JPH0434343A - reflective optical sensor - Google Patents
reflective optical sensorInfo
- Publication number
- JPH0434343A JPH0434343A JP2142120A JP14212090A JPH0434343A JP H0434343 A JPH0434343 A JP H0434343A JP 2142120 A JP2142120 A JP 2142120A JP 14212090 A JP14212090 A JP 14212090A JP H0434343 A JPH0434343 A JP H0434343A
- Authority
- JP
- Japan
- Prior art keywords
- light
- transparent plate
- emitting element
- receiving element
- filter
- 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.)
- Granted
Links
Landscapes
- Investigating Or Analysing Materials By Optical Means (AREA)
- Dry Development In Electrophotography (AREA)
- Control Or Security For Electrophotography (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、反射型光センサに係り、例えば、複写機の感
光体表面上のトナー付着量を検出する反射型光センサに
関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a reflective optical sensor, and for example, to a reflective optical sensor that detects the amount of toner adhering to the surface of a photoreceptor in a copying machine.
上述のような従来の反射型光センサは例えば発光素子お
よび受光素子を有し、これらの素子と複写機の感光体と
の間には防塵フィルタが設けられている。この防塵フィ
ルタにより発光素子内および受光素子内に塵等が進入す
るのを防止している。The conventional reflective optical sensor as described above has, for example, a light emitting element and a light receiving element, and a dustproof filter is provided between these elements and the photoreceptor of the copying machine. This dustproof filter prevents dust and the like from entering into the light emitting element and the light receiving element.
一方、発光素子からの光が防塵フィルタを透過しないで
フィルタ面で反射して受光素子に受米される現象（以下
、クロストークと呼ぶ）が知られており、このクロスト
ークはセンサの検出精度の低下を引き起こす。発光素子
と受光素子の離間距離を大きくすることによりクロスト
ークを防止することができるが、離隔距離を大きくする
とセンサの組み付けに高精度が要求されるといった不具
合が生じる。このため、発光素子および受光素子の離隔
距離を大きくしないでクロストークを防止するものとし
て、例えば実開昭５９−１２１６５９号公報に記載のも
のが知られている。このものは、防塵フィルタに切欠き
ゃ突起を設けてクロストークを防止するようにしている
。切欠きを設けた防塵フィルタは例えば第３図に示され
、突起を設けた防塵フィルタは例えば第４図に示される
。第３．４図において、１．２は防塵フィルタ、３．４
は発光素子、５．６は受光素子である。On the other hand, it is known that light from a light-emitting element does not pass through a dust-proof filter, but is reflected on the filter surface and is received by a light-receiving element (hereinafter referred to as crosstalk). causes a decrease in Although crosstalk can be prevented by increasing the separation distance between the light emitting element and the light receiving element, increasing the separation distance causes problems such as requiring high precision in sensor assembly. For this reason, as a method for preventing crosstalk without increasing the separation distance between the light emitting element and the light receiving element, there is known a method described in, for example, Japanese Utility Model Application Publication No. 59-121659. This filter has a notched protrusion on the dust filter to prevent crosstalk. A dustproof filter provided with notches is shown, for example, in FIG. 3, and a dustproof filter provided with projections is shown, for example, in FIG. 4. In Figure 3.4, 1.2 is a dust filter, 3.4
5.6 is a light emitting element, and 5.6 is a light receiving element.
しかしながら、このような従来の反射型光センサにあっ
ては、防塵フィルタに切欠きゃ突起を設けてクロストー
クを防止していたため、切欠きゃ突起を形成するフィル
タ面で乱反射が発生し、この乱反射光が受光素子に受光
され易く、クロストークの発生を防止するのが困難にな
るといった問題点があった。However, in such conventional reflective optical sensors, crosstalk is prevented by providing notched protrusions on the dustproof filter, so diffuse reflection occurs on the filter surface where the notched protrusions are formed, and this diffusely reflected light There is a problem in that the light is easily received by the light receiving element, making it difficult to prevent crosstalk from occurring.
そこで本発明は、防塵フィルタを互いに延在方向の異な
る第１透明板および第２透明板から構成することにより
、乱反射光の発生を防止して、クロストークの発生を容
易に防止することができる反射型光センサを提供するこ
とを目的としている。Therefore, the present invention makes it possible to prevent the occurrence of diffusely reflected light and easily prevent the occurrence of crosstalk by configuring the dustproof filter from a first transparent plate and a second transparent plate having mutually different extending directions. The purpose is to provide a reflective optical sensor.
