JP2002365510A - Lens assembly for optical recording, housing frame thereof and method for manufacturing lens assembly for optical recording - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens assembly for optical recording, where increase in transmitted wave front aberrations is restrained, also an uncured adhesive does not remain, and a lens and a space ring are accurately fixed, and to provide its housing frame and a method for manufacturing the lens assembly for optical recording. SOLUTION: For this lens assembly for optical recording, where the lens 4 and the space ring 5 are fixed in a transparent lens frame 1 provided with a plurality of through-holes 3 at a cylinder part, a photosetting type adhesive substantially is completely cured by making it irradiated with light from outside of the transparent lens frame.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical recording lens assembly used for a system for recording information on an optical information recording medium and reproducing the recorded information, and a frame for storing the same.
Also, the present invention relates to a method for manufacturing such a lens assembly by fixing a lens and an interval ring to a lens frame with a photocurable adhesive with high precision.

[0002]

2. Description of the Related Art An optical recording lens assembly used in a system for producing a master of an optical information recording medium such as an optical disk, a magneto-optical disk, a DVD, etc. comprises a cylindrical lens having a plurality of concave and / or convex lenses. Has a structure fixed to the frame. An example of such a lens assembly is described in, for example,
Nos. 19162, 6-3586, 6-11648, and 6-11649. Such a lens assembly for optical recording needs to be able to record a large amount of data by reducing the diameter of the condensed spot, so that the transmitted wavefront aberration of these lenses is also highly accurate at 0.05λrms or less. It is required that

However, such an optical recording lens assembly that corrects aberrations by combining a plurality of lenses involves a processing error in the manufacture of each lens, so that alignment of the lenses is indispensable. It is also required to accurately maintain the position of the lens after the core. Therefore, in order to produce a high-precision optical recording lens assembly, a method of fixing a lens that greatly affects the accuracy has been studied.

As a method of fixing a lens of an optical recording lens assembly, a method of bonding a lens using a photo-curable adhesive such as a UV-curable adhesive has conventionally been known.
One example of such a method will be described with reference to FIG. 8 which is an axial sectional view of an optical recording lens assembly. First, a predetermined lens 4 and a spacing ring 5 are mounted inside a cylindrical lens frame 11 having a flange portion 11a at one end, and the holding ring 2 is screwed to the other end of the lens frame 11. A UV curable adhesive is injected from the plurality of through holes 3 provided in the cylindrical portion of the lens frame 11, and ultraviolet light (λ = 365 nm) is transmitted from the optical fiber 52 from outside the lens frame 11.
Is applied to the UV curable adhesive 50 in each through hole 3 to be cured. The lenses 4 and the spacing rings 5 are fixed to the inner surface of the lens frame 11 by curing the UV-curable adhesive 50.

[0005]

However, it has been found that the above method has the following problems. That is, of the injected UV-curable adhesive 50, the light-irradiated portion 50 a cures, but enters the lens adjustment gap 6, which is the gap between the lens frame 11 and each lens 4 and the spacing ring 5. Since no light is applied to 50b, the uncured UV-curable adhesive 50 remains. The uncured adhesive in the entry portion 50b gradually spreads and enters the lens surface from between the lens 4 and the spacing ring 5, or gradually evaporates and adheres to the lens surface, and the transmittance of the lens 4 decreases. This may lead to a reduction or an increase in transmitted wavefront aberration.

Further, the UV-curable adhesive cures from the vicinity of the surface irradiated with ultraviolet rays, and the cured portion has a property of absorbing ultraviolet rays. Fig. 9 shows a UV-curable adhesive (trade name Loctite) cured on a reference slide glass.
352, Loctite Co., Ltd., thickness t = 1.2mm after curing)
1 shows an example of a light transmittance curve of the present invention. From FIG. 9, it can be seen that light near λ = 365 nm required for curing is almost absorbed and shows only a slight transmittance. In addition, since the transmittance of ultraviolet rays decreases exponentially with an increase in the thickness of the cured portion, the ultraviolet irradiation time must be lengthened in order to cure the uncured portion remote from the irradiation surface.

