JP4797460B2 - Projection display - Google Patents

Description

  The present invention relates to a projection display device.

  As a conventional projection display device, there is one described in Japanese Patent Application Laid-Open No. 2002-372749 (see the following publication).

  This projection display device has the following functions.

  The light source light is color-separated into R light, G light, and B light, and each color light is incident on a wire grid polarization beam splitter (hereinafter referred to as a wire grid) disposed at a predetermined position to separate the light. One of the emitted polarized light is incident on a reflection type light valve arranged for each color light, is modulated by a color signal of each color light, reflected and emitted, and the modulated light is detected and extracted by the wire grid, The color detection light of each color is synthesized and projected by a projection lens. A wire grid refers to a metal grid formed on a glass substrate with a minute interval.

The wire grid is usually fixed to the mounting member using an epoxy-based or silicon-based adhesive.
JP 2002-372749 A

  By the way, since the attachment member to which the wire grid is fixed is made of metal, the linear expansion coefficients of the attachment member and the wire grid are different.

  Therefore, when the wire grid is irradiated with light and the wire grid is thermally expanded or when the temperature around the wire grid is changed, the following phenomenon occurs due to the difference in coefficient of linear expansion between the mounting member and the wire grid. There was a problem.

 When an epoxy adhesive is used, the wire grid is deformed (bent, bent, etc.). Further, when a silicon-based adhesive is used, the incident surface of the wire grid is displaced in a direction away from the mounting member. As a result, pixel shift occurs in the projected image.

  The present invention has been made in view of such circumstances, and an object thereof is to provide a projection display device capable of suppressing pixel shift of a projection image caused by thermal expansion of a wire grid.

In order to solve the above-mentioned problem, the invention according to claim 1 is a mounting member for mounting the wire grid polarization beam splitter, a first protrusion disposed so as to contact the first side surface of the wire grid polarization beam splitter, A first restricting member configured by a second protrusion disposed on a second side opposite to the first side through a gap; and a first perpendicular to the first side of the wire grid polarization beam splitter. A second restricting member composed of a third protrusion disposed so as to contact the side surface of the third surface, and a fourth protrusion disposed through a gap on the fourth side surface facing the third side surface; The wire grid polarization beam splitter is disposed on the attachment member, and a fixing portion that fixes the intersection of the first side surface and the third side surface of the wire grid polarization beam splitter and the attachment member. It is comprised with the 3rd control member which controls the deformation | transformation to the thickness direction of this.

  According to a second aspect of the present invention, in the projection display device according to the first aspect, the third restricting member is formed integrally with at least one of the first and second protrusions, and the wire grid is arranged in the thickness direction. A first spring that presses the wire grid and a second spring that is formed integrally with at least one of the third and fourth protrusions and presses the wire grid in the thickness direction thereof.

  According to the present invention, it is possible to suppress the pixel shift of the projected image due to the thermal expansion of the wire grid.

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

  FIG. 1 is a diagram showing a basic configuration of a projection display apparatus according to the first embodiment of the present invention.

  The light source light emitted from the light source 1 composed of the lamp 1a and the concave mirror 1b such as a parabolic mirror is such that the B (blue) light reflecting dichroic mirror 2B and the dichroic mirror 2RG reflecting R light and G light are orthogonal to each other. The light is incident on a cross dichroic mirror 2 arranged in an X shape and is separated into B light traveling in opposite directions and mixed light of R light and G light.

  The B light travels with the bending mirror 3 changing its traveling direction, and enters the B light wire grid polarization beam splitter 6B (hereinafter referred to as the wire grid 6B). The mixed light of the R light and the G light is changed in the traveling direction by the bending mirror 4 and is incident on the G light reflecting dichroic mirror 5, and is separated into R light that is transmitted and G light that is reflected. Are incident on a wire grid polarization beam splitter 6R for R light (hereinafter referred to as wire grid 6R) and a wire grid polarization beam splitter 6G for G light (hereinafter referred to as wire grid 6G) 6G.

  In the wire grids 6B, 6R, and 6G, a metal (aluminum) is formed in a lattice shape on a rectangular glass substrate. The wire grids 6B, 6R, and 6G reflect light polarized in a direction parallel to the lattice arrangement direction and transmit light polarized in a direction perpendicular to the lattice arrangement direction.

