JPS61195533U

JPS61195533U -

Info

Publication number: JPS61195533U
Application number: JP8029385U
Authority: JP
Priority date: 1985-05-29
Filing date: 1985-05-29
Publication date: 1986-12-05

Description

[Brief explanation of the drawing]

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図は従来の光学式ピツクアツプ装
置の模式的平面図、第５図はその位相型回折板の
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、１１……平行平板、１２……位相型回
折板、１３……くさび板。 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 is a schematic plan view of a conventional optical pickup device, and FIG. 5 is a plan view of its phase type diffraction plate. DESCRIPTION OF SYMBOLS 1... Light source, 2... Phase type diffraction plate, 3... Objective lens, 4... Disk, 5... Light receiving element, 6...
...Conjugate point, 11...Parallel plate, 12...Phase type diffraction plate, 13...Wedge plate.

Claims

[Claims for Utility Model Registration] A light source, an objective lens that converges incident light emitted from the light source and incident on the disk onto the disk, and receives at least a portion of the reflected light reflected by the disk. and a diffraction means disposed in the optical path of the incident light and the reflected light to diffract the incident light into at least two diffracted lights, the optical pickup device comprising: A parallel flat plate or a wedge plate is disposed within the disk so that at least one surface thereof is inclined with respect to the optical axis of the incident light incident on the disk through the objective lens, and the parallel plate or wedge plate An optical pickup device characterized in that the diffraction means is formed on one surface or the other surface of the optical pickup device.