JPS5975760A - Photoscanning system - Google Patents
Photoscanning systemInfo
- Publication number
- JPS5975760A JPS5975760A JP57187202A JP18720282A JPS5975760A JP S5975760 A JPS5975760 A JP S5975760A JP 57187202 A JP57187202 A JP 57187202A JP 18720282 A JP18720282 A JP 18720282A JP S5975760 A JPS5975760 A JP S5975760A
- Authority
- JP
- Japan
- Prior art keywords
- time
- scan
- effective
- scanning
- light
- 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.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Mechanical Optical Scanning Systems (AREA)
- Facsimile Scanning Arrangements (AREA)
Abstract
Description
【発明の詳細な説明】
（１）発明の技術分野
本発明はガルバノミラ−等の揺動型ビーム往復走査手段
により走査された光ビームを利用して記録、加工、情報
読取り等を行う光走査方式に関する０
（２）技術の背常
揺動型の往復走査手段を用いて光ビームの往仮走査を行
うと、光学系の小型化とともに装置の高速化も可能とな
る。しかしこの往復走査手段を用いた場合走査方向反転
時の再現性が不良であって、高解像化のためには往路と
復路の走査の始点、終点の位置を正確に決定する必要が
ある。Detailed Description of the Invention (1) Technical Field of the Invention The present invention relates to an optical scanning method that performs recording, processing, information reading, etc. using a light beam scanned by an oscillating beam reciprocating scanning means such as a galvanometer mirror. 0 (2) If the forward scanning of the light beam is performed using the back-swing type reciprocating scanning means of the technique, it becomes possible to miniaturize the optical system and increase the speed of the apparatus. However, when this reciprocating scanning means is used, the reproducibility when reversing the scanning direction is poor, and in order to achieve high resolution, it is necessary to accurately determine the positions of the starting and ending points of the forward and backward scanning.
（３）従来技術と問題点
往復光走査装置では光ビームの走置範囲の両端付近に２
個の光ビーム検出センサを設けこのセンサによって実効
走査の開始と実効走査の終了を検出する。光ビームが第
１のセンサ通過後、実効走査終了を検出しその後走査方
向を反転させるため往復走査手段の回転方向を反転させ
る。そして再び光ビームが第１のセンサ通過後実効走査
開始を検出する、従来装置ではこの開光ビームを点灯状
態のままにしていた。この点灯時間は走ｆ祁囲の実効走
置範囲たとえば印字領域での点灯時間に比べ長時間であ
るため光源となる半導体レーザ等の寿命時間が短かくな
るという欠点を有していた。(3) Conventional technology and problems In the reciprocating optical scanning device, there are two
A plurality of light beam detection sensors are provided, and these sensors detect the start of effective scanning and the end of effective scanning. After the light beam passes through the first sensor, the end of the effective scan is detected and then the direction of rotation of the reciprocating scanning means is reversed in order to reverse the scanning direction. Then, in the conventional device, which detects the start of effective scanning after the light beam passes the first sensor again, this light beam is left in the illuminated state. This lighting time is longer than the lighting time in the effective running range, such as the printing area, and has the disadvantage that the lifetime of the semiconductor laser or the like serving as the light source is shortened.
（４）発明の目的
本発明は上記従来の欠点に鑑み、実効短資範囲外では光
ビームを消灯することによりて、光源の長寿命化を計る
ことにある。(4) Purpose of the Invention In view of the above-mentioned drawbacks of the conventional art, the present invention aims to extend the life of the light source by turning off the light beam outside the effective short-term investment range.
（５）発明の構成
そしてこの目的は本発明によれば、往復光走査する往復
走査手段を、該往復走査手段によって決定される走査範
囲の両端付近に設けられ各実効走査の開始及び終了を検
出する”Ｒ１＋ ’Ａ ２の光検出手段とを備え、該第
１．第２の光横用手段によって検出される実効走査終了
時直後から実効走査開始時直前の間は光源を消灯するこ
とを特徴とする光走査方式を礎供することによって速成
される。(5) Structure and object of the invention According to the present invention, a reciprocating scanning means for performing reciprocating optical scanning is provided near both ends of a scanning range determined by the reciprocating scanning means to detect the start and end of each effective scan. and a light detection means of "R1+'A2", and is characterized in that the light source is turned off from immediately after the end of the effective scan detected by the first and second light horizontal means to immediately before the start of the effective scan. This is achieved quickly by providing an optical scanning system based on the following.
