Wave plate, polarization conversion element, lamp optical system and image display device
A technology of polarized light and p-polarized light, applied in polarizing elements, optics, projection devices, etc., can solve problems such as difficult to eliminate the bad influence of conversion efficiency, and achieve the effect of high heat resistance
Inactive Publication Date: 2013-06-05
SONY CORP
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Problems solved by technology
Angle dependence, which may not have existed in the past, is now very significant, and it is difficult to eliminate the adverse effect on conversion efficiency
Method used
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[0026] The present invention will be described below through preferred embodiments with reference to the accompanying drawings. However, the present disclosure is not limited to the following examples.
[0027] The wave plate of the present invention is made of two quartz plates 1 and 2 as shown in Figure 5, with reference to figure 1 ~ FIG. 3 illustrates the method of manufacturing the quartz plates 1 and 2.
[0028] First, if figure 1 As shown, the quartz crystal is placed on, for example, a cutting machine in the direction of the optical axis C-axis, and a thin slice of approximately 0.15 mm is cut at an angle of approximately 27.3 degrees to a plane perpendicular to the C-axis, that is, Z-cut. Note that due to the problem of processing accuracy, in the actual processing process, the cutting angle is allowed to vary between 25 degrees and 28.8 degrees, and the cutting thickness of the sheet can also vary between 0.135mm and 0.165mm. pass figure 1 In the Z-cut method ...
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Abstract
The invention provides a wave plate, a polarization conversion element, a lamp optical system and an image display device. The wave plate is formed by a first quartz plate and a second quartz plate in an overlapped mode, the optical axis of the first quartz plate and the optical axis of the second quartz plate are respectively inclined relative to a main surface of the first quartz plate and a main surface of the second quartz plate, a first angle formed by the projection of the optical axis of the first quartz plate on the main surface of the first quartz plate and a long side of the first quartz plate is in the range which is larger than 22.5 degrees and smaller or equal to 25.4 degrees, a second angle formed by the projection of the optical axis of the first quartz plate on the main surface of the first quartz plate and the long side of the first quartz plate is in the range which is larger than or equal to 64.6 degrees and smaller than 67.5 degrees, and third angles formed respectively by the optical axis of the first quartz plate and the direction perpendicular to the main surface of the first quartz plate as well as the optical axis of the second quartz plate and the direction perpendicular to the main surface of the second quartz plate are in the range which is larger than or equal to 25 degrees and smaller than or equal to 28.8 degrees. The wave plate can take light resistance, heat resistance and high efficiency into account comprehensively.
Description
technical field [0001] The present invention relates to a wave plate that changes the polarization direction of transmitted light, a polarization conversion element, an illumination optical system, and an image display device using the wave plate. Background technique [0002] Projectors have been widely used for many years as devices for performing presentations and other functions in the business field. In recent years, with the continuous reduction of the price of projectors and the improvement of people's living standards, projectors have widely entered thousands of households as display devices for home theaters. Followed by higher requirements for miniaturization, improvement of resolution and improvement of light utilization efficiency. [0003] Therefore, as a means of improving light utilization efficiency, a polarization conversion element is built into the liquid crystal projector, and the polarization conversion of the light emitted by a light source such as a h...
Claims
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IPC IPC(8): G02B5/30G02B27/28G03B21/14G03B21/20G02F1/13357G02F1/1335
Inventor 加藤佑嗣堀越涼子
Owner SONY CORP