JP2007279145A - Rod integrator, manufacturing method therefor, and projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rod integrator which can be easily manufactured and can be made inexpensive, a manufacturing method therefor and a projector. <P>SOLUTION: The rod integrator 33 is a member which uniformizes an illuminance distribution of incident luminous flux and projects it. The rod integrator 33 has a sheet type member 331 having a reflective film 3311B formed on a surface of a flexible base body and the member is folded into a rectangular frame shape in plan view with the reflective film 3311B positioned inside. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a rod integrator, a manufacturing method thereof, and a projector.

2. Description of the Related Art Conventionally, a rod integrator that emits light with a uniform illuminance distribution of an incident light beam is known (see, for example, Patent Document 1).
In Patent Document 1, the following two types of rod integrators are employed.
That is, as the first rod integrator, the entire interior is formed of a translucent member, and the light incident from the light incident surface is reflected by total internal reflection due to the difference in the refractive index of the medium at the boundary of the rod side surface. It has a function of making the illuminance distribution of light emitted from the light exit surface and substantially uniform, guided to the exit surface. As such a 1st rod integrator, it manufactures by giving cutting and grinding | polishing etc. to translucent members, such as glass material, for example.
In addition, the second rod integrator is formed in a hollow shape whose inner side surface, also called a light tunnel, is covered with a reflection surface, and light is emitted while the light incident from the light incident surface is reflected by the reflection surface of the inner side surface. It has a function of making the illuminance distribution of light emitted from the light exit surface substantially uniform. Such a second rod integrator is manufactured, for example, by combining (bonding) a plurality of reflecting mirrors corresponding to the number of outer surfaces of the rod integrator.

JP 2004-38086 A

However, in the first rod integrator described above, it is necessary to process the rod side surface with high accuracy, and the processing becomes difficult. And it is difficult to reduce the manufacturing cost of a rod integrator by the material cost of a translucent member in addition to the processing cost of a rod integrator.
Similarly, in the second rod integrator described above, it is necessary to combine a plurality of reflecting mirrors with high accuracy, and it becomes difficult to process each reflecting mirror. And it is difficult to reduce the manufacturing cost of the rod integrator due to the material cost of each reflecting mirror in addition to the processing cost of each reflecting mirror.
Accordingly, there is a demand for a technique that facilitates the manufacture of the rod integrator and can reduce the cost.

  An object of the present invention is to provide a rod integrator, a manufacturing method thereof, and a projector that can be easily manufactured and can be manufactured at a low cost.

The rod integrator of the present invention is a rod integrator that emits light with uniform illuminance distribution of an incident light beam, and includes a sheet-like member having a reflective film formed on the surface of a flexible substrate, and the reflective film is disposed on the inner side. It is formed so as to be bent so as to have a rectangular frame shape in plan view located at the position.
Here, as the sheet-like member, a structure in which a material having a high reflectance such as aluminum or silver is formed as a reflective film on the surface of the base by vapor deposition, or a dielectric multilayer film is vapor-deposited as a reflective film on the surface of the base. The structure formed by can be illustrated. Moreover, as a sheet-like member, for example, an ESR film (manufactured by 3M) or Ref White RW (manufactured by Kimoto) can be employed.

  According to the present invention, in the rod integrator, the sheet-like member is formed by bending so that the reflective film has a rectangular frame shape in plan view located on the inner side. That is, in a sheet-like member having a rectangular frame shape in plan view, light incident from the light incident side end is guided to the light emission side end while being reflected by the inner reflective film, and emitted from the light emission side end. The illuminance distribution of the emitted light is made substantially uniform. Therefore, the rod integrator can be manufactured only by bending the sheet-like member so that the reflective film has a rectangular frame shape in plan view with the reflective film positioned inside. For this reason, manufacture of the rod integrator is facilitated, and the material cost and processing cost can be reduced, and the cost of the rod integrator can be reduced.

The rod integrator according to the present invention preferably includes a holding member that is connected to at least two outer faces of the four outer faces of the sheet-like member and holds the shape of the sheet-like member.
Here, the holding member may have any configuration as long as it is connected to at least two outer surfaces of the four outer surfaces of the sheet-like member, and may be formed as a single member or divided into a plurality of members.
According to the present invention, the rod integrator includes the holding member, and the holding member is connected to the two outer surfaces of the sheet-like member to hold the shape of the sheet-like member. Can be maintained well. For this reason, even when the rod integrator is used for a long time, the function of making the illuminance distribution of the incident light beam substantially uniform can be maintained well.

In the rod integrator of the present invention, the holding member includes a first holding member and a second holding member configured to be engageable with each other, and the first holding member and the second holding member are formed of the sheet-like member. It is preferable that each of the four outer surfaces is connected to each end surface facing each other.
In the present invention, the holding member is constituted by a first holding member and a second holding member that are respectively connected to end surfaces facing each other among the four outer surfaces of the sheet-like member. And the 1st holding member and the 2nd holding member are constituted so that engagement is possible. Thereby, in a state where the first holding member and the second holding member are connected to the sheet-like member, the engagement state of the first holding member and the second holding member is changed, that is, the mutual position is changed. The shape correction of the sheet-like member can be performed. Therefore, the shape of the sheet-like member is corrected by the holding member so that the incident light beam is not shielded at the light incident side end of the sheet-like member, and the illuminance distribution of the incident light beam is substantially uniform at the sheet-like member. It is possible to fit the sheet-like member into an optimum shape that can be made, and to maintain the sheet-like member satisfactorily with the optimum shape.

In the rod integrator of the present invention, it is preferable that the holding member is made of a heat conductive material and is connected to the sheet-like member so as to be able to transfer heat.
By the way, since the sheet-like member is configured to reflect the incident light beam by the reflection film, a part of the incident light beam is absorbed by the reflection film and converted into heat. That is, there is a possibility that the sheet-like member is thermally deteriorated due to overheating due to the long-term use of the rod integrator.
In the present invention, the holding member is made of a heat conductive material, and is connected to the sheet-like member so that heat can be transferred. Thus, the holding member functions as a so-called heat sink, and heat generated in the sheet-like member is transmitted to the holding member, and the sheet-like member can be prevented from being overheated.

In the rod integrator of the present invention, it is preferable that the sheet-like member is provided with a heat conductive member on the back surface side.
Here, as a heat conductive member, the structure etc. which vapor-deposited the heat diffusion films, such as a carbon sheet, and the member which has heat conductivity, such as a metal, on the back surface side of a base | substrate can be employ | adopted.
By the way, since the sheet-like member is configured to reflect the incident light beam by the reflection film, a part of the incident light beam is absorbed by the reflection film and converted into heat. That is, there is a possibility that the sheet-like member is thermally deteriorated due to overheating due to the long-term use of the rod integrator.

In the present invention, the sheet-like member is provided with a heat conductive member on the back side. Thereby, it is possible to avoid heat generated in the sheet-like member being transmitted to the heat conductive member and overheating the sheet-like member.
Further, if the holding member described above is provided in the rod integrator and the holding member is made of a heat conductive material, the heat conductive member provided on the back surface side of the sheet-like member and the holding member are connected so as to be able to transfer heat. The heat conductive member can reduce the thermal resistance in the heat transfer path of the sheet-like member to the holding member, and can effectively transfer the heat of the sheet-like member to the holding member, thereby improving the cooling efficiency of the sheet-like member. Can be improved.