（６）発明の実施例
以下、本発明の一実施例をレーザプリンタを例にとり、
図面〈よって詳述する。第１図はレーザプリンタの概略
を示す斜視図、第２図は本発明の詳細な説明するだめの
図であり、第１図、第２図において同一部分は同一番号
で示しである。なお本実施例は光源として半導体レーザ
、往復走査手段としてガルバノミラ−を用いている。(6) Embodiment of the Invention Hereinafter, an embodiment of the present invention will be explained by taking a laser printer as an example.
The drawings will be described in detail. FIG. 1 is a perspective view schematically showing a laser printer, and FIG. 2 is a diagram for explaining the present invention in detail. Identical parts in FIGS. 1 and 2 are designated by the same numbers. In this embodiment, a semiconductor laser is used as a light source, and a galvano mirror is used as a reciprocating scanning means.
第１図において半導体レーザ１から出力さ九たレーザビ
ームはコリメータ２によシ必要なビーム径に調節された
後、ガルバノミラ−３により走査され、結像系４により
光導電体ドラム５上の走査線１４に集光され、そして等
スポイト径で往復走査する。同時に光導′電体ドラム５
は光ビーム走査と垂直方向に移動するのでドア）による
印字ノ（ターンを光導電体ドラム５上に４光させること
ができ、電子写真プロセスにより普通紙上にドツトに−
よるパターンを印字することができる。In FIG. 1, a laser beam output from a semiconductor laser 1 is adjusted to a required beam diameter by a collimator 2, then scanned by a galvanometer mirror 3, and then scanned by an imaging system 4 onto a photoconductor drum 5. The light is focused on a line 14 and scanned back and forth with an equal dropper diameter. At the same time, the photoconductive drum 5
Since the light beam moves in the direction perpendicular to the scanning of the light beam, the printing mark (turn by the door) can be made into four beams on the photoconductor drum 5, and the electrophotographic process can be applied to the plain paper as a dot.
It is possible to print different patterns.
次に第２図を用いて本発明の詳細な説明する。Next, the present invention will be explained in detail using FIG. 2.
同図において、１２．１３はドラム５上の走・を線１４
に対応したもので、１２は往路の走査線、１３は回路の
走査線を示す。光検出器６により往路走査１２の実効走
査の開始を検出し、光検出器７により往路走査の実効走
査の終了を検出する。さらにガルバノミラ−３が反転さ
れたのち光検出器７により復路走査１３の実効走査開始
を瑛出するとともに往路走査１２の終了検出時から復路
走査１３の開始検出時までの時間ｔを計測するＯこの時
間ｔから時間１．、１２を減算した値Ｔ＝ ｔ （ｔ
＋＋ｔｔ）が半導体レーザ１の往路消灯時間になる。こ
の場合時間ｔ、はガルバノミラ−３の反転の際の機械的
動作の停止から駆動に経るまでの時間のバラツキの最大
値にマージンを含んだ値であり、時間ｔ。In the same figure, 12.13 is the running line 14 on the drum 5.
12 indicates the forward scan line, and 13 indicates the circuit scan line. The photodetector 6 detects the start of the effective scan of the forward scan 12, and the photodetector 7 detects the end of the effective scan of the forward scan. Furthermore, after the galvanometer mirror 3 is reversed, the photodetector 7 detects the effective start of the backward scan 13 and measures the time t from when the end of the forward scan 12 is detected to when the start of the backward scan 13 is detected. From time t to time 1. , 12 subtracted T = t (t
++tt) is the forward turn-off time of the semiconductor laser 1. In this case, the time t is a value that includes a margin in the maximum value of the variation in time from the stop of mechanical operation to the start of driving when the galvano mirror 3 is reversed.
