused light flux, but the same effect can be obtained by replacing the convex lens 40b with negative power.

Further, according to the present method, since light is not shielded unlike a filter, the light amount loss of the active energy ray L can be suppressed to an extremely low level.

[0038]

According to the invention described in claim 1, since the variation in the amount of the resin material is adjusted and adjusted by the notch groove portion provided in the glass member, the thickness of the resin layer does not vary, and the high An accurate compound lens body can be molded. According to the second aspect of the present invention, since the positional relationship between the barrel mold and the transfer mold can be detected, the thickness of the resin layer can be accurately controlled, and a highly accurate compound lens body can be molded.

According to the third aspect of the present invention, the resin material is cured by the irradiation of the active energy ray, so that the complex lens body can be easily molded and can be mass-produced at low cost. According to the invention of claim 4, since the notch groove portion is provided outside the lens effective diameter of the glass member,
A highly accurate compound lens body can be molded without adversely affecting the effective light flux.

According to the fifth aspect of the present invention, the variation in the amount of resin material is adjusted by the notched groove portion of the glass member, and the sensor detects the positional relationship between the barrel die and the transfer die. The thickness can be accurately controlled, and a highly accurate compound lens body can be obtained. According to the invention described in claim 6, since the liquid crystal sealed panel is used as the strength changing filter, it is not necessary to separately prepare a dedicated filter depending on the diameter of the transfer mold and the shape of the transfer surface, and the cost can be easily increased at low cost. A precise compound lens body can be molded.

According to the invention described in claim 7, since the irradiation intensity distribution of the active energy rays can be arbitrarily controlled, the resin layer can be uniformly cured, and a highly accurate compound lens body having no thickness unevenness can be formed. can do. According to the invention described in claim 8, since the intensity distribution of the active energy rays with which the resin layer is irradiated can be finely and smoothly controlled, a resin layer having no uneven curing can be formed, and a highly accurate compound lens body is molded. be able to.

According to the ninth aspect of the present invention, since the intensity distribution of the active energy rays with which the resin layer is irradiated is controlled to be uniform, it is possible to form a resin layer without unevenness of curing, and a highly accurate compound lens. You can get the body. According to the invention of claim 10, since the resin layer is irradiated with the active energy ray having a wavefront shape corresponding to the surface shape of the transfer surface, a resin layer having no unevenness of curing can be formed, and a highly accurate compound lens body can be formed. Can be molded.

According to the eleventh aspect of the present invention, since the focal length of the optical system can be easily changed, it is possible to deal with transfer surfaces of various shapes, and the complex lens body can be easily and inexpensively molded. be able to. According to the invention of claim 12, the intensity distribution of the active energy rays with which the resin layer is irradiated becomes uniform, so that a resin layer without uneven curing can be formed, and a highly accurate compound lens body can be obtained.

[Brief description of drawings]

FIG. 1 is a configuration and state explanatory view of an embodiment of a method and apparatus for molding a compound lens body according to claims 1 to 5, in which (a) shows a state of a preparatory stage and (b) shows curing. The inside states are shown.

FIG. 2 (a) is a configuration diagram of an embodiment of a molding apparatus for carrying out the method of molding a compound lens body according to the invention of claims 6 to 9, and FIG. 2 (b) is a transmittance distribution of a liquid crystal encapsulation panel. It is a schematic diagram.

FIG. 3 is a configuration diagram of an example of a method of molding a compound lens body according to a conventional technique.

FIG. 4A is an explanatory diagram of the state of internal reflection,
(b) is a schematic diagram of the intensity distribution.

5A is a configuration diagram of a conventional molding apparatus for a compound lens body using a filter, and FIG. 5B is a schematic explanatory diagram of a transmittance distribution thereof.

FIG. 6 is an explanatory diagram of a problem showing a state of primary reflection on a transfer surface.

FIG. 7 is a configuration diagram of an embodiment of a molding apparatus for carrying out the compound lens body molding method according to the invention of claims 10 to 12;

[Explanation of symbols]

 1, 15 ... Glass member 1a ... Notch groove portion 1d ... Void portion 2 ... Body mold (molding die) 3 ... Transfer mold (molding die) 3a ... Transfer surface 4 ... Clamp ring 5 ... Resin material 5a ... Resin layer 6 … Sensor 10… Liquid crystal enclosure panel 40… Flux control lens system (optical system)

Claims (12)

[Claims] 1. A method of molding a composite lens body, comprising forming a composite lens body in which a glass member and a resin layer are integrated with each other by coating a resin layer on the surface of a glass member having a predetermined shape using a molding die. A glass member having an annular cutout groove centered on the optical axis is prepared, and the glass member is arranged at a predetermined position on the molding die so that the glass member is supported near the outer edge of the cutout groove. At the same time, a small amount of resin material is accommodated in the space formed between the glass member and the molding die, and the resin material is solidified by leaving a slight void in the cutout groove. And a method of molding a compound lens body. 2. A molding apparatus for carrying out the method of molding a compound lens body according to claim 1, wherein the molding die transfers a predetermined surface shape to a resin layer, and a transfer die is movably held. The molding apparatus for a compound lens body according to claim 1, further comprising a sensor for detecting a relative position between the cylinder mold and the transfer mold, the cylinder mold defining the outer peripheral surface of the resin layer. 3. The method of molding a compound lens body according to claim 1, wherein the resin layer is made of an active energy ray-curable resin material. 4. The diameter of the annular cutout groove portion of the glass member is larger than the lens effective diameter, and smaller than the diameter of the annular region where the barrel die contacts the surface of the glass member. The method for molding a compound lens body according to claim 1. 5. A compound lens body manufactured by the method for molding a compound lens body according to claim 1, wherein the glass member has a notched groove portion with an annular void portion. body. 6. A compound lens in which a glass member having a predetermined shape is covered with a resin layer by using a molding die, and the resin layer is cured by irradiation with an active energy ray to integrate the glass member and the resin layer. In the method of molding a composite lens body for forming a body, after the active energy ray is transmitted through the liquid crystal encapsulation panel, the active energy ray-curable resin material is irradiated and cured, Molding method. 7. The compound lens according to claim 6, wherein the liquid crystal encapsulation panel has a transmittance that can be changed with respect to the active energy ray, and the transmittance distribution of the active energy ray can be arbitrarily controlled. Body shaping method. 8. The method of molding a compound lens body according to claim 7, wherein the liquid crystal sealed panel has a resolution of 0.5 mm square or less per display dot. 9. A composite lens body manufactured by the method for molding a composite lens body according to claim 6. 10. A compound lens in which a glass member having a predetermined shape is covered with a resin layer by using a molding die, and the resin layer is cured by irradiation with active energy rays to integrate the glass member and the resin layer. In a method of molding a complex lens body for forming a body, an optical system having positive or negative power is provided between an active energy ray source and the active energy ray curable resin material, and the transfer surface of the molding die is A method for molding a compound lens body, comprising irradiating the active energy ray-curable resin material with an active energy ray of a diffused light flux when the surface is concave and a convergent light flux when the surface is convex. 11. The method of molding a compound lens body according to claim 10, wherein the focal length of the optical system is variable. 12. A composite lens body manufactured by the method for molding a composite lens body according to claim 10.