JP2001147306A - Jointed optical parts and jointing method for the optical parts - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain reliable jointing between optical materials, independently of the changes in the thermal environment while preventing bubbles from entering into the gap between the optical materials, even when the optical materials to be jointed are mutually different materials. SOLUTION: A jointing layer 4 present between optical materials 3, 5 and used for jointing the materials 3, 5 to each other is composed of an agglutinant layer and adhesive filled into the gap between agglutinant layer and at least one of the optical materials.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joined optical component and a method for joining optical components.

[0002]

2. Description of the Related Art Conventionally, optical materials which are different kinds of materials are sometimes joined to each other to form an integrated optical component. In such a joined optical component, since different materials to be joined have different thermal expansion coefficients, heat capacities, water absorption expansion coefficients, and water absorption rates, they are used in a high temperature environment, a low temperature environment, a thermal shock, a high humidity environment, and a low humidity environment. In an environment, etc., the adhesive strength decreases,
There is a problem that the material is destroyed. this is,
Since the amount of expansion or contraction due to the thermal environment change differs between the materials to be joined, a gap (difference) occurs in the amount of expansion or contraction of both materials due to the thermal environment change, and such a gap is not absorbed in the bonding layer. It is.

[0003] Therefore, joining of different materials having different thermal expansion coefficients, heat capacities, water expansion coefficients, and water absorption rates, for example, a glass plate and a polarizing plate of a liquid crystal panel is performed using an adhesive having a certain elasticity. Have been done.

[0004]

In the case where optical materials of different materials are joined to each other by using an adhesive,
Mixing of air bubbles between the adhesive and the material to be joined becomes a problem. If the optical material to be joined has a certain degree of flexibility, the optical material and the adhesive are bonded while being pressed from outside using a roller or the like, so that the optical material and the adhesive are adhered to each other. It is possible to join while expelling bubbles between the agent and the outside.

However, when the optical materials to be joined to each other are both highly rigid materials, it is very difficult to prevent air bubbles from being mixed between the optical material and the adhesive.

[0006] Such bubbles between the optical material and the pressure-sensitive adhesive scatter the light beam passing through the joint surface between the optical materials, and thus degrade the optical characteristics of the joined optical component.

Accordingly, the present invention has been proposed in view of the above-mentioned circumstances, and in a bonded optical component formed by bonding optical materials, when the optical materials to be bonded are different materials from each other. It is another object of the present invention to provide a bonded optical component in which bubbles are prevented from being mixed between the optical materials, and a method for bonding optical components capable of manufacturing such a bonded optical component.

[0008]

In order to solve the above-mentioned problems, a bonded optical component according to the present invention comprises a plurality of optical materials,
A bonding layer between the optical materials and bonding the optical materials together, the bonding layer comprising an adhesive layer, and an adhesive filled in a gap between the adhesive layer and at least one optical material. And characterized by the following.

In the method for bonding optical parts according to the present invention, when bonding a plurality of optical materials to each other, an adhesive layer is laid on a bonding surface of one optical material, and an adhesive is applied on the adhesive layer. The optical materials are bonded to each other by dropping and pressing the bonding surface of another optical material onto the adhesive layer onto which the adhesive has been dropped.

Further, in the method of bonding optical parts according to the present invention, when bonding a plurality of optical materials to each other, an adhesive is dropped on a bonding surface of one optical material, and one optical material to which the adhesive has been dropped is dropped. Lay the adhesive layer on the joint surface of the material,
The optical material is bonded to each other by dropping an adhesive onto the pressure-sensitive adhesive layer and pressing a bonding surface of another optical material onto the pressure-sensitive adhesive layer onto which the adhesive has been dropped. It is.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

[0012] The bonded optical component according to the present invention is formed as an integrated optical component by bonding a plurality of optical materials to each other. This is a method for producing a bonded optical component.

[First Embodiment] In this embodiment,
As shown in FIG. 1, a bonded optical component according to the present invention is formed by bonding a plastic microlens array 3 as an optical material and a liquid crystal display panel 5 formed of a parallel plate made of glass. And a liquid crystal display panel with a micro lens array. The microlens array 3 and the liquid crystal display panel 5 are used together with the adhesive and the adhesive, and the gap between the adhesive and the optical material is filled with the adhesive by the method of joining optical parts according to the present invention. As a result, bonding is performed in a state in which no air bubbles exist on the bonding surface.