  The polarized light transmitted through the wire grids 6B, 6R, and 6G is incident on the reflective light valves 7B, 7R, and 7G for the respective color lights. The light incident on the reflection type light valves 7B, 7R, and 7G is modulated and reflected by the color signals of the respective colors, is incident on the wire grids 6B, 6R, and 6G again, and is polarized into the reflected modulated light and the transmitted unmodulated light. To be separated. Only the modulated light reflected by the wire grids 6B, 6R, and 6G is extracted (detected) and is incident on different incident surfaces of the cross dichroic prism 9 that performs color composition of the detected light of each color light.

  The B light incident on the cross dichroic prism 9 is reflected by the B light reflecting dichroic film 9B, the R light is reflected by the R light reflecting dichroic film 9R, and the G light is transmitted through both the films 9B and 9R, and is synthesized and emitted. Ejected from the face. The combined light enters the projection lens 11, and a full color image is enlarged and projected on a screen (not shown).

  The wire grids 6B, 6R, and 6G are supported on the outer surface 202a (302a) of the mounting member 302 (202) that houses the cross dichroic prism 9 (see FIGS. 2 and 3).

  A method of supporting the wire grids 6B, 6R, 6G on the outer surface 202a (302a) of the attachment member 302 (202) will be described with reference to FIGS. In addition, since each support method of wire grid 6B, 6R, 6G is the same, only the support method of wire grid 6B for G light is demonstrated below.

  FIG. 2 is a perspective view showing a part of the projection type display apparatus according to the first embodiment of the present invention and showing a state in which the wire grid is supported by the mounting member 302.

  The wire grid 6B has a predetermined position (attachment) on the outer surface 302a of the attachment member 302 by a leaf spring 303 (third restriction member (regulation member)), a first protrusion 304, a second protrusion 305, a third protrusion 306, and a fourth protrusion 307. The member 302 is supported at a position facing an opening (not shown) of the member 302. The first protrusion 304 and the second protrusion 305 constitute a first restricting member, and the third protrusion 306 and the fourth protrusion 307 constitute a second restricting member. The rotation restricting member of claim 1 is constituted by the first restricting member and the second restricting member.

  The leaf spring 303 has a rectangular frame portion 303a in which an opening facing the wire grid 6B is formed, and an attachment portion 303b formed by bending a left and right part of the frame portion 303a into a crank shape. The attachment portion 303 b is attached to the outer surface 302 a of the attachment member 302 with a screw 309.

  The wire grid 6B is sandwiched between the frame portion 303a and the outer surface 302a of the attachment member 302, and is pressed against the outer surface 302a by the spring force of the frame portion 303a. In other words, the deformation in the thickness direction T of the surface 6Be of the wire grid 6B is regulated by the leaf spring 303.

  The first protrusion 304 is a cylinder that stands upright on the outer surface 302 a of the attachment member 302. The first protrusion 304 is in contact with one vertical surface (first side surface) 6Ba of the wire grid 6B.

  The second protrusion 305 is a cylinder that stands upright on the outer surface 302 a of the mounting member 302. The second protrusion 305 is disposed on the other vertical surface (second side surface) 6Bb of the wire grid 6B via a gap.

  The first protrusion 304 and the second protrusion 305 restrict movement of a predetermined amount or more in the horizontal direction H orthogonal to the thickness direction T of the vertical surface 6Bb of the wire grid 6B (displacement of the vertical surface 6Bb in the horizontal direction H). Has been. Here, the predetermined amount refers to the maximum moving distance due to thermal expansion.

  The third protrusion 306 is a cylinder upright on the outer surface 302a of the mounting member. The third protrusion 306 contacts one horizontal surface (third side surface) 6Bc of the wire grid 6B.

  The fourth protrusion 307 is a cylinder that stands upright on the outer surface 302 a of the mounting member 302. The fourth protrusion 307 is disposed on the other horizontal surface (fourth side surface) 6Bd of the wire grid 6B via a gap.

  The third protrusion 306 and the fourth protrusion 307 restrict movement of the wire grid 6B by a predetermined amount or more in the vertical direction V perpendicular to the thickness direction T of the horizontal plane 6Bd (displacement of the horizontal plane 6Bd in the vertical direction V). Yes.