  Further, if the first holding member and the second holding member described above are provided in the rod integrator, and the first holding member and the second holding member are made of a heat conductive material, the outer surface to which the holding member is connected is as described above. The heat conductive member can reduce the heat resistance in the heat transfer path of the sheet-like member to the holding member, and can effectively transfer the heat of the sheet-like member to the holding member. The heat of the sheet-like member can be transmitted to the heat-conductive member by the conductive member, the heat radiation characteristics can be improved on all four outer surfaces of the sheet-like member, and the cooling efficiency of the sheet-like member can be further improved.

In the rod integrator of the present invention, it is preferable that the sheet-like member has slits formed at four corners of the rectangular frame shape in plan view at the light incident side end and the light emission side end.
By the way, when the sheet-like member is bent and formed so as to have a rectangular frame shape in plan view, the light incident side end and the light emission side end of the sheet-like member due to distortion caused by bending and the stress of the sheet-like member It is difficult to make the shape of the rectangle into an optimal rectangular frame shape in plan view. When the light incident side end and the light emission side end of the sheet-like member do not have the optimal rectangular frame shape in plan view, the incident light beam is shielded at the light incident side end and light is emitted. In other words, the optical component disposed on the downstream side of the optical path of the rod integrator cannot be irradiated well.

  In the present invention, the sheet-like member is formed with slits at the four corners of the rectangular frame shape in plan view at the light incident side end and the light emission side end. As a result, when the sheet-like member is formed so as to have a rectangular frame shape in plan view, at the light incident side end and the light emission side end of the sheet-like member, the four outer surfaces are formed by each slit. Are in an independent state, the influence of stress applied from the other outer surface can be alleviated, and an optimal rectangular frame shape in plan view can be obtained. Therefore, it is possible to maintain the light utilization efficiency satisfactorily, to irradiate the emitted light beam to the optical component disposed on the rear side of the optical path, and to maintain the function of the rod integrator favorably.

In the method for manufacturing a rod integrator of the present invention, a sheet-like member having a reflective film formed on the surface of a flexible substrate is bent so that the reflective film has a rectangular frame shape in plan view with the reflective film positioned inside. A folding formation step is provided.
According to the present invention, since the method for manufacturing a rod integrator includes a bending process, it is possible to enjoy the same operations and effects as the rod integrator described above.

In the method for manufacturing a rod integrator according to the present invention, the rod integrator is configured to be engageable with each other, and is connected to each of end faces facing each other among the four outer surfaces of the sheet-like member to maintain the shape of the sheet-like member. A holding member connecting step of connecting the first holding member and the second holding member to an outer surface of the sheet-like member after the bending forming step, A shape correction step of changing the engagement state of the first holding member and the second holding member and correcting the shape of the sheet-like member, and a holding member fixing step of fixing the first holding member and the second holding member Are preferably provided.
According to the present invention, the manufacturing method of the rod integrator includes the holding member connecting step, the shape correcting step, and the holding member fixing step, so that it can enjoy the same operations and effects as the rod integrator described above.

The projector of the present invention includes a light source device, a rod integrator that emits light with a uniform illuminance distribution emitted from the light source device, and a light modulation device that modulates the light emitted from the rod integrator in accordance with image information. And a projection optical device that magnifies and projects the modulated light modulated by the light modulation device, wherein the rod integrator is manufactured by the rod integrator described above or the method for manufacturing the rod integrator described above. It is characterized by being a rod integrator.
According to the present invention, since the projector includes the rod integrator manufactured by the above-described rod integrator or the above-described rod integrator manufacturing method, the above-described rod integrator or the above-described rod integrator manufacturing method and You can enjoy similar actions and effects.
In addition, since the rod integrator that facilitates the manufacture and can reduce the cost is provided, the manufacturing cost of the projector can be reduced.

[First embodiment]
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, a first embodiment of the invention will be described with reference to the drawings.
[Configuration of projector]
FIG. 1 is a plan view schematically showing a schematic configuration of a projector 1 according to the present invention.
The projector 1 modulates a light beam emitted from a light source according to image information to form image light, and enlarges and projects the formed image light on a screen (not shown). As shown in FIG. 1, the projector 1 is roughly composed of an exterior housing 2, an optical device 3, and a projection lens 4 as a projection optical device.
Although not shown in FIG. 1, the interior of the projector 1 is cooled in a space other than the optical device 3 and the projection lens 4 in the exterior housing 2, and a power supply unit that supplies power to the constituent members of the projector 1. A cooling unit, a control device for controlling the entire projector 1, and the like are arranged.

The exterior housing 2 is a housing that houses and arranges the optical device 3, the projection lens 4, and the like. Although not specifically shown, the exterior casing 2 is an upper case that constitutes the top, front, back, and side surfaces of the projector 1 and a lower case that constitutes the bottom, front, back, and side surfaces of the projector 1. And are fixed to each other with screws or the like.
Although specifically described later, the optical device 3 optically processes a light beam emitted from a light source to form image light (color image) corresponding to image information.
The projection lens 4 is configured as a combined lens in which a plurality of lenses are combined. The projection lens 4 enlarges and projects the color image formed by the optical device 3 on a screen (not shown).

[Configuration of optical device]
As shown in FIG. 1, the optical device 3 includes three light source devices 31, three condenser lenses 32, three rod integrators 33, three liquid crystal panels 34 as light modulators, and three incident sides. A polarizing plate 35, three exit side polarizing plates 36, and a cross dichroic prism 37 are provided.
The three light source devices 31 are turned on under the control of the control device, and emit light beams toward the liquid crystal panels 34. As shown in FIG. 1, these light source devices 31 include an R color light LED (Light Emitting Diode) module 31R that emits R color light, a G color light LED module 31G that emits G color light, and a B color light that emits B color light. The LED module 31B for color light is arranged so as to face the three side surfaces of the cross dichroic prism 37, respectively.
Each of these LED modules 31R, 31G, and 31B has substantially the same configuration, and although not specifically illustrated, a plurality of LED elements that are solid light emitting elements are arrayed on a Si substrate. The LED elements constituting the LED modules 31R, 31G, and 31B are formed so that the types of crystals and additives are different, and emit R color light, G color light, and B color light, respectively.
The light source device 31 is not limited to the LED modules 31R, 31G, and 31B described above, and other configurations such as a laser diode, an organic EL (Electro Luminescence) element, and various solid light emitting elements such as a silicon light emitting element are employed. May be.

The three condensing lenses 32 have substantially the same configuration, and are arranged on the downstream side of the light path of each light source device 31 as shown in FIG. 1 to condense each color light emitted from each light source device 31. Thus, each rod integrator 33 on the rear side of the optical path is introduced into the inside from the light incident side end.
The three rod integrators 33 have substantially the same configuration. As shown in FIG. 1, the three rod integrators 33 are arranged on the downstream side of the optical path of each condenser lens 32, respectively, and each color light collected by each condenser lens 32 is collected. Each is incident, and the illuminance distribution of the incident light flux is made uniform and emitted.
The specific configuration of these rod integrators 33 will be described later.