Since both sides of the liquid crystal display panel 5 are formed of glass substrates, bonding with the microlens array 3 is bonding between different materials. Moreover,
Since both the liquid crystal display panel 5 and the microlens array 3 have high rigidity, it is difficult to join them only with an adhesive without mixing air bubbles between them.

In the present invention, as shown in FIG. 2, the liquid crystal display panel 5 and the microlens array 3 are joined together using an adhesive 6 and a liquid adhesive 7. As the liquid adhesive, a visible light-curable adhesive, an ultraviolet-curable adhesive, or an epoxy-based adhesive can be used. As the pressure-sensitive adhesive, for example, an acrylic (acrylic elastomer) pressure-sensitive adhesive (polymethylmethacrylate (Polymethylmethacry) having a structure represented by the following Chemical Formula 1] is used.
late) etc. can be used.

[0016]

Embedded image

In this joining step, first, as shown in FIG. 2A, an adhesive 6 is applied to the flat joining surface of the microlens array 3 made of plastic. Next, as shown in FIG. 2B, a liquid adhesive 7 having a relatively low viscosity of, for example, about 3,000 psi or less is dropped on the adhesive layer formed by applying the adhesive 6. Then, as shown in FIG. 2 (c), the liquid crystal display panel 5 is placed on the adhesive layer on which the liquid adhesive 7 has been dropped,
As shown in FIG. 2 (d), it is pressed toward the microlens array 3. Then, the liquid adhesive 7 spreads over the entire pressure-sensitive adhesive layer while excluding bubbles between the pressure-sensitive adhesive layer and the liquid crystal display panel 5 to the outside. The liquid adhesive 7 and the pressure-sensitive adhesive layer form the bonding layer 4. After this, FIG.
As shown in the middle (e), the bonding is completed by irradiating visible light from a metal halide lamp or ultraviolet light from an ultraviolet lamp and curing the liquid adhesive.

As shown in FIG. 1, this "liquid crystal display panel with a microlens array made of plastic" expands this light beam when a parallel light beam is incident from the microlens array 3 side to expand the liquid crystal display panel 5.
The viewing angle as a liquid crystal display is expanded by making the light incident on the liquid crystal display.

That is, the light beam emitted from the light source 1 is converted into a substantially parallel light beam by the collimator lens 2 and enters the microlens array 3. The parallel luminous flux incident on the microlens array becomes a divergent luminous flux having a divergence angle determined by the numerical aperture of the lens constituting the microlens array 3, passes through the bonding layer 4 and enters the liquid crystal display panel 5. [Second Embodiment] In this embodiment, as shown in FIG. 3, a bonded optical component according to the present invention is mounted on a glass substrate 9, 9 in which a polarizing plate 8 as an optical material is a pair of optical materials. It is configured as being joined in a sandwiched state. The polarizing plate 8 and the glass substrates 9 and 9 are used to bond at least one of the glass substrates by using the adhesive and the adhesive together with the adhesive and the optical material by the method for bonding optical parts according to the present invention. The gap is filled with the adhesive, so that the joining surfaces are joined without bubbles.

The polarizing plate 8 has a structure in which a thin polarizer is sandwiched between flat plates made of TAC (triacetylate cellulose). Therefore, what is bonded to the glass substrates 9 and 9 is a flat plate made of TAC. This polarizing plate 8 has flexibility.

Adhesives 6, 6 are provided on both sides of the polarizing plate 8.
Is applied to form an adhesive layer. This polarizing plate 8
First, as shown in FIG. 3A, the pressure-sensitive adhesive layer on one bonding surface is bonded to one glass substrate 9. At this time, the pressure-sensitive adhesive layer on the other bonding surface of the polarizing plate 8 is covered with the cover film 10. At this time,
Utilizing the fact that the polarizing plate 8 has flexibility, the polarizing plate 8 is warped in a state where one side portion of the polarizing plate 8 is in contact with the glass substrate 9 and only the one side portion is made of glass. Substrate 9
To make contact. Then, using a roller or the like,
By sequentially pressing the polarizing plate 8 from one side to the other side of the polarizing plate 8 through the cover film 10 toward the other side, bubbles between the glass substrate 9 and the adhesive layer are removed. 8 to the other side. And
As shown in FIG. 3B, the cover film 10 is peeled off to expose the pressure-sensitive adhesive layer on the other bonding surface of the polarizing plate 8.

