JPS6155047B2 - - Google Patents
Info
- Publication number
- JPS6155047B2 JPS6155047B2 JP54032681A JP3268179A JPS6155047B2 JP S6155047 B2 JPS6155047 B2 JP S6155047B2 JP 54032681 A JP54032681 A JP 54032681A JP 3268179 A JP3268179 A JP 3268179A JP S6155047 B2 JPS6155047 B2 JP S6155047B2
- Authority
- JP
- Japan
- Prior art keywords
- light
- receiving surface
- photodetector
- dividing line
- divided
- 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 7
- 238000001514 detection method Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
Description
【発明の詳細な説明】
本発明は光学式情報記録再生装置等に用いる光
検出装置に関し、フオーカシング信号，トラツキ
ング信号，および情報信号を単一の光検出器を用
いて、良好に検出することができる光検出装置を
提供するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a photodetection device used in an optical information recording/reproducing device, etc., and is capable of satisfactorily detecting a focusing signal, a tracking signal, and an information signal using a single photodetector. The purpose of this invention is to provide a photodetection device that can be used.
以下に、本発明の一実施例について説明する。
第１図は本発明装置の光検出器を示している。こ
の検出器は図のように光，電気変換素子１の受光
面が同心円状に２分割され、かつ、円の中心を通
る線により２分割された４分割構成になつてい
る。信号出力はおのおの独立してとり出せるよう
になつている。ここで光が同図斜線のように受光
面に入射したとき、Ａ，Ｂ，Ｃ，Ｄには、それぞ
れの分割部における照射光量に応じた信号出力が
生ずる。このとき（Ａ＋Ｄ）−（Ｂ＋Ｃ）より、ビ
ーム径の大小に応じた差出力が、また（Ａ＋Ｂ）
−（Ｃ＋Ｄ）より円の中心を通る分割線に垂直な
方向の、光スポツトの移動量もしくは、光量変化
に応じた差出力が、また、（Ａ＋Ｂ＋Ｃ＋Ｄ）よ
り、全光量を検出することができる。 An embodiment of the present invention will be described below.
FIG. 1 shows the photodetector of the device of the invention. As shown in the figure, this detector has a four-segment configuration in which the light-receiving surface of the optical/electrical conversion element 1 is divided into two concentric circles and divided into two by a line passing through the center of the circle. Each signal output can be taken out independently. Here, when light is incident on the light receiving surface as shown by diagonal lines in the figure, signal outputs are generated at A, B, C, and D according to the amount of irradiation light at each divided portion. At this time, from (A+D)-(B+C), the difference output depending on the size of the beam diameter is also (A+B)
-(C+D) can be used to detect the amount of movement of the light spot in the direction perpendicular to the dividing line passing through the center of the circle, or the difference output according to the change in light amount, and (A+B+C+D) can be used to detect the total amount of light.
上記光検出器を用いた光学式情報記録再生装置
の一例を第２図に示す。第２図において２は光
源、３は可動ミラー、４はハーフミラー、５は集
光レンズ、６は情報記録面、７は凸レンズ、１は
上記光検出器である。ハーフミラー４は可動ミラ
ー３と集光レンズ５との間にあり、ここで情報記
録面６により反射された戻り光を分離する。図中
で、可動ミラー３の回転中心部Ｇ点の、集光レン
ズ５による像はG′点にできる。情報記録面６は
反射面であるからG′点と等価な面をＧ点とし、
戻り光を考えた場合、G″点の集光レンズ５およ
び凸レンズ７による像点をＧ点とする。Ｇ点
には、可動ミラー３の回転中心であるＧ点の像が
できている訳だから、可動ミラー３を回転させて
も、Ｇ点は常に一定である。そこで、Ｇ点に
光検出器１を置き、各素子間の距離を適切に選ぶ
ことにより、光検出器１上には、可動ミラー３の
動きに影響されない、適度な大きさをもつ光スポ
ツトを形成することができる。第２図で矢印×か
ら見た光検出器１を第３図に示す。ここで光が斜
線で示したように光検器１の受光面に入射してい
るとすると、光検出器１の各分割部には、照射光
量に応じた信号出力が生じるからこれをおのおの
Ａ，Ｂ，Ｃ，Ｄとする。第２図で、情報記録面６
がＹ方向に変位すれだ、光検出器１上の光スポツ
ト径もそれに応じて変化するから、第３図におい
て、あらかじめ、集光レンズ５の焦点が情報記録
面６に合つている場合に（Ａ＋Ｄ）＝（Ｂ＋Ｃ）と
なるよう、光検出器１上の光スポツトの位置およ
び、大きさを設定しておくと、減算又は加算を行
う演算回路によつて得られる（Ａ＋Ｄ）−（Ｂ＋
Ｃ）という差出力はフオーカスずれに応じたもの
となり、この信号に応じて集光レンズ５をＹ方向
に動かして、フオーカスをとることができる。ま
た再生中に、トラツクが情報記録面６上の光スポ
ツト中央にあれば、（Ａ＋Ｂ）−（Ｃ＋Ｄ）は０に
なるが、中央からずれた場合は、（Ａ＋Ｂ）−（Ｃ
＋Ｄ）に差出力が出るから、この差出力に応じて
可動ミラー３を回転させ、トラツクを追従するこ
とができる。さらに、（Ａ＋Ｂ＋Ｃ＋Ｄ）を求め
れば、それは、そのまま情報信号となる。 An example of an optical information recording/reproducing apparatus using the above photodetector is shown in FIG. In FIG. 2, 2 is a light source, 3 is a movable mirror, 4 is a half mirror, 5 is a condensing lens, 6 is an information recording surface, 7 is a convex lens, and 1 is the photodetector. The half mirror 4 is located between the movable mirror 3 and the condenser lens 5, and separates the returned light reflected by the information recording surface 6. In the figure, the image of the rotation center point G of the movable mirror 3 by the condenser lens 5 is formed as a point G'. Since the information recording surface 6 is a reflective surface, let the surface equivalent to point G' be point G.
