JP2005316025A - Mounting structure of transmission screen and rear projection display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To effectively suppress the occurrence of a stain by substantially preventing the occurrence of the tooth crushing of a Fresnel lens section. <P>SOLUTION: The mounting structure is provided with a restraining means for restraining a lenticular lens sheet 40 from elongating in its face direction. The restraining means is constituted as a pressing means for pressing an outer peripheral side portion of the transmission screen 20 in its thickness direction. The pressing means is constituted as a spacer 60 interposed on at least the one surface side in the outer peripheral portion of the transmission screen 20. The spacer 60 is constituted as an elastic body of a compressed state. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an attachment structure for attaching a transmissive screen to a fixed frame of a housing in a rear projection display device such as a rear projection television.

  In general, a rear projection television known as a rear projection display device equipped with a transmissive screen is a rear surface of a transmissive screen that is formed into a substantially rectangular flat plate by reflecting image light projected from a projector as a light source by a reflecting mirror. , The observer located on the front side of the transmissive screen can observe the image light transmitted through the transmissive screen and emitted.

The transmission type screen has a Fresnel lens having a Fresnel lens portion that adjusts the direction of incident light to be emitted light, and a lenticular lens having a diffusion lens portion that diffuses light emitted from the Fresnel lens in the left-right direction (horizontal direction) of the screen. A lens sheet (diffuse lens sheet) and a diffusion layer that diffuses light emitted from the lenticular lens sheet in the vertical direction (vertical direction) of the screen are provided.
Such a transmissive screen is attached to the fixed frame of the housing of the rear projection television so that the outer peripheral side portion is fitted into the fixed frame.

The lens body of the Fresnel lens used in the transmission screen is made of, for example, an ultraviolet curable resin (UV resin) on one side facing the lenticular lens sheet side of the lens substrate made of, for example, methyl methacrylate / styrene resin (MS resin). The Fresnel lens part is provided and configured so as to be positioned on the exit surface side of the lens body (see, for example, Patent Document 1).
Further, the sheet body of the lenticular lens sheet used for the transmission type screen has a plurality of cylindrical materials made of, for example, ultraviolet curable resin (UV resin) on one side facing the Fresnel lens side of a sheet substrate made of, for example, polyethylene terephthalate resin (PET resin). A diffusing lens portion in which lenses (unit lenses) are arranged is provided so as to be positioned on the incident surface side of the sheet main body.
JP 2002-196422 A

By the way, the Fresnel lens part of the Fresnel lens has a sawtooth shape composed of concavities and convexities arranged concentrically and has a sharp apex. A lenticular lens sheet is disposed opposite to the Fresnel lens portion side of such a Fresnel lens.
Therefore, when a transmissive screen is attached to a fixed frame, if a large load is applied to the Fresnel lens part from the lenticular lens sheet, the sharp apex part of the Fresnel lens part is crushed, so-called tooth crushing occurs. There is a problem that it ends up. If the Fresnel lens portion is crushed, stains observed as being wet on the screen of the rear projection television will be generated, which will be a major problem in video display.

On the other hand, as described in Patent Document 1, it is possible to suppress the above-mentioned crushing by hardening, for example, UV resin that is a material constituting the Fresnel lens portion. In this case, since the restoring property of the UV resin is lowered, the Fresnel lens part is easily damaged, and the moldability of the Fresnel lens part is lowered.
Therefore, conventionally, the transmission type screen is used as a fixed frame in a state where play is provided in the thickness direction of the transmission type screen between the outer peripheral side portion of the transmission type screen and the fixed frame in which the outer peripheral side portion is fitted. I was trying to install it. This is because when the transmissive screen is attached to the fixed frame, if the outer peripheral side portion is firmly tightened in the fixed frame, the load applied to the Fresnel lens part from the lenticular lens sheet increases, and this Fresnel lens part It is based on the natural idea that it will be easy for the teeth to collapse.

Here, the above-mentioned problem of tooth crushing is not so much a problem at room temperature, but becomes particularly noticeable at a high temperature of, for example, 40 ° C. or higher. That is, in a high temperature state, for example, the Fresnel lens portion made of, for example, UV resin becomes softer, and in addition, the lenticular lens sheet having, for example, a sheet substrate made of PET resin is more than the Fresnel lens having, for example, a lens substrate made of MS resin. This is because a larger load is applied to the Fresnel lens portion from the lenticular lens sheet by extending at a large rate.
Therefore, even if the transmissive screen is attached to the fixed frame in a state of having play as in the prior art, the occurrence of stains due to the crushing of the Fresnel lens portion can be suppressed when the temperature becomes high. The current situation was not possible.

  SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has a transmission screen mounting structure and a rear projection display device that can suppress the occurrence of stains effectively by preventing the Fresnel lens portion from being crushed. The purpose is to provide.

In order to solve the above-described problems and achieve such an object, a transmission screen mounting structure according to the present invention is arranged so as to face a Fresnel lens having a Fresnel lens part and the Fresnel lens part side of the Fresnel lens. A transmissive screen having a diffusing lens sheet attached to the fixed frame so that an outer peripheral side portion of the transmissive screen is fitted into the fixed frame, the diffusing lens sheet extending in the surface direction It is characterized by comprising restraining means for restraining the stretching.
The rear projection type display device according to the present invention is characterized by including the transmission screen mounting structure of the present invention.

In the present invention, by providing the restraining means, a high temperature state of, for example, 40 ° C. or higher is reached, and even when the diffusion lens sheet is about to extend at a larger rate than the Fresnel lens, in the surface direction of the diffusion lens sheet. Is restricted. Then, the diffusion lens sheet moves so as to escape away from the Fresnel lens, and the load applied to the Fresnel lens portion from the diffusion lens sheet can be reduced. That is, the present invention makes it possible to reduce the load applied from the diffusing lens sheet to the Fresnel lens portion, and effectively suppress the occurrence of stains, particularly in a high-temperature state where tooth crushing is likely to occur. .
In the case of a transmissive screen equipped with a Fresnel lens and a diffusing lens sheet, the outer peripheral side of the Fresnel lens is used to prevent dust from entering between the Fresnel lens and the diffusing lens sheet or to improve handling. These may be taped so as to wrap around the outer peripheral portion of the diffusion lens sheet, but with this tape fixing, the expansion in the surface direction of the diffusion lens sheet can not be constrained, in the present invention It cannot be a restraining means.

In the present invention, it is preferable that the restraining means is a pressing means that presses the outer peripheral side portion of the transmissive screen in the thickness direction, and the pressing means is the outer peripheral side of the transmissive screen. It is preferable that the spacer is interposed on at least one side of the portion.
At this time, the spacer may be made of an elastic body in a compressed state, or may be made of a shape memory resin.

Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
As shown in FIG. 1, the rear projection television 10 as a rear projection display device according to the first embodiment exposes the casing 11 and the front side (right side in FIG. 1) to the outside of the casing 11. A transmissive screen 20 having a substantially rectangular flat plate shape with the back side (left side in FIG. 1) exposed to the inside of the housing 11, and image light with respect to the back surface of the transmissive screen 20 disposed in the housing 11. And a projector 12 as a light source for projecting light, and, for example, two reflecting mirrors 13 and 14 that are arranged in the housing 11 and deflect the optical path of the image light projected from the projector 12.

As shown in FIG. 2, the transmissive screen 20 has a Fresnel lens 30 having a Fresnel lens portion 33 that adjusts the direction of incident light and outputs the light, and the light emitted from the Fresnel lens 30 in the horizontal direction of the screen (horizontal A lenticular lens sheet (diffusing lens sheet) 40 having a diffusing lens portion 44 that diffuses in the direction), and a diffusion layer 50 that diffuses light emitted from the lenticular lens sheet 40 in the vertical direction (vertical direction) of the screen. Yes.
The Fresnel lens 30, the lenticular lens sheet 40, and the diffusion layer 50 are sequentially arranged from the back side (left side in FIG. 2) to the front side (right side in FIG. 2) of the transmissive screen 20, and are substantially parallel to each other. It is arranged to become.

As shown in FIG. 2, the lens body 31 of the Fresnel lens 30 has a Fresnel lens on one side facing the lenticular lens sheet 40 side (one side facing the front side of the transmission screen 20) in a lens substrate 32 having a substantially rectangular flat plate shape. The portion 33 is provided. The Fresnel lens portion 33 has a sawtooth shape composed of concavities and convexities arranged concentrically and has a sharp apex portion, and is positioned on the exit surface side of the lens body 31.
In the first embodiment, the direction along the normal of the lens body 31 through the center of the concentric circle formed by the concavities and convexities of the lens portion 33, that is, the optical axis P1 of the Fresnel lens 30, as shown in FIG. The lens body 31 is disposed so as to pass through a position outside the lens body 31 outside the long side of the lens body 31 in the direction along the short side of the lens body 31 passing through the center P2 of the lens body 31.

