JP2019166780A - Apparatus, method, and program for manufacturing composite lens, and mold for manufacturing composite lens - Google Patents

Abstract

To control the thickness of a resin lens in a high precision in an apparatus, a method, and a program for manufacturing a composite lens, and a mold for manufacturing a composite lens.SOLUTION: Using a mold 20 for manufacturing a composite lens provided with a transfer surface MS having a reversed shape of an optical surface of a resin lens, and an abutting part 12C being a protruded part provided around the transfer surface MS, and for regulating the thickness of a resin lens between the transfer surface MS and an optical surface LS of a base lens L by allowing a part of the optical surface LS of the base lens L to be abutted, a plane perpendicular to an optical axis of the transfer surface MS of the mold 20 is detected as a reference surface. The base lens L is placed on the abutting part 12C of the mold 20 so that a part of the optical surface LS formed by a spherical surface of the base lens L is abutted, the position of the base lens L is adjusted, and a plane perpendicular to an optical axis of the base lens L is adjusted in parallel with the reference surface MP.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a base lens and a composite lens manufacturing apparatus, method, program and mold for manufacturing a composite lens having a resin lens provided on the optical surface of the base lens.

  As an optical lens for a camera, a video camera, or a projector, a compound lens including a base lens and a resin lens made of a resin layer laminated on one or both optical surfaces of the base lens may be used. . Various manufacturing apparatuses for manufacturing such a compound lens have been proposed (see, for example, Patent Documents 1 to 3).

  In the compound lens manufacturing apparatus described in Patent Document 1, a mold for molding a resin lens is installed in a barrel mold so as to be movable up and down, and a resin layer (depending on the distance between the spherical surface of the base lens and the mold) The thickness of the resin lens) is defined.

  In the method for manufacturing a composite lens described in Patent Document 2, a support surface provided on a support member having an inner peripheral surface that fits with an outer peripheral surface of a mold member outside a mold member for molding a resin lens, and a glass base The thickness of the resin layer is defined by contacting a height determining surface provided on the material. Further, the optical axis is positioned by fitting the outer peripheral surface of the body portion of the glass substrate to the inner peripheral surface of the positioning portion of the support member.

  In the compound lens manufacturing apparatus described in Patent Document 3, a mold is accommodated in an upper plate and a lower plate coupled via a height adjusting washer, and the height of the upper plate with respect to the lower plate is adjusted by a height adjusting washer. By adjusting, the thickness of the resin layer (resin lens) is adjusted.

Japanese Patent Laid-Open No. 9-24522 JP-A-5-318500 JP 2006-142722 A

  In the method of Patent Document 1, there is a possibility that a thickness error occurs in the resin lens depending on the position control accuracy of the body mold and the mold. Similarly, in the method of Patent Document 3, there is a possibility that a thickness error occurs in the resin lens depending on the position control accuracy by the adjustment washer.

  In the method of Patent Document 2, the resin lens depends on the surface accuracy of the support surface of the support member and the height determining surface of the glass substrate, and the radial accuracy of the inner periphery of the positioning portion of the support member and the outer periphery of the barrel portion of the glass substrate. And the optical axis of the resin lens and the glass substrate may be displaced.

  Further, in the methods of Patent Documents 1 to 3, since the mold and the body mold, the supporting member, or the plate are separate bodies, there is a risk that dust may adhere between them when being attached or detached. Mixing of dust into the resin is undesirable because it leads to a reduction in lens accuracy and a reduction in lens manufacturing yield.

  The present invention has been made in view of the above circumstances, and in a composite lens in which a resin lens is laminated on a base lens, the optical axes of the base lens and the resin lens are precisely matched, and the thickness of the resin lens The purpose of this is to improve the yield with high precision.

An apparatus for producing a compound lens according to the present invention comprises:
An apparatus for producing a compound lens having a base lens whose optical surface is spherical and a resin lens laminated on the optical surface of the base lens,
A transfer surface having an inverted shape of the optical surface of the resin lens, and a convex portion provided around the transfer surface, and a part of the optical surface of the base lens is abutted against each other so that the transfer surface and the base lens are A mold for producing a composite lens, provided with an abutting portion that defines the thickness of the resin lens between the optical surface;
A mold holder for holding the mold;
A first detection unit that detects, as a reference plane, a plane perpendicular to the optical axis of the transfer surface of the mold installed in the mold holding unit;
A base lens mounting mechanism for mounting a base lens on the abutting portion of the mold;
An apparatus for manufacturing a compound lens, comprising: an adjustment unit that adjusts the position of the base lens so that a plane perpendicular to the optical axis of the base lens is parallel to the reference plane detected by the first detection unit. .

“Vertical” includes not only strictly vertical but also vertical with a certain degree of error of, for example, ± 1 minute, that is, ± 1/60 degrees.
“Parallel” includes not only strictly parallel but also includes being parallel with a certain error of, for example, ± 1 minute, that is, ± 1/60 degrees.