Next, as shown in FIG. 3C, the cover film 10 is peeled off and the exposed adhesive layer on the other joining surface of the polarizing plate 8 is exposed to a pressure of, for example, about 3,000 psi or less. The liquid adhesive 7 having low specific viscosity is dropped. And
As shown in FIG. 3D, the other glass substrate 9 is placed on the adhesive layer on which the liquid adhesive 7 has been dropped, and the polarizing plate 8
And the liquid adhesive 7 is spread over the entire surface of the pressure-sensitive adhesive layer. Here, since the glass substrate 9 has high rigidity, the polarizing plate 8
The bubbles cannot be expelled by compressing the optical material while warping the optical material as in the case of bonding to the one glass substrate 9. However, the expansion of the liquid adhesive 7 eliminates bubbles. Then, the bonding is completed by curing the liquid adhesive 7 with visible light or ultraviolet light.

When the bonding surface between the other glass substrate 9 thus bonded and the pressure-sensitive adhesive layer is observed with a microscope,
As shown in FIG. 4, it was found that no air bubbles were mixed. In the case where the same optical material is used and joined without using a liquid adhesive (only with an adhesive), as shown in FIG. 5, bubbles having a diameter of about several tens μm to about 200 μm have a diameter of 100 μm to several μm. It was recognized that the particles were mixed at a distribution of 100 μm.

[Third Embodiment] In this embodiment,
As shown in FIG. 6, the bonded optical component according to the present invention is configured such that the polarizing plate 8 is bonded while being sandwiched between a glass prism 39 and a plastic prism 40, which are optical materials. Things. The polarizing plate 8 and each of the prisms 39 and 40 are configured such that at least one of the prisms is filled with the adhesive in the gap between the pressure-sensitive adhesive and the optical material by the method for bonding optical components according to the present invention. The joint is made by using both an adhesive and an adhesive in a state where there are no air bubbles on the joint surface. As a material forming the plastic prism 40, for example, a cycloolefin polymer (trade name “ZONEX” (manufactured by Nippon Zeon Co., Ltd.) or the like) can be used.

Such a joint optical component is used in an image display device using a reflection type ferroelectric liquid crystal (FLC) spatial light modulator as shown in FIG.

The polarizing plate 8 has a structure in which a thin polarizer is sandwiched between flat plates made of TAC (triacetylate cellulose) as in the above-described embodiment.

On one surface of the polarizing plate 8, an adhesive 6 is applied to form an adhesive layer. This polarizing plate 8
First, as shown in FIG. 7A, the bonding surface on which the adhesive layer is formed is bonded to the bonding surface of the glass prism 39. At this time, utilizing the fact that the polarizing plate 8 has flexibility, one side portion of the polarizing plate 8 is connected to the glass prism 3.
The polarizing plate 8 is warped in a state where the polarizing plate 8 is in contact with the glass prism 9 so that only one side of the polarizing plate 8 contacts the glass prism 39. Then, the polarizing plate 8 is pressed against the glass prism 39 sequentially from one side portion to the other side portion by using the roller 13 or the like, whereby the glass prism 39 is formed.
Air bubbles between the pressure-sensitive adhesive layer and the pressure-sensitive adhesive layer can be expelled to the other side of the polarizing plate 8. Then, as shown in FIG.
An adhesive is also applied to the other surface of the polarizing plate 8 to form an adhesive layer.

Next, as shown in FIG. 7C, the liquid adhesive 7 having a relatively low viscosity of, for example, about 3,000 psi or less is dropped on the adhesive layer on the other surface of the polarizing plate 8. . Then, as shown in FIG. 7 (d), a plastic prism 40 is placed on the adhesive layer on which the liquid adhesive 7 has been dropped, and pressed against the polarizing plate 8 to apply the liquid adhesive 7 to the adhesive. Spread all over the layer. Here, the plastic prism 4
0 is high in rigidity, so the polarizing plate 8 is
Air bubbles cannot be expelled by crimping the optical material while warping the optical material as in the case where the optical material is bonded. However, the expansion of the liquid adhesive 7 eliminates bubbles. Then, as shown in FIG.
Is cured by visible light or ultraviolet light to complete the bonding.

