JPH0452821Y2 - - Google Patents
Info
- Publication number
- JPH0452821Y2 JPH0452821Y2 JP16820084U JP16820084U JPH0452821Y2 JP H0452821 Y2 JPH0452821 Y2 JP H0452821Y2 JP 16820084 U JP16820084 U JP 16820084U JP 16820084 U JP16820084 U JP 16820084U JP H0452821 Y2 JPH0452821 Y2 JP H0452821Y2
- Authority
- JP
- Japan
- Prior art keywords
- photo
- photo sensor
- photo sensors
- sensors
- sets
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 230000003287 optical effect Effects 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 201000009310 astigmatism Diseases 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
Landscapes
- Optical Recording Or Reproduction (AREA)
- Optical Head (AREA)
Description
【考案の詳細な説明】
(イ) 産業上の利用分野
本考案は、４分割フオトセンサよりフオーカス
エラー信号及び情報信号を作成する構成とした光
学式ピツクアツプ装置に関する。[Detailed Description of the Invention] (a) Field of Industrial Application The present invention relates to an optical pickup device configured to generate a focus error signal and an information signal from a four-part photo sensor.
(ロ) 従来の技術
非点収差方式のフオーカス制御の場合、４分割
フオトセンサ（第２図参照）のうち、対角線上の
フオトセンサを組合せて、これ等二組のフオトセ
ンサ出力の差に基いてフオーカスエラー信号を作
成している（例えば、雑誌「無線と実験」昭和57
年11月号、第22頁参照）。そして、４分割フオト
センサの全てのフオトセンサ出力の和に基いて情
報信号を作成している。(b) Conventional technology In the case of astigmatism-based focus control, diagonal photo sensors of the four-split photo sensor (see Figure 2) are combined, and focus is determined based on the difference between the outputs of these two photo sensors. Creating an error signal (for example, the magazine "Radio and Experiments" 1982)
(See November issue, p. 22). Then, an information signal is created based on the sum of all the photo sensor outputs of the four-divided photo sensor.
(ハ) 考案が解決しようとする問題点
第２図に示す従来の４分割フオトセンサＳの間
隔ｇは、フオトセンサ間のリークを無くす為に最
底10μm程度必要である。それ故、この間隔ｇに
あたる光ビームＢの部分は信号として取出すこと
ができない。レーザの光強度分布は第３図に示す
通りであり、４分割フオトセンサＳの中央部分Ｃ
が最も光強度が強いことになるが、この部分の光
量を信号として利用していないことになる。１個
のフオトセンサの一辺を40μm、間隔を10μmとし
て光ビームＢの直径を90μmとした場合、20％強
の光量が間隔ｇにより失われることになる。(c) Problems to be Solved by the Invention The distance g between the conventional four-segment photo sensors S shown in FIG. 2 needs to be approximately 10 μm at the bottom in order to eliminate leakage between the photo sensors. Therefore, the portion of the light beam B that falls within this interval g cannot be extracted as a signal. The light intensity distribution of the laser is as shown in Fig. 3, and the central part C of the 4-split photo sensor S
This means that the light intensity of this part is the strongest, but the light intensity of this part is not used as a signal. If one side of one photo sensor is 40 μm, the interval is 10 μm, and the diameter of the light beam B is 90 μm, a little more than 20% of the light quantity will be lost due to the interval g.
更に、ピツクアツプ装置の小型化の面から、光
路長を短くすることを考えると、それだけ、フオ
トセンサの面積が小さくなり、間隔ｇの占める面
積の、フオトセンサ面積に対する割合が増大し、
失われる光量が更に多くなる。 Furthermore, if we consider shortening the optical path length from the viewpoint of downsizing the pickup device, the area of the photo sensor will become smaller, and the ratio of the area occupied by the interval g to the area of the photo sensor will increase.
Even more light is lost.