本発明による反射型光センサは、上記目的を達成するた
め、光を発して非検出体の表面に照射する発光素子と、
所定の軸線に対し発光素子と軸対称に設けられ、非検出
体の表面から反射した光を受光する受光素子と、透明な
材料からなり、非検出体と発光素子および受光素子との
間に設けられ、発光素子および受光素子を覆う防塵フィ
ルタと、を儂えた反射型光センサにおいて、前記防塵フ
ィルタが前記所定の軸線に対し軸対称に設けられるとと
もに一体的に形成された第１透明板および第２透明板か
ら構成され、第１透明板が発光素子から発せられた光を
透過し、第２透明板が非検出体から反射した光を透過し
、第１透明板および第２透明板の延在方向が互いに異な
ることを特徴とするものである。In order to achieve the above object, the reflective optical sensor according to the present invention includes a light emitting element that emits light and irradiates the surface of a non-detecting object;
A light-receiving element is provided axially symmetrically with the light-emitting element with respect to a predetermined axis and receives light reflected from the surface of the non-detecting object, and a light-receiving element is made of a transparent material and is provided between the non-detecting object and the light-emitting element and the light-receiving element. and a dust-proof filter that covers a light-emitting element and a light-receiving element. The first transparent plate transmits the light emitted from the light emitting element, the second transparent plate transmits the light reflected from the non-detecting object, and the extension of the first transparent plate and the second transparent plate transmits the light emitted from the light emitting element. They are characterized in that they are located in different directions.
以下、本発明を実施例に基づいて具体的に説明する。Hereinafter, the present invention will be specifically explained based on Examples.
第１．２図は本発明に係る反射型光センサの一実施例を
示す図であり、カラー複写機の感光体表面上のトナー付
着量を検出するセンサに適用した例である。FIG. 1.2 is a diagram showing an embodiment of the reflective optical sensor according to the present invention, and is an example applied to a sensor for detecting the amount of toner adhesion on the surface of a photoreceptor of a color copying machine.
まず、構成を説明する。First, the configuration will be explained.
第１図において、１１は発光素子であり、発光素子１１
は光を発して、非検出体としての感光体１２の表面に照
射する。１３は軸線りに対し発光素子１１と軸対称に設
けられた受光素子であり、受光素子１３は感光体１２の
表面から反射した光を受光する。感光体１２と発光素子
１１および受光素子１３との間には透明材料からなる防
塵フィルタ１４が設けられており、防塵フィルタ１４は
発光素子１１および受光素子１３を覆い、発光素子１１
および受光素子１３内に塵等が進入するのを防止してい
る。防塵フィルタ１４は第１透明板１５および第２透明
板１６から構成される。In FIG. 1, 11 is a light emitting element, and the light emitting element 11
emits light and irradiates it onto the surface of the photoreceptor 12, which is a non-detector. Reference numeral 13 denotes a light receiving element provided axially symmetrically with the light emitting element 11 with respect to the axis, and the light receiving element 13 receives light reflected from the surface of the photoreceptor 12. A dustproof filter 14 made of a transparent material is provided between the photoreceptor 12 and the light emitting element 11 and the light receiving element 13. The dustproof filter 14 covers the light emitting element 11 and the light receiving element 13, and
Also, dust and the like are prevented from entering the light receiving element 13. The dust filter 14 is composed of a first transparent plate 15 and a second transparent plate 16.
第１透明板１５および第２透明板１６は軸線りに対し軸
対称に設けられるとともに一体的に形成されている。第
１透明板１５は発光素子１１から発せられた光を透過し
、第２透明板１６は感光体１２から反射した光を透過す
る。また、第１透明板１５および第２透明板１６の延在
方向は互いに異なる。すなわち、第１透明板１５は軸線
りに対し軸対称の一対の平面１７．１８のうちの平面１
７に沿って延在し、第２透明板１６は平面１８に沿って
延在する。１９は発光素子１１、受光素子１３および防
塵フィルタ１４を支持するホルダであり、２０．２１は
テーパ付き絞りである。テーパ付き絞り２０．２１は感
光体１２の正反射光のレベルを低下させないで乱反射光
のレベルを低下させるものである。The first transparent plate 15 and the second transparent plate 16 are provided axially symmetrically with respect to the axis and are integrally formed. The first transparent plate 15 transmits the light emitted from the light emitting element 11, and the second transparent plate 16 transmits the light reflected from the photoreceptor 12. Further, the extending directions of the first transparent plate 15 and the second transparent plate 16 are different from each other. That is, the first transparent plate 15 is placed on plane 1 of a pair of planes 17 and 18 that are axially symmetrical with respect to the axis.