[0007] Such long-time irradiation causes an increase in the temperature of the lens frame and the lens, and as a result, distortion occurs due to the difference in the coefficient of thermal expansion of each member, and the positional alignment of the lens decreases and the transmitted wavefront aberration increases. There is a problem that the adverse effect appears.

Accordingly, an object of the present invention is to suppress an increase in transmitted wavefront aberration and to prevent the uncured adhesive from remaining,
By providing an optical recording lens assembly having a lens and a spacing ring fixed with high precision and a storage frame thereof, and a method of manufacturing an optical recording lens assembly by fixing a lens and a spacing ring with high precision. is there.

[0009]

Means for Solving the Problems As a result of intensive studies in view of the above-mentioned object, the present inventors have found that a transparent lens frame is used and a transparent lens frame is attached to a light-curing adhesive injected between the lens and the spacing ring and the lens frame. By irradiating light from the outside through the lens frame, the photocurable adhesive is substantially completely cured, so that the lens and the spacer ring can be fixed without substantially leaving the uncured adhesive, In addition, the present inventors have found that the optical recording lens assembly obtained by such a method not only has a good lens position uniformity but also suppresses an increase in transmitted wavefront aberration, and has reached the present invention.

That is, in the optical recording lens assembly of the present invention, the lens and the spacing ring are housed in a transparent lens frame having a plurality of through holes formed in the cylindrical portion, and the photocurable adhesive injected from the through holes is provided. An optical recording lens assembly in which the lens and the spacing ring are fixed by an agent, wherein the photocurable adhesive is substantially completely cured by irradiating light from outside the transparent lens frame. It is characterized by the following.

It is preferable that each lens of the optical recording lens assembly is provided with a plane portion perpendicular to the optical axis direction on the outer peripheral portions on both side surfaces. Preferably, at least one of the lenses is fixed to an inner lens frame coaxially located in the lens frame, and both end surfaces of the inner lens frame are preferably planes perpendicular to the optical axis direction.

The plurality of through-holes provided in the cylindrical portion are preferably used for injecting a light-curable adhesive and / or for aligning a lens, and the light-curable adhesive is cured by visible light or ultraviolet light. Is preferred.

It is preferable that the optical recording lens assembly of the present invention is housed in a storage frame for use. The first storage frame of the present invention is:
The optical recording lens assembly is fixed inside through a packing.

In order to fix the optical recording lens assembly to the storage frame, it is preferable that an attachment ring is provided on the outer periphery of the cylindrical portion of the transparent lens frame. Preferably, the mounting ring has at least one slit in the radial direction and is elastically deformable.

The second storage frame of the present invention is characterized in that the optical recording lens assembly is fixed inside via the mounting ring provided on the outer periphery of the cylindrical portion of the transparent lens frame.

According to the method of manufacturing an optical recording lens assembly of the present invention, an optical recording lens assembly in which a lens and a spacing ring are housed and fixed in a transparent lens frame having a plurality of through holes in a cylindrical portion is manufactured. (1) after aligning the lens, injecting a photocurable adhesive from the through hole, (2) irradiating light from the outside of the transparent lens frame, thereby the photocurable It is characterized in that the adhesive is substantially completely cured.

In the method of manufacturing a lens assembly for optical recording, it is preferable to use a photocurable adhesive which is cured by visible light or ultraviolet light as the photocurable adhesive. Further, it is preferable to use a plurality of light sources for light irradiation and to irradiate light so that each of two optical axes forms a predetermined angle with respect to the photocurable adhesive injected from the through hole. The light irradiation is preferably performed while rotating the optical recording lens assembly.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS [1] Structure of Optical Recording Lens Assembly (1) Structure of Optical Recording Lens Assembly The optical recording lens assembly of the present invention is transparent having a plurality of through holes in a cylindrical portion. The lens and the spacing ring are housed in a simple cylindrical lens frame, and are fixed by a photo-curing adhesive.