はレーザビームを光検出器７が検出するため、半導体レ
ーザ１を点灯させるのに要する時間の最大値にマージン
を含んだ値である。また同様にして、光検出器６により
復路走査１３の実効走査終了を検出し、これに続く往路
走査１２の実効走査開始を検出する寸での時間ｔ′を計
測し、復路消灯時間Ｔ’＝ ｔ’−（ｔ’、 ＋ ｔ’
、）を同様の演法法で求めるーこのようにして求めた往
路消灯時間Ｔ、峻開路消灯時間、だけ半導体レーザ１を
消灯するが、そのだめの制御回路８を第３図に示すブロ
ック図を用いて説明する。同図において第１図と同一番
号は同一部分を示す。光検出器６．７により後略、往路
の実効走査終了を検出し、そのそれぞれの検出信号を時
間計測部１７に出力する。時間計測部１７は復路、往路
それぞれの実効走査終了検出信号入力時点から、次に光
検出器６．７が検出する往路、復路それぞれの実効走；
１１：開始検出信号が人力されるヰでの時間１． １．
をそれぞれ計測する。is a value including a margin in the maximum time required to turn on the semiconductor laser 1 because the photodetector 7 detects the laser beam. Similarly, the photodetector 6 detects the end of the effective scan of the backward scan 13 and measures the time t' at which the start of the subsequent forward scan 12 is detected, and the backward light-off time T'= t'-(t', + t'
, ) are determined using a similar algorithm.The semiconductor laser 1 is turned off by the outgoing turn-off time T and steep open turn-off time determined in this way.The block diagram of the control circuit 8 shown in FIG. Explain using. In this figure, the same numbers as in FIG. 1 indicate the same parts. The photodetector 6 . 7 detects the end of effective scanning on the forward path, and outputs each detection signal to the time measuring section 17 . The time measuring unit 17 starts from the input point of the effective scan end detection signal for each of the backward and forward paths, and then detects the effective scan for each of the forward and backward paths detected by the photodetector 6.7;
11: Time at which the start detection signal is manually input 1. 1.
Measure each.
さらに演ｊｆ部１５で時間計側部１７で得られる時間１
．１．からＦ９［定の時間（ｔ＋＋ｔ２）、（ｔ’ｌ＋
ｔ’２）それぞれを減算する演算を行い、得られた往路
消灯時間Ｔ、、路消灯時間Ｔ′を記憶部１（１，１１で
記憶する。ここで選択部１６は１回目の往復走査以降に
光検出器６．７で検出された走査に、８了の信号が入力
されると、記憶部１０．１１から往路消灯時間Ｔ、、路
消灯時間Ｔ′を読み出す信号を出力し、１回目の往復走
査で光検出器６．７で検出された走査終了の信号が入力
された場合には、前述したように演Ｗ、部１５で往路消
灯時間Ｔ、包絡路消灯時間′を演算させる信号を出力す
る。このようにして記１、ぐ部１０．１１で読み出きれ
た往路消灯時間Ｔ、復路消灯時間Ｔ′に従って制御部９
は半纏体レーザ１を消灯する１ご号を出力し、Ｔ、Ｔ′
時Ｉｆ！３ ｆ、４：過般半導体レーザを再び点灯させ
る信号を出力する。Furthermore, the time 1 obtained by the hour meter side part 17 is calculated by the performance part 15.
．． 1. to F9 [fixed time (t++t2), (t'l+
t'2) Perform a calculation to subtract each of them, and store the obtained forward light-off time T and road light-off time T' in the storage unit 1 (1, 11). Here, the selection unit 16 selects When an 8 completion signal is input to the scan detected by the photodetector 6.7, a signal is output to read out the outgoing light-off time T, and the road light-off time T' from the storage unit 10.11, and the first time is read out. When the scan end signal detected by the photodetector 6.7 during the reciprocating scan is input, as described above, the signal that causes the forward path light-off time T and the envelope path light-off time' to be calculated in the operation unit 15 is input. In this way, the controller 9 outputs the light-off time T for the outward trip and the light-off time T' for the return trip that have been read out in section 10.11.
outputs the number 1 to turn off the semi-integrated laser 1, T, T'
If! 3f, 4: Outputs a signal to turn on the general semiconductor laser again.