When considering the return light, the image point formed by the condensing lens 5 and convex lens 7 at point G is assumed to be point G. This is because the image of point G, which is the center of rotation of movable mirror 3, is formed at point G. , even if the movable mirror 3 is rotated, the G point remains constant.Therefore, by placing the photodetector 1 at the G point and appropriately selecting the distance between each element, the photodetector 1 has the following characteristics: It is possible to form a light spot with an appropriate size that is not affected by the movement of the movable mirror 3. Fig. 3 shows the photodetector 1 seen from the arrow x in Fig. 2. Here, the light is indicated by diagonal lines. Assuming that the light is incident on the light-receiving surface of the photodetector 1 as shown, a signal output corresponding to the amount of irradiated light is generated in each divided section of the photodetector 1. In Fig. 2, the information recording surface 6
is displaced in the Y direction, the diameter of the light spot on the photodetector 1 changes accordingly. Therefore, in FIG. If the position and size of the light spot on the photodetector 1 are set so that A+D)=(B+C), (A+D)-(B+) can be obtained by an arithmetic circuit that performs subtraction or addition.
The difference output C) corresponds to the focus shift, and the focus can be taken by moving the condenser lens 5 in the Y direction in accordance with this signal. Also, during playback, if the track is at the center of the optical spot on the information recording surface 6, (A+B) - (C+D) becomes 0, but if it deviates from the center, (A+B) - (C
+D), the movable mirror 3 can be rotated in accordance with this differential output to follow the track. Furthermore, if (A+B+C+D) is obtained, it becomes an information signal as it is.
このように、本発明によれば、単一の光検出器
は、円状分割線で同心円状に２分割され、かつ円
の中心を通る分割線により４つの分割受光面を有
しているため、円状分割線で分割される内側の受
光面の出力と、外側の受光面の出力との差（（Ａ
＋Ｄ）−（Ｂ＋Ｃ））を演算することにより、シリ
ンドリカルレンズ等を用いることなく容易にフオ
ーカシング制御信号を得ることができるととも
に、円の中心を通る分割線で分割される一方の受
光面の出力と他方の受光面の出力との差（（Ａ＋
Ｂ）−（Ｃ＋Ｄ））を演算することにより、トラツ
キング制御信号を得ることができ、さらに、全て
の受光面の出力の和を演算することにより情報信
号を得ることができ、光学式情報記録再生装置と
して必要な３つの制御信号が得られ、また、調整
も簡単に行なえる等の利点を有するものである。 As described above, according to the present invention, a single photodetector is divided into two parts concentrically by a circular dividing line, and has four divided light-receiving surfaces by a dividing line passing through the center of the circle. , the difference between the output of the inner light-receiving surface and the output of the outer light-receiving surface divided by the circular dividing line ((A
By calculating +D)-(B+C)), a focusing control signal can be easily obtained without using a cylindrical lens, etc., and the output of one light-receiving surface divided by a dividing line passing through the center of the circle. The difference between the output of the other light-receiving surface ((A+
A tracking control signal can be obtained by calculating B)-(C+D)), and an information signal can be obtained by calculating the sum of the outputs of all light-receiving surfaces. This has the advantage that the three control signals necessary for the device can be obtained and adjustments can be easily made.
第１図は本発明の一実施例における光検出装置
の光検出器の受光面の正面図、第２図は同光検出
装置を用いた光学式情報記録再生装置の概略図、
第３図は同光学式情報記録再生装置のブロツク図
である。
１…光検出器、２…光源、３…可動ミラー、４
…ハーフミラー、５…集光レンズ、６…情報記録
面、７…凸レンズ。
FIG. 1 is a front view of the light-receiving surface of a photodetector of a photodetector according to an embodiment of the present invention, and FIG. 2 is a schematic diagram of an optical information recording/reproducing device using the photodetector.
