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Projector

A projector and polarization conversion technology, applied in the field of projectors, can solve the problem of uneven lighting and achieve the effect of reducing uneven lighting

Active Publication Date: 2013-03-27
SEIKO EPSON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, the inventors of the present invention have found that, in the above-mentioned projectors that do not include the integrating optical system, there is a problem that uneven illumination occurs in the projected image projected on the screen.

Method used

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Experimental program
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Effect test

Embodiment approach 1

[0064] figure 1 It is a diagram for explaining the projector 1000 according to the first embodiment. figure 1 (a) is a plan view showing the optical system of the projector 1000, figure 1 (b) is a side view showing the optical system of the projector 1000 . also, figure 1 In , the arrows shown from the white light emitting diode 20 to the liquid crystal light modulation device 200 schematically illustrate the light flow. In addition, in figure 1 Illustration of the loop mirror body is omitted in (b). in the later figure 2 The same is true for (b).

[0065] In addition, in the drawings illustrating the optical system and / or each optical element, three directions perpendicular to each other are respectively referred to as z-axis directions ( figure 1 The optical axis (illumination optical axis) of the lighting device 100 in (a) 100ax direction), the x-axis direction ( figure 1 The direction parallel to the paper surface and perpendicular to the z-axis in (a)) and the y-...

Embodiment approach 2

[0095] Figure 4 It is a diagram for explaining the lighting device 102 in the second embodiment.

[0096] Projector 1002 (not shown) according to Embodiment 2 basically has the same configuration as projector 1000 according to Embodiment 1, but differs from projector 1000 according to Embodiment 1 in the configuration of the light diffusion mechanism. light diffusing mechanism 70, such as Figure 4 As shown, there are a plurality of light diffusing parts 72 . The light diffusing part 72 in this embodiment differs from the light diffusing part 52 in Embodiment 1 in cross-sectional shape. That is, one of the plurality of light-diffusing portions 72 has a triangular cross-sectional shape when viewed in a cross-section perpendicular to the direction in which one of the light-diffusing portions extends.

[0097] In this way, according to the projector 1002 according to the second embodiment, since the projector 1000 according to the first embodiment includes the light diffusion...

Embodiment approach 3

[0101] Figure 5 It is a diagram for explaining the lighting device 104 in the third embodiment.

[0102] Projector 1004 (not shown) according to Embodiment 3 basically has the same configuration as projector 1000 according to Embodiment 1, but differs from projector 1000 according to Embodiment 1 in the configuration of the light diffusion mechanism. That is, the light diffusion mechanism 80, such as Figure 5 As shown, a plurality of light diffusing portions 82 are provided on the surface of the light diffusing mechanism 80 on the light source device 10 side and the surface of the light diffusing mechanism 80 on the light modulation device 200 side. One of the plurality of light-diffusing portions 82 has a triangular cross-sectional shape when viewed in a cross-section perpendicular to the direction in which one of the light-diffusing portions extends.

[0103] In this way, according to the projector 1004 according to the third embodiment, as in the projector 1000 accordin...

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Abstract

The invention provides a projector capable of reducing illumination non-uniformity generated on a projection image projected on a screen. The projector (100) includes an illumination device (100) having a light source device (10) emitting light, and a polarization conversion element (40) adapted to emit light from the light source device (10) as polarized light, a light modulation device (400) adapted to modulate the light from the illumination device (100) in accordance with image information, and a projection optical system (600) adapted to project the light from the light modulation device (400), and the illumination device (100) further includes a light diffusing unit (50) disposed in at least one of upstream and downstream of the polarization conversion element (40).

Description

technical field [0001] The present invention relates to projectors. Background technique [0002] Conventionally, there is known a projector that includes: an illumination device including a light source device that emits light and a polarization conversion element that emits light from the light source device as polarized light; and a reflective light modulation device based on Image information modulates light from an illumination device; and a projection optical system that projects light from a light modulation device (for example, refer to Patent Document 1). According to a conventional projector, an image corresponding to image information can be projected using light from a lighting device. [0003] prior art literature [0004] patent documents [0005] Patent Document 1: Japanese Unexamined Patent Publication No. 2010-91927 [0006] However, in recent years, there has been a demand for an extremely small projector (so-called pico projector) that is small and lig...

Claims

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Application Information

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IPC IPC(8): G03B21/00G03B21/14G03B21/28G02B27/28
CPCG03B21/2073G03B21/208H04N9/3152H04N9/3167
Inventor 秋山光一
Owner SEIKO EPSON CORP