Patent
1983-07-08
1986-08-05
Corbin, John K.
350174, G02B 532, G02B 2714
Patent
active
046039384
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
This invention relates to a method of producing an inline hologram lens in which a full reflection mirror with a small window is used to irradiate a subject wave beam of a spherical wave and a reference wave beam onto a hologram record medium, so that an inline hologram lens can be produced easily.
2. Background Art
As conventional hologram lenses there are proposed an inline hologram lens and an off-axis hologram lens. The recording and reproducing theory of these two hologram lenses will hereinafter be described briefly.
First, the off-axis hologram lens will be described. As shown in FIG. 1, a record surface (photo-sensitive surface) r of a hologram record medium HR is irradiated with a record subject wave beam (spherical wave beam ) A and a record reference wave beam (plane or spherical wave beam) B each at an incident angle of about 45.degree. with respect to the normal direction, namely, each being off-axis to thereby record thereon an off-axis hologram lens portion HL' of, for example, a circular or ellipse shape, which consists of interference images. Here, the description of the development treatment of the record surface r will be omitted. The record subject wave beam A is provided by using an optical lens and is a beam which converges at a point P and diverges after it. Both the beams A and B are formed from a laser beam emitted from the same laser light source. Thus, an off-axis hologram lens OX-L is made.
When the off-axis hologram lens OX-L is reproduced, as shown in FIG. 2, a reproduce reference wave beam B' similar to the beam B is irradiated on the off-axis hologram lens portion HL' from the side opposite to the record surface r of the record medium HR along the extending line of the record reference wave beam B shown in FIG. 1. Then, a reproducing subject wave beam A' is reproduced from the side of the record face r which is converged to a point P'. When the reproducing reference wave beam is irradiated on the record surface r of the record medium HR, just like the record reference wave beam B in FIG. 1, a reproduce subject wave beam is reproduced from the surface of the record medium HR opposite to the record surface r which diverges along the extending line of the record subject wave beam A in FIG. 1.
The inline hologram lens will be described. As shown in FIG. 3, the record subject wave beam (spherical wave beam) A and the record reference wave beam (plane or spherical wave beam) B are irradiated on the record surface r of th hologram record medium HR, which beams are coincident or parallel in optical axis in the direction of the normal, that is, in line with each other, to form thereon an inline hologram lens portion HL consisting of interference images. Other arrangements are the same as those in FIG. 1. Thus, an inline hologram lens IN-L is made.
When the inline hologram lens IN-L is reproduced, as shown in FIG. 4, a reproducing reference wave beam B' similar to the beam B is irradiated on the inline hologram lens portion HL from the side opposite to the record surface r of the record medium HR along the extending line of the record reference wave beam B in FIG. 3, a reproduce subject wave beam A' is reproduced from the record surface r which converges at a point P'. In this case, it is also possible that the reproducing reference wave beam is irradiated on the record surface r of the hologram record medium HR to reproduce the diverging subject wave beam. Other arrangements are the same as those in FIG. 2.
The hologram lenses thus made are light in weight and small in size. Moreover, by arbitrarily selecting a mother lens which emits a subject wave beam, it is possible to provide a lens with a desired N. A. (numerical aperture) and operating distance and it is also possible to mass-produce lenses with the same characteristics by duplication.
By the way, an objective lens, which is used, for example, as an optical signal reproduce head in an optical signal reproducing apparatus, is one which has a rather large N. A., and in the prior art an optical len
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patent: 4218111 (1980-08-01), Withrington et al.
patent: 4312559 (1982-01-01), Kojima et al.
Sweatt, "Achromatic Triplet Using Holographic Optical Elements" Applied Optics, vol. 16, No. 5, May 1977, pp. 1390-1391.
Sincerbox et al., "System to Increase the Efficiency of the Holographic Energy Distribution for Individual Chip Replacement, IBM Tech., vol. 23, No. 2, 7-1980, pp. 831-832.
Hasegawa Kayoko
Kojima Chiaki
Miyahara Kousuke
Corbin John K.
Eslinger Lewis H.
Shapiro B. S.
Sinderbrand Alvin
Sony Corporation
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