The three incident-side polarizing plates 35 have substantially the same configuration, and are arranged on the downstream side of the optical path of each rod integrator 33, as shown in FIG. It transmits only polarized light and absorbs other light fluxes. These incident side polarizing plates 35 have a configuration in which a polarizing film is pasted on a translucent substrate such as sapphire glass or crystal.
The three liquid crystal panels 34 are respectively arranged on the rear side of the optical path of each incident-side polarizing plate 35. Although not specifically illustrated, liquid crystal as an electro-optical material is hermetically sealed in a pair of transparent glass substrates. In accordance with a drive signal from the control device, the alignment state of the liquid crystal is controlled, and the polarization direction of the polarized light beam emitted from the incident side polarizing plate 35 is modulated.

The three exit-side polarizing plates 36 have substantially the same configuration, and as shown in FIG. 1, the liquid crystal panels 34 on the rear side of the optical path of the liquid crystal panels 34 and the end surfaces of the light incident sides of the cross dichroic prism 37. Arranged in between. These emission side polarizing plates 36 have the same configuration as the incident side polarizing plate 35 and have a polarization direction orthogonal to the transmission axis of the light beams in the incident side polarizing plate 35 among the light beams emitted from the respective liquid crystal panels 34. Only the light beam is transmitted and other light beams are absorbed.
The cross dichroic prism 37 is an optical element that forms image light (color image) by synthesizing the modulated light modulated for each color light emitted from each emission-side polarizing plate 36. The cross dichroic prism 37 has a square shape in plan view in which four right angle prisms are bonded together, and two dielectric multilayer films are formed on the interface where the right angle prisms are bonded together. These dielectric multilayer films transmit the color light through the exit side polarizing plate 36 disposed on the side facing the projection lens 4 and reflect the respective color lights through the remaining two exit side polarizing plates 36. In this way, each color light modulated by each incident side polarizing plate 35, each liquid crystal panel 34, and each emission side polarizing plate 36 is combined to form a color image.

[Rod integrator configuration]
2 and 3 are diagrams showing a schematic configuration of the rod integrator 33. FIG. Specifically, FIG. 2 is a perspective view showing a schematic configuration of the rod integrator 33. FIG. 3 is an exploded perspective view showing a schematic configuration of the rod integrator 33. Hereinafter, the optical axis of the light beam incident on the rod integrator 33 is referred to as a Z axis, and two axes orthogonal to the Z axis are referred to as an X axis (horizontal axis) and a Y axis (vertical axis), respectively.
As shown in FIG. 2 or 3, the rod integrator 33 includes a sheet-like member 331 and a holding member 332.

FIG. 4 is a cross-sectional view showing the structure of the sheet-like member 331.
As shown in FIG. 4, the sheet-like member 331 includes a sheet-like member body 3311 having a reflective film 3311B formed on the surface of a flexible substrate 3311A such as a resin material, and a heat diffusion film as a heat conductive member. 3312. As this sheet-like member main body 3311, for example, a structure in which aluminum, silver or the like having a high reflectance is deposited on the base 3311A as a reflective film 3311B, or a dielectric multilayer film is deposited on the base 3311A as a reflective film 3311B. The structure etc. which were performed can be illustrated. Moreover, as this sheet-like member main body 3311, an ESR film (made by 3M company), Ref White RW (made by Kimoto company), etc. are employable, for example.

As shown in FIG. 4, the heat diffusion film 3312 is attached to the back surface side of the base 3311A and is connected to the sheet-like member body 3311 so as to be able to transfer heat. As this thermal diffusion film 3312, for example, a flexible carbon sheet can be adopted.
As shown in FIG. 2 or FIG. 3, the sheet-like member 331 is formed to be bent so that the reflective film 3311B has a rectangular frame shape in a plan view located inside.
Further, in this sheet-like member 331, slits 3313 are respectively formed at the four corners of the rectangular frame shape in plan view at the light incident side end and the light emission side end as shown in FIG. 2 or FIG. ing.

The holding member 332 is connected to at least two outer surfaces (in the present embodiment, opposite end surfaces) of the four outer surfaces of the sheet-like member 331 having a rectangular frame shape in plan view, and the shape of the sheet-like member 331 is changed. A member for correcting and holding. As shown in FIG. 2 or 3, the holding member 332 includes a first holding member 3321 and a second holding member 3322.
As shown in FIG. 2 or FIG. 3, the first holding member 3321 has the rod integrator 33 installed at a predetermined position inside the projector 1, and the upper outer surface of the sheet-like member 331 (in FIG. 2 or FIG. 3). , + Y-axis direction outer surface). As shown in FIG. 2 or 3, the first holding member 3321 includes two bodies, that is, an incident side holding portion 3321 </ b> A located on the light incident side of the rod integrator 33 and an emission side holding portion 3321 </ b> B located on the light emission side. Consists of.

As shown in FIG. 2 or 3, the incident side holding portion 3321 </ b> A has a substantially U shape in plan view, and the X-axis direction of the sheet-like member 331 in which the separation dimension of each U-shaped tip portion 3321 </ b> A <b> 2 is bent. It is set to be larger than the width dimension, and is connected to the inner side (light emission side) at a predetermined interval from the light incident side edge of the upper outer surface of the sheet-like member 331 at the U-shaped base end portion 3321A1. Further, the incident side holding portion 3321A can be engaged with each engagement portion described later of the second holding member 3322 at each U-shaped tip portion 3321A2.
In this incident side holding portion 3321A, two adhesive injection holes 3321A3 and two suction holes 3321A4 are formed in the U-shaped base end portion 3321A1 as shown in FIG.

  The exit side holding portion 3321B has the same shape as the entrance side holding portion 3321A, as shown in FIG. That is, as shown in FIG. 2 or FIG. 3, the exit-side holding portion 3321B is set such that the separation dimension of each U-shaped tip portion 3321B2 is larger than the width dimension in the X-axis direction of the sheet-like member 331 formed by bending, A U-shaped base end portion 3321B1 is connected to a position on the inner side (light incident side) at a predetermined interval from the light emitting side edge of the upper outer surface of the sheet-like member 331, and at each U-shaped distal end portion 3321B2. The second holding member 3322 can be engaged with engaging portions described later. Further, as shown in FIG. 2 or 3, the U-shaped base end portion 3321B1 of the emission side holding portion 3321B has two adhesive injection holes 3321B3 and two suction holes 3321B4 as in the case of the incident side holding portion 3321A. Is formed.

