JP2000321480A - Prism device and manufacture of prism device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately position and fit a cross prism to a base and to reduce the manufacturing cost. SOLUTION: As for the end surface 12a of the cross prism 12 for liquid crystal projector on the side of the base 14, an end surface 21a of a 1st right- angled prism 21 is projected from end surfaces 22a, 23a, and 24a of other right- angled prisms 21, 22, and 24. This end surface 21a is made to abut against a support surface 27 of the base 14 and on the basis of this abutting part, the cross prism 12 is supported on the base 14. The spaces between the end surfaces 22a, 23a, and 24a are filled with ultraviolet-ray setting resin pieces 32, 33, and 33. The cross prism 12 can easily and accurately be positioned and fixed at a desired position without being slanted even when the end surfaces 21a, 22a, 23a, and 24a of the right-angled prisms 21, 22, 23, and 24 are not formed accurately on the same plane.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a prism device having a prism supported on a support, and a method of manufacturing the prism device.

[0002]

2. Description of the Related Art Conventionally, for example, in a liquid crystal projector, a red color light R, a green color light G, and a blue color light B, each of which is light-modulated, are combined into a single light beam by a cross prism to form a desired image on a projection surface. Projection configurations are known.

The cross prism has a rectangular parallelepiped shape in which four right-angle prisms are bonded with their right-angled surfaces facing each other, and a dichroic surface is formed on a cross-shaped joining surface where the right-angled surfaces face each other. . Then, the respective color lights incident from the three side surfaces of the cross prism facing the dichroic surface at an angle of 45 degrees are combined into one light beam on the dichroic surface and emitted from the other one side surface.

Here, when the dichroic surface is not orthogonal to the optical axis of each color light or the combined light,
The optical axis of each color light included in the light flux of the light transmitted or reflected on the dichroic surface and synthesized does not match, so that a so-called pixel shift occurs on the projection surface, and the image quality is degraded.

[0005] On the other hand, the cross prism is attached to the housing of the liquid crystal projector by supporting an end face (bottom face) orthogonal to each side face portion with a support, and is used for bonding right-angle prisms constituting the cross prism to each other. However, it is difficult to form the cross prism by completely aligning the end faces of the right-angle prisms in view of the positioning accuracy of the cross prism, etc., and the end face of the cross prism is in a state where irregularities are generated for each right-angle prism. . Thus, if the end face of the cross prism having such irregularities is supported on a support base and attached to the housing, the dichroic surface is inclined with respect to the optical axis, which causes a pixel shift.

In this regard, a configuration in which the end face of the cross prism is polished to form a smooth end face without any level difference for each right-angle prism, and is mounted vertically on the support table is considered. However, the configuration in which the polishing process is performed has a problem that the number of steps of the polishing process increases and the manufacturing cost increases.

[0007]

As described above, it is not easy to accurately position a prism in which a plurality of prism elements are adhered to each other and mount the prism on a support, and the optical characteristics are reduced, or the manufacturing cost is reduced. Has the problem of rising.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a prism device and a method of manufacturing a prism device capable of reducing manufacturing costs and improving optical characteristics.

[0009]

According to a first aspect of the present invention, there is provided a prism apparatus comprising: a prism having a plurality of prism elements attached to each other; and a support having a support for supporting the prism. The prism element directly abuts on the support, and the other prism elements are adhered and supported on the support via a filler.

In this configuration, with respect to a prism supporting structure having a plurality of prism elements, one prism element is directly in contact with the support base to serve as a reference for positioning, and the other prism elements are filled with a filler. By adhering to the support through the support, the prism is accurately positioned and fixed to the support, and the optical characteristics are improved. Further, there is no need to increase the molding accuracy of the prism, and the manufacturing cost is reduced.

The prism device according to the second aspect is the first aspect.
In the above-described prism device, an adhesive region is provided on a part of the support portion of the support base so as to adhere to another prism element via a filler.

[0012] In this configuration, since the bonding area for bonding to the other prism element via the filler is provided on a part of the support portion of the support table, not on the entire surface, the amount of the filler can be reduced and adjusted. It becomes easy, the displacement of the prism due to the change in the volume of the filler is suppressed, and the optical characteristics are improved.

According to a third aspect of the present invention, there is provided a prism device.
In the prism device described in (2), a direct contact portion between the prism element and the support is bonded by bonding means.

In this configuration, the prism is firmly supported by the support.