  In the compound lens manufacturing apparatus of the present invention, the adjustment unit detects the inclination of the plane perpendicular to the optical axis of the base lens with respect to the reference plane, and the inclination detected by the second detection unit. It is preferable to include a moving unit that moves the base lens according to the above.

  In the compound lens manufacturing apparatus of the present invention, the second detection unit causes light to enter and reflect the parallel plane mirror placed on the base lens so that the surface is perpendicular to the optical axis of the base lens. It is preferable to detect the inclination with respect to the reference plane.

  “Parallel plane mirror” means a mirror formed on one plane of a parallel plane substrate.

  In the composite lens manufacturing apparatus of the present invention, the mold may have a flat portion perpendicular to the optical axis of the transfer surface.

  In the compound lens manufacturing apparatus of the present invention, the first detection unit causes light to enter and reflect the parallel plane mirror placed on the abutting portion of the mold so as to be on the optical axis of the transfer surface of the mold. A vertical plane may be detected.

  In the compound lens manufacturing apparatus of the present invention, the mold has a mirror surface on the flat surface, and the first detection unit causes the light to enter and reflect on the mirror surface so that the optical axis of the transfer surface of the mold It is also possible to detect a plane perpendicular to.

  In the compound lens manufacturing apparatus of the present invention, the transfer surface of the mold may be an aspherical surface.

The method for producing a compound lens of the present invention is a method for producing a compound lens having a base lens whose optical surface is a spherical surface, and a resin lens provided on the optical surface of the base lens,
A transfer surface having an inverted shape of the optical surface of the resin lens, and a convex portion provided around the transfer surface, and a part of the optical surface of the base lens is abutted against each other so that the transfer surface and the base lens are Prepare a mold for producing a compound lens with an abutting part that defines the thickness of the resin lens between the optical surface,
A plane perpendicular to the optical axis of the transfer surface of the mold is detected as a reference plane,
Supply resin to the transfer surface of the mold,
Place the base lens on the abutting part of the mold,
In this method, a resin lens is molded by adjusting the position of the base lens so that a plane perpendicular to the optical axis of the base lens is parallel to the reference plane.

  In the method for producing a composite lens of the present invention, a base lens having a plane portion perpendicular to the optical axis of the base lens may be used as the base lens on the surface opposite to the surface on which the resin lens is provided.

The composite lens manufacturing program of the present invention is a manufacturing program for causing a computer to execute a manufacturing method of a composite lens having a base lens whose optical surface is a spherical surface and a resin lens laminated on the optical surface of the base lens. There,
A transfer surface having an inverted shape of the optical surface of the resin lens, and a convex portion provided around the transfer surface, and a part of the optical surface of the base lens is abutted against each other so that the transfer surface and the base lens are A procedure for detecting a plane perpendicular to the optical axis of the transfer surface of a mold for producing a compound lens having a butting portion that defines the thickness of the resin lens with the optical surface as a reference surface;
A procedure for supplying resin to the transfer surface of the mold;
The procedure of placing the base lens on the abutting part of the mold,
This is a composite lens manufacturing program that causes a computer to execute a procedure of adjusting a position of a base lens so that a plane perpendicular to the optical axis of the base lens is parallel to a reference plane.

The mold for producing a compound lens of the present invention is a mold for producing a compound lens having a base lens whose optical surface is a spherical surface and a resin lens laminated on the optical surface of the base lens,
A transfer surface having an inverted shape of the optical surface of the resin lens, and a convex portion provided around the transfer surface, and a part of the optical surface of the base lens is abutted against each other so that the transfer surface and the base lens are It is a metal mold for manufacturing a compound lens provided with an abutting portion that defines the thickness of the resin lens between the optical surface.

The mold for producing a composite lens of the present invention may have a plane parallel to a plane perpendicular to the optical axis of the transfer surface.
In this case, it is preferable to have a mirror surface on the plane.

  In the composite lens manufacturing apparatus and manufacturing method of the present invention, a transfer surface having an inverted shape of the optical surface of a resin lens, and a convex portion provided around the transfer surface, which is a part of the optical surface of the base lens Is used, and a mold for manufacturing a composite lens is used that includes an abutting portion that defines the thickness of the resin lens between the transfer surface and the optical surface of the base lens. Therefore, the thickness of the resin lens can be easily made constant, and manufacturing variations in the resin thickness can be suppressed. In addition, a plane perpendicular to the optical axis of the mold transfer surface is detected as a reference plane, resin is supplied to the mold transfer surface, and a base lens is placed on the abutting portion of the mold. By adjusting the position of the substrate and making the plane perpendicular to the optical axis of the base lens parallel to the reference surface, the optical axis of the base lens can easily coincide with the optical axis of the transfer surface of the mold Can do. Therefore, the manufacturing variation of the resin lens can be suppressed, and the cost and time for adjusting the misalignment can be reduced. As a result, the manufacturing cost of the compound lens can be reduced.