本実施例において、１ラインの全走査時間を１００係と
すると、実効足置時間はそのうちの６０φ程度で、その
うち通常の印字データを印字するための点灯時間は最大
１０−程度である。また英効疋査終了から実効走査開始
までの時間は全走査時間の約４０％である。したがって
本発明によって従来、全走査時間に比べて約５０チであ
った点灯時間が約１０ ％ （１１５）の点灯時間にな
るので半導体レーザの寿命を約５倍長くできる。In this embodiment, assuming that the total scanning time for one line is 100 times, the effective foot placement time is about 60 mm, and the lighting time for printing normal print data is about 10 mm at most. Further, the time from the end of the effective scan to the start of the effective scan is approximately 40% of the total scan time. Accordingly, according to the present invention, the lighting time is reduced to about 10% (115) of the total scanning time, which was conventionally about 50 degrees, so that the life of the semiconductor laser can be extended about five times.
また各走査ごとに実効走置か呼子からガルバノミラ−を
反転し、その談の央効足丘開始までの１寺間Ｔ、Ｔ、を
計…１］シ更新したりする方式を用いることもできる。It is also possible to use a method in which the galvano mirror is inverted from the effective scanning point to the beginning of the effective scanning direction for each scanning, and the total of one term T, T, up to the start of the central effective footing of that scanning is updated.
さらに本実施例では、ガルバノミラ−走査反転時のバラ
ツキ時間ｔ、などの所定時間をあらかじめ設定して固定
しておく方式について述べたが、各走査ごとにこの時１
６１設足値をチェックし、必敬があれば咀新する方式を
用いることもある。この方式によると所定時間の最悪時
の値を走査手段（本実施例ではガルバノミラ−）の標単
的な定食特性による値にマージンを含めて設定できるの
で、走査手段の最悪時の走査特性による値にさらにマー
ジンを含めて設定する本実施例にくらべ、さらにレーザ
ビームの点灯時間を短かくでき長寿命化できる。Furthermore, in this embodiment, a method has been described in which a predetermined time such as the variation time t at the time of galvanomirror scan reversal is set and fixed in advance.
A method may be used in which the 61-set value is checked and revised if necessary. According to this method, the value at the worst time for a predetermined time can be set by including a margin in the value based on the standard set-feeding characteristic of the scanning means (galvanomirror in this embodiment), so the value based on the worst time scanning characteristic of the scanning means can be set. Compared to this embodiment in which a margin is included in the settings, the lighting time of the laser beam can be further shortened and the life span can be extended.
（７）発明の効果
以上詳細に説明したように、本発明によれば走査範囲外
では光源を消灯することによって、光源の寿命を長くで
きる効果がある。(7) Effects of the Invention As described above in detail, the present invention has the effect of extending the life of the light source by turning off the light source outside the scanning range.
第１図は本発明の一実施例であるレーザプリンタの概略
を示す斜視図、第２図は本発明の動作原理を説明するた
めの図、第３図は本発明の制御回路の構成を説明するだ
めのブロック図である。
図面においで、１は半導体レーザ、２はコリメータ、３
はガルバノミラ−９４は結像系、５は光導電体ドラム、
６．７は光検出器、８は制御１１回路。
９は制御部、’１０．１１は記憶部、１２は走査往路。
１３は走査復路、１４は光導電体上の走青路、１５は演
算部、１６は選択部、１７は時間計側部、１８はクロッ
ク発生部を示す。FIG. 1 is a perspective view schematically showing a laser printer that is an embodiment of the present invention, FIG. 2 is a diagram for explaining the operating principle of the present invention, and FIG. 3 is a diagram for explaining the configuration of a control circuit of the present invention. It is a block diagram of a sudame. In the drawing, 1 is a semiconductor laser, 2 is a collimator, and 3 is a semiconductor laser.
is a galvanometer mirror 94 is an imaging system, 5 is a photoconductor drum,
6.7 is a photodetector, 8 is a control 11 circuit. 9 is a control section, '10.11 is a storage section, and 12 is a forward scanning path. Reference numeral 13 indicates a scanning return path, 14 a scanning path on the photoconductor, 15 a calculation section, 16 a selection section, 17 a timer side section, and 18 a clock generation section.