The gap between the polarizing plate 8 and the adhesive 6 may be filled with the liquid adhesive 7 between the polarizing plate 8 and the adhesive 6.

As shown in FIGS. 8 and 9, the ferroelectric liquid crystal spatial light modulator of the image display device using this bonded optical component includes a glass substrate 43 and a silicon substrate 44 facing each other. A liquid crystal material 45 is sandwiched between the silicon substrate 44 and the silicon substrate 44 and sealed. On the opposing surfaces of the glass substrate 43 and the silicon substrate 44, a transparent electrode 46, an aluminum electrode (reflection film) 47, and alignment films 48 and 49 for aligning the molecules of the liquid crystal material 45 are provided. . Here, the glass substrate 4
The alignment direction of the alignment film 48 provided on the third substrate 3 and the alignment direction of the alignment film 49 provided on the other silicon substrate 44 are parallel to each other. A polarizer 50 is provided on a surface of the glass substrate 43 opposite to the surface on which the transparent electrodes 46 and the alignment films 48 are provided.

As shown in FIG. 10, the liquid crystal material 45 sandwiched between the glass substrate 43 and the silicon substrate 44 does not produce a birefringence effect on incident polarized light according to the direction of the electric field due to the applied voltage. There are two states, a first state shown in FIG. 8 and a second state shown in FIG. 9 where a birefringence effect is caused. Here, assuming that the liquid crystal material 45 assumes the first state when the electric field is in the direction indicated by the arrow E in FIG. 8, the light irradiated on the reflective spatial light modulator 20 is polarized by the polarization direction of the polarizer 50. The same polarization plane component as described above is transmitted as the incident light 51 through the polarizer 50 and enters the liquid crystal material 45 sandwiched between the glass substrate 43 and the silicon substrate 44 via the transparent electrode 46 and the alignment film 48.

The incident light 51 incident on the liquid crystal material 45 is
At this time, without reaching the birefringence effect of the liquid crystal material 45, the light reaches the aluminum electrode (reflection film) 47 provided on the other silicon substrate 44, is reflected by this aluminum electrode (reflection film) 47, and is again birefringent. The light passes through the liquid crystal material 45 without being affected. Therefore, the reflected light 52 passes through the polarizer (analyzer) 28 and exits from the reflective spatial light modulator 20.

Assuming that the liquid crystal material 45 assumes the second state when the electric field is in the direction indicated by the arrow E in FIG. 9, the light applied to the spatial light modulator 20 The same polarization component as the incident light 51
0, and the liquid crystal material 4 sandwiched between the glass substrate 43 and the silicon substrate 44 via the transparent electrode 46 and the alignment film 48.
5 is incident.

The incident light 51 entering the liquid crystal material 45 is
This time, the other silicon substrate 4 is in a state where linearly polarized light is converted into circularly polarized light by the birefringence effect of the liquid crystal material 45.
4 reaches an aluminum electrode (reflection film) 47 provided on the substrate 4.
Reflected light 52 reflected by aluminum electrode (reflection film) 47
Reverses the direction of rotation of the circularly polarized light, and is again subjected to the birefringence effect by the liquid crystal material 45 sandwiched between the glass substrate 43 and the silicon substrate 44. At this time, the reflected light 52 is ideally linearly polarized light that is orthogonal to the polarization direction of the polarizer 50. Therefore, the reflected light 52 is a polarizer (photon).
The light is blocked at 28 and does not exit from the spatial light modulator 20.

Incidentally, an actual reflection type spatial light modulator is used together with an illumination optical system. This is because the amount of phase difference due to birefringence generated in the liquid crystal material 45 depends on the film thickness of the liquid crystal material 45 producing the birefringence effect and the incident angle of a light beam incident on the liquid crystal material 45. This is because a state in which birefringence due to the material 45 is not received is not regarded as black display (normally black).

