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Diffraction optical element

A technology of diffractive optical elements and diffraction gratings, applied in optical elements, diffraction gratings, optics, etc., can solve problems such as uneven hue, cracks in the optical adjustment layer, and difficulty in obtaining optical performance diffractive optical elements, etc., to reduce uneven hue , wide manufacturing tolerance, increase the effect of offset tolerance

Active Publication Date: 2012-12-26
PANASONIC CORP
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Problems solved by technology

[0015] The inventors of the present application have studied the optical characteristics and durability of existing retardation diffractive optical elements, and found that even diffractive optical elements designed to sufficiently obtain optical properties such as MTF (Modulation Transfer Function) are not used in Hue unevenness may also occur during video recording
In addition, it has also been found that cracks appear in the optical adjustment layer during the formation of the optical adjustment layer or during environmental tests such as thermal shock tests.
Furthermore, it has been further found that in the existing diffractive optical element, the allowable error in the shape of the optical adjustment layer for obtaining the optical performance as designed is small, and it is difficult to obtain the optical adjustment layer unless the optical adjustment layer is formed with high precision. Diffractive Optical Elements with Desired Optical Properties

Method used

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no. 1 Embodiment approach

[0051] figure 2 (a) is a sectional view showing an embodiment of the diffractive optical element of the present invention. The diffractive optical element 21 includes a base 1 and an optical adjustment layer 3 . The substrate 1 is made of a first optical material, and the optical adjustment layer 3 is made of a second optical material including a second resin.

[0052] A diffraction grating 2 is provided on one main surface of the substrate 1 . The cross-sectional shape, arrangement, pitch, and depth of the diffraction grating 2 are determined according to the optical properties of the substrate 1 and the optical adjustment layer 3 , and the optical design of the final diffractive optical element 21 to be obtained. For example, to make the diffraction grating 2 function as a lens, it is only necessary to arrange the rings having a zigzag cross-sectional shape in concentric circles so that the pitch gradually decreases from the center to the periphery of the lens. In this c...

no. 2 Embodiment approach

[0082] A second embodiment of the diffractive optical element of the present invention will be described. Figure 4 A cross section of the diffractive optical element 121 is schematically shown. The diffractive optical element 121 differs from the first embodiment in that a synthetic material in which inorganic particles 6 are dispersed in a second resin 7 is used as the second optical material constituting the optical adjustment layer 3'. The applicant of the present invention proposed a diffractive optical element using such a composite material for an optical adjustment layer in International Publication No. 07 / 026597.

[0083] The refractive index and Abbe's number of the second optical material can be adjusted by using a synthetic material in which the inorganic particles 6 are dispersed in the second resin 7 . Therefore, the diffraction efficiency in the wavelength band of the diffractive optical element 121 can be improved by applying the adjusted second optical materi...

Embodiment 1

[0104] Produced with figure 2 (a) Diffractive optical element with the structure shown. The diffractive optical element 21 functions as a lens and is designed to utilize first-order diffracted light. This also applies to the following examples.

[0105] First, polycarbonate resin (d-line refractive index 1.585, Abbe number 28) is injection-molded as the first resin constituting the first optical material of the base body 1, and the envelope surface 4 at the front end of the diffraction grating 2 is produced as A base 1 having an aspheric shape and a ring-shaped diffraction grating 2 having a depth of 39 μm is provided on one surface. The effective radius of the lens part is 1.445 mm, the number of tires is 24, the minimum tire pitch is 30 μm, and the paraxial R [radius of curvature] of the diffractive surface is -1.0144 mm. In addition, the focal length of the diffractive optical element is 1.109mm.

[0106] Next, as a raw material for the second resin of the optical adju...

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Abstract

A diffraction optical element is provided with: a base body which is composed of a first optical material and has a diffraction grating on the surface; and an optical adjustment layer which is composed of a second optical material and is provided on the base body so as to cover the diffraction grating. An envelop surface that passes through the leading edges of the diffraction grating is a curved surface, and the optical adjustment layer has a uniform thickness in the normal line directions from the envelop surface. The diffraction optical element can inhibit uneven hue and crack generation caused by heat shock.

Description

technical field [0001] The present invention relates to a diffractive optical element, and particularly relates to a diffractive optical element composed of two or more different members. Background technique [0002] The diffractive optical element has a structure in which a diffraction grating for diffracting light is provided in a substrate made of an optical material such as glass or resin. Diffractive optical elements are used in optical systems of imaging devices or various optical devices including optical recording devices. For example, lenses and spatial low-pass filters designed to collect diffracted light of a specific order at one point are known. , polarization holography, etc. [0003] Diffractive optical elements have this feature that makes optical systems compact. In addition, contrary to refraction, longer wavelength light is more strongly diffracted. Therefore, by combining a diffractive optical element with a normal optical element that utilizes refract...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/18
CPCG02B5/18G02B5/1876G02B5/1866G02B5/1895
Inventor 村田晶子冈田夕佳末永辰敏安藤贵真
Owner PANASONIC CORP
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