1 is a schematic configuration diagram of a compound lens manufacturing apparatus according to an embodiment of the present invention. Schematic block diagram showing the configuration of the control device Top view (a) of mold and side view (b) including partial cross section Diagram showing the relationship between the optical axis of the mold and the optical axis of the base lens Diagram showing the relationship between the optical axis of the mold and the optical axis of the base lens Cross-sectional view of compound lens including axial misalignment and tilting Cross-sectional view of a compound lens without axial misalignment and tilting The flowchart which shows the process performed in embodiment of this invention The flowchart which shows the process performed in embodiment of this invention The flowchart which shows the process performed in embodiment of this invention Schematic diagram showing the state when detecting the reference surface of the mold Schematic diagram for explaining lens parallel adjustment processing Schematic diagram for explaining lens parallel adjustment processing Diagram for explaining molding of resin lens Schematic diagram at the time of tilt measurement for the mold 110 of the design change example Schematic diagram at the time of tilt measurement for the base lens L2 of the design change example The figure which shows the film thickness variation of the resin lens in the compound lens manufactured with the manufacturing apparatus of this embodiment The figure which shows the film thickness variation of the resin lens in the compound lens manufactured with the conventional manufacturing device

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic configuration diagram of a complex lens manufacturing apparatus according to a first embodiment of the present invention. In FIG. 1, a part of the cross section is shown.

  The compound lens manufacturing apparatus 1 (hereinafter simply referred to as the manufacturing apparatus 1) according to the first embodiment manufactures a compound lens in which a resin lens is laminated on the convex optical surface LS of a base lens L. It is. And the manufacturing apparatus 1 forms the resin lens which consists of a resin layer using curable resin containing radical photopolymerization initiator and a thermal radical polymerization initiator.

  The base lens L is a spherical lens whose optical surface LS is a spherical surface. The base lens L has a light-transmitting property for curing the curable resin and a stability that does not cause deformation that affects optical performance by irradiation light or heating for curing the curable resin. Considering this, a glass lens can be preferably used. In addition, as long as the above light transmittance and stability are satisfied, a resinous lens can be used as the base lens L. As the base lens L, for example, a lens having a diameter of about 25 mm to 200 mm can be used, but is not limited.

  The manufacturing apparatus 1 includes a mold 10 for manufacturing a composite lens for laminating a resin lens on a base lens L, a mold holding unit 20 that holds the mold 10, an inclination of the mold 10, and an inclination of the base lens L. A tilt detecting unit 30 for detecting the base lens, a base lens holding unit 40 for holding the base lens L, a first moving unit 50 for moving the base lens L in the vertical direction, and a second for moving the mold 10 in the vertical direction. And a control device 70 for controlling the inclination detecting unit 30, the base lens holding unit 40, the first moving unit 50, and the second moving unit 60. The mold 10, the mold holding unit 20, the tilt detection unit 30, the base lens holding unit 40, the first moving unit 50, and the second moving unit 60 may be housed in a chamber (not shown). .

The base lens holding unit 40, the first moving unit 50, and the second moving unit 60 constitute a base lens mounting mechanism for mounting the base lens on the mold.
The tilt detection unit 30 is a first detection unit that detects a plane perpendicular to the optical axis MA of the transfer surface MS of the mold 10 installed in the mold holding unit 20 as a reference plane MP. It is the 2nd detection part which detects the inclination with respect to the reference plane MP of a plane perpendicular | vertical to the optical axis LA.

  Moreover, although the manufacturing apparatus 1 is provided with the resin supply part which supplies curable resin, the light irradiation part which irradiates light to curable resin, and the heating part which heats curable resin, in order to make description simple. In FIG. 1, these are omitted. In FIG. 1, the left-right direction of the paper surface is the X direction, the direction orthogonal to the paper surface is the Y direction, and the vertical direction of the paper surface is the Z direction. Here, the XY direction is the horizontal direction, and the Z direction is the vertical direction.

  The mold 10 includes a transfer surface MS having an inverted shape of the optical surface of the resin lens to be formed, and a convex portion 12 provided around the transfer surface MS. In FIG. 1, the vicinity of the transfer surface MS of the mold 10 is a partial cross-sectional view. Details of the mold 10 will be described later.

  The mold holding unit 20 is a plate-like member on which the mold holding unit 20 is placed at the time of molding the resin lens. The mold holding unit 20 can be moved vertically up and down by the first moving unit 50.

  For example, the tilt detection unit 30 is configured to cause a laser beam to enter the target surface as measurement light and receive the reflected light to detect the tilt of the target surface. For example, an autocollimator is suitable as the inclination detection unit 30. The inclination detection unit 30 is installed in the manufacturing apparatus 1 after being adjusted so that the optical axis of the measurement light coincides with the substantially vertical direction (that is, the Z direction).

