JPH0193622U - - Google Patents

Description

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は、本考案の一実施例の概略側断面図、
第２図ａ及び第２図ｂは、それぞれ実施例の収束
位置での光束の断面形状及び受光素子のチツプ形
状を示す図、第３図ａ及び第３図ｂは、それぞれ
他の実施例の収束位置での光束の断面形状及び受
光素子のチツプ形状を示す図、第４図は、更に他
の実施例の概略側断面図、第５図は、従来例の概
略側断面図である。 １ａ，１ｂ……半導体レーザー光源、３ａ，３
ｂ……ビームスプリツター、５……プリズム、６
……集光レンズ、７……光検出器、７ａ，７ｂ…
…受光素子、１０……デイスク状記録媒体、１２
ａ，１２ｂ……反射光、１２ａ′，１２ｂ′……
反射光の収束位置でのスポツト、１４……ホログ
ラム素子。 FIG. 1 is a schematic side sectional view of an embodiment of the present invention;
Figures 2a and 2b are diagrams showing the cross-sectional shape of the light beam and the chip shape of the light receiving element at the convergence position of the embodiment, respectively, and Figures 3a and 3b are diagrams of the other embodiments, respectively. FIG. 4 is a schematic side sectional view of still another embodiment, and FIG. 5 is a schematic side sectional view of a conventional example. 1a, 1b... semiconductor laser light source, 3a, 3
b... Beam splitter, 5... Prism, 6
...Condenser lens, 7...Photodetector, 7a, 7b...
... Light receiving element, 10 ... Disc-shaped recording medium, 12
a, 12b...Reflected light, 12a', 12b'...
Spot at the convergence position of reflected light, 14... Hologram element.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 波長の異なる複数個の光ビームで情報記録媒体
を照射し、同時に複数の異なる情報の記録再生を
行うように構成された光ピツクアツプ装置におい
て、情報記録媒体から反射された信号光を同一の
光路を経て光検出器に導く集光手段として、波長
によつて光軸方向の収束位置が異なる集光手段を
用いると共に、特定の波長の信号光の収束点に、
収束した信号光に対応する受光素子チツプと収束
しない信号光に対応する受光素子チツプとを備え
た分割型光検出器を配置したことを特徴とする光
ピツクアツプ装置。 In an optical pickup device that is configured to irradiate an information recording medium with multiple light beams of different wavelengths and simultaneously record and reproduce multiple different pieces of information, the signal light reflected from the information recording medium is routed along the same optical path. As a condensing means for guiding the light to the photodetector, a condensing means whose convergence position in the optical axis direction differs depending on the wavelength is used, and at the convergence point of the signal light of a specific wavelength,
An optical pickup device characterized in that a split-type photodetector is arranged, which includes a light-receiving element chip corresponding to converged signal light and a light-receiving element chip corresponding to non-convergent signal light.