According to a fourth aspect of the present invention, there is provided a prism device comprising: a prism in which a plurality of prism elements are bonded to each other; and a support base provided with a support for supporting the prism. The prism elements are in direct contact with each other, and the contact portions are bonded by bonding means, and the other prism elements are separated from the support by a space.

In this configuration, with respect to the prism supporting structure having a plurality of prism elements, one prism element is directly brought into contact with the support base to serve as a reference for positioning, and this contact part is adhered. As a result, the entire prism is supported, and the other prisms are separated from the support. Therefore, the prism is accurately positioned and fixed to the support, and the optical characteristics are improved. Further, there is no need to increase the molding accuracy of the prism, and the manufacturing cost is reduced. Further, with this configuration, a filler is not required, the configuration is simplified, and the optical characteristics can be improved without being affected by a change in the volume of the filler.

According to a fifth aspect of the present invention, there is provided a prism device.
In any one of the prism devices according to any one of (4) to (4), one prism element is provided with an abutting portion protruding from the other prism element to the support portion side.

In this configuration, a configuration in which one prism element is directly in contact with the support base and is used as a reference for positioning is easily realized.

According to the sixth aspect of the present invention, there is provided a prism apparatus.
5. The prism device according to any one of Items 4 to 4, wherein a contact portion that abuts on one prism element protrudes from the support base.

In this configuration, a configuration in which one prism element is directly brought into contact with the support base and used as a reference for positioning is easily realized.

According to a seventh aspect of the present invention, there is provided a method of manufacturing a prism device, comprising: a prism having a plurality of prism elements bonded together; and a support for supporting the prism. A prism forming step of bonding prism elements to each other to form a prism, and directly contacting and supporting one of the prism elements constituting the prism with a support, and interposing a prism element between the other prism element and the support. A prism body bonding step of filling and bonding a filler.

In this configuration, with respect to a prism having a plurality of prism elements, one prism element is directly brought into contact with the support base to serve as a reference for positioning, and the other prism elements are supported via a filler. By bonding to the base, the prism is accurately positioned and fixed to the support base,
Optical characteristics are improved. Further, there is no need to increase the molding accuracy of the prism, and the manufacturing cost is reduced.

According to a eighth aspect of the present invention, there is provided a method of manufacturing a prism device, comprising the steps of:
A direct contact portion between the prism element and the support is bonded and fixed, and then a filler is filled between the other prism element and the support to be solidified.

In this configuration, the direct contact portion between the prism element and the support base is bonded and fixed, so that the filler filled between the prism element and the support is solidified until the filler is solidified. Is not required to be maintained, the manufacturing process is simplified, and the manufacturing cost is reduced.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a prism device and a method for manufacturing the prism device of the present invention will be described with reference to the drawings.

1 to 3, reference numeral 11 denotes a prism device. The prism device 11 is used for color synthesis of a liquid crystal projector as a projector, and includes a cross prism 12 as a prism as an optical system and a cross prism 12 as a prism.
And a support base 14 for supporting the 12.

The cross prism 12 includes first to fourth right-angle prisms 21 and 2 as prism elements.
The rectangular surfaces of 2, 23, and 24 are bonded to face each other, and are integrally formed in a rectangular parallelepiped shape.

The right angle prisms 21, 22, 23,
An optical film having predetermined optical characteristics is provided on the surfaces to be bonded to each other, and in this embodiment, a dichroic mirror that reflects red color light R and transmits green color light G is used as a dichroic mirror that is an optical filter. A surface Dr and a dichroic surface Db that reflects blue color light B and transmits green color light G are formed by, for example, vacuum deposition of a dielectric multilayer film.

The first right-angle prism 21 is formed to be slightly longer than the other right-angle prisms 22, 23, 24. That is, when the cross prism 12 is formed by adhering the end faces of the four right-angle prisms 21, 22, 23, and 24, for example, with their upper end faces aligned, the cross prism 12 has an end face opposite to the aligned end faces. Adhered surface 12a which is the lower end surface
, The end face as the contact portion of the first right-angle prism 21
21a is the end face 22a, 23a, of the other right-angle prisms 22, 23, 24,
It is in a state protruding beyond 24a.