  The manufacturing apparatus 1 includes a parallel plane mirror 35 and a mirror mounting mechanism 38 that mounts the parallel plane mirror 35 on the mold 10 and the base lens L. The mirror mounting mechanism 38 has a gripping part that can grip the parallel plane mirror 35, and moves it onto the mold 10 or the base lens L while holding the parallel plane mirror 35. Alternatively, it is placed on the base lens L to release the grip. The tilt detection unit 30 makes laser light incident on the parallel plane mirror 35 and detects the tilt of the parallel plane mirror, that is, the tilt of the mold 10 or the base lens L by detecting the tilt of the optical axis of the reflected light. Is detected. The mirror mounting mechanism 38 is controlled by the control device 70.

  Although the manufacturing apparatus 1 of the present embodiment includes the parallel plane mirror 35 and the mirror mounting mechanism 38, they may not be included in the manufacturing apparatus, and the parallel plane mirror 35 is manually operated by a mold or a substrate. You may make it mount on a lens.

  The base lens holding unit 40 includes a base plate 41 and a holding frame 42 for the base lens L.

  The base plate 41 is disposed horizontally, and an opening 41a is formed at the center thereof. In FIG. 1, the vicinity of the opening 41 a of the base plate 41 is a partial cross-sectional view. Here, the diameter of the opening 41 a is larger than the diameters of the base lens L and the mold 10.

  The holding frame 42 is disposed, for example, at three positions around the opening 41a at intervals along the edge of the opening 41a, and holds the edge of the base lens L from three sides around by a known driving mechanism. The base lens L sandwiched by the holding frame 42 is held with the optical surface LS facing downward. The optical surface LS is exposed through the opening 11a. Note that the holding frame 42 functions as a moving unit when the base lens L is placed on the mold 10 and adjusted to be parallel to the base lens L mold. The holding frame 42 is driven by the drive unit 45 to hold and adjust the position of the base lens L. The drive unit 45 is controlled by the control device 70.

  The base lens holding unit 40 can be moved vertically and horizontally by the second moving unit 60.

  In addition, as the 1st moving part 50 and the 2nd moving part 60, well-known arbitrary mechanisms, such as a mechanism by a ball screw and a pulse motor, can be used, for example.

  The control device 70 includes a computer having a CPU (Central Processing Unit), a semiconductor memory, a hard disk, and the like. And the manufacturing program of this invention is installed in the hard disk, and the manufacturing method of a compound lens is performed by a manufacturing program.

  FIG. 2 is a schematic block diagram showing the configuration of the control device. As shown in FIG. 2, the control device 70 includes a reference setting unit 71 and a lens position adjustment processing unit 72.

  The reference setting unit 71 instructs the inclination detection unit 30 to detect a plane MP perpendicular to the optical axis MA of the transfer surface MS of the mold 10 as a reference surface. Here, the inclination detection unit 30 detects the inclination of the plane MP from the horizontal, and detects the plane MP as a reference plane (hereinafter also referred to as the reference plane MP).

  The lens position adjustment processing unit 72 instructs the tilt detection unit 30 to start from a reference plane MP on a plane perpendicular to the optical axis of the base lens L (hereinafter referred to as a plane LP of the base lens L). Detect the slope of. The lens position adjustment processing unit 72 further supports the holding frame 42, and the base lens so that the plane LP of the base lens L is parallel to the reference plane MP according to the detected inclination. Move L.

  Note that the reference plane MP and the plane LP of the base lens L are not actual surfaces but virtual surfaces. In this specification, “the base lens is parallel to the mold” means that the plane LP of the base lens is parallel to the reference plane MP.

  Here, details of the mold 10 will be described. FIG. 3 shows a top view (a) of the mold 10 and a side view (b) with a partial cross section. FIG. 3B shows a state in which the base lens L is installed on the mold 10.

  The mold 10 has a transfer surface MS formed at one end (here, the upper end) of a cylindrical body portion 14, and includes a convex portion 12 around the transfer surface MS. Here, the transfer surface MS is a region corresponding to the light ray effective area EA of the optical surface of the resin lens, and the convex portion 12 is a portion that is convex with respect to the transfer surface MS. The convex portion 12 is not limited to a convex portion erected with respect to the transfer surface MS, and may be a convex portion that is formed so as to continuously increase in gradient on the transfer surface MS.

  As shown in FIG. 3, in the mold 10, the convex portion 12 is provided in an annular shape so as to surround the transfer surface MS, and the inner peripheral corner portion 12 </ b> C is a part of the optical surface LS of the base lens L. The abutting portion to which the LSP is abutted is configured. A straight line connecting the corner portions 12C (hereinafter also referred to as the butting portions 12C) as the butting portions is located in one plane, and the plane is perpendicular to the optical axis MA of the transfer surface MS. is there. That is, in the mold 10, the abutting portion 12 </ b> C is formed such that when a parallel plate is placed, the plane of the parallel plate is perpendicular to the optical axis MA of the transfer surface MS.

  In this example, the convex portion 12 is provided in an annular shape along the circumference of the transfer surface MS, but the mold 10 is represented by a broken line in FIG. 3A instead of the annular convex portion. As shown, a plurality of isolated convex portions 12A may be provided.