  Note that the lower right corner of the four corners of the wire grid 6B is fixed to the outer surface 302a of the mounting member 302 with an adhesive am.

  Since the wire grid 6B is supported on the outer surface 302a of the mounting member 302 by the above method, when the wire grid 6B is thermally expanded by irradiating light to the wire grid 6B, the wire grid 6B is orthogonal to the thickness direction T of the wire grid 6B. The vertical plane 6Bb of the wire grid 6B moves in the horizontal direction H, and the horizontal plane 6Bd of the wire grid 6B moves in the vertical direction V orthogonal to the thickness direction T of the wire grid 6B.

  However, since the second protrusion 305 is disposed on the vertical surface 6Bb of the wire grid 6B via the gap as described above, the movement of the vertical surface 6Bb of the wire grid 6B by a predetermined amount or more is limited by the second protrusion 305. The In addition, since the fourth protrusion 307 is disposed on the horizontal plane 6Bd of the wire grid 6B with a gap as described above, the movement of the horizontal plane 6Bd of the wire grid 6B by a predetermined amount or more is limited by the fourth protrusion 307.

  Note that the displacement of the incident surface 6Be of the wire grid 6B in the direction away from the outer surface 302a of the mounting member 302 is prevented by the spring force of the leaf spring 303.

  According to the first embodiment, since the wire grids 6B, 6R, and 6G are not deformed / displaced in the optical axis direction, pixel deviation of the projected image due to thermal expansion can be suppressed. Further, it is possible to prevent the occurrence of color unevenness in the projected image due to the deformation of the wire grids 6B, 6R, 6G.

  FIG. 3 is a perspective view showing a part of a projection type display apparatus according to the second embodiment of the present invention and showing a state in which a wire grid is supported by an attachment member. Portions common to the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  The wire grid 6B is supported at a predetermined position on the outer surface 202a of the mounting member 202 by the first protrusions 204A, 204B, the second protrusion 205B, the third protrusion 206, the fourth protrusion 207, the springs 204Ba, 205Ba, and the spring 207a.

  The first protrusions 204A and 204B and the second protrusion 205B constitute a first restricting member. The third protrusion 206 and the fourth protrusion 207 constitute a second restricting member. The rotation restricting member of claim 1 is constituted by the first restricting member and the second restricting member.

  The first protrusions 204A and 204B are in contact with one vertical surface (first side surface) 6Ba of the wire grid 6B. The first protrusions 204A and 204B are provided on the outer surface 202a of the mounting member 202 at a predetermined interval in the vertical direction V. The first protrusion 204 </ b> A is a protrusion formed by cutting and raising a part of the attachment member 202. The first protrusion 204B is a plate bent into an L shape. The protrusion 204 </ b> B is attached to the outer surface 202 a of the attachment member 202 with a screw 209. A corrugated first spring 204Ba is integrally formed with the first protrusion 204B. The first spring 204Ba presses the wire grid 6B in the thickness direction T.

  The second protrusion 205B is disposed on the other vertical surface (second side surface) 6Bb of the wire grid 6B via a gap. The second protrusion 205B is a plate bent into an L shape. The second protrusion 205 </ b> B is attached to the outer surface 202 a of the attachment member 202 with a screw 209. A corrugated first spring 205Ba is formed integrally with the second protrusion 205B. The first spring 205Ba presses the wire grid 6B in the thickness direction T.

  The first protrusions 204A and 204B and the second protrusions 205B restrict the extension of the wire grid 6B supported on the outer surface 202a of the mounting member 202 by a predetermined amount or more in the horizontal direction H perpendicular to the thickness direction T.

  The third protrusion 206 is in contact with one horizontal surface (third side surface) 6Bc of the wire grid 6B. The third protrusion 206 is a protrusion formed by cutting and raising the attachment member 202.

  The fourth protrusion 207 is disposed on the other horizontal surface (fourth side surface) 6Bd of the wire grid 6B with a gap. The fourth protrusion 207 is a plate bent into an L shape. The fourth protrusion 207 is attached to the outer surface 202 a of the attachment member 202 with a screw 209. A corrugated second spring 207 a is formed integrally with the fourth protrusion 207. The second spring 207a presses the wire grid 6B in the thickness direction T.

  The third protrusion 206 and the fourth protrusion 207 restrict movement of a predetermined amount or more in the vertical direction V perpendicular to the thickness direction T of the wire grid 6B.