The incident light 51 that has entered the polarizer 50 has the same polarization plane component as the polarization direction of the polarizer 50 transmitted through the polarizer 50 and enters the half mirror 40. Here, about half the amount of light is reflected, and the glass substrate 43 and the silicon substrate 44 are interposed via the glass substrate 43, the transparent electrode 46, and the alignment film 48.
Then, the light enters the liquid crystal material 45 sandwiched therebetween. In the case of the first state in which no birefringence effect occurs for incident polarized light,
Without being subjected to the birefringence effect of the liquid crystal material 45, the light reaches the aluminum electrode (reflection film) 47 provided on the other silicon substrate 44 and is reflected by the aluminum electrode (reflection film) 47.
The light passes through the liquid crystal material 45 without receiving the birefringence effect again. Subsequently, about half of this light beam is
And enters the analyzer 41. This analyzer 41 is
Since the polarization direction is orthogonal to the polarizer 50, the reflected light 52 is blocked by the analyzer 41.

Assuming that the liquid crystal material 45 assumes the second state, the incident light 51 incident on the polarizer 50 has the same polarization plane component as the polarization direction of the polarizer 50.
And enters the half mirror 40. Here, about half the amount of light is reflected, and the glass substrate 43 and the silicon substrate 44 are interposed via the glass substrate 43, the transparent electrode 46, and the alignment film 48.
Then, the light enters the liquid crystal material 45 sandwiched therebetween. Liquid crystal material 45
This time, the incident light 51 that has entered the birefringent effect of the liquid crystal material 45 reaches the aluminum electrode (reflection film) 47 provided on the other silicon substrate 44 this time. The reflected light 52 reflected by the aluminum electrode (reflection film) 47 is applied again to the liquid crystal material 4 sandwiched between the glass substrate 43 and the silicon substrate 44.
5 has a birefringence effect. At this time, the reflected light 52
Includes a polarization plane component parallel to the polarization direction of the analyzer 41, and the polarization plane component passes through the analyzer 41.

As shown in FIG. 6, the image display device includes a reflective ferroelectric liquid crystal spatial light modulator, and uses a light emitting diode (LED) light source, a light guide plate, and an optical film as illumination means. It has an illumination optical system, and further includes two plastic prisms, a glass prism, and two polarizing plates.

First, the video signal 11 is input to the system controller 12. Here, data necessary for driving the reflective ferroelectric liquid crystal spatial light modulator and data required for driving the light emitting diode are generated, and the reflective ferroelectric liquid crystal spatial light modulator driving circuit 13 and the light emitting diode driving circuit are respectively generated. 14 is input. The reflective ferroelectric liquid crystal spatial light modulator driving circuit 13 outputs a reflective ferroelectric liquid crystal spatial light modulator driving signal 15 and inputs the signal to the reflective ferroelectric liquid crystal spatial light modulator 16. The reflective ferroelectric liquid crystal spatial light modulator 16 has a display area having a diagonal length of about 1.14 cm.
(0.45 inches) and having the number of pixels of SVGA (800 × 600).
Is converted into the state of each pixel of the reflection type ferroelectric liquid crystal spatial light modulator 16, and the illumination light flux 28 is modulated.

On the other hand, the light-emitting diode drive current 17 output from the light-emitting diode drive circuit 14 is input to the light-emitting diode 18 to emit an illumination light beam. This illuminating light beam enters the light guide plate 19 and repeats multiple reflections inside the light guide plate 19 and partially on the rear surface 2 of the light guide plate 19.
The luminous flux emitted from 0 to the outside is reflected by the reflection plate 21 and reenters the light guide plate 19, so that the brightness and chromaticity are uniformed inside the light guide plate, and then emitted from the emission surface 22. I do. An optical film 23 is provided near the emission surface 22. The optical film 23 is mainly for controlling the divergence angle of the light beam emitted from the emission surface 22 of the light guide plate 19, and in this embodiment, the light intensity is reduced to half of the peak value. The half angle (half-value divergence angle) of the solid angle is about 20 °.

The light beam that has passed through the optical film 23 becomes linearly polarized light by the polarizer 24 and enters the glass prism 39 from the refraction surface 25. Subsequently, this light beam is reflected by the polarization beam splitter 27 forming one surface of the glass prism 39, and becomes a refraction surface 29 as an illumination light beam 28.
And enters the reflective ferroelectric liquid crystal spatial light modulator 16. In this embodiment, the angle α between the polarization beam splitter 27 and the reflective ferroelectric liquid crystal spatial light modulator 16 is 45 °.

