JPS6186826U

JPS6186826U -

Info

Publication number: JPS6186826U
Application number: JP17266084U
Authority: JP
Priority date: 1984-11-14
Filing date: 1984-11-14
Publication date: 1986-06-06

Description

[Brief explanation of the drawing]

第１図は本考案の情報記録円盤の角度を検出す
る検出手段の光学系の構成を示す断面図、第２図
はその他の実施例の断面図、第３図はそのさらに
他の実施例の断面図、第４図は従来の検出装置の
光学系の構成を示す断面図である。１０……デイスク、２０……ピツクアツプ、２
１……光源、２２……ビームスプリツタ、２３…
…対物レンズ、２４，３２，３３……受光素子、
３１……発光ダイオード、３４……差動増幅器、
４０……絞り、４１，５０……臨界角プリズム、
６０……多層膜板。 FIG. 1 is a sectional view showing the configuration of the optical system of the detection means for detecting the angle of the information recording disk of the present invention, FIG. 2 is a sectional view of another embodiment, and FIG. 3 is a sectional view of still another embodiment. 4 is a sectional view showing the configuration of an optical system of a conventional detection device. 10...Disk, 20...Pickup, 2
1...Light source, 22...Beam splitter, 23...
...Objective lens, 24, 32, 33... Light receiving element,
31...Light emitting diode, 34...Differential amplifier,
40...Aperture, 41,50...Critical angle prism,
60...Multilayer film board.

Claims

[Scope of Claim for Utility Model Registration] (1) An information recording disk that detects the relative inclination of an information recording disk and a pick-up that records and reproduces information by irradiating the information recording disk with recording and reproducing light such as a laser beam. The tilt detection device includes a light source disposed in the pickup and emits a detection light beam at a predetermined angle to the information recording disk, and a zero-order light of the light beam emitted from the light source and reflected and diffracted by the information recording disk. a splitting means disposed in the optical path of the zero-order light and splitting the zero-order light into two, a transmitted light and a reflected light;
What is claimed is: 1. An information recording disk tilt detection device comprising: one light receiving element and a differential amplifier that obtains a difference signal between the outputs of the two light receiving elements. (2) The dividing means is a critical angle prism, and the zero-order light is incident on a predetermined surface of the prism at an angle near the critical angle, as stated in claim 1 of the utility model registration claim. Information recording disc tilt detection device. (3) Utility model registration claim 2, characterized in that the approximately critical angle prism has at least two surfaces on which the zero-order light is incident at an angle near the critical angle.
Information recording disk tilt detection device described in Section 2. (4) The information recording disk inclination detection device according to claim 1, wherein the dividing means is a multilayer film plate. (5) The information recording disk inclination detection device according to any one of claims 1 to 4 of the utility model registration claim, characterized in that a diaphragm is provided in the vicinity of the light source.