  The optical surface LS of the base lens L is regulated by the abutting portion 12C, and the transfer surface MS and the optical surface LS are separated at a predetermined interval. The distance between the transfer surface MS and the optical surface LS is the thickness of the resin lens RL. Thus, in the mold 10, the abutting portion 12 </ b> C is a resin lens between the transfer surface MS and the optical surface LS of the base lens L by the part LSP of the optical surface LS of the base lens L being abutted. It functions as what defines the thickness of L. Note that the portion LSP that is abutted against the abutting portion 12C of the optical surface LS of the base lens L is a part of the peripheral edge portion that becomes the non-light ray effective region in the compound lens.

  As described above, since the mold 10 includes the abutting portion 12C that defines the thickness of the resin lens between the transfer surface MS and the optical surface LS of the base lens L, the resin lens having a predetermined thickness can be accurately obtained. Can get well. Therefore, compared to the case where the mold is moved in the conventional barrel mold and the thickness of the resin lens is regulated by controlling the position of the barrel mold and the mold, the thickness can be regulated only by the mold without the barrel mold. If the present mold 10 is used, the thickness error of the resin lens can be easily suppressed. In addition, when the body mold and the mold are separate members, dust may be generated when they are attached and detached. However, since they are integrated, the generation of dust can be suppressed.

  In addition, by using this mold 10, the base lens L can be easily placed on the mold 10 so that the optical axis MA of the transfer surface MS and the optical axis RA of the base lens L coincide with each other. Can do. This principle will be described. The optical axis MA of the transfer surface MS of the mold 10 is an axis that coincides with the optical axis RA of the resin lens RL to be molded. Accordingly, the optical axis MA of the transfer surface MS of the mold 10 and the optical axis LA of the base lens L are matched, that is, the optical axis LA of the base lens L and the optical axis RA of the resin lens RL are matched. It is synonymous with that.

  4 is a diagram showing a state in which the optical axis MA of the mold 10 and the optical axis LA of the base lens L are inclined, and FIG. 5 shows the optical axis MA of the mold 10 and the optical axis LA of the base lens L. It is a figure which shows the state which matched.

  As shown in FIGS. 4 and 5, the base lens L is installed on the mold 10 in a state where a part of the optical surface LS composed of the spherical surface is abutted against the abutting portion 12 </ b> C. As shown in FIG. 4, when the base lens L is installed on the mold with the optical axis LA of the base lens L inclined with respect to the optical axis MA of the transfer surface of the mold, naturally, However, the plane LP perpendicular to the optical axis LA of the base lens L has an inclination with respect to the plane MP perpendicular to the optical axis MA. Then, when the curable resin is cured in this state, as shown in FIG. 6, the molded product is a compound lens in which axial misalignment occurs between the base lens and the resin lens, and at the same time the axial collapse occurs. End up. Here, the axis collapse means that the optical axis LA and the optical axis LM are not parallel but have an inclination. Here, the axial misalignment is an axial misalignment that can occur even when the optical axis LA and the optical axis LM are parallel.

  On the other hand, as shown in FIG. 5, if the optical axis LA of the base lens L is not inclined with respect to the optical axis MA, the optical axis center position is not displaced. Since the optical surface LS of the base lens L that is abutted against the abutting portion 12C of the mold is a spherical surface, if the inclinations of the optical axis LA and the optical axis MA are matched, the axial deviation can be eliminated at the same time. When the curable resin is cured in this state, as shown in FIG. 7, a composite lens having no axial displacement and no axial collapse between the base lens L and the composite lens can be obtained as a molded product.

  As in the embodiment of the present invention, the mold 10 has an abutting portion 12C, and is configured to receive a part of the optical surface LS composed of the spherical surface of the base lens L. Therefore, it is not necessary to adjust the axis deviation and the axis inclination, respectively, and the axis deviation can be corrected only by correcting the axis inclination. The optical axis MA of the transfer surface MS and the optical axis RA of the base lens L can be easily adjusted. Can be matched.

  Hereinafter, the process of matching the optical axis of the transfer surface of the mold with the optical axis of the base lens L during the complex lens manufacturing process will be described in detail. FIG. 8 is a flowchart showing the processing performed in the first embodiment.

  First, the operator places a predetermined mold 10 on the mold holding unit 20 (step ST1). When the operator gives an instruction to start the operation, first, the reference setting unit 71 detects the inclination of the plane MP perpendicular to the optical axis MA of the transfer surface MS of the mold 10 from the horizontal by the inclination detection unit 30. Then, the plane MP perpendicular to the optical axis MA of the transfer surface MS of the mold 10 is detected as a reference plane (hereinafter also referred to as the reference plane MP) (step ST2).

  Next, the control device 70 drives a resin supply unit (not shown) to supply a predetermined amount of curable resin to the transfer surface of the mold (step ST3).