As shown in FIG. 2 or FIG. 3, the second holding member 3322 has the rod integrator 33 installed at a predetermined position inside the projector 1 and the lower outer surface of the sheet-like member 331 (in FIG. 2 or FIG. 3). , -Y-axis direction outer surface). As shown in FIG. 2 or 3, the second holding member 3322 includes a plate body 3322 </ b> A and four engaging portions 3322 </ b> B.
As shown in FIG. 2 or FIG. 3, the plate body 3322A is a plate body having a rectangular shape in plan view, and the lower side of the sheet-like member 331 on the upper side end surface (the end surface in the + Y-axis direction in FIG. 2 or 3). Connect to the outer side of the side. As shown in FIG. 2 or FIG. 3, the plate body 3322A has a length dimension in the Z-axis direction that is smaller than the length dimension in the Z-axis direction of the sheet-like member 331 formed by bending. The dimension is set to be larger than the width dimension in the X-axis direction of the sheet-like member 331 formed by bending.
In the plate 3322A, as shown in FIG. 3, there are four adhesive injection holes 3322A1 at positions corresponding to the four adhesive injection holes 3321A3 and 3321B3 and the four suction holes 3321A4 and 3321B4 in the first holding member 3321. And four suction holes 3322A2 are formed.

As shown in FIG. 2 or 3, the four engaging portions 3322B are erected from the X-axis direction both end sides of the upper end surface of the plate body 3322A toward the upper side (+ Y-axis direction side), and are first held. This is a portion that engages with the member 3321.
More specifically, of the four engaging portions 3322B, a pair of engaging portions 3322B1 located on the light incident side (the −Z-axis direction side in FIG. 2 or FIG. 3) is as shown in FIG. 2 or FIG. Further, the separation dimension in the X-axis direction is set larger than the width dimension in the X-axis direction of the bent sheet-like member 331 and smaller than the separation dimension of each U-shaped tip portion 3321A2 in the incident side holding portion 3321A. . In a state where the rod integrator 33 is assembled, the pair of engaging portions 3322B1 has a sheet-like member 331 disposed therebetween, and each U-shaped tip portion of the incident side holding portion 3321A at the outer peripheral portion in the X-axis direction. Engages with the inner peripheral portion of the X-axis direction of 3321A2.

  Similarly, the pair of engaging portions 3322B2 located on the light emission side (the + Z-axis direction side in FIG. 2 or FIG. 3) is also formed by bending the separation dimension in the X-axis direction as shown in FIG. 2 or FIG. It is set to be larger than the width dimension in the X-axis direction of the sheet-like member 331 and smaller than the separation dimension of each U-shaped tip portion 3321B2 in the ejection side holding portion 3321B. In a state where the rod integrator 33 is assembled, the pair of engaging portions 3322B2 has a sheet-like member 331 disposed therebetween, and each U-shaped tip portion of the ejection side holding portion 3321B at the outer peripheral portion in the X-axis direction. Engages with the inner peripheral portion of the X-axis direction of 3321B2.

  The holding member 332 described above is made of a heat conductive material such as metal (for example, aluminum), and in a state where it is connected to the sheet-like member 331, heat can be transferred to the heat diffusion film 3312 constituting the sheet-like member 331. Connecting.

[Rod integrator manufacturing method]
FIG. 5 is a flowchart for explaining a manufacturing method of the rod integrator 33.
6 to 8 are views for explaining a method of manufacturing the rod integrator 33. FIG. Specifically, FIG. 6 is a diagram for explaining the processes S1 to S5. FIG. 7 is a view for explaining the process S6, and is a view showing a cross section of the sheet-like member 331 and the holding member 332. FIG. 8 is a view for explaining the processes S7 and S8, and is a view of the rod integrator 33 as viewed from the light incident side.
In the following description, it is assumed that the thermal diffusion film 3312 described above is attached in advance to the back side of the sheet-like member main body as a large-sized sheet-like member.

First, using a press machine (not shown), as shown in FIG. 6A, a sheet-like member 331 ′ having an outer dimension of the sheet-like member 331 is cut out from the large-sized sheet-like member (Process S1).
In process S1, when cutting out sheet-like member 331 ', it carries out so that it may have the external dimension which considered the dimensional error accompanying bending (4 places) in the process mentioned below. Moreover, it implements so that it may have an external dimension including adhesion white 331A 'for performing temporary adhesion in the process mentioned later.

After processing S1, using the press machine, as shown in FIG. 6B, half-pressing is performed on the four bent portions 331B ′ of the sheet-like member 331 ′ to make creases (processing S2). ).
After processing S2, as shown in FIG. 6C, slits 3313 are respectively formed at both ends of the four bent portions 331B ′ of the sheet-like member 331 ′ using the press machine (processing S3). ).

After the process S3, the sheet-like member 331 ′ is bent at four folding points 331B ′ so that the reflective film 3311B has a rectangular frame shape in plan view where the reflective film 3311B is located inside as shown in FIG. 6D. (Process S4: Bending process).
After the process S4, an adhesive is applied to the adhesive white 331A ′, and as shown in FIG. 6D, the adhesive white 331A ′ is placed in the state where the sheet-like member 331 ′ has a rectangular frame shape in plan view. The sheet-like member 331 is formed by temporarily adhering to the back surface side of '(process S5).

After processing S5, the holding member 332 is connected to the outer surface of the sheet-like member 331 (processing S6: holding member connecting step).
More specifically, first, the lower outer surface of the sheet-like member 331 is brought into contact with the upper end surface of the plate body 3322A of the second holding member 3322. Thereafter, as shown in FIG. 7, the sheet-like member 331 is sucked by a suction device (not shown) through the four suction holes 3322A2 of the plate body 3322A, and the lower outer surface of the sheet-like member 331 is moved to the plate body 3322A. It is made to contact | abut to an upper side end surface. In this state, as shown in FIG. 7, an adhesive is injected into the four adhesive injection holes 3322A1 of the plate 3322A, and the second holding member 3322 is bonded and fixed to the sheet-like member 331.

Similarly, in the first holding member 3321, the U-shaped base end portions 3321 </ b> A <b> 1 and 3321 </ b> B <b> 1 of the incident side holding portion 3321 </ b> A and the emission side holding portion 3321 </ b> B are in contact with the upper outer surface of the sheet-like member 331. Thereafter, as shown in FIG. 7, the sheet-like member 331 is sucked by a suction device (not shown) through the suction holes 3321A4 and 3321B4 of the U-shaped base end portions 3321A1 and 3321B1, and the upper side of the sheet-like member 331 Are brought into contact with the U-shaped base end portions 3321A1 and 3321B1. In this state, as shown in FIG. 7, the adhesive is injected through the adhesive injection holes 3321A3 and 3321B3 of the U-shaped base end portions 3321A1 and 3321B1, and the first holding member 3321 is inserted into the sheet-like member 331. Adhere and fix. In addition, it does not specifically limit as an adhesive agent mentioned above, For example, a thermosetting adhesive and an ultraviolet curable adhesive can be illustrated.
In the above state, as shown in FIG. 8, the X of the U-shaped tip portions 3321A2 and 3321B2 of the first holding member 3321 with respect to the outer peripheral portion of the engaging portion 3322B of the second holding member 3322 in the X-axis direction. The axially inner peripheral portion is arranged in a loosely fitted state.