7, and the second transparent plate 16 extends along a plane 18. 19 is a holder that supports the light emitting element 11, the light receiving element 13, and the dustproof filter 14, and 20.21 is a tapered diaphragm. The tapered apertures 20 and 21 reduce the level of diffusely reflected light without reducing the level of specularly reflected light from the photoreceptor 12.
ここで、本実施例の寸法および角度の具体的な数値を示
す。第１図において、Ａ＝１４ ｍｏｂ、 Ｂ＝９．３
ａｍ、 Ｃ，＝８．５ ａ＋ａ＋、 Ｄ ＝
４．５２ ｗｉ、 Ｅ＝ ０．６ｍｍ。Here, specific numerical values of the dimensions and angles of this example will be shown. In Figure 1, A=14 mob, B=9.3
am, C,=8.5 a+a+, D=
4.52 wi, E=0.6mm.
Ｆ＝φ１．５２ ａｓ、Ｇ＝７０’ 、Ｈ＝１３’であ
る。F=φ1.52 as, G=70', H=13'.
上述のような構成によれば、防塵フィルタ１４が一体的
に形成された第１透過板１５および第２透過板１６から
構成され、第１透明板１５および第２透明板１６の延在
方向が異なるので、従来の切欠き等を設けた防塵フィル
タにおける乱反射光の発生を防止することができ、発光
素子１１から発せられた光のうち防塵フィルタ１４を透
過しないでフィルタ面を反射して受光素子１３に受光さ
れる光を非常に少なくすることができる０本実施例の寸
法および角度では、フィルタ面を５回以上反射した微弱
な光だけしか受光素子１６に受光される可能性がないの
で、トナー検出においてはクロストークを無視できるレ
ベルに低減することができ、クロストークの発生を容易
に防止することができる。すなわち、第２図に示すよう
に、本実施例のクロストークの発生レベルは従来の切欠
きゃ突起を防塵フィルタに設けたものに比較すると非常
に小さくすることができる。第２図のグラフの縦軸は、
非検出体を配置しない状態で受光素子が受光する光量を
ｍＶ単位で示したものである。切欠きを設けた従来の防
塵フィルタは第３図に示され、突起を設けた従来の防塵
フィルタは第４図に示される。なお、受光素子１６に受
光されるフィルタ面の反射光の反射回数は既知の幾何光
学により容易に求められ、上述の寸法や角度は必要とな
るクロストークの許容レベルに応じて設定すればよい。According to the above configuration, the dust filter 14 is composed of the first transparent plate 15 and the second transparent plate 16 that are integrally formed, and the extending direction of the first transparent plate 15 and the second transparent plate 16 is Since the difference is different, it is possible to prevent the occurrence of diffusely reflected light in conventional dustproof filters with cutouts, etc., and the light emitted from the light emitting element 11 does not pass through the dustproof filter 14 but is reflected off the filter surface and is transmitted to the light receiving element. With the dimensions and angles of this embodiment, there is a possibility that only weak light that has been reflected on the filter surface five or more times will be received by the light receiving element 16. In toner detection, crosstalk can be reduced to a negligible level, and the occurrence of crosstalk can be easily prevented. That is, as shown in FIG. 2, the crosstalk generation level of this embodiment can be made much smaller than that of a conventional dust filter in which notched protrusions are provided. The vertical axis of the graph in Figure 2 is
The amount of light received by the light receiving element in a state where no non-detecting object is placed is shown in mV units. A conventional dustproof filter provided with notches is shown in FIG. 3, and a conventional dustproof filter provided with projections is shown in FIG. 4. Note that the number of reflections of the light reflected from the filter surface that is received by the light receiving element 16 can be easily determined by known geometrical optics, and the above-mentioned dimensions and angles may be set according to the required crosstalk tolerance level.
また、第１透明板１５および第２透明板１６の当接面を
軸線りに一致させるだけで、防塵フィルタ１４を軸線り
に位置合わせすることができるので、センサの組み付け
を簡単にすることができる。Furthermore, the dust filter 14 can be aligned along the axis simply by aligning the contact surfaces of the first transparent plate 15 and the second transparent plate 16 with the axis, which simplifies sensor assembly. can.
［効果］
本発明によれば、防塵フィルタを一体的に形成された第
１透明板および第２透明板から構成し、第１透明板およ
び第２透明板の延在方向が異なるので、受光素子に受光
される乱反射光の発生を防止することができ、クロスト
ークの発生を容易に防止することができる。[