The support base 14 can be called a prism base or a prism support base, and is assembled to a housing of a liquid crystal projector (not shown) using a fixing tool such as a screw. The support base 14 includes a main body 26 having a substantially flat plate shape. On the upper surface, which is one surface of the main body 26, a support surface 27 serving as a support portion on which the cross prism 12 is mounted is, for example, a horizontal surface. Is formed. And this support surface 27
Are formed in the same size and shape as the bonding surface 12a of the cross prism 12. Further, from the three edges of the main body 26, protruding pieces 28, which are positioning portions, are provided to project upward, respectively.

The cross prism 12 supports the surface to be bonded 12a from which the end surface 21a of the first right-angle prism 21 protrudes.
It is fixed to the support base 14 toward 27. That is, in this state, the first, second, and fourth right angle prisms 21,
The first and second prisms 22 and 24 are positioned by being locked by the protruding pieces 28, respectively.
Abutting on 27 and the second to fourth right-angle prisms
Filling and curing of ultraviolet curing resin (UV curing resin) 32, 33, 34 as a filler in the space 30 between the end surfaces 22a, 23a, 24a of 22, 23, 24 and the support surface 27, and bonding and fixing. Thus, a prism device 11 is configured.

The end face 21a of the first rectangular prism 21
The projection size of the right-angle prisms 22, 23, 24 from the end faces 22a, 23a, 24a is set according to the properties such as the viscosity of the ultraviolet curing resin 32, 33, 34. In the present embodiment, The volume change of the UV-curable resin is set by using the "Hard Rock PC2" (trade name, manufactured by Denki Kagaku Kogyo Co., Ltd.) as the curable resin 32, 33, 34 and setting the protrusion size to about 0.1 mm to 0.3 mm. It was able to be fixed securely while suppressing the influence of.

In the prism device 11 configured as described above, the first right-angled prism 21 is directed toward a projection optical system (photographing optical system) (not shown), and the support base 14 is positioned at a predetermined position on the housing of the liquid crystal projector. Fixed. Further, the liquid crystal projector has a light source, white light of red color light R, green color light G,
A dichroic mirror that separates the blue color light B, three liquid crystal display panels as modulation means that respectively modulate the separated color light, and the like are provided.

In this state, the modulated red color light R is applied to the second right-angle prism 22, the modulated green color light G is applied to the third right-angle prism 23, and the modulated red light R is applied to the fourth right-angle prism 24. Each of the blue color lights B enters, is reflected or transmitted by the dichroic surfaces Dr and Db for each color light, and the RGB color lights are combined into one light flux, and the first right-angle prism 21 is formed.
From the screen and projected through the projection optical system (screen)
The enlarged projection image is projected.

Next, the manufacturing process of the prism device 11 will be described.

First, each right angle prism 21, 22, 23, 24
It is made by cutting a rod-shaped right-angle prism to a desired length, and the lower end surfaces 21a, 22a, 23a, 24a and the upper end surface which are cut surfaces of the right-angle prisms 21, 22, 23, 24 are Each of them is cut at right angles to the inclined surface on which the dichroic surfaces Dr and Db are formed and the right angle plane which becomes the incident plane or the exit plane.

The first rectangular prism 21 is formed to be slightly longer than the other rectangular prisms 22, 23, 24.

Next, the right-angled surfaces of the first to fourth right-angle prisms 21, 22, 23, and 24 are bonded to face each other to form the cross prism 12. At this time, the upper end surfaces of the right-angle prisms 21, 22, 23, and 24 are aligned in a plane, and the end surface 21a of the first right-angle prism 21 is connected to the other right-angle prisms 22,
23, 24 are projected from the end faces 22a, 23a, 24a.

The cross prism 12 has an end face 21a of the first right-angle prism 21 protruding from the bonded face 12a facing the support surface 27, and a projecting end face of the first right-angle prism 21.
It is placed on the support surface 27 so that the entire surface of the 21a is in contact with the support surface 27. In this state, the inclined surfaces of the first, second, and fourth right-angle prisms 21, 22, and 24 are locked by the projecting pieces 28 and positioned.

Then, as described above, the first right-angle prism 21
When the end surface 21a of the first right-angle prism 21 is in contact with the support surface 27, the end surface 21a of the first right-angle prism 21 projects beyond the end surfaces 22a, 23a, and 24a of the other right-angle prisms 22, 23, and 24. End faces 22a, 23a, 24 of the fourth right-angle prisms 22, 23, 24
A space (space) 30 is formed between a and the support surface 27.