FIG. 3 is a block diagram of the optical information recording and reproducing apparatus. 1... Photodetector, 2... Light source, 3... Movable mirror, 4
... Half mirror, 5... Condensing lens, 6... Information recording surface, 7... Convex lens.
Claims (1)
て、円状分割線で同心円状に２分割されて、内円
部のAD受光面と、外側の環状部のBC受光面が形
成されるとともに、円の中心を通る分割線によ
り、AD受光面がＡ受光面とＤ受光面に分割さ
れ、BC受光面がＢ受光面とＣ受光面に分割さ
れ、かつ、Ａ受光面及びＢ受光面と、Ｃ受光面及
びＤ受光面とが前記分割線をはさんで相対するよ
うに形成された４分割受光面を有する光検出器と
を具備し、各受光面Ａ〜Ｄからの各出力をＡ，
Ｂ，Ｃ，Ｄとした場合、（Ａ＋Ｂ）−（Ｃ＋Ｄ）を
演算してトラツキング制御信号を得、（Ａ＋Ｄ）−
（Ｂ＋Ｃ）を演算してフオーカシング制御信号を
得、（Ａ＋Ｂ＋Ｃ＋Ｄ）を演算して情報信号を得
るように構成された演算手段を有することを特徴
とする光検出装置。1. A light detection device for an optical information recording and reproducing device, which is divided into two concentrically by a circular dividing line to form an AD light-receiving surface in an inner circular portion and a BC light-receiving surface in an outer annular portion. , the dividing line passing through the center of the circle divides the AD light-receiving surface into A light-receiving surface and D light-receiving surface, the BC light-receiving surface is divided into B light-receiving surface and C light-receiving surface, and , a photodetector having a four-part light-receiving surface formed such that the light-receiving surface C and the light-receiving surface D face each other across the dividing line, and each output from each of the light-receiving surfaces A to D is detected as A. ，
In the case of B, C, and D, the tracking control signal is obtained by calculating (A+B)-(C+D), and (A+D)-
A photodetecting device characterized by having a calculation means configured to calculate (B+C) to obtain a focusing control signal and calculate (A+B+C+D) to obtain an information signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3268179A JPS55125417A (en) | 1979-03-20 | 1979-03-20 | Photodetector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3268179A JPS55125417A (en) | 1979-03-20 | 1979-03-20 | Photodetector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS55125417A JPS55125417A (en) | 1980-09-27 |
| JPS6155047B2 true JPS6155047B2 (en) | 1986-11-26 |
Family
ID=12365608
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3268179A Granted JPS55125417A (en) | 1979-03-20 | 1979-03-20 | Photodetector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS55125417A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63176651A (en) * | 1987-01-14 | 1988-07-20 | Shigenobu Fujimoto | Dissociation device for particle |
| JPS6456955A (en) * | 1987-08-27 | 1989-03-03 | Shigeru Sato | Fuel consumption improving device |
| JPH01116275A (en) * | 1987-10-28 | 1989-05-09 | Kenji Yakura | Fuel processing method and its fuel processing device |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5827027A (en) * | 1981-08-11 | 1983-02-17 | Akai Electric Co Ltd | Photo detector |
| JPS59125727U (en) * | 1983-02-15 | 1984-08-24 | パイオニア株式会社 | Optical information pickup device |
| US4654515A (en) * | 1983-05-28 | 1987-03-31 | Kabushiki Kaisha Toshiba | Optical head for focussing a light beam on an information recording medium |
| ITMI20040309U1 (en) | 2004-06-23 | 2004-09-23 | Dario Toncelli | MACHINE FOR THE PROCESSING OF SLAB MATERIALS, IN PARTICULAR NATURAL STONE MATERIAL CERAMIC AND CONGLOMERATE MATERIAL |
| ITTV20040056U1 (en) | 2004-10-20 | 2005-01-20 | Dario Toncelli | COMBINED CUTTING MACHINE FOR SLAB MATERIAL PROCESSING. |
| US10201914B2 (en) | 2015-01-20 | 2019-02-12 | Park Industries, Inc. | Material loading apparatus |
-
1979
- 1979-03-20 JP JP3268179A patent/JPS55125417A/en active Granted
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63176651A (en) * | 1987-01-14 | 1988-07-20 | Shigenobu Fujimoto | Dissociation device for particle |
| JPS6456955A (en) * | 1987-08-27 | 1989-03-03 | Shigeru Sato | Fuel consumption improving device |
| JPH01116275A (en) * | 1987-10-28 | 1989-05-09 | Kenji Yakura | Fuel processing method and its fuel processing device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS55125417A (en) | 1980-09-27 |
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