(A) First Embodiment The structure of an optical recording lens assembly according to a first embodiment will be described in detail with reference to FIG. FIG. 1 shows an optical recording lens assembly according to a first embodiment of the present invention before a photocurable adhesive is injected. The cylindrical transparent lens frame 1 has a flange portion 1a at one end, and a metal ring 8 is fixed to the other end by bonding, brazing, or the like. The metal ring 8 is preferably, for example, an aluminum ring. Inside the metal ring 8, there is a retaining ring 2
Has a threaded portion 8b for screwing. Transparent lens frame 1
Has a plurality of through holes 3 formed in its cylindrical portion.

The plurality of lenses 4 and the plurality of spacing rings 5 housed in the transparent lens frame 1 have the same outer diameter, and the outer diameter of each lens 4 and the spacing ring 5 is slightly smaller than the inner diameter of the transparent lens frame 1. Therefore, a gap 6 is formed between the outer surface of the lens 4 and the spacing ring 5 and the inner surface of the transparent lens frame 1.
The gap 6 is used as a space for centering the lens 4. The plurality of lenses 4 and the plurality of spacing rings 5 are housed in the transparent lens frame 1, and the holding ring 2 is screwed into a screw portion 8 b of a metal ring 8 fixed to the other end of the transparent lens frame 1. I have. The spacing ring 5 is preferably made of, for example, glass or aluminum, and more preferably made of glass.

As is clear from FIG. 1, the through hole 3 is used as a through hole for inserting an alignment pin when aligning the lens 4 and for injecting a photo-curing adhesive. It is also used as a through hole.

(B) Second Embodiment FIG. 2 is an axial sectional view of an optical recording lens assembly according to a second embodiment of the present invention before a photo-curable adhesive is injected. The transparent lens frame 1 includes a plurality of lenses 4 and an interval ring 5.
The pressing ring 2 is screwed into a screw portion 8b of a metal ring 8 fixed to the other end of the transparent lens frame 1. In this lens assembly for optical recording, a flat portion F perpendicular to the optical axis direction is formed on the outer peripheral portions on both surfaces of each lens 4. The end face of the spacing ring that is in contact with the plane portion F of the lens is also a plane perpendicular to the optical axis direction.

In the second embodiment, even if each lens 4 is moved in the radial direction by centering, no force is exerted in the thrust direction on another adjacent member (the lens 4 or the spacing ring 5). There is an advantage that the change of the lens interval or the inclination of the lens 4 can be prevented.

(C) Third Embodiment FIG. 3 is an axial sectional view of an optical recording lens assembly according to a third embodiment of the present invention before a photocurable adhesive is injected. The transparent lens frame 1 has lenses 4a, 4b, 4c, and 4d with the inner lens frames 25a and 25b mounted thereon, and flat portions F on both outer peripheral surfaces.
Are formed, and the spacing ring 5 is housed therein, and is temporarily fixed by the holding ring 2. As shown in FIG. 3, a plurality of lenses are mounted on one internal lens frame (for example, lenses 4a and 4b on an internal lens frame 25a),
The end surfaces E of the inner lens frames 25a and 25b and the end surface G of the spacing ring 5 are also planes perpendicular to the optical axis direction.

In the third embodiment, no force is exerted in the thrust direction by alignment, and since a plurality of lenses are mounted on one internal lens frame, the number of alignment points is reduced, and alignment is easy. There is an advantage that it becomes.

(2) Transparent lens frame The lens assembly for optical recording of the present invention uses a transparent lens frame, and irradiates light from outside the transparent lens frame to cure the light-curable adhesive, thereby obtaining the lens and Fix the spacing ring. Here, “transparent” means substantially transparent, and means that the transmittance is 10% or more in a part or the whole of light in the ultraviolet to visible region (λ = 200 to 800 nm), and 50%
It is preferable that this is the case. In particular, in order to efficiently cure an ultraviolet curable adhesive, the transmittance of light of λ = 350 to 450 nm is 7
It is preferably 0% or more. The outer peripheral surface may be a slick surface, but it is preferable in terms of work that the photocurable adhesive can be visually confirmed.