(ニ) 問題点を解決するための手段
第１図に示す如く、一方の対角線上のフオトセ
ンサを連続させて一つのフオトセンサS1とする。
他方の対角線上のフオトセンサS2，S3はそのまま
分離した状態とする。(d) Means for solving the problem As shown in FIG. 1, photo sensors on one diagonal are connected to form one photo sensor S1 .
The photo sensors S 2 and S 3 on the other diagonal are kept separated.
(ホ) 作用
フオーカスエラー信号はフオトセンサ出力をS1
−S2＋S3として演算し、作成する。この場合、一
組のフオトセンサを連続させたことによりオフセ
ツトを生じることになるが、これは電気回路的に
オフセツト調整回路を設けることにより解消でき
る。また、情報信号はフオトセンサ出力をS1＋S2
＋S3として演算することにより作成することがで
き、十分な光量を得ることができる。(e) Effect The focus error signal is the photo sensor output S 1
Calculate and create -S 2 + S 3 . In this case, an offset will occur due to the continuous arrangement of one set of photo sensors, but this can be eliminated by providing an electrical offset adjustment circuit. Also, the information signal is the photo sensor output S 1 + S 2
It can be created by calculating +S 3 , and a sufficient amount of light can be obtained.
尚、オフセツト調整回路は、対物レンズがデイ
スクに近づいた場合と遠ざかつた場合とに於い
て、対物レンズに入射する光量の相違に基因して
生ずるオフセツトに対しても設ける必要がある。 The offset adjustment circuit must also be provided to compensate for the offset that occurs due to the difference in the amount of light incident on the objective lens when the objective lens approaches and moves away from the disk.
(ヘ) 考案の効果
本考案に依れば、フオトセンサ上に於ける光量
損失を低減でき、情報信号の検出に際して十分な
光量を得ることができる。(f) Effects of the invention According to the invention, it is possible to reduce the loss of light amount on the photo sensor, and it is possible to obtain a sufficient amount of light when detecting an information signal.
第１図は本考案に係るフオトセンサを示す図、
第２図は従来のフオトセンサを示す図、第３図は
レーザの強度分布を示す図である。
S1，S2，S3はフオトセンサ。
FIG. 1 is a diagram showing a photo sensor according to the present invention;
FIG. 2 is a diagram showing a conventional photo sensor, and FIG. 3 is a diagram showing a laser intensity distribution. S 1 , S 2 , and S 3 are photo sensors.
Claims (1)
ンサを組合せて二組のフオトセンサ出力を得、こ
れ等二組のフオトセンサ出力の差に基いてフオー
カスエラー信号を作成し、且つ前記４分割フオト
センサの全てのフオトセンサ出力の和に基いて情
報信号を作成する構成とした光学式ピツクアツプ
装置であつて、 前記二組のフオトセンサのうち一方の組のフオ
トセンサ間を連続させたことを特徴とする光学式
ピツクアツプ装置。[Claims for Utility Model Registration] Two sets of photo sensor outputs are obtained by combining photo sensors on diagonals among the four-split photo sensors, and a focus error signal is created based on the difference between these two sets of photo sensor outputs, and An optical pickup device configured to create an information signal based on the sum of all photo sensor outputs of four-divided photo sensors, characterized in that one of the two sets of photo sensors is connected continuously. Optical pick-up device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16820084U JPH0452821Y2 (en) | 1984-11-06 | 1984-11-06 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16820084U JPH0452821Y2 (en) | 1984-11-06 | 1984-11-06 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6183120U JPS6183120U (en) | 1986-06-02 |
| JPH0452821Y2 true JPH0452821Y2 (en) | 1992-12-11 |
Family
ID=30725979
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16820084U Expired JPH0452821Y2 (en) | 1984-11-06 | 1984-11-06 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0452821Y2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2537840B2 (en) * | 1987-02-20 | 1996-09-25 | 松下電器産業株式会社 | Photodetector |
-
1984
- 1984-11-06 JP JP16820084U patent/JPH0452821Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6183120U (en) | 1986-06-02 |
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