  Thereafter, the lens position adjustment processing unit 72 drives the first moving unit 50 and the second moving unit 60 to move the base lens L and the mold 10 relative to each other to move the base material on the mold 10. The lens L is placed (step ST4). At this time, only one of the mold 10 and the base lens L may be moved, or both may be moved. When the base lens L is placed on the mold 10, the holding of the base lens L by the holding frame 42 is once released. Here, releasing the holding means not only bringing the holding frame 42 into a non-contact state with respect to the base lens L but also bringing the holding frame 42 into contact with the base lens L in a state where no stress is applied to the base lens L. including.

  Next, the lens position adjustment processing unit 72 drives the tilt detection unit 30 to detect the tilt of the plane LP perpendicular to the optical axis of the base lens L with respect to the reference plane MP, and the holding frame according to the detected tilt. The base lens L is moved to 42 so that the plane LP perpendicular to the optical axis LA of the base lens L is parallel to the reference plane MP (step ST5).

  Details of the reference plane setting in the above process will be described. FIG. 9 is a flowchart showing specific processing steps in step ST2 for setting the reference plane, and FIG. 10 is a schematic diagram showing a state when the reference plane is detected.

  As shown in FIG. 10, the parallel plane mirror 35 is placed on the mold 10 installed in the mold holding unit 20 (step ST21). At this time, the parallel plane mirror 35 is placed on the convex portion 12 including the abutting portion 12 </ b> C of the mold 10. The mirror surface 35 a of the parallel plane mirror 35 is a plane MP perpendicular to the optical axis MA of the mold 10.

Next, the incident measurement light 101 from the inclination detecting unit 30 on the mirror surface 35a of the parallel plane mirror 35, to detect the inclination theta ₁ of the measuring light optical axis of the reflected light 102 reflected by the mirror 35 ( Step ST22). And this inclination (theta) ₁ is set as a reference value (step ST23). Detecting the inclination θ ₁ of the reflected light optical axis is equivalent to detecting the inclination θ ₁ of the mirror surface 35a of the parallel flat mirror 35 from the plane perpendicular to the measurement optical axis (see FIG. 10). Setting the inclination of the reflected light as a reference value corresponds to setting the plane MP as a reference plane.

  In this reference surface setting process, the reference surface may be set by adjusting the inclination of the mold 10 so that the inclination of the optical axis of the reflected light 102 matches the optical axis of the measurement light 101.

  Next, details of the lens parallel adjustment processing will be described. FIG. 11 is a flowchart showing specific processing steps in step ST5 of the lens parallel adjustment process, and FIGS. 12 and 13 are schematic diagrams for explaining the lens parallel adjustment process.

As shown in FIG. 12, the parallel plane mirror 35 is placed on the base lens L placed on the mold 10 (step ST51). Then, the incident measurement light 101 from the inclination detecting unit 30 on the mirror surface 35a of the parallel plane mirror 35, to detect the inclination theta ₂ of the measuring light optical axis of the optical axis of the reflected light 102 reflected by the mirror 35 ( Step ST52). The difference between this inclination θ ₂ and the previously detected inclination θ ₁ is equal to the inclination of the plane LP of the base lens L from the reference plane MP.

Then, the lens position adjustment processing unit 72 determines whether or not the plane LP and the reference plane MP are parallel. As shown in FIG. 13, when θ ₂ = θ ₁ , the plane LP and the reference plane MP are parallel. Thus, when both are parallel (step ST53: YES), the adjustment process ends. On the other hand, when both are not parallel (step ST53: NO), the lens position adjustment processing unit 72 obtains the distance and direction in which the base lens L should be moved according to the inclination between the two, and the driving unit 45 of the holding frame 42. To adjust the movement of the base lens L (step ST54). Thereafter, the processes of steps ST52 to ST54 are repeated until both are parallel.

By the above processing, the optical axis LA of the base lens L and the optical axis MA of the transfer surface MS of the mold 10 can be matched.
In this state, the curable resin spread between the transfer surface of the mold and the optical surface of the base lens is cured with the optical axes aligned.

FIG. 14 is a view for explaining molding of a resin lens.
A curable resin R is supplied to the transfer surface MS of the mold 10 on which the reference surface is set (FIG. 14A). Thereafter, when the base lens L is placed on the mold 10, the curable resin R supplied to the transfer surface MS is spread between the transfer surface MS and the optical surface LS ((b) of FIG. 14). ). Here, before the curable resin R is cured, the above-described process of matching the optical axes of the base lens L and the transfer surface of the mold 10 is performed. Thereafter, as shown in FIG. 14C, the curable resin R is semi-cured by irradiating the curable resin R with ultraviolet rays UV transmitted through the base lens L from a light source (not shown). Furthermore, as shown in FIG. 14D, the curable resin R in a semi-cured state is heated by a heating means (not shown) in a state where the pressure is applied between the transfer surface MS and the first optical surface LS. And harden completely. Thereafter, by releasing the mold, a composite lens CL in which the resin lens RL is laminated on the optical surface LS of the base lens L as shown in FIG.

