Projection optical system and image projection device
A technology for projecting optical systems and images, applied in optics, projection devices, optical components, etc., can solve problems such as differences and cost increases
Active Publication Date: 2022-07-15
RICOH IND SOLUTIONS INC
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[0004] However, such a catadioptric element usually has an aspheric reflective surface of a curved mirror, and the incident surface on the lens side and the outgoing surface are composed of the same spherical surface. Therefore, different manufacturing processes are required on the two surfaces, resulting in a problem of cost increase.
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[0020] As one of the embodiments of the present invention, an example of the configuration of the image projection apparatus is given in figure 1 shown in.
[0021] The image projection apparatus 100 includes a light source 101 that emits a light beam L0 as an imaging light beam, and an image display element 102 that displays an image to be projected on an image display surface and applies image information to the transmitted light beam.
[0022] The image projection apparatus 100 further includes: a lens unit 200 including a projection optical system for projecting an image onto a projection surface 104 serving as a projected surface; and a control unit that controls an image display element in order to display an image to be projected on the projection surface 104 102.
[0023] The light source 101 uses a halogen lamp as a light emitting source that emits light, and emits white light substantially in parallel. Here, metal halide lamps, high-pressure mercury lamps, and LEDs...
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A projection optical system and an image projection device. The projection optical system is formed by sequentially arranging a refractive optical system and a refractive and reflective optical element from one side of the image display surface to the side of the projected surface, and the refractive optical system is composed of a plurality of lenses The refracting and reflecting optical element is provided with a reflective surface member having a reflective surface, and a refracting medium portion arranged in close contact with the reflective surface, and is constituted as an independent optical element in which the reflective surface member and the refracting medium portion are joined at the boundary surface, and the refracting medium portion is formed as an independent optical element. The part is formed with the incident surface and the outgoing surface of the imaging beam emitted from the refracting optical system, and the reflective surface is a curved surface with refractive power. An intermediate image of one or more images displayed on the image display surface is formed between the incident surface and the reflection surface of the refraction and reflection optical element.
Description
technical field [0001] The present invention relates to a projection optical system and an image projection device. Background technique [0002] In optical apparatuses such as image projection apparatuses using reflective projection optical systems represented by cameras and projectors, further miniaturization is required, and miniaturization of reflecting mirrors has become a problem. [0003] As means for solving such a problem, for example, a refracting and reflecting element is known which combines the properties of a lens having refractive power and a curved mirror (for example, refer to Patent Documents 1 and 2, etc.). [0004] However, such a refracting and reflecting element usually has an aspherical reflective surface of the curved mirror, and the incident surface and the emitting surface on the lens side are composed of the same spherical surface. Therefore, the two surfaces require different manufacturing steps, which leads to a problem of increasing cost. [00...
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IPC IPC(8): G03B21/14G03B21/28G02B17/08
CPCG03B21/14G03B21/28G02B17/08
Inventor 石龟贵幸
Owner RICOH IND SOLUTIONS INC