  The first springs 204Ba and 205Ba and the second spring 207a constitute a third restriction member (regulation member).

  The lower right part of the four corners of the wire grid 6B is fixed to the outer surface 202a of the mounting member 202 with an adhesive am.

  Since the wire grid 6B is supported on the outer surface 202a of the mounting member 202 by the above method, when the wire grid 6B is thermally expanded by irradiating light to the wire grid 6B, the wire grid 6B is orthogonal to the thickness direction T of the wire grid 6B. The vertical plane 6Bb of the wire grid 6B moves in the horizontal direction H, and the horizontal plane 6Bd of the wire grid 6B moves in the vertical direction V orthogonal to the thickness direction T of the wire grid 6B.

  However, since the protrusion 205B is disposed on the vertical surface 6Bb of the wire grid 6B with a gap as described above, the movement of the vertical surface 6Bb of the wire grid 6B by a predetermined amount or more is limited by the second protrusion 205B. Further, as described above, since the fourth protrusion 207 is disposed on the horizontal plane 6Bd of the wire grid 6B via a gap, the movement of the horizontal plane 6Bd of the wire grid 6B by a predetermined amount or more is limited by the fourth protrusion 207.

  Note that the displacement of the incident surface 6Be of the wire grid 6B in the direction away from the outer surface 202a of the mounting member 202 is prevented by the spring force of the first springs 204Ba and 205Ba and the second spring 207a.

  According to this embodiment, the same effects as those of the first embodiment can be obtained.

  In the first and second embodiments, protrusions 304, 305, 306, and 307 (204A) that limit extension in a horizontal direction H and a vertical direction V that are orthogonal to the thickness direction of the wire grid 6B by a predetermined amount or more. , 204B, 205B, 206, 207), the protrusions 304 are respectively in contact with one side surface (vertical surface 6Ba) in the horizontal direction H of the wire grid 6B and one side surface (horizontal surface 6Bc) in the vertical direction V. (204A, 204B), 306 (206) may be provided. Thereby, rotation in the plane perpendicular to the thickness direction of the wire grid 6B can be prevented, and a reduction in contrast can be prevented.

FIG. 1 is a diagram showing a basic configuration of a projection display apparatus according to the first embodiment of the present invention. FIG. 2 is a perspective view showing a part of the projection type display device according to the first embodiment of the present invention and showing a state in which the wire grid is supported by the mounting member. FIG. 3 is a perspective view showing a part of a projection type display apparatus according to the second embodiment of the present invention and showing a state in which a wire grid is supported by an attachment member.

Explanation of symbols

  6B, 6R, 6G: wire grid, 6Ba: one vertical surface (first side surface), 6Bb: the other vertical surface (second side surface), 6Bc: one horizontal surface (third side surface), 6Bd: other Horizontal plane (fourth side surface), 202, 302: mounting member, 202a, 302a: outer surface, 204A, 204B, 304: first protrusion, 204Ba, 205Ba: first spring, 207a: second spring, 205B, 305: Second projection, 206, 306: Third projection, 207, 307: Fourth projection, 303: Leaf spring (third regulating member (regulating member)), T: Thickness direction, H: Horizontal direction, V: Vertical direction .

Claims (2)

A mounting member for mounting the wire grid polarization beam splitter;
A first projection disposed so as to contact the first side surface of the wire grid polarization beam splitter, and a second projection disposed via a gap on the second side surface opposed to the first side surface. A first restricting member,
A third protrusion disposed to abut on a third side surface perpendicular to the first side surface of the wire grid polarization beam splitter, and a fourth side surface opposed to the third side surface with a gap therebetween A second restricting member constituted by the fourth protrusion made,
A fixing portion that fixes the intersection of the first side surface and the third side surface of the wire grid polarization beam splitter and the mounting member;
A projection type display device comprising: a third regulating member which is disposed on the mounting member and regulates deformation of the wire grid polarization beam splitter in the thickness direction . The third restricting member is formed integrally with at least one of the first and second protrusions, and is attached to at least one of the first spring that presses the wire grid in the thickness direction and the third and fourth protrusions. The projection type display device according to claim 1, wherein the projection type display device is formed integrally with a second spring that presses the wire grid in a thickness direction thereof .

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