  In addition, before mounting the base lens L on the mold 10, it is preferable to apply a coupling agent to the optical surface LS of the base lens L.

  Thus, in this embodiment, if the base lens L is parallel to the mold 10, the optical axis of the base lens L and the optical axis of the transfer surface of the mold 10 can be matched, and Axis collapse can be resolved at the same time. Since a mold having an abutting portion formed around the transfer surface and projecting from the transfer surface is used, the spherical surface of the base lens is abutted against the abutting portion, and the base lens and If the molds are made parallel to each other, the optical axis of the base lens and the optical axis of the transfer surface of the mold can be matched. Therefore, the optical axis of the base lens and the optical axis of the transfer surface of the mold can be easily matched. At the same time, since the distance between the optical surface of the substrate and the transfer surface of the mold is defined, the thickness of the resin lens can be molded with high accuracy. As a result, it is possible to reduce the thickness of the resin lens, the cost and time for adjusting the axial deviation in the manufacture of the composite lens, and as a result, the manufacturing cost of the composite lens can be reduced.

  Note that the base lens holding section 40 only needs to hold the base lens L with the optical surface LS of the base lens L facing the transfer surface of the mold and the optical surface LS exposed. In the present embodiment, the edge of the base lens L is pressed and clamped from the outer peripheral side, but the base lens L may be adsorbed and held. In the case where the base lens holding unit 40 is to adsorb and hold the base lens L, a base lens moving unit for adjusting the position of the base lens may be provided separately from the base lens holding unit 40. .

  In the above embodiment, the parallel plate mirror is used to detect the inclination of the mold or the base lens. However, the parallel plate mirror is not used, and a part of the mold and a part of the base lens are used. A provided mirror surface may be used.

FIG. 15 is a schematic diagram at the time of tilt measurement for the mold 110 of the design change example.
In the mold 110, the convex portion 12 has a flat surface portion 12S that intersects the optical axis MA of the transfer surface MS perpendicularly, and the mirror surface 16 is provided on the flat surface portion 12S of the mold 110. If the mold 110 provided with the mirror surface 16 is used, the tilt of the mold 110 can be detected using the mirror surface 16 without using a parallel plate mirror.

FIG. 16 is a schematic diagram at the time of tilt measurement for the base lens L2 of the design change example.
The base lens L2 has a plane portion LS2 perpendicular to the optical axis of the base lens L2 on the surface opposite to the optical surface MS on which the resin lens is laminated. The plane portion LS2 of the base lens L2 Has a mirror surface 18. If the base lens L2 provided with the mirror surface 18 is used, the tilt of the base lens L2 can be detected using the mirror surface 18 without using a parallel plate mirror.

  Hereinafter, the result of having verified about the film thickness dispersion | variation about the compound lens produced using the manufacturing apparatus of embodiment of this invention is demonstrated.

  A compound lens was manufactured using the mold shown in FIG. 3 by the manufacturing apparatus and method described in the above embodiment. The design value of the center thickness of the resin lens in the composite lens was 290 μm. A spherical glass lens having a curvature of 113.22 mm was used as the base lens.

  For comparison, a compound lens was manufactured using a manufacturing apparatus that controls the film thickness by sliding the mold with respect to the conventional body mold. The design values of the base lens and the resin lens were the same as described above.

  FIG. 17 is a graph showing the number of compound lenses manufactured by the manufacturing apparatus of the present embodiment, and the vertical axis showing the difference from the design value of 290 μm. FIG. 18 is a graph showing the number n of compound lenses produced by a conventional manufacturing apparatus and the center thickness of the resin lens on the vertical axis. In addition, as a conventional manufacturing apparatus, since an apparatus that has already been adjusted with respect to the design value of 290 μm is used, there is variation across the design value. On the other hand, in the manufacturing apparatus of the present embodiment, since the final adjustment with respect to the design value is not performed, the center of variation is deviated from the design value. In actual manufacturing, the mold and the like are adjusted so that the design value is near the center of the variation, so that the thickness forming accuracy can be evaluated by the size of the variation.

  As shown in FIG. 18, the composite lens produced by the conventional manufacturing apparatus had a thickness variation of about 6 μm. On the other hand, as shown in FIG. 17, the composite lens produced by the manufacturing apparatus of this embodiment has a thickness variation of 2 μm or less, and it is clear that the molding accuracy of the thickness has been greatly improved.