After the process S6, the engagement state of the U-shaped tip portions 3321A2 and 3321B2 in the first holding member 3321 with respect to the engaging portions 3322B in the second holding member 3322 is changed, that is, the first holding member 3321 and the second holding member 3322 are engaged. The mutual positions of the holding members 3322 are changed, and the shape of the sheet-like member 331 is corrected (processing S7: shape correction step).
More specifically, first, due to the weight of the first holding member 3321, as shown by the broken line in FIG. 8, the side end surfaces that intersect the horizontal direction (X-axis direction in FIG. 8) of the sheet-like member 331 and face each other. The first holding member 3321 is moved in the direction of the arrow R1 (the Y-axis direction in FIG. 8) with respect to the second holding member 3322 from the barrel-shaped state that protrudes outward. The sheet-like member 331 is interlocked with the movement of 3321.
Next, the first holding member 3321 is moved in the arrow R2 direction (X-axis direction in FIG. 8) with respect to the second holding member 3322, and the sheet-like member 331 is interlocked with the movement of the first holding member 3321.
As described above, the mutual positions of the first holding member 3321 and the second holding member 3322 are changed, and the shape of the sheet-like member 331 is corrected.

  In this process S7, for example, the first holding member 3321 and the second holding member 3321 and the second holding member 3331 are checked while visually confirming the plan view rectangular frame shape of the light incident side end and the plan view rectangular frame shape of the light emission side end. The shape of the sheet-like member 331 may be corrected by changing the mutual positions of the holding members 3322. In addition, for example, the first holding member is configured so that the luminous flux is introduced from the light incident side of the sheet-like member 331 and the illuminance distribution of the emitted luminous flux becomes uniform while confirming the illuminance of the luminous flux emitted from the light emitting side. The shape of the sheet-like member 331 may be corrected by changing the mutual positions of the 3321 and the second holding member 3322.

  In any method, in process S7, the size of the rectangular frame shape in plan view at the light incident side end of the sheet-like member 331 is such that all the light beams collected from the condenser lens 32 are applied to the sheet-like member 331. The shape correction of the sheet-like member 331 is performed so that the size can be taken in. Further, in the process S7, the rectangular frame shape in plan view of the light emitting side end portion of the sheet-like member 331 has a shape similar to the image forming area in the liquid crystal panel 34 disposed on the downstream side of the optical path and has a predetermined illuminance. The shape correction of the sheet-like member 331 is performed so as to have a margin. Then, after the process S7, the sheet-like member 331 has the outer side faces outward so that incident light beams are not shielded by the outer side faces that intersect in the horizontal direction (X-axis direction in FIG. 8) and face each other. It is preferable that the barrel shape becomes convex.

After correcting the shape of the sheet-like member 331 in the process S7, an adhesive is filled between the U-shaped tip portions 3321A2 and 3321B2 and the engaging portions 3322B, and the first holding member 3321 and the second holding member 3322 are fixed. (Processing S8: Holding member fixing step). In addition, it does not specifically limit as an adhesive agent mentioned above, For example, a thermosetting adhesive and an ultraviolet curable adhesive can be illustrated.
The rod integrator 33 is manufactured by the process as described above.

The first embodiment described above has the following effects.
In the present embodiment, the rod integrator 33 is formed by bending a sheet-like member 331 so that the reflective film 3311B has a rectangular frame shape in plan view where the reflective film 3311B is located inside. That is, in the sheet-like member 331 having a rectangular frame shape in plan view, light incident from the light incident side end is guided to the light emission side end while being reflected by the inner reflection film 3311B, and the light emission side end. The illuminance distribution of the light emitted from the lamp is made substantially uniform. Therefore, the rod integrator 33 can be manufactured simply by bending and forming the sheet-like member 331 so that the reflective film 3311B has a rectangular frame shape in plan view located on the inner side. For this reason, manufacture of the rod integrator 33 is facilitated, and the material cost and processing cost can be reduced, and the cost of the rod integrator 33 can be reduced. Further, since the cost of the rod integrator 33 can be reduced, the cost of the projector 1 can also be reduced.

  Further, since the rod integrator 33 includes a holding member 332 and the holding member 332 is connected to the two outer surfaces of the sheet-like member 331 to hold the shape of the sheet-like member 331, the sheet-like member 331 has a rectangular frame shape in plan view. The shape of can be maintained well. For this reason, even when the rod integrator 33 is used for a long period of time, the function of making the illuminance distribution of the incident light beam substantially uniform can be maintained well.

  Here, the holding member 332 includes a first holding member 3321 and a second holding member 3322 that are respectively connected to end surfaces facing each other among the four outer surfaces of the sheet-like member 331. And the 1st holding member 3321 and the 2nd holding member 3322 are comprised so that engagement is possible. Accordingly, the engagement state of the first holding member 3321 and the second holding member 3322 is changed in a state where the first holding member 3321 and the second holding member 3322 are connected to the sheet-like member 331, that is, the mutual position. The shape of the sheet-like member 331 can be corrected by changing the above. Therefore, the shape of the sheet-like member 331 is corrected by the holding member 332 so that the incident light flux is not blocked at the light incident side end of the sheet-like member 331 and the illuminance of the incident light flux is obtained by the sheet-like member 331. The sheet-like member 331 can be fitted into an optimum shape that can make the distribution substantially uniform, and the sheet-like member 331 can be favorably maintained with the optimum shape.

  Here, the first holding member 3321 includes an incident side holding portion 3321A connected to the vicinity of the light incident side end portion of the sheet-like member 331, and an emission side holding portion 3321B connected to the vicinity of the light emission side end portion of the sheet-like member 331. It consists of and. Therefore, by changing the mutual positions of the first holding member 3321 and the second holding member 3322, the rectangular frame shape in plan view of the light incident side end portion of the sheet-like member 331 and the light emission side which are required at the minimum The rectangular frame shape in plan view at the end can be adjusted to the optimum shape. Therefore, the weight reduction and cost reduction of the rod integrator 33 can be achieved by configuring the holding member 332 with a minimum necessary member.

  Further, the first holding member 3321 and the second holding member 3322 are formed with adhesive injection holes 3321A3, 3321B3, 3322A1 and suction holes 3321A4, 3321B4, 3322A2, respectively. The upper outer surface of the sheet-like member 331 can be reliably brought into contact with the base end portions 3321A1 and 3321B1, and the lower outer surface of the sheet-like member 331 is disposed on the upper end surface of the plate body 3322A of the second holding member 3322. It can contact reliably. Therefore, compared with a configuration in which the holding member is simply connected to the sheet-like member 331 with an adhesive, the surface accuracy of each of the upper and lower outer surfaces of the sheet-like member 331 is improved with a simple configuration, and the sheet The light incident side end and the light emission side end of the shaped member 331 can be easily fitted into an optimum shape.

  Further, the incident side holding portion 3321A is connected to the inner side at a predetermined interval from the light incident side edge of the upper outer surface of the sheet-like member 331. Further, the emission side holding portion 3321B is connected to the inner side at a predetermined interval from the light emission side edge of the upper outer surface of the sheet-like member 331. Furthermore, the plate body 3322A of the second holding member 3322 is set so that the length dimension in the Z-axis direction is smaller than the length dimension in the Z-axis direction of the sheet-like member 331 formed by bending. As a result, in a state where the rod integrator 33 is disposed inside the projector 1, the holding member 332 is attached to the condenser lens 32 and the incident side polarizing plate 35 disposed on the front side and the rear side of the optical path of the rod integrator 33, respectively. Mechanical interference can be avoided and the layout of the rod integrator 33 is facilitated.