Examples of the material forming the transparent lens frame include glass, quartz, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polystyrene, polycarbonate, polyether sulfone, polyacrylate, polymethacrylate, and the like. Of these, glass is more preferable from the viewpoint of strength and thermal expansion coefficient. Specifically, ultraviolet rays (λ = 365nm)
In particular, white plate glass, Pyrex (registered trademark), BK7, and the like are preferable from the viewpoint of the transparency of the glass.

When the optical recording lens assembly of the present invention is housed in a second housing frame described later, it is preferable to provide a mounting ring 9 on the outer periphery of the cylindrical portion of the transparent lens frame as shown in FIG. The donut-shaped plane formed by the mounting ring 9 is preferably perpendicular to the optical axis, and the position where the mounting ring 9 is provided is an outer peripheral surface substantially corresponding to the position 71 of the center of gravity of the optical recording lens assembly. preferable. Mounting ring 9
The shape of the cross section in the axial direction is preferably a gradient, and one end surface (to-be-exposed body side) forms an inclined surface and the other end surface forms a horizontal plane perpendicular to the optical axis direction.

The mounting ring 9 may be any as long as the lens frame can be fixed to a second storage frame described later. For example, a donut-shaped ring is pressed into the outer periphery of the transparent lens frame 1 and brazed.
It may be attached by adhesion or the like. When the transparent lens frame 1 is stored in the storage frame, in order to fix the lens frame at the center by the centering action, it is preferable that the mounting ring 9 is particularly elastically deformable, and at least one slit is provided in the radial direction. It is preferred to have. For this reason, the attachment ring is preferably made of metal, synthetic resin, or the like, and particularly preferably made of metal.

(3) Photo-curable adhesive The photo-curable adhesive is cured by visible light or ultraviolet light.
The photocurable adhesive used in the present invention may be any of these. In addition, it is desirable that the photo-curing adhesive does not generate gas to protect the lens 4 and that it cures quickly with low energy.

Photocurable adhesives are known per se and are generally photopolymerizable polymers or oligomers or polymerizable polymers or oligomers containing photoinitiators and / or photocrosslinkers. Examples of such a photo-curable adhesive include a photo-curable epoxy resin, a photo-curable acrylic resin, and a photo-curable silicone resin. Also, a rubber-like photocurable adhesive having elasticity can be used, and in this case, the lens position can be maintained after the alignment without giving any distortion to the lens.

[2] Manufacturing Method of Optical Recording Lens Assembly The method of the present invention will be described with reference to FIG. 1, FIG. 4, and FIG. 5 which is a sectional view taken along line AA of FIG. In this method, each lens 4 and each spacing ring 5 in the optical recording lens assembly of FIG. 1 are fixed with a photo-curable adhesive. First, as shown in FIG. 1, a plurality of lenses 4 and a plurality of spacing rings 5 are sequentially incorporated into a cylindrical transparent lens frame 1,
The retaining ring 2 is loosely screwed into the screw portion 8b of the metal ring 8 fixed to the other end of the metal ring 8 and temporarily tightened.

Next, as shown in FIG. 1, the alignment of each lens 4 is performed. For this purpose, the alignment pins 40 are inserted into the through holes 3 which are spaced apart by 90 ° in the circumferential direction, and the alignment pins 40 are inserted in the radial direction of the cylindrical transparent lens frame 1 by a micro head or a piezo element. (In the direction of the arrow in FIG. 1), and each lens 4 is aligned while observing the transmitted wavefront with an interferometer (not shown). By using a micro head, a piezo element, or the like, it is possible to perform fine adjustment of submicron. Note that the number of through holes 3 into which the alignment pins 40 are inserted is not particularly limited, and may be three when the outer diameter of the lens 4 is small.

The alignment method is not particularly limited.
Since the alignment sensitivity differs for each lens, for example, it is preferable to first align the lens with the highest sensitivity and then gradually adjust the lens with a lower sensitivity. When the alignment is performed from the coarse adjustment to the fine adjustment in this manner, the alignment can be relatively easily performed with high accuracy.