DESCRIPTION OF SYMBOLS 1 Manufacturing apparatus 10,110 Mold 12,12A Convex part 12C Abutting part (corner part of convex part)
12S Plane portion 14 Body portion 16 Mirror surface 18 Mirror surface 20 Mold holding portion 30 Tilt detection portion 35 Parallel plate mirror 35a Mirror surface 38 Mirror placement mechanism 40 Base lens holding portion 41 Base plate 41a Opening 42 Holding frame 45 Drive portion 50 First moving unit 60 Second moving unit 70 Controller 71 Reference setting unit 72 Lens position adjustment processing unit 101 Measuring light 102 Reflected light CL Compound lens L, L2 Base lens LA Optical axis of base lens LS Base lens Optical surface of LS2 Planar part of base lens MA Optical axis of mold transfer surface MS Mold transfer surface R Curing resin RA Optical axis of resin lens RL Resin lens

Claims (13)

An apparatus for producing a compound lens, comprising: a base lens whose optical surface is a spherical surface; and a resin lens laminated on the optical surface of the base lens,
A transfer surface having an inverted shape of the optical surface of the resin lens, and a convex portion provided around the transfer surface, and a part of the optical surface of the base lens is abutted against the transfer surface. And a mold for producing a compound lens comprising an abutting portion that defines the thickness of the resin lens between the optical surface of the base lens and
A mold holding unit for holding the mold;
A first detection unit that detects, as a reference plane, a plane perpendicular to the optical axis of the transfer surface of the mold installed in the mold holding unit;
A base lens mounting mechanism for mounting the base lens on the abutting portion of the mold; and
An adjustment unit that adjusts the position of the base lens so that a plane perpendicular to the optical axis of the base lens is parallel to the reference plane detected by the first detection unit; Manufacturing equipment.   The adjustment unit detects a tilt of a plane perpendicular to the optical axis of the base lens with respect to the reference plane, and the base lens according to the tilt detected by the second detection unit The manufacturing apparatus of the compound lens of Claim 1 provided with the moving part which moves this.   The second detection unit detects the inclination of the surface perpendicular to the optical axis of the base lens with respect to the reference surface by causing light to enter and reflect the parallel plane mirror placed on the base lens. The compound lens manufacturing apparatus according to claim 2.   4. The compound lens manufacturing apparatus according to claim 1, wherein the mold has a flat portion perpendicular to the optical axis of the transfer surface. 5.   The first detection unit detects a plane perpendicular to the optical axis of the transfer surface of the mold by causing light to enter and reflect on a parallel plane mirror placed on the abutting unit of the mold. The composite lens manufacturing apparatus according to any one of claims 1 to 4. The mold has a mirror surface on the plane portion;
The compound lens manufacturing apparatus according to claim 4, wherein the first detection unit detects a plane perpendicular to the optical axis of the transfer surface of the mold by causing light to enter and reflect the mirror surface.   The composite lens manufacturing apparatus according to claim 1, wherein a transfer surface of the mold is an aspherical surface. A method of manufacturing a compound lens having a base lens whose optical surface is a spherical surface, and a resin lens provided on the optical surface of the base lens,
A transfer surface having an inverted shape of the optical surface of the resin lens, and a convex portion provided around the transfer surface, and a part of the optical surface of the base lens is abutted against the transfer surface. And a mold for producing a compound lens having an abutting portion that defines the thickness of the resin lens between the base lens and the optical surface of the base lens,
Detecting a plane perpendicular to the optical axis of the transfer surface of the mold as a reference plane;
Supplying resin to the transfer surface of the mold,
Placing the base lens on the abutting portion of the mold,
A method of manufacturing a composite lens, wherein a resin lens is molded by adjusting a position of the base lens so that a plane perpendicular to the optical axis of the base lens is parallel to the reference plane.   9. The composite lens according to claim 8, wherein a base lens having a plane portion perpendicular to the optical axis of the base lens is used on the surface opposite to the surface on which the resin lens is laminated as the base lens. Method. A manufacturing program for causing a computer to execute a manufacturing method of a compound lens having a base lens whose optical surface is a spherical surface, and a resin lens laminated on the optical surface of the base lens,
A transfer surface having an inverted shape of the optical surface of the resin lens, and a convex portion provided around the transfer surface, and a part of the optical surface of the base lens is abutted against the transfer surface. And a plane perpendicular to the optical axis of the transfer surface of a mold for producing a compound lens having an abutting portion that defines a thickness of the resin lens between the optical surface of the base lens and the optical surface of the base lens as a reference surface Steps to detect,
Supplying resin to the transfer surface of the mold;
A procedure for placing the base lens on the abutting portion of the mold; and
A composite lens manufacturing program for causing a computer to execute a procedure of adjusting a position of the base lens so that a plane perpendicular to the optical axis of the base lens is parallel to the reference plane. A mold for producing a compound lens having a base lens whose optical surface is a spherical surface, and a resin lens laminated on the optical surface of the base lens,
A transfer surface having an inverted shape of the optical surface of the resin lens, and a convex portion provided around the transfer surface, and a part of the optical surface of the base lens is abutted against the transfer surface. And a mold for manufacturing a composite lens, which includes an abutting portion that defines the thickness of the resin lens between the base lens and the optical surface of the base lens.   The mold for producing a compound lens according to claim 11, wherein the mold has a plane parallel to a plane perpendicular to the optical axis of the transfer surface.   The mold for producing a compound lens according to claim 12, wherein the flat surface has a mirror surface.