The illumination light beam 28 incident on the reflective ferroelectric liquid crystal spatial light modulator 16 is reflected by the reflective ferroelectric liquid crystal spatial light modulator 16 so that its polarization state is modulated for each pixel as described above, and After passing through the polarizing beam splitter 27, the light enters the polarizing beam splitter 27 again. At this time, according to the polarization state of each pixel, the light beam is divided into a light beam transmitted through the polarization beam splitter 27 and a light beam reflected. The transmitted light flux is
In order to improve the contrast of the displayed image and reduce the stray light, the polarizer 24 and the analyzer 30 that is integrated with the glass prism 39 are arranged in such a direction that their polarization directions are orthogonal to each other (cross Nicols relation). The light enters the first plastic prism 40. Here, the refracting surface 29 is formed of an aspheric surface mainly for correcting distortion and curvature of field. In the present embodiment, the prism is made of glass because the reflective ferroelectric liquid crystal spatial light modulator 16 is essentially a device that modulates the polarization state of the light beam incident thereon. Until the polarization state of the reflected light beam is detected, maintaining that polarization state as much as possible,
This is useful for keeping the contrast of the displayed image high,
Therefore, it is to suppress the birefringence of the prism as small as possible. First plastic prism 40
Is partially reflected by the half mirror surface 32 in the direction of the aspherical concave reflecting surface 33 of the first plastic prism 40. When this light flux is reflected by the aspherical concave reflecting surface 33, it is given refracting power for virtual image formation (including image formation at infinity). Then, a part of this light flux passes through the half mirror surface 32 again, and is incident on the second plastic prism 34 from the refraction surface 36. This light flux exits from the refraction surface 36 of the second plastic prism 34 and enters the pupil 37 of the observer. Here, the first plastic prism 40 and the second plastic prism 34 are integrally formed on the half mirror surface 32 and the refraction surface 25 by bonding. Further, the glass prism 39 and the first plastic prism 40 are joined with the analyzer 30 interposed therebetween. The refracting surface 36 of the second plastic prism 34 is formed as an aspheric surface for correcting aberration.

In this embodiment, the surface normal vector at the intersection of the half mirror surface 32 of the first plastic prism 40 with the principal ray passing through the center of the reflective spatial light modulator and the first plastic prism 40 The angle β formed by the surface normal vector at the intersection of the aspheric concave reflecting surface 33 with the principal ray passing through the center of the reflective spatial light modulator is about 1
It is 45 °.

The light beam emitted from the light guide plate 19 and transmitted through the polarization beam splitter 27 is reflected by the aspherical concave reflecting surface 33 of the first plastic prism 40.
The light is emitted from the second plastic prism 34 as the stray light 38, but does not reach a predetermined observation region, enters the pupil 37 of the observer, and is not observed as a ghost image.

In this optical system, the plastic prisms 40 and 34, the glass prism 39, the analyzer 30, and the plastic prism 40 are
It must be optically bonded so that air bubbles do not enter the bonding layer. Although there is no big problem with the joining (adhesion) between the plastic prisms 40 and 34, the joining between the glass prism 39, the analyzer 30, and the plastic prism 40 is caused by the thermal expansion coefficient, the heat capacity, the hygroscopic expansion coefficient, and the hygroscopic coefficient. It is a joint between different dissimilar materials. Here, the normal bonding method causes problems such as a decrease in bonding strength and material destruction due to thermal stress and moisture absorption. However, if the above-described method for bonding optical components according to the present invention is used, there is a problem between optical materials. The difference in thermal expansion coefficient, heat capacity, water absorption expansion coefficient, and water absorption rate is absorbed by the adhesive, and bubbles are prevented from being mixed between the optical materials.

[0046]

As described above, in the bonding optical component and the method for bonding optical components according to the present invention, the bonding layer between the plurality of optical materials and bonding the optical materials includes the adhesive layer, An adhesive filled in a gap between the pressure-sensitive adhesive layer and at least one optical material.

The pre-adhesive is filled in the gap between the pressure-sensitive adhesive layer and the optical material, and is cured in such a manner that bubbles between the pressure-sensitive adhesive layer and the optical material are expelled outward. The adhesive absorbs the difference between the thermal expansion coefficient, the heat capacity, the water absorption expansion coefficient, and the water absorption coefficient between the optical materials.

That is, according to the present invention, in a bonded optical component formed by bonding optical materials to each other, even when the optical materials to be bonded are different materials, air bubbles are mixed between the optical materials. An object of the present invention is to provide a bonded optical component that is prevented, and to provide a method of bonding optical components that can produce such a bonded optical component.

