Sony Corporation

Kayoko Hasegawa

Chiaki Kojima

Hiroshi Ohki

Kosuke Miyahara

Kousuke Miyahara

Method of producing inline hologram lens

A method of producing an inline hologram lens is disclosed which includes the steps of producing a diffracted wave beam by a diffraction device, producing a spherical wave beam by an optical device, providing the diffracted wave beam perpendicularly incident on a photo-sensitive layer as a reference wave beam, simultaneously providing a spherical wave beam perpendicularly incident on the photo-sensitive layer as a subject wave beam through the diffraction device, and developing the photo-sensitive layer to produce an inline hologram lens.

Method for manufacturing in-line hologram lens

An inline hologram lens suitable for use in an optical reproducing head is formed by first preparing a mother off-axis hologram lens by exposing a photo-sensitive layer to a subject wave beam and an off-axis reference wave beam, and then developing the photo-sensitive layer; and subsequently by forming the inline hologram lens by exposing a second photo-sensitive layer to an interference pattern formed by passing an inline reference wave beam through the mother off-axis hologram lens to be incident normal to the second photo-sensitive layer while passing an off-axis subject coherent beam at an angle through said off-axis mother hologram lens to form a subject beam that is focussed a predetermined distance from the second photo-sensitive layer, and finally by developing the second photo-sensitive layer. Preferably, the mother hologram lens has a diffraction efficiency of less than unity. An optical reproducing head utilizing such an inline hologram lens includes a beam-splitter, a quarter-wave plate, the inline hologram lens, and a transparent adhesive to adhere the beam-splitter, plate, and lens to one another.

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Kamakura, Japan

Kayoko Hasegawa