The space 30 is filled with an ultraviolet curable resin (UV curable resin) 32, 33, 34 as a filler, and is cured by irradiating ultraviolet light, and the cross prism 12 is mounted on the support base 14.
Adhesively fixed.

That is, in this state, the cross prism 12
Is the end surface 21a of the first right-angle prism 21 with respect to the support base 14.
Is fixed to the support base 14 while being supported on the basis of.

As described above, according to the cross prism supporting structure of the present embodiment, any one of the prism elements, that is, the first right angle in the present embodiment, is used for the end surface 12a of the cross prism 12 on the support base 14 side. The end face 21a of the prism 21 is made to protrude beyond the end faces 22a, 23a, 24a of the other right-angle prisms 22, 23, 24, and comes into contact with the support surface 27 of the support base 14, and the cross prism 12 is supported based on this contact portion. By supporting on the table 14, the end faces 21a, 22 of the right-angle prisms 21, 22, 23, 24
Even if a, 23a and 24a are not exactly flush,
The cross prism 12 can be easily and accurately positioned and fixed at a desired position without tilting, preventing pixel shift and the like,
Optical characteristics can be improved.

For this reason, there is no need for a polishing process for polishing and leveling the end face of the cross prism 12, and the manufacturing process can be simplified and the manufacturing cost can be reduced.

Further, in the above embodiment, the support surface 27 of the support base 14 is flat, but the present invention is not necessarily limited to this configuration, and a concave portion or a projecting portion may be formed.

For example, like the support base 14 shown in FIGS. 4 and 5, a recess 41 is formed at a position facing the end faces 22a, 23a, 24a of the second to fourth right-angle prisms 22, 23, 24.
UV-curable resin 32, 3
Adhesion regions 32a, 33a, and 34a, which are the application regions of 3, 34, can also be formed.

In the configuration in which the concave portion 41 is formed as described above, the application area of the ultraviolet curable resin can be reduced, and as a result, the cross prism 12 and the ultraviolet curable resin and the crosslink due to the difference in expansion amount between the ultraviolet curable resin can be reduced. The cross-prism 12 is supported on the support base 14 by suppressing the separation of the adhesive surface from the prism 12.
Can be fixed firmly.

Further, a concave portion 41 is formed to form an adhesive region 32a,
By forming 33a and 34a, the application area of the ultraviolet curable resin can be easily made the same for the second to fourth right-angle prisms 22, 23 and 24, respectively. Of the cross prism 12 with respect to the support surface 27 can be suppressed, and the optical characteristics can be improved.

In the above embodiment, the end surface 21a of the cross prism 12 is provided with the end surface 21a protruding toward the support surface 27 of the support base 14. However, the present invention is not limited to this configuration. Instead of the end surface 21a which is the surface, or together with the end surface 21a which is the projecting surface of the cross prism 12, a contact portion can be provided so as to project from the support surface 27 side of the support base 14 to the cross prism 12 side.

For example, as shown in FIG. 6 to FIG. 8, the lower end face 12a of the cross prism 12 and the end face 21a of the first
The end faces 22a, 23a and 24a of the 22, 23 and 24 are not intentionally protruded and are substantially flush with each other.
From 27, a contact portion 27a, which is a convex portion, may be formed so as to contact the end surface 21a of the first right-angle prism 21 of the cross prism 12.

In this configuration, the support surface of the support
The contact portion 27a protruding from 27 is brought into contact with the end face 21a of the first right-angle prism 21 of the cross prism 12, and the cross prism 12 is supported on the support base 14 with reference to the contact portion, thereby obtaining the above-described configuration. The same operation and effect as those of the embodiment shown in FIG. 1 and the like can be obtained, and the cross prism 12 can be easily positioned and fixed easily, and the optical characteristics can be improved.

In each of the above-described embodiments, the filling of the ultraviolet curable resin is performed in such a manner that a predetermined amount of the ultraviolet curable resin is applied to a portion of the support surface 27 corresponding to the space 30 and supplied. In this case, the cross prism 12 may be placed on the support surface 27, or the ultraviolet light curable resin may be filled while the cross prism 12 is placed on the support surface 27.

Further, the ultraviolet curable resin 32, 3
The filling of 3, 34 is performed by the second to fourth right-angle prisms 22, 2
It is preferable to fill the end surfaces 22a, 23a, 24a of the base plates 3 and 24 and the support surface 27 so as to have substantially the same amount. Because of this configuration, even if the volume of the ultraviolet curable resin 32, 33, 34 changes due to a temperature change or the like, the volume change is equally applied to each of the right-angle prisms 22, 23, 24, and the ultraviolet curable resin 32, 33 Cross prism 12 due to volume change of 34
This is because the occurrence of inclination with respect to the support surface 27 can be suppressed, and the optical characteristics can be improved.

