JPS61195534U

JPS61195534U -

Info

Publication number: JPS61195534U
Application number: JP8029485U
Authority: JP
Priority date: 1985-05-29
Filing date: 1985-05-29
Publication date: 1986-12-05

Description

[Brief explanation of drawings]

第１図は本考案の光学式ピツクアツプ装置の模
式的平面図、第２図はその受光素子上のスポツト
の模式的平面図、第３図はその他の実施例の模式
的平面図、第４図はその他の実施例の模式的斜視
図、第５図及び第６図はその他の対物レンズの実
施例の斜視図、第７図は従来の光学式ピツクアツ
プ装置の模式的平面図、第８図はその位相型回折
板の平面図、第９図及び第１０図はその他の従来
例の模式的平面図である。１……光源、２……位相型回折板、３……対物
レンズ、４……デイスク、５……受光素子、６…
…共役点、７……凸レンズ、１１……平凸レンズ
、１２……フレネルゾーンパターン。 FIG. 1 is a schematic plan view of the optical pickup device of the present invention, FIG. 2 is a schematic plan view of a spot on the light receiving element, FIG. 3 is a schematic plan view of another embodiment, and FIG. 4 5 and 6 are perspective views of other objective lens embodiments, FIG. 7 is a schematic plan view of a conventional optical pickup device, and FIG. 8 is a schematic perspective view of another embodiment. A plan view of the phase type diffraction plate, and FIGS. 9 and 10 are schematic plan views of other conventional examples. DESCRIPTION OF SYMBOLS 1... Light source, 2... Phase type diffraction plate, 3... Objective lens, 4... Disc, 5... Light receiving element, 6...
...Conjugate point, 7...Convex lens, 11...Plano-convex lens, 12...Fresnel zone pattern.

Claims

[Claims for Utility Model Registration] (1) A light source, an objective lens that converges incident light emitted from the light source and incident on the disk onto the disk, and at least one of the reflected light reflected by the disk. In an optical pick-up device, the optical pick-up device has a light-receiving element that receives a portion of the light, and a diffraction means that is disposed in the optical path of the incident light and the reflected light and that diffracts the incident light into at least two diffracted lights. , an optical pickup device characterized in that it is integrally formed on one surface of an optical means having a lens function disposed in the optical path of the incident light and the reflected light. (2) A utility model characterized in that the optical means is a plano-concave lens in a plano-convex lens disposed between the objective lens and the light source, and the diffraction means is formed on the plane side of the plano-concave lens. An optical pickup device according to claim 1. (3) Claim 1 of the utility model registration claim characterized in that the optical means is the objective lens, and the diffraction means is formed on a surface of the objective lens opposite to the disk. optical pick-up device. (4) The objective lens is a Fresnel lens in which the diffraction means is formed on one surface and a Fresnel zone pattern is formed on the other surface. Optical pick-up device. (5) The optical pickup device according to claim 3, wherein the objective lens is either an aspherical lens or a gradient index lens.