[Brief description of the drawings]

FIG. 1 is a side view showing a configuration of a bonded optical component according to the present invention.

FIG. 2 is a process chart showing steps of a method for joining optical components according to the present invention for producing the joined optical component shown in FIG. 1;

FIG. 3 is a process chart showing another embodiment of the process of the method for joining optical components according to the present invention.

FIG. 4 is a plan view illustrating a state of a bonding surface of the optically bonded component manufactured by the method of bonding optical components illustrated in FIG. 3;

FIG. 5 is a plan view showing a state of a bonding surface of an optical junction device manufactured by a conventional optical component bonding method.

FIG. 6 is a side view showing a configuration of an image display device using the bonded optical component according to the present invention.

FIG. 7 is a process chart showing steps of a method for joining optical components according to the present invention for producing the joined optical component shown in FIG. 6;

FIG. 8 is a longitudinal sectional view showing a configuration in a first state of a reflective ferroelectric liquid crystal spatial light modulator used in the image display device.

FIG. 9 is a longitudinal sectional view showing a configuration of a reflective ferroelectric liquid crystal spatial light modulator used in the image display device in a second state.

FIG. 10 is a side view showing a configuration of a liquid crystal material of the reflective ferroelectric liquid crystal spatial light modulator.

[Explanation of symbols]

3 Micro lens array, 4 bonding layer, 5 liquid crystal display panel, 6 adhesive, 7 liquid adhesive, 8 polarizing plate, 9 glass substrate, 39 glass prism, 40
Plastic prism

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) // G02F 1/1335 G02F 1/1335

Claims (18)

[Claims] 1. An optical system comprising: a plurality of optical materials; and a bonding layer between the optical materials and bonding the optical materials to each other. The bonding layer includes a pressure-sensitive adhesive layer, and at least one optical layer including the pressure-sensitive adhesive layer. A bonding optical component comprising an adhesive filled in a gap between the material and the material. 2. The joined optical component according to claim 1, wherein the optical materials joined to each other are different materials from each other. 3. The bonded optical component according to claim 1, wherein the pressure-sensitive adhesive forming the pressure-sensitive adhesive layer is an acrylic pressure-sensitive adhesive. 4. The bonded optical component according to claim 1, wherein the adhesive is an ultraviolet-curable adhesive. 5. The bonded optical component according to claim 1, wherein the adhesive is a visible light curable adhesive. 6. The joined optical component according to claim 1, wherein the adhesive is an epoxy-based adhesive. 7. When bonding a plurality of optical materials to each other, an adhesive layer is laid on a bonding surface of one optical material, an adhesive is dropped on the adhesive layer, and the adhesive is dropped. A method for joining optical components, wherein the optical materials are joined to each other by pressing a joint surface of another optical material onto the agent layer. 8. The method according to claim 7, wherein the optical materials to be joined to each other are different materials from each other. 9. The method for bonding optical parts according to claim 7, wherein an acrylic adhesive is used as the adhesive forming the adhesive layer. 10. The method according to claim 7, wherein an ultraviolet curing adhesive is used as the adhesive. 11. The method according to claim 7, wherein a visible light curable adhesive is used as the adhesive. 12. The method according to claim 7, wherein an epoxy-based adhesive is used as the adhesive. 13. When bonding a plurality of optical materials to each other, an adhesive is dropped on a bonding surface of one optical material, and an adhesive layer is laid on a bonding surface of the one optical material to which the adhesive has been dropped. Then, an adhesive is dropped on the pressure-sensitive adhesive layer, and the respective optical materials are bonded to each other by pressing a bonding surface of another optical material onto the pressure-sensitive adhesive layer onto which the adhesive has been dropped. Method for joining optical components. 14. The method according to claim 13, wherein the optical materials to be bonded to each other are materials different from each other. 15. The method for bonding optical parts according to claim 13, wherein an acrylic adhesive is used as the adhesive forming the adhesive layer. 16. The method according to claim 13, wherein an ultraviolet-curable adhesive is used as the adhesive. 17. The method according to claim 13, wherein a visible light curable adhesive is used as the adhesive. 18. The method according to claim 13, wherein an epoxy adhesive is used as the adhesive.