By the way, since the sheet-like member 331 is configured to reflect the incident light beam by the reflection film 3311B, a part of the incident light beam is absorbed by the reflection film 3311B and converted into heat. That is, there is a possibility that the sheet-like member 331 is thermally deteriorated due to overheating due to the long-term use of the rod integrator 33.
In the present embodiment, the holding member 332 is made of a heat conductive material, and is connected to the sheet-like member 331 so that heat can be transferred. As a result, the holding member 332 functions as a so-called heat sink, and heat generated in the sheet-like member 331 is transmitted to the holding member 332, so that the sheet-like member 331 can be prevented from being thermally deteriorated due to overheating.

The sheet-like member 331 is provided with a heat diffusion film 3312 on the back side. As a result, heat generated in the sheet-like member 331 is transmitted to the heat diffusion film 3312 and is diffused by the heat diffusion film 3312, and heat can be avoided from being applied to a part of the sheet-like member 331. Can be prevented from thermal degradation due to overheating.
Furthermore, since the heat diffusion film 3312 and the holding member 332 are connected to each other on the upper and lower outer surfaces of the sheet-like member 331 so that heat can be transferred, the sheet-like member 331 to the holding member are connected by the heat diffusion film 3312. The heat resistance in the heat transfer path 332 can be reduced, and the heat of the sheet-like member 331 can be effectively transferred to the holding member 332. Further, as described above, the heat generated in the sheet-like member 331 can be transmitted to the thermal diffusion film 3312 on the outer surfaces of the sheet-like member 331 that intersect in the horizontal direction and face each other. Therefore, the heat radiation characteristics can be improved on all four outer surfaces of the sheet-like member 331, and the cooling efficiency of the sheet-like member 331 can be improved.

By the way, when the sheet-like member is bent and formed so as to have a rectangular frame shape in plan view, the light incident side end and the light emission side end of the sheet-like member due to distortion caused by bending and the stress of the sheet-like member It is difficult to make the shape of the rectangle into an optimal rectangular frame shape in plan view. When the light incident side end and the light emission side end of the sheet-like member do not have the optimal rectangular frame shape in plan view, the incident light beam is shielded at the light incident side end and light is emitted. In other words, the liquid crystal panel 34 disposed on the downstream side of the optical path of the rod integrator cannot be irradiated well.
In the present embodiment, the sheet-like member 331 is provided with slits 3313 at the four corners of the rectangular frame in plan view at the light incident side end and the light emission side end. As a result, when the sheet-like member 331 is formed to be bent so as to have a rectangular frame shape in plan view, four slits 3313 form four slits 3313 at the light incident side end and the light emission side end of the sheet-like member 331. The outer side surfaces become independent from each other, and the influence of stress applied from the other outer side surface can be alleviated, so that an optimal rectangular frame shape in plan view can be obtained. Therefore, the light utilization efficiency can be maintained well, the emitted light beam can be irradiated onto the liquid crystal panel 34, and the function of the rod integrator 33 can be maintained well.

[Second Embodiment]
Next, 2nd Embodiment of this invention is described based on drawing.
In the following description, the same structure and the same members as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted or simplified.
FIG. 9 is a cross-sectional view showing the structure of the rod integrator 43 in the second embodiment.
In this embodiment, as the holding member 432 constituting the rod integrator 43, the rod integrator 33 described in the first embodiment is made of a translucent material such as glass or acrylic, and as shown in FIG. Only the plurality of suction holes 4321A4, 4321B4, and 4322A2 are provided, and the adhesive injection holes 3321A3, 3321B3, and 3322A1 are omitted. The holding member 432 is the same as the holding member 332 described in the first embodiment except that the material is changed and the adhesive injection holes 3321A3, 3321B3 and 3322A1 are omitted. That is, the holding member 432 includes the first holding member 3321 (including the incident side holding portion 3321A and the emission side holding portion 3321B) and the second holding member 3322 (the plate body 3322A and the third holding member 3322B) of the holding member 332 described in the first embodiment. The first holding member 4321 (including the incident side holding portion 4321A and the emission side holding portion 4321B) and the second holding member 4322 (including the plate body 4322A and the engaging portion 4322B) are the same as the engaging portion 3322B. Prepare. The other configurations of the rod integrator 43 and the projector 1 are the same as those in the first embodiment.

In the present embodiment, the holding member 432 is connected to the outer surface of the sheet-like member 331 in the process S6 described in the first embodiment as described below.
That is, first, an ultraviolet curable adhesive is applied to the lower outer surface of the sheet-like member 331, and the sheet-like material is formed on the upper end surface of the plate body 4322A in the second holding member 4322 in a state where the adhesive is uncured. The outer surface on the lower side of the member 331 is brought into contact. Thereafter, as shown in FIG. 9, the sheet-like member 331 including the ultraviolet curable adhesive is sucked by a suction device (not shown) through the suction hole 4322A2 of the plate body 4322A. In this state, as shown in FIG. 9, ultraviolet rays are irradiated toward the second holding member 4322 from an ultraviolet irradiation device (not shown). The irradiated ultraviolet rays are irradiated to the ultraviolet curable adhesive filled between the second holding member 4322 and the sheet-like member 331 via the second holding member 4322, and the adhesive is cured, so that the sheet-like member is cured. A second holding member 4322 is bonded and fixed to 331.

Next, an ultraviolet curable adhesive is applied to the upper outer surface of the sheet-like member 331, and the incident-side holding portion 4321A and the emission-side holding constituting the first holding member 4321 are in an uncured state. The U-shaped base end portions 4321A1 and 4321B1 in the portion 4321B are brought into contact with the upper outer surface of the sheet-like member 331. Thereafter, as shown in FIG. 9, the sheet-like member 331 including the ultraviolet curable adhesive is sucked by a suction device (not shown) through the suction holes 4321A4 and 4321B4 of the U-shaped base end portions 4321A1 and 4321B1. To do. In this state, as shown in FIG. 9, ultraviolet rays are irradiated toward the first holding member 4321 from an ultraviolet irradiation device (not shown). The irradiated ultraviolet rays are irradiated to the ultraviolet curable adhesive filled between the first holding member 4321 and the sheet-like member 331 through the first holding member 4321, and the adhesive is cured, and the sheet-like member is cured. The first holding member 4321 is bonded and fixed to 331.
In addition, the manufacturing method of the rod integrator 43 in this embodiment differs from the manufacturing method of the rod integrator 33 described in the first embodiment only in the process S6 described above, and the other steps are the same.

