Sharp Kabushiki Kaisha Corporation

Hirotoshi Takemori

Kenji Ohta

Toshikazu Nagaura

Tetsuya Inui

Kazuo Van

Hitoshi Isono

Hirotaka Toki

Michinobu Mieda

Kazunori Matsubara

Hiroo Yoshidome

There is provided a semiconductor laser device containing a laser driver capable of implementing downsizing, thinning and cost reduction of equipment using the laser device. In the semiconductor laser device containing a laser driver, a semiconductor laser element, a laser driver for driving the laser element, and a signal detection part for performing photoelectric conversion are mounted on a common mount surface of a lead frame and moreover accommodated in a common package. Upward of the semiconductor laser element is provided a hologram element for transmitting laser light emitted by the laser element toward a recording medium and then diffracting toward the signal detection part the laser light reflected by the recording medium. The laser driver and the signal detection part are disposed on both sides with respect to an optical axis of the laser element.

Semiconductor laser device containing laser driver and electronic equipment having the same

A fine pattern of an optical device formed by the Photo-Polymer method has a groovea side wallof which is sloped against a surface of stamperThe slope angle &#x3b8; of the side wallsatisfies the following relational expression: Tan(4&#xd7;h&#xd7;w)&#x3c;&#x3b8;&#x3c;80&#xb0; where h: a depth of the grooveand w: a width of a top of a projected portion formed by the side walls. Burrs formed in the optical device are reduced, and thereby mass productivity of the optical device is improved.

Stamper, manufacturing method therefor and optical device manufactured therewith

It can be selected whether to form a both-side wobble groove whose both side walls wobble by irradiating two light beams while oscillating the same along the radius of a magneto-optical master disk, or to form a one-side wobble groove one of whose side walls alone wobbles by irradiating two light beams while fixing one of the same and oscillating the other along the radius of the magneto-optical master disk. Then, either a single one-side or both-side groove for tracking-use is formed by irradiating both the two light beams on a photo-resist applied on a glass substrate in accordance with address data. As a result, grooves of different types, both-side and one-side grooves, can be formed continuously in the exposing process.

Manufacturing method of magneto-optical master disk

An optical disk for use in an optical memory device having guide grooves and pits on one surface thereof, wherein the depth of the guide grooves is different from that of the pits and the distance from the bottom face of each of the guide grooves to the other surface of the optical disk opposite to the one surface of the optical disk on which the guide grooves and pits are disposed is the same as the distance from the bottom face of each of the pits to the other surface of the optical disk opposite to the one surface of the optical disk on which the guide grooves and pits are disposed, and a method for the production of optical memory master plates that are used for the production of the above-mentioned optical disk.

Optical disk with grooves and pits of different depths

A method of manufacturing a stamper includes the steps of coating a flat surface of a substrate with photosensitive material; directing light to a specified position on the photosensitive material to expose it; developing the photosensitive material to make a minute photoresist pattern; etching the substrate to a specified depth with a mask of the photoresist pattern; removing the photoresist as the mask to make a glass master; arbitrarily forming a first nickel layer on a surface of the glass master; forming an intermediate layer of a metal having a smaller linear expansion coefficient than nickel over the first nickel layer; forming a second nickel layer on the intermediate layer to form a conductive film having a two- or three-stratum structure; arbitrarily subjecting the whole substrate to a process to make nickel passive; forming an electroformed layer on the conductive film by an electroforming process; and separating the conductive film from the glass master.

Stamper

Optical disk for use in optical memory devices

Method of manufacturing a stamper

An optical disc comprises an antistatic film of light transmission properties which is formed of a synthetic resin, includes a tin oxide with a phosphorous as electro-conductive filler and is provided on another side of a plastics substrate of the optical disc where an optical beam is applied.

Growing community of inventors

Nara, Japan

Hirotoshi Takemori