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Back projection-type screen and back projection-type projection device

A rear projection and screen technology, which is applied to projection devices, projectors with built-in screens/external screens, optics, etc., can solve the problems of not being able to provide good images, not being able to provide images, etc.

Inactive Publication Date: 2007-06-27
KURARAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] Also, since there is a problem of moiré fringes due to the relationship between the pitch ratio of the lenticular lens and the Fresnel lens, good images cannot be provided if the corresponding values ​​are not within a specific range.
In particular, when the lenticular lenses are composed of vertical stripes and horizontal stripes, as shown in FIG. Lines 103 are made by aligning the intersection points of the lattices formed by the vertical and horizontal strips 101, 102 and juxtaposed. The pitch P of the lines interferes with the pitch Pf of the Fresnel lenses to generate moiré fringes. resolved, it does not provide a good image

Method used

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  • Back projection-type screen and back projection-type projection device

Examples

Experimental program
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Effect test

Embodiment approach 2

[0116] 4 is a perspective view showing the configuration of main parts of a lenticular lens sheet according to Embodiment 2 of the present invention. Below, as far as the lenticular lens sheet is concerned, the structure that does not include the self-adjusting outer light-absorbing layer 17 is a lenticular lens sheet A (marker 10 among the figures), and the self-adjusting lens sheet A is set in the lenticular lens sheet A. The sheet of the external light absorbing layer 17 is a biconvex lens sheet B (reference number 11 in the figure).

[0117] The lenticular lens sheet A is an integral lenticular lens sheet formed by the first lens layer 14 and the second lens layer 15, the first lens layer 14 and the second lens layer 15 take the second lens row 13 as a boundary surface, The refractive indices are different from each other. In Embodiment 2 of the present invention, the refractive index of the first lens layer 14 is configured to be smaller than the refractive index of the ...

Embodiment approach 3

[0172] 6 is a perspective view showing the configuration of main parts of a lenticular lens sheet according to Embodiment 3 of the present invention.

[0173] In the lenticular lens sheet A, a transparent support 21 is provided on the emission side of the second lens layer 15 . In addition, it is different from the configuration shown in Embodiment 2 of the invention in that a self-regulating external light absorbing layer 17 is provided on the surface of the transparent support 21 on the emission side. The other configurations are the same as those in Embodiment 2 of the invention, and thus, descriptions thereof are omitted.

[0174] The transparent support 21 is made of acrylic resin, MS resin, or PET film.

[0175] In the lenticular lens sheet according to Embodiment 3 of the present invention, a self-regulating external light absorbing layer 17 is formed on the exit surface side of the transparent support body 21 having the first lens row 12 and the second lens row 13 per...

Embodiment approach 4

[0185] Fig. 7 is a perspective view showing the configuration of main parts of a lenticular lens sheet according to Embodiment 4 of the present invention. In addition, in Embodiment 4, the lenticular lens sheet part formed by the first lens layer 14 and the second lens layer 15 is a lenticular lens sheet A (reference number 10 in the figure), and has a filled layer therein. 16 and the lenticular lens sheet of the self-adjusting type external light absorbing layer 17 are lenticular lens sheet B (marker 11 among the figures). In the lenticular lens sheet A, the first lens array 12 is provided on the incident surface, and the second lens array 13 is provided on the outgoing surface so as to be substantially perpendicular to the first lens array 12 . In addition, in Embodiment 4 of the present invention, a combination is formed in which the refractive index of the lens layers constituting the lenticular lens sheet A is higher than the refractive index of the filling layer 16 descr...

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Abstract

A back projection-type screen and a back projection-type projection device, in which contrast is enhanced, unevenness of an external light absorption layer is reduced, moire trouble is suppressed, damage due to contact between sheets is suppressed, and the entire projection device can be reduced in size and weight. The back projection-type screen is the so-called oblique projection system where the optical center of a Fresnel lens sheet (7) is located at a position outside a display screen area, above or blow the screen. The lens array (12) of a lenticular lens sheet (1) is arranged substantially in the vertical direction. Moire can be reduced by setting the pitch of Fresnel lens and the lens pitch of the lenticular lens sheet within a predetermined range.

Description

technical field [0001] The present invention relates to a rear projection screen and a rear projection projection device using the rear projection screen. Background technique [0002] A rear projection screen used in a rear projection projection device or the like generally has a structure in which two lens sheets are superimposed. A Fresnel lens sheet is arranged on the light source side, which focuses the image light from a rear projection type projection device within a certain angle range, and a diffuser sheet is arranged on the observer side, which has functions that will be realized in the Fresnel lens sheet The transmitted image light is a function of expanding the range of suitable angles. A lenticular lens sheet or an optical sheet as disclosed in Patent Document 1 is generally used as the diffusion sheet. In addition, as long as there is no contradiction in the content, the lenticular lens sheet for a rear projection type screen of the present invention has a di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03B21/62G02B3/00G03B21/10G02B3/08
CPCG03B21/625G02B3/0068
Inventor 小野阳二
Owner KURARAY CO LTD
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