The second embodiment described above has the following effects in addition to the same effects as those of the first embodiment.
In the present embodiment, since the adhesive injection holes 3321A3, 3321B3, 3322A1 are omitted and only the suction holes 4321A4, 4321B4, 4322A2 are formed in the holding member 432, UV curing is performed through the suction holes 4321A4, 4321B4, 4322A2. The sheet-like member 331 can be inhaled while inhaling the mold adhesive, and the bonding area between the holding member 432 and the sheet-like member 331 can be increased. For this reason, the fixing state of the sheet-like member 331 and the holding member 432 is made strong, and the shape of the sheet-like member 331 can be more favorably maintained by the holding member 432.
In addition, since the holding member 432 is made of a translucent member, the ultraviolet curable adhesive filled between the holding member 432 and the sheet-like member 331 can be irradiated via the holding member 432, The sheet-like member 331 and the holding member 432 can be easily fixed.

[Third embodiment]
Next, 3rd Embodiment of this invention is described based on drawing.
In the following description, the same structure and the same members as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted or simplified.
FIG. 10 is a diagram showing the structure of the rod integrator 53 in the third embodiment. Specifically, FIG. 10 is a diagram of the rod integrator 53 viewed from the light incident side.
In the present embodiment, as the holding member 532 constituting the rod integrator 53, a part of the holding member 532 that constitutes the rod integrator 53, as shown in FIG. It consists of members. Except that the configuration of the holding member 532 constituting the rod integrator 53 is different, the configuration is the same as that of the first embodiment.

More specifically, the holding member 532 includes the first holding member 3321 (including the incident side holding portion 3321A and the emission side holding portion 3321B) and the second holding member 3322 (plate) of the holding member 332 described in the first embodiment. The first holding member 5321 (including the incident side holding portion 5321A and the emission side holding portion 5321B) and the second holding member 5322 (including the plate body 5322A and the engaging portion 5322B) are the same as the body 3322A and the engaging portion 3322B. Including). Of the first holding member 5321 and the second holding member 5322, the second holding member 5322 is integrally formed on the bottom surface of the exterior casing 2 as shown in FIG.
Although not shown, the first holding member 5321 is formed with adhesive injection holes and suction holes similar to the adhesive injection holes 3321A3 and 3321B3 and the suction holes 3321A4 and 3321B4 described in the first embodiment. ing. Similarly, an adhesive injection hole and a suction hole similar to the adhesive injection hole 3322A1 and the suction hole 3322A2 described in the first embodiment are formed in the second holding member 5322 (the bottom surface of the exterior casing 2). .
That is, the manufacturing method of the rod integrator 53 in the present embodiment is the same as the manufacturing method of the rod integrator 33 described in the first embodiment.

The third embodiment described above has the following effects in addition to the same effects as those of the first embodiment.
In the present embodiment, since the second holding member 5322 of the holding member 532 constituting the rod integrator 53 is integrally formed on the bottom surface of the exterior casing 2, the member constituting the rod integrator 53 (second holding member 5322). Can be a common component with other components of the projector 1. For this reason, it is possible to reduce the cost and weight of the projector 1 by omitting the members.

[Fourth embodiment]
Next, 4th Embodiment of this invention is described based on drawing.
In the following description, the same structure and the same members as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted or simplified.
FIG. 11 is a diagram showing the structure of the rod integrator 63 in the fourth embodiment. Specifically, FIG. 11 is a view of the rod integrator 63 viewed from the light incident side.
In the present embodiment, as the holding member 632 constituting the rod integrator 63, as compared with the rod integrator 33 described in the first embodiment, as shown in FIG. 11, the incident side holding portion 3321A in the first holding member 3321 and A plurality of fin-like members 6321 are provided on the outer surfaces of the U-shaped base end portions 3321A1 and 3321B1 of the ejection side holding portion 3321B, and a plurality of fin-like members 6322 are provided on the lower end surface of the plate 3322A in the second holding member 3322. Provided. The present embodiment is the same as the first embodiment except that a plurality of fin-like members 6321 and 6322 are provided.

As shown in FIG. 11, the plurality of fin-shaped members 6321 are erected at predetermined intervals from the U-shaped base end portions 3321 </ b> A <b> 1 and 3321 </ b> B <b> 1 of the first holding member 3321. The base end portions 3321A1 and 3321B1 are integrally formed.
As shown in FIG. 11, the plurality of fin-like members 6322 are erected from the lower end surface of the plate body 3322A of the second holding member 3322 to the lower side at a predetermined interval, and are integrated with the plate body 3322A. Is formed.
That is, the holding member 632 is configured as a so-called heat sink that smoothly performs heat exchange with the outside air by the plurality of fin-like members 6321 and 6322.

The fourth embodiment described above has the following effects in addition to the same effects as those of the first embodiment.
In the present embodiment, since the holding member 632 constituting the rod integrator 63 is provided with a plurality of fin-like portions 6321 and 6322, the heat transmitted from the sheet-like member 331 to the holding member 632 is provided with the plurality of fin-like portions. Heat can be radiated to the outside air through 6321 and 6322. For this reason, it can avoid that the temperature of the holding member 632 rises, the heat transfer efficiency from the sheet-like member 331 to the holding member 632 can be improved, and the sheet-like member 331 can be cooled favorably. In particular, for example, cooling air is sent to the rod integrator 63 (a plurality of fin-like members 6321 and 6322) by a cooling fan constituting the cooling unit, or in the vicinity of the rod integrator 63 (a plurality of fin-like members 6321 and 6322). ), The above-described effects can be suitably achieved.

Although the present invention has been described with reference to preferred embodiments, the present invention is not limited to these embodiments, and various improvements and design changes can be made without departing from the scope of the present invention. It is.
In the above-described embodiments, the rod integrators 33, 43, 53, and 63 are configured to include the holding members 332, 432, 532, and 632, but the present invention is not limited thereto, and the holding members 332, 432, 532, and 632 are provided. The configuration may be omitted.

In each of the above-described embodiments, the holding members 332, 432, 532, and 632 have been described as being connected to two outer surfaces facing each other among the four outer surfaces of the sheet-like member 331. However, the present invention is not limited to this.
For example, in each of the above-described embodiments, the holding members 332, 432, 532, and 632 are composed of two bodies of the first holding members 3321, 4321, and 5321 and the second holding members 3322, 4322, and 5322. It is formed as a single unit and has a substantially L shape in plan view. Then, the holding member is connected to two adjacent outer surfaces of the sheet-like member 331.
Further, for example, one of the first holding member and the second holding member constituting the holding member is connected to two adjacent outer surfaces of the sheet-like member 331. That is, in this configuration, the holding member is connected to three outer surfaces of the four outer surfaces of the sheet-like member 331.

In each of the above embodiments, the engagement structure of the first holding members 3321, 4321, 5321 and the second holding members 3322, 4322, 5322 is not limited to the engagement structure described in the above embodiments, but other engagement structures. May be adopted.
In each of the above-described embodiments, when there is sufficient space between the rod integrators 33, 43, 53, and 63 and the optical components disposed on the upstream side or the downstream side of the optical path, the first holding members 3321 and 4321 are provided. , 5321 and the second holding members 3322, 4322, 5322 may be connected along the light incident side edge and the light emission side edge of each of the upper and lower outer surfaces of the sheet-like member 331. In such a configuration, it is not necessary to form the slit 3313 in the sheet-like member 331.