After the alignment, as shown in FIGS. 4 and 5, a photocurable adhesive 50 is injected from the through hole 3 of the cylindrical transparent lens frame 1. The injected photo-curable adhesive 50 is applied to each through hole 3
There is a portion that is not exposed to the through hole 3 because it enters the nearby gap 6. As shown in FIGS. 4 and 5, by irradiating light from the outside of the transparent lens frame through the transparent lens frame, the portion of the photocurable adhesive 50 is cured. Due to the curing of the photocurable adhesive 50, each lens 4 and each spacing ring 5 are firmly fixed to the cylindrical transparent lens frame 1, and their fine adjustments do not shift.

As shown in FIG. 5, the cylindrical transparent lens frame 1 in which the photocurable adhesive is injected into the through holes is placed on a rotary table (not shown) and rotated. Next, the light source (optical fiber
53 and a plurality of condenser lenses 54), each having two optical axes directed to the photocurable adhesive, preferably 30 to 150 °,
More preferably, the light curing adhesive 50 is irradiated by arranging a light source so as to form an angle of 30 to 90 °. According to this method, the entire surface of the photo-curable adhesive injected from the through hole can be uniformly irradiated at one time, so that the photo-curable adhesive is substantially completely cured without leaving uncured portions. In addition, since the irradiation is performed while rotating the cylindrical transparent lens frame 1, it is possible to prevent a certain range from being continuously irradiated for a long time, thereby preventing an unnecessary temperature rise.

The light source is not particularly limited as long as it emits visible light or ultraviolet light, such as a mercury lamp, a xenon lamp, and a halogen lamp, and can be used in the present invention.

[3] Storage Frame for Optical Recording Lens Assembly (1) First Storage Frame FIG. 6 is an axial sectional view of the first storage frame. The cylindrical storage frame 61 has a flange portion 61a at one end and a holding ring 6 at the other end.
2 has a screw portion 61b for screwing the two. A storage frame mounting flange 70 is provided on the outer periphery of the cylindrical portion of the storage frame 61, and the storage frame mounting flange 70 has at least three fixing screw holes 70a.
It is provided in the place. An annular groove 62a is provided inside the holding ring 62.
Are formed, and the O-ring 63 is housed in the groove. First, the bonded optical recording lens assembly is inserted into the storage frame 61, and then the pressing ring 62 containing the O-ring 63 is inserted into the storage frame 61.
Screwed to the other end of

The first storage frame accommodates the optical recording lens assembly elastically fixed therein through the packing. As the packing, a squeeze packing such as an O-ring or a square ring is preferable.

The first storage frame is fixed to a voice coil (not shown) via a storage frame mounting flange 70,
It is used by moving up and down (autofocus) to the focal position 72 in accordance with the irregularities of.

Since the first storage frame of the present invention fixes the optical recording lens assembly via the packing, the optical recording lens assembly is not deformed by the force in the thrust direction. When directly fixed with the presser ring without using the packing, it is deformed by the force in the thrust direction and affects each lens inside. For this reason, the transmitted wavefront aberration increases, the condensing diameter increases, and a predetermined resolution cannot be obtained.

Further, the first storage frame of the present invention absorbs expansion and contraction due to a difference in linear expansion coefficient between the storage frame and the lens frame by elastically fixing the optical recording lens assembly via packing. be able to. Also, the packing acts as a spring against vibration when the optical recording lens is moved in the optical axis direction in accordance with the unevenness of the object 73 to be focused, thereby preventing displacement.

(2) Second Storage Frame FIG. 7 is an axial sectional view of the second storage frame. The second storage frame includes a small-diameter portion 81a, a large-diameter portion 81b, and an inclined portion 81 connecting the two.
c. The inner diameter of the small inner diameter portion (to be exposed) 81a is slightly larger than the outer diameter of the cylindrical portion of the lens frame, and smaller than the outer diameter of the lens frame including the mounting ring 9. Large inner diameter part
The inner diameter of 81b is slightly larger than the outer diameter of the lens frame including the mounting ring 9. The small inner diameter portion 81a has a length from the end of the object to be exposed to the mounting ring of the lens frame, and has an inclined portion 81c.
Then, the process proceeds to the large inner diameter portion 81b. Slope 81e of slope 81c
Has a gradient at the same angle as the inclined surface 9a of the mounting ring 9 of the lens frame.