When the ultraviolet curable resin is cured, the protruding end surface 21a of the first right-angle prism 21 is placed on the supporting surface.
It is preferable to cure the ultraviolet curable resin in a state where the first right-angle prism 21 is positioned by pressing or the like on the support surface 27 side so that the resin is cured in a state where the resin is securely brought into contact with 27. Because UV curable resin changes its volume such as shrinkage when it is cured,
This is because the generation of the inclination of the cross prism 12 toward the ultraviolet curable resin or the like can be suppressed, and the optical characteristics can be improved.

Further, in each of the above-described embodiments, the first right-angle prism 21 is brought into direct contact with the support surface 27, and the ultraviolet curing resins 32, 33, and 34 are only filled in the space 30.
The ultraviolet curable resin is, for example, as shown by a broken line in FIG.
An ultraviolet curable resin A as an adhesive is applied between the end surface 12a of the first right-angle prism 21 and the support surface 27, and the like.
By bonding the support 12a and the support surface 27, the cross prism 12 can be more securely fixed. That is, the first right-angle prism 21 can be brought into direct contact with the support base 14 by being in direct contact with the support base 14 or through some member.

Then, the end surface 12a of the first right-angle prism 21
When the support and the support surface 27 are bonded with an ultraviolet-curable resin, it is preferable to cure the ultraviolet-curable resin A in this portion before curing the ultraviolet-curable resins 32, 33, and 34 for fixing other positions. Because, with this configuration, it is possible to omit the operation of positioning and holding the first right-angle prism 21 by pressing the first right-angle prism 21 at the time of curing the ultraviolet curing resins 32, 33, and 34 in other portions filling the space 30. This is because the manufacturing cost can be reduced.

In each of the above embodiments, the space 30
The cross prism 12 was adhered and fixed to the support base 14 with the ultraviolet curing resin 32, 33, 34 filled in the first rectangular prism 21. The end surface 12a of the first right-angle prism 21 and the supporting surface 27 or the contact surface 27a were fixed with the ultraviolet curing resin. In the case of bonding with sufficient strength by the bonding means such as A, the entire cross prism 12 may be supported by this bonding portion, and the space 30 may not be filled with a filler such as an ultraviolet curable resin.

According to the configuration in which the space portion 30 is not filled with the filler, any one of the end faces 12a of the cross prism 12 on the support base 14 side is provided similarly to the configuration of each of the above embodiments. One prism element, for example, the end face 21a of the first right-angle prism 21 is made to protrude beyond the end faces 22a, 23a, 24a of the other right-angle prisms 22, 23, 24, and the support surface of the support base 14
27, and the cross prism is
By supporting the support 12 on the support 14, each right-angle prism 2
Even if the end faces 21a, 22a, 23a, and 24a of 1, 22, 23, and 24 are not exactly flush, the cross prism 12 can be easily and accurately positioned and fixed at a desired position without tilting the pixel. The optical characteristics can be improved by preventing displacement and the like, and there is no need for a polishing process for polishing and leveling the end face of the cross prism 12, so that the manufacturing process can be simplified and the manufacturing cost can be reduced. Further, with this configuration, a filler is not required and the configuration is simplified, and the optical characteristics can be improved without being affected by a change in the volume of the filler filled in the space 30 or the like.

Further, in each of the above embodiments, the filler is not limited to the ultraviolet curable resin, but various resins, adhesives and the like can be used.

[0060]

According to the prism device of the first aspect,
For a prism support structure having a plurality of prism elements, one prism element is directly in contact with the support base to serve as a reference for positioning, and the other prism elements are adhered to the support base via a filler. In addition, the prism can be accurately positioned and fixed to the support table to improve the optical characteristics, and it is not necessary to increase the molding accuracy of the prism, thereby reducing the manufacturing cost.

According to the prism device of the second aspect, in addition to the effect of the first aspect, an adhesion area that adheres to another prism element via a filler is provided on a part of the support portion of the support base, not on the entire surface. Is provided, the amount of the filler can be easily reduced and adjusted, the displacement of the prism due to a change in the volume of the filler can be suppressed, and the optical characteristics can be improved.