Claims (1)
て決定される走査範囲の両端付近に設けられ各実効走査
の開始及び終了を検出する第１゜第２の光検出手段とを
備え、該菓１．第２の光検出手段によりて検出される実
効走査終了時直後か７ら実効走査開始時直前の間は光源
を消灯することを特徴とする光走査方式。A reciprocating scanning means for performing reciprocating optical scanning, and first and second light detecting means provided near both ends of a scanning range determined by the reciprocating scanning means and detecting the start and end of each effective scan. 1. A light scanning method characterized in that the light source is turned off immediately after the end of the effective scan detected by the second light detection means or between 7 and immediately before the start of the effective scan.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57187202A JPS5975760A (en) | 1982-10-25 | 1982-10-25 | Photoscanning system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57187202A JPS5975760A (en) | 1982-10-25 | 1982-10-25 | Photoscanning system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5975760A true JPS5975760A (en) | 1984-04-28 |
Family
ID=16201876
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57187202A Pending JPS5975760A (en) | 1982-10-25 | 1982-10-25 | Photoscanning system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5975760A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0735512A (en) * | 1993-07-23 | 1995-02-07 | Mitsutoyo Corp | Optical dimension measuring device |
| WO1999059228A3 (en) * | 1998-05-08 | 2000-02-17 | Leica Microsystems | Method for operating a laser light source |
| JP2005349620A (en) * | 2004-06-09 | 2005-12-22 | Seiko Epson Corp | Image forming apparatus and image formation method |
| US7391003B2 (en) | 2005-05-02 | 2008-06-24 | Seiko Epson Corporation | Apparatus and method for adjusting write start position of a scanning light beam of an image forming apparatus |
| US7443414B2 (en) * | 2004-06-09 | 2008-10-28 | Seiko Epson Corporation | Apparatus for and method of forming image using oscillation mirror |
| JP2010000794A (en) * | 2009-07-31 | 2010-01-07 | Seiko Epson Corp | Image formation device and image formation method |
| JP2010006069A (en) * | 2009-07-31 | 2010-01-14 | Seiko Epson Corp | Image forming apparatus and image forming method |
-
1982
- 1982-10-25 JP JP57187202A patent/JPS5975760A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0735512A (en) * | 1993-07-23 | 1995-02-07 | Mitsutoyo Corp | Optical dimension measuring device |
| WO1999059228A3 (en) * | 1998-05-08 | 2000-02-17 | Leica Microsystems | Method for operating a laser light source |
| DE19820575B4 (en) * | 1998-05-08 | 2012-03-29 | Leica Microsystems Cms Gmbh | Method for operating a pulsed laser light source |
| JP2005349620A (en) * | 2004-06-09 | 2005-12-22 | Seiko Epson Corp | Image forming apparatus and image formation method |
| US7443414B2 (en) * | 2004-06-09 | 2008-10-28 | Seiko Epson Corporation | Apparatus for and method of forming image using oscillation mirror |
| US7602410B2 (en) | 2004-06-09 | 2009-10-13 | Seiko Epson Corporation | Apparatus for and method of forming image using oscillation mirror |
| US7626605B2 (en) * | 2004-06-09 | 2009-12-01 | Seiko Epson Corporation | Apparatus for and method of forming image using oscillation mirror |
| JP4501538B2 (en) * | 2004-06-09 | 2010-07-14 | セイコーエプソン株式会社 | Image forming apparatus and image forming method |
| US7391003B2 (en) | 2005-05-02 | 2008-06-24 | Seiko Epson Corporation | Apparatus and method for adjusting write start position of a scanning light beam of an image forming apparatus |
| JP2010000794A (en) * | 2009-07-31 | 2010-01-07 | Seiko Epson Corp | Image formation device and image formation method |
| JP2010006069A (en) * | 2009-07-31 | 2010-01-14 | Seiko Epson Corp | Image forming apparatus and image forming method |
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