The second housing frame houses an optical recording lens assembly provided with a mounting ring on the outer periphery of the cylindrical portion. First, the bonded optical recording lens assembly is inserted into the second storage frame, and then the gap 8 between the transparent lens frame 1 and the large inner diameter portion 81b of the storage frame is inserted.
Insert the holding ring 82 into 3, and screw the other end. At this time, the inclined surface 9a of the mounting ring 9 of the lens frame coincides with the inclined surface 81e of the storage frame, and when the optical recording lens assembly is fixed to the storage frame, the radial direction of the lens of the lens frame is adjusted to the axis of the storage frame. It is almost perpendicular to the direction.

The second storage frame is fixed to a voice coil (not shown) via the storage frame mounting flange 70, and the exposed object 73 is exposed.
It is used by moving up and down (autofocus) to the focal position 72 in accordance with the irregularities of.

As described above, by providing a slope on one surface of the mounting ring of the lens frame (to be exposed), alignment of the inclined surface when the horizontal surface perpendicular to the optical axis direction on the opposite side is tightened by the presser ring. By the action, it is possible to automatically attach the optical axis to the center of the storage frame. Also, since the lens assembly for optical recording is fixed to the housing frame via the mounting ring and presses only the mounting ring, no thrust force is applied to the lens frame, and the lens frame is expanded and contracted except for the mounting ring. No effect. Therefore, the resolution does not decrease due to an increase in the transmitted wavefront aberration, and the resonance does not affect the reciprocation at the time of focusing at a high speed.

The material for forming the storage frame is not particularly limited, but a magnesium alloy, an aluminum alloy or the like is preferable from the viewpoint of strength and weight.

[0048]

As described above, since the optical recording lens assembly of the present invention uses a transparent lens frame, light can be applied to the photocurable adhesive from outside through the transparent lens frame.
Has excellent curing action. Therefore, it is possible to suppress a decrease in lens position adjustment accuracy and an increase in transmitted wavefront aberration.

[Brief description of the drawings]

FIG. 1 is an axial sectional view of an optical recording lens assembly according to a first embodiment of the present invention, wherein each lens and each interval ring are accommodated in a cylindrical transparent lens frame of the optical recording lens assembly;
It is sectional drawing which shows the state temporarily fixed by the holding ring.

FIG. 2 is an axial sectional view of an optical recording lens assembly according to a second embodiment of the present invention, and is a sectional view showing a state in which lens alignment is performed.

FIG. 3 is an axial cross-sectional view of an optical recording lens assembly according to a third embodiment of the present invention, showing a state where alignment of a lens or the like is performed.

FIG. 4 is an axial sectional view showing a state in which light irradiation is performed after a photocurable adhesive is injected from a through hole of the optical recording lens assembly of the present invention.

FIG. 5A illustrates a state where light irradiation is performed after a photocurable adhesive is injected into the optical recording lens assembly of the present invention.
It is -A sectional drawing.

FIG. 6 is an axial sectional view showing a state where the optical recording lens assembly is housed in the first housing frame of the present invention.

FIG. 7 is an axial sectional view showing a state where the optical recording lens assembly is housed in a second housing frame of the present invention.

FIG. 8 is an axial sectional view showing a state in which light irradiation is performed after a photocurable adhesive is injected from a through hole of a conventional optical recording lens assembly.