According to the prism device of the third aspect, in addition to the effect of the first or second aspect, the prism is supported by bonding the direct contact portion between the prism element and the support with the bonding means. Can be more firmly supported by the table.

According to the prism apparatus of the fourth aspect, with respect to the prism support structure having a plurality of prism elements, one prism element is directly brought into contact with the support base to serve as a reference for positioning. Since the contact portion is adhered to support the entire prism and the other prisms are separated from the support, the prism can be accurately positioned and fixed to the support, thereby improving the optical characteristics. Further, there is no need to increase the molding accuracy of the prism, and the manufacturing cost can be reduced. Further, with this configuration, a filler is not required and the configuration can be simplified, and the optical characteristics can be improved without being affected by a change in volume of the filler.

According to the prism device of the fifth aspect, in addition to the effects of any one of the first to fourth aspects, a configuration in which one prism element directly abuts on the support base and is used as a reference for positioning can be easily achieved. Can be realized.

According to the prism apparatus of the sixth aspect, in addition to the effects of any one of the first to fourth aspects, a configuration in which one prism element is directly in contact with the support base and is used as a reference for positioning is facilitated. Can be realized.

According to the method of manufacturing a prism device according to the seventh aspect, with respect to a prism having a plurality of prism elements, one prism element is directly in contact with the support base to serve as a reference for positioning, and the other prism element is used as a reference. The element is adhered to the support via the filler, allowing the prism to be accurately positioned and fixed to the support, improving the optical characteristics and eliminating the need to increase the prism molding accuracy, reducing manufacturing costs. it can.

According to the manufacturing method of the prism device of the eighth aspect, in addition to the effect of the seventh aspect, the direct contact portion between the prism element and the support is bonded and fixed.
By filling and solidifying the filler between the other prism elements and the support, it is not necessary to keep holding the prism until the filler filled between the prism element and the support solidifies. Is simplified, and the manufacturing cost is reduced.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing one embodiment of a prism device and a method for manufacturing the prism device of the present invention.

FIG. 2 is a side view of the same prism device.

FIG. 3 is a plan view of the same prism device.

FIG. 4 is a perspective view of a support table showing another embodiment of the prism device and the method for manufacturing the prism device of the present invention.

FIG. 5 is a plan view of a support base of the cross prism device.

FIG. 6 is an exploded perspective view showing still another embodiment of the prism device and the method for manufacturing the prism device of the present invention.

FIG. 7 is a side view of the prism device.

FIG. 8 is a plan view of the prism device.

[Explanation of symbols]

 11 Prism device 12 Cross prism as prism 14 Support base 21, 22, 23, 24 Right angle prism as prism element 21a End face as contact part 27 Support surface as support part 27a Contact part 32, 33, 34 Filler UV curable resin 32a, 33a, 34a as bonding area A UV curable resin as bonding means

Claims (8)

[Claims] 1. A prism having a plurality of prism elements bonded to each other, and a support provided with a support for supporting the prism, wherein one prism element directly abuts on the support. Wherein the prism element is supported by being adhered to the support via a filler. 2. The prism device according to claim 1, wherein a bonding area for bonding to another prism element via a filler is provided in a part of the support portion of the support base. 3. The prism device according to claim 1, wherein a direct contact portion between the prism element and the support is bonded by bonding means. 4. A prism having a plurality of prism elements bonded to each other and a support provided with a support for supporting the prism, wherein one prism element directly abuts on the support. A prism device, wherein a contact portion is bonded by bonding means, and another prism element is separated from the support via a space. 5. The prism device according to claim 1, wherein one of the prism elements is provided with an abutting portion protruding from the other prism element toward the support portion. 6. The prism device according to claim 1, wherein an abutting portion that abuts one prism element protrudes from the support base. 7. A method for manufacturing a prism device, comprising: a prism in which a plurality of prism elements are bonded to each other; and a support for supporting the prism, wherein the prism is formed by bonding the plurality of prism elements to each other. Forming a prism, and directly supporting one of the prism elements constituting the prism by directly contacting the support, and filling and bonding a filler between the other prism elements and the support, and bonding the prism body A method for manufacturing a prism device, comprising a bonding step. 8. A direct contact portion between the prism element and the support base is adhered and fixed, and then a filler is filled between the other prism element and the support to be solidified. The method for manufacturing a prism device according to claim 7.