  In each said embodiment, although the holding members 332,432,532,632 were comprised with the metal and the translucent member, the material is not specifically limited. For example, the holding member may be a molded product formed by molding a synthetic resin material.

In each said embodiment, although the thermal-diffusion film 3312 was employ | adopted as a heat conductive member, it is not restricted to this. For example, a configuration in which a member such as a metal is formed on the back side of the base body 3311A by vapor deposition or the like may be employed as the heat conductive member.
In each of the above embodiments, the heat diffusion film 3312 is attached to the back side of the sheet-like member main body 3311. However, the object of the present invention can be sufficiently achieved even with the configuration in which the heat diffusion film 3312 is omitted.

In the third embodiment, the configuration of the holding member 532 may be the same as that of the second embodiment. That is, the holding member 532 may be configured with a light-transmitting member and the adhesive injection hole may be omitted. The same applies to the fourth embodiment.
In the fourth embodiment, the configuration of the holding member 632 may be the same as that of the third embodiment. That is, the second holding member 3322 constituting the holding member 632 is integrally formed on the bottom surface of the exterior casing 2.
In the third embodiment, the second holding member 5322 is integrally formed on the bottom surface of the exterior casing 2. However, the present invention is not limited to this, and the second holding member 5322 may be formed integrally with other components of the projector 1. . For example, when the optical device 3 is provided with an optical component housing that houses and arranges the optical components 31 to 37 therein, the second holding member 5322 is integrated with the bottom surface of the optical component housing. It may be formed.

  In each said embodiment, although LED module 31R, 31G, 31B was used as the light source device 31, it is not restricted to this, You may employ | adopt a discharge light emission type light source lamp. In such a configuration, only one rod integrator 33, 43, 53, 63 is disposed on the downstream side of the optical path of the light source lamp, and a dichroic mirror or the like is disposed on the downstream side of the optical path of the rod integrator 33, 43, 53, 63. A color separation optical system for separating the incident light beam into R, G, and B color light by combining the above may be provided.

In each of the above embodiments, the transmissive liquid crystal panel 34 is employed. However, the present invention is not limited to this, and a reflective liquid crystal panel may be employed, or a digital micromirror device (Texas Instruments). May be adopted).
In each of the embodiments described above, the three liquid crystal panels 34 are provided. However, the present invention is not limited to this, and only one liquid crystal panel 34 is provided. Two liquid crystal panels 34 are provided. Four or more liquid crystals are provided. You may employ | adopt the structure which provides a panel.
In each of the above embodiments, only an example of a front type projector that performs projection from the direction of observing the screen has been described, but the present invention also applies to a rear type projector that performs projection on the side opposite to the direction of observing the screen. Applicable.

The best configuration for implementing the present invention has been disclosed in the above description, but the present invention is not limited to this. That is, the invention has been illustrated and described primarily with respect to particular embodiments, but may be configured for the above-described embodiments without departing from the scope and spirit of the invention. Various modifications can be made by those skilled in the art in terms of materials, quantity, and other detailed configurations.
Therefore, the description limited to the shape, material, etc. disclosed above is an example for easy understanding of the present invention, and does not limit the present invention. The description by the name of the member which remove | excluded the limitation of one part or all of such is included in this invention.

  Since the rod integrator of the present invention can be easily manufactured and can be manufactured at a low cost, it can be used for a projector used in presentations, home theaters, and the like.

FIG. 2 is a plan view schematically showing a schematic configuration of the projector in the first embodiment. The figure which shows schematic structure of the rod integrator in the said embodiment. The figure which shows schematic structure of the rod integrator in the said embodiment. Sectional drawing which shows the structure of the sheet-like member in the said embodiment. The flowchart explaining the manufacturing method of the rod integrator in the said embodiment. The figure for demonstrating the manufacturing method of the rod integrator in the said embodiment. The figure for demonstrating the manufacturing method of the rod integrator in the said embodiment. The figure for demonstrating the manufacturing method of the rod integrator in the said embodiment. Sectional drawing which shows the structure of the rod integrator in 2nd Embodiment. The figure which shows the structure of the rod integrator in 3rd Embodiment. The figure which shows the structure of the rod integrator in 4th Embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Projector, 4 ... Projection lens (projection optical apparatus), 31 ... Light source device, 34 ... Liquid crystal panel (light modulation apparatus), 33, 43, 53, 63 ... Rod integrator, 331: Sheet-like member, 332, 432, 532, 632 ... Holding member, 3311A ... Base, 3311B ... Reflective film, 3312 ... Thermal diffusion film (thermally conductive member), 3313 ..Slit, 3321, 4321, 5321 ... first holding member, 3322, 4322, 5322 ... second holding member, S4 ... bending process, S6 ... holding member connecting step, S7 ... shape correction step, S8 ... holding member fixing step.

Claims (9)

A rod integrator that emits light with uniform illuminance distribution of incident light flux,
A sheet-like member having a reflective film formed on the surface of a flexible substrate;
A rod integrator, wherein the reflective film is bent so as to have a rectangular frame shape in plan view located inside. The rod integrator according to claim 1,
A rod integrator, comprising: a holding member that is connected to at least two outer faces of the four outer faces of the sheet-like member and holds the shape of the sheet-like member. The rod integrator according to claim 2,
The holding member includes a first holding member and a second holding member configured to be engageable with each other,
The first integrator and the second holder are connected to respective end faces facing each other among the four outer faces of the sheet-like member. In the rod integrator according to claim 2 or claim 3,
The said holding member is comprised from a heat conductive material, and is connected to the said sheet-like member so that heat transfer is possible, The rod integrator characterized by the above-mentioned. In the rod integrator in any one of Claims 1-4,
A rod integrator characterized in that the sheet-like member is provided with a heat conductive member on the back side. In the rod integrator according to any one of claims 1 to 5,
A rod integrator, wherein the sheet-like member is formed with slits at four corners of a rectangular frame shape in plan view at a light incident side end and a light emission side end. A method of manufacturing a rod integrator that emits light with uniform illumination distribution of incident light flux,
A bending step of bending a sheet-like member having a reflective film formed on the surface of a flexible substrate so that the reflective film has a rectangular frame shape in a plan view located inside. A method for manufacturing a rod integrator, which is characterized. In the manufacturing method of the rod integrator according to claim 7,
The rod integrator is configured to be engageable with each other, and is connected to each of the end surfaces facing each other among the four outer surfaces of the sheet-like member, and holds the shape of the sheet-like member. With
A holding member connecting step of connecting the first holding member and the second holding member to an outer surface of the sheet-like member after the bending formation step;
A shape correction step of changing the engagement state of the first holding member and the second holding member and correcting the shape of the sheet-like member;
A method for manufacturing a rod integrator, comprising: a holding member fixing step for fixing the first holding member and the second holding member. Light source device, rod integrator that emits light with uniform illuminance distribution emitted from light source device, light modulator that modulates light emitted from rod integrator according to image information, and light modulator A projector having a projection optical device for enlarging and projecting the modulated light modulated by
The rod integrator is a rod integrator according to any one of claims 1 to 6, or a rod integrator manufactured by the method for manufacturing a rod integrator according to claim 7 or claim 8. Projector.

Images