FIG. 9 is a graph showing a light transmittance curve of a photocurable adhesive after curing.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Cylindrical transparent lens frame 1a ... Flange part 2 ... Holding ring 3 ... Through-hole 4, 4a, 4b, 4c, 4d, 4e ... Lens 5 ... Spacing ring 6. ..Alignment gap 8 ・ ・ ・ Metal ring 9 ・ ・ ・ Mounting ring 11 ・ ・ ・ Cylindrical lens frame 11a ・ ・ ・ Flange 25a, 25b ・ ・ ・ Internal lens frame 40 ・ ・ ・ Alignment pin 50・ ・ ・ Photo-curable adhesive 50a ・ ・ ・ Cured adhesive 50b ・ ・ ・ Uncured adhesive 52,53 ・ ・ ・ Optical fiber 54 ・ ・ ・ Condenser lens 61 ・ ・ ・ First storage frame 61a ・ ・ ・Storage frame flange 61b, 81d ・ ・ ・ Storage frame screw 62, 82 ・ ・ ・ Storage frame press ring 62a ・ ・ ・ Circular groove 63 ・ ・ ・ O-ring 70 ・ ・ ・ Storage frame mounting flange 70a ・ ・ ・ For fixing Screw hole 71 ・ ・ ・ Center of gravity position 72 ・ ・ ・ Focal position 73 ・ ・ ・ Object to be exposed 81 ・ ・ ・ Second storage frame 81a ・ ・ ・ Small inner diameter part 81b ・ ・ ・ Large inner diameter part 81c ・ ・ ・ Inclination part 81e ・ ・ ・ Slope 83 ・ ・ ・Planar end face of the even planar portion G · · · spacer ring flat portion F · · · lens ring insertion gap E · · · rim

Claims (13)

[Claims] 1. A lens and a spacing ring are housed in a transparent lens frame having a plurality of through holes formed in a cylindrical portion, and the lens and the spacing ring are fixed by a photo-curing adhesive injected from the through hole. An optical recording lens assembly, wherein the photocurable adhesive is substantially completely cured by irradiating light from outside the transparent lens frame. Three-dimensional. 2. The optical recording lens assembly according to claim 1, wherein each of the lenses has a plane portion perpendicular to an optical axis direction on outer peripheral portions on both side surfaces. Lens assembly. 3. The optical recording lens assembly according to claim 1, wherein at least one of the lenses is fixed to an inner lens frame coaxially located in the lens frame.
An optical recording lens assembly, wherein both end surfaces of the inner lens frame are planes perpendicular to an optical axis direction. 4. The optical recording lens assembly according to claim 1, wherein each of the plurality of through holes is used for injecting the photocurable adhesive and / or for aligning the lens. An optical recording lens assembly, characterized in that: 5. An optical recording lens assembly according to claim 1, wherein said photocurable adhesive is cured by visible light or ultraviolet light. 6. An optical recording lens assembly according to claim 1, wherein a mounting ring is provided on an outer periphery of said transparent lens frame. 7. The optical recording lens assembly according to claim 6, wherein the mounting ring has at least one slit in a radial direction and is elastically deformable. Three-dimensional. 8. A storage frame for the optical recording lens assembly according to claim 1, wherein the optical recording lens assembly is fixed inside via a packing. Storage frame. 9. A storage frame for the optical recording lens assembly according to claim 6, wherein the optical recording lens assembly is mounted via a mounting ring provided on an outer periphery of the transparent lens frame. Storage frame characterized by being fixed inside. 10. A method for manufacturing an optical recording lens assembly in which a lens and a spacing ring are housed and fixed in a transparent lens frame having a plurality of through holes formed in a cylindrical portion, wherein (1) the lens is After the alignment, a photocurable adhesive is injected from the through hole, and (2) light irradiation is performed from outside the transparent lens frame, whereby the photocurable adhesive is substantially completely cured. Features method. 11. The method for manufacturing an optical recording lens assembly according to claim 10, wherein a light-curable adhesive that is cured by visible light or ultraviolet light is used as the light-curable adhesive. . 12. The method for manufacturing an optical recording lens assembly according to claim 10, wherein the light irradiation uses a plurality of light sources, and two light sources are used for each of the photocurable adhesives injected from the through holes. Irradiating light so that the optical axis of the light beam forms a predetermined angle. 13. The method of manufacturing an optical recording lens assembly according to claim 10, wherein light is irradiated while rotating the optical recording lens assembly.