The Fresnel lens 30 configured as described above is provided in the transmissive screen 20 so that the optical axis P1 thereof is positioned on the lower side, for example.
Then, when the image light projected from the projector 12 is incident on the back surface of the transmissive screen 20, that is, when the image light projected from the projector 12 is incident on the Fresnel lens 30 located on the back surface side of the transmissive screen 20, The Fresnel lens 30 adjusts the direction of the incident image light so as to be substantially parallel light, and then emits the light toward the lenticular lens sheet 40.

Here, considering the state in which the optical path of the image light projected from the projector 12 is not deflected by the reflecting mirrors 13 and 14, the projector 12 is disposed on the optical axis P1 of the Fresnel lens 30, so that FIG. As indicated by a two-dot chain line in the middle, the state is arranged in a region deviated downward, for example, from a region facing the rear surface of the transmission screen 20.
Then, the optical path of the image light projected from the projector 12 having such an arrangement is disposed so as to face the back surface of the transmissive screen 20 and to be substantially parallel to the transmissive screen 20. By deflecting by the mirror 14 and another reflecting mirror 13, the projector 12 is disposed in the housing 11 in a region deviated from the region between the transmissive screen 20 and the reflecting mirror 14, for example, downward. ing.

  As shown in FIG. 2, the sheet main body 41 of the lenticular lens sheet 40 has a diffusion lens on one side facing the Fresnel lens 30 side (one side facing the back side of the transmissive screen 20) in a sheet substrate 42 having a substantially rectangular flat plate shape. The light shielding part 45 is provided on one side facing the diffusion layer 50 side of the sheet substrate 42 (one side facing the front side of the transmissive screen 20).

The diffusing lens portion 44 is formed by arranging a plurality of cylindrical lenses (unit lenses) 43 having a substantially semi-cylindrical shape so as to be substantially parallel to each other, and is positioned on the incident surface side of the sheet main body 41.
The plurality of cylindrical lenses 43 constituting the diffusing lens portion 44 have their length directions substantially aligned with the vertical direction (vertical direction) of the screen, and the image light emitted from the Fresnel lens 30 is applied to the lenticular lens sheet 40. When incident, the lenticular lens sheet 40 collects and diffuses the incident video light in the left-right direction (horizontal direction) of the screen to form striped light and then emits it toward the diffusion layer 50. In FIG. 2, for ease of explanation, the length direction of the cylindrical lens 43 is shown to substantially coincide with the horizontal direction (horizontal direction) rather than the vertical direction (vertical direction) of the screen.

The light shielding part (BS = black stripe) 45 is positioned on the exit surface side of the sheet main body 41 so as to shield the stripe-shaped non-condensing part by the plurality of cylindrical lenses 43.
On the other hand, the region corresponding to the stripe-shaped condensing part by the plurality of cylindrical lenses 43 is a passing part 46 positioned on the exit surface side of the sheet main body 41, and the image condensed by the cylindrical lens 43. Light is diffused so as to pass through the passage 46.

The diffusion layer 50 is configured by dispersing and diffusing a diffusing material in a substrate having a substantially rectangular flat plate shape. When image light emitted from the lenticular lens sheet 40 enters the diffusion layer 50, the diffusion layer 50 is formed. 50 diffuses the incident video light in the vertical direction (vertical direction) of the screen and then emits the light toward the front side of the transmissive screen 20.
The diffusion layer 50 is bonded to the exit surface of the sheet body 41 of the lenticular lens sheet 40, and the lenticular lens sheet 40 and the diffusion layer 50 are integrated.

In such a transmissive screen 20, as shown in FIG. 3, the outer peripheral portion of the Fresnel lens 30, the lenticular lens sheet 40, and the diffusion layer in a state where the Fresnel lens 30, the lenticular lens sheet 40, and the diffusion layer 50 are overlaid. These are wrapped with the tape 21 so as to wrap around the outer peripheral portion of the layer 50.
Therefore, the transmissive screen 20 is in a state in which, for example, the tape 21 is wound around the entire peripheral portion of the outer peripheral side portion, and the Fresnel lens 30, the lenticular lens sheet 40, and the diffusion layer 50 are handled integrally. Can do. Note that the tape 21 may be wound around only a part of the outer peripheral side portion of the transmissive screen 20.

  Then, as shown in FIGS. 4A and 4B, the transmissive screen 20 is attached to the fixed frame 15 in the casing 11 of the rear projection television 10 so that its front side (the right side in FIG. 4). Is exposed to the outside of the housing 11 and the back side (left side in FIG. 4) is exposed to the inside of the housing 11.

  In the first embodiment, the fixed frame 15 for attaching the transmission screen 20 has a substantially rectangular opening formed in the front side portion of the housing 11 (an opening for installing the transmission screen 20). And a jig 13 attached to the housing 11 by, for example, screwing from the inner side of the housing 11 so as to be opposed to the back side of each side portion of the peripheral portion 12. Has been. Note that the jig 13 may be disposed to face the entire peripheral portion of the peripheral portion 12, or the jig 13 may be disposed to face only a part of the peripheral portion 12. .

The transmissive screen 20 is attached to the fixed frame 15 such that the outer peripheral side portion thereof, that is, the outer peripheral side portion in which the tape 21 is wound is fitted into the fixed frame 15.
Further, when the transmissive screen 20 is attached to the fixed frame 15, as shown in FIG. 4B, between the jig 13 and the one surface where the Fresnel lens 30 is positioned in the outer peripheral side portion of the transmissive screen 20. A spacer 60 made of an elastic material such as sponge or rubber is interposed so as to exist, for example, over the entire circumference of the outer peripheral side portion of the transmission screen 20. In addition, the spacer 60 may be interposed so as to exist over only a part of the outer peripheral side portion of the transmission screen 20.

Here, as shown in FIG. 4B, when the jig 13 is attached after setting the transmissive screen 20 at a predetermined position with respect to the fixed frame 15 from the inside of the housing 11, the spacer 60 made of an elastic body. However, it is in a compressed state between one side of the transmissive screen 20 where the Fresnel lens 30 is located and the jig 13.
Therefore, the elastic spacer 60 which is compressed when the transmission screen 20 is attached to the fixed frame 15 firmly presses the outer peripheral side portion of the transmission screen 20 in the thickness direction. The outer peripheral side portion 20 is firmly tightened in the thickness direction within the fixed frame 15. That is, the spacer 60 in the compressed state serves as a pressing unit that presses the outer peripheral side portion of the transmission screen 20 in the thickness direction, and this pressing unit restrains the lenticular lens sheet 40 in the transmission screen 20 from extending in the surface direction. It is a restraining means to do.

Also in the first embodiment as described above, as in the conventional case, when the temperature becomes higher than 40 ° C., for example, due to the difference between the material constituting the lens substrate 32 and the material constituting the sheet substrate 42. The lenticular lens sheet 40 tends to extend at a larger rate than the Fresnel lens 30.
However, as described above, the outer peripheral side portion of the transmission screen 20 is firmly clamped in the fixed frame 15 by the compressed spacer 60 as the restraining means and the pressing means, so that the surface of the lenticular lens sheet 40 is Elongation in the direction is reliably restrained.

Then, the lenticular lens sheet 40 in which the expansion in the surface direction is constrained despite the fact that it is extending in the surface direction moves so as to escape to the front surface side opposite to the Fresnel lens 30. The load applied from the lenticular lens sheet 40 to the Fresnel lens portion 33 having a sharp apex portion can be reduced.
That is, in the first embodiment, the transmission screen 20 is attached to the fixed frame 15 in a state where the outer peripheral side portion is firmly tightened without having any play, based on a completely different concept from the conventional one, so that the tooth It is possible to reduce the load applied from the lenticular lens sheet 40 to the Fresnel lens portion 33 in a high temperature state in which crushing is likely to occur, and to effectively suppress the occurrence of stains.

Next, a second embodiment of the present invention will be described with reference to FIG. 5 attached, but the same parts as those in the first embodiment described above are denoted by the same reference numerals and the description thereof is omitted.
As shown in FIGS. 5A and 5B, in the second embodiment, the fixed frame 15 for attaching the transmission screen 20 is a substantially rectangular opening formed in the front side portion of the housing 11. A substantially rectangular peripheral portion 12 that surrounds the portion (opening for installing the transmission type screen 20) and the front side of each side portion of the peripheral portion 12 are opposed to each other, and for example, a screw is provided from the outside of the housing 11 It is comprised by the jig | tool 13 attached to the housing | casing 11 by a stop. Note that the jig 13 may be disposed to face the entire peripheral portion of the peripheral portion 12, or the jig 13 may be disposed to face only a part of the peripheral portion 12. .

The transmissive screen 20 is attached to the fixed frame 15 such that the outer peripheral side portion thereof, that is, the outer peripheral side portion in which the tape 21 is wound is fitted into the fixed frame 15.
Further, when the transmissive screen 20 is attached to the fixed frame 15, as shown in FIG. 5B, between the one side where the Fresnel lens 30 is located on the outer peripheral side portion of the transmissive screen 20 and the peripheral portion 12. A spacer 60 made of an elastic material such as sponge or rubber is interposed so as to exist, for example, over the entire circumference of the outer peripheral side portion of the transmission screen 20. In addition, the spacer 60 may be interposed so as to exist over only a part of the outer peripheral side portion of the transmission screen 20.

Here, as shown in FIG. 5B, when the jig 13 is attached after the transmissive screen 20 is set at a predetermined position with respect to the fixed frame 15 from the outside of the housing 11, the spacer 60 made of an elastic body. However, it is in a compressed state between one side of the transmissive screen 20 where the Fresnel lens 30 is located and the peripheral portion 12.
Therefore, the elastic spacer 60 which is compressed when the transmission screen 20 is attached to the fixed frame 15 firmly presses the outer peripheral side portion of the transmission screen 20 in the thickness direction. The outer peripheral side portion 20 is firmly tightened in the thickness direction within the fixed frame 15. That is, the spacer 60 in the compressed state serves as a pressing unit that presses the outer peripheral side portion of the transmissive screen 20 in the thickness direction, and the pressing unit extends the lenticular lens sheet 40 in the surface direction of the transmissive screen 20. It is a restraining means for restraining.
Also in the second embodiment, the same effect as that of the first embodiment described above can be obtained.

  In each of the embodiments described above, there is a gap (each between the end of the outer peripheral side portion of the transmission screen 20 and the fixed frame 15 as shown in FIGS. 4B and 5B. There may be a transmissive screen 20 in the drawing, a space portion above the tape 21), or an end portion of the outer peripheral side portion of the transmissive screen 20 is interposed via the tape 21 (the tape 21 is not wound). It can also be brought into contact with the fixed frame 15 (without a tape at the part). By bringing both members into contact with each other in this manner, the lenticular lens sheet 40 and the diffusion layer 50 are further restrained from extending in the surface direction.

Moreover, in each embodiment, although the spacer 60 which is an elastic body of a compression state is used as the said restraining means and pressing means, it is not limited to this, The spacer 60 which is shape memory resin is used. Also good.
That is, for example, in the high temperature state where tooth crushing is likely to occur by using the shape memory resin designed to cause volume expansion when the high temperature state is, for example, 40 ° C. or more, the shape memory is easily generated. The spacer 60 made of resin firmly presses the outer peripheral side portion of the transmissive screen 20 in the thickness direction, and the outer peripheral side portion of the transmissive screen 20 is firmly tightened in the thickness direction within the fixed frame 15. As the shape memory resin, known materials such as polyester, polyurethane, styrene butadiene, polynorbornene, and trans polyisoprene can be used.
In such a case, in addition to obtaining the same effects as the above-described embodiments, the spacer 60 does not necessarily need to be compressed when the transmission screen 20 is attached to the fixed frame 15. The operation of attaching the transmission screen 20 to the fixed frame 15 can be easily performed.

  Further, in each embodiment, when the transmission screen 20 is attached to the fixed frame 15, one side of the outer peripheral side portion of the transmission screen 20 where the Fresnel lens 30 is located (in the first embodiment, the transmission screen). In the second embodiment, between the one surface where the Fresnel lens 30 is positioned and the peripheral portion 12 in the outer peripheral side portion of the transmission screen 20. However, the present invention is not limited to this.

For example, when the transmissive screen 20 is attached to the fixed frame 15, one side of the outer peripheral side portion of the transmissive screen 20 where the lenticular lens sheet 40 (and the diffusion layer 50) is located (in the first embodiment, the transmissive type). In the second embodiment, between the one side where the lenticular lens sheet 40 (and the diffusion layer 50) is located in the outer peripheral side portion of the screen 20 and the peripheral portion 12, in the second embodiment, the lenticular lens sheet 40 (and more in the outer peripheral side portion of the transmissive screen 20). A spacer 60 may be interposed between the one side where the diffusion layer 50) is located and the jig 13).
Further, for example, when the transmissive screen 20 is attached to the fixed frame 15, the single-sided side where the Fresnel lens 30 is located and the lenticular lens sheet 40 (and the diffusion layer 50) are positioned in the outer peripheral side portion of the transmissive screen 20. The spacer 60 may be interposed on both sides.

  In each embodiment, a plurality of cylindrical lenses (unit lenses) 43 are arranged substantially in parallel as a diffusing lens sheet in which the transmissive screen 20 diffuses light emitted from the Fresnel lens 30 in the horizontal direction of the screen. The lenticular lens sheet 40 having the diffusing lens portion 44 is provided, and the diffusing layer 50 is provided as diffusing means for diffusing the light emitted from the Fresnel lens 30 in the vertical direction of the screen. It is not limited to a lens sheet.

  For example, the transmissive screen 20 has a plurality of unit lenses arranged in a matrix as a diffusion lens sheet that diffuses light emitted from the Fresnel lens 30 in the horizontal direction (horizontal direction) and the vertical direction (vertical direction) of the screen. You may make it provide the micro lens sheet | seat which has the diffusion lens part which becomes. Further, for example, a plurality of cylindrical lenses (unit lenses) are used as a diffusing lens sheet in which the transmissive screen 20 diffuses light emitted from the Fresnel lens 30 in the horizontal direction (horizontal direction) and the vertical direction (vertical direction) of the screen. The first lens array arranged substantially in parallel and the second lens array in which a plurality of cylindrical lenses (unit lenses) are arranged substantially in parallel have the same plane so that the length directions of the cylindrical lenses intersect each other. You may make it provide the cross wrench lens sheet | seat which has the diffused lens part arrange | positioned on the top. Even in these cases, the transmissive screen 20 may include the diffusion layer 50 as necessary.

  Further, for example, a plurality of unit lenses that reflect and diffuse image light are arranged as a diffusing lens sheet in which the transmissive screen 20 diffuses light emitted from the Fresnel lens 30 in the left-right direction (horizontal direction) of the screen. A diffusing layer 50 may be provided as diffusing means for diffusing light emitted from the Fresnel lens 30 in the vertical direction (vertical direction) of the screen. Note that the diffusion layer 50 is not necessarily required depending on the shape and arrangement of the plurality of unit lenses in the prism lens sheet.

It is a schematic sectional drawing which shows an example of the rear projection television by 1st Embodiment of this invention. It is a schematic sectional drawing which shows an example of the transmissive screen by 1st Embodiment of this invention. (A) is a schematic plan view which shows an example of the transmissive screen by 1st Embodiment of this invention, (b) is XX sectional drawing in (a). It is a schematic sectional drawing which shows an example of the attachment structure of the transmission type screen by 1st Embodiment of this invention. It is a schematic sectional drawing which shows an example of the attachment structure of the transmission type screen by 2nd Embodiment of this invention.

Explanation of symbols

10 Rear projection television (rear projection display device)
12 Projector (light source)
20 transmissive screen 30 Fresnel lens 31 lens body 32 lens substrate 33 Fresnel lens part 40 lenticular lens sheet (diffuse lens sheet)
41 Sheet body 42 Sheet substrate 43 Cylindrical lens (unit lens)
44 Diffusing lens part 45 Light shielding part 50 Diffusion layer

Claims (6)

A transmissive screen comprising a Fresnel lens having a Fresnel lens part and a diffusing lens sheet disposed opposite to the Fresnel lens part side of the Fresnel lens so that the outer peripheral side part is fitted in a fixed frame, A mounting structure for mounting on a fixed frame,
A transmissive screen mounting structure comprising a restraining means for restraining the diffusion lens sheet from extending in the surface direction. The transmission screen mounting structure according to claim 1,
The attachment structure for a transmission screen, wherein the restraining means is a pressing means for pressing the outer peripheral side portion of the transmission screen in the thickness direction. The transmission screen mounting structure according to claim 2,
The transmissive screen mounting structure, wherein the pressing means is a spacer interposed on at least one side of the outer peripheral side portion of the transmissive screen. A transmission screen mounting structure according to claim 3,
The transmissive screen mounting structure is characterized in that the spacer is made of an elastic body in a compressed state. The transmissive screen mounting structure according to claim 3,
The transmissive screen mounting structure is characterized in that the spacer is made of a shape memory resin. A rear projection display device comprising the transmissive screen mounting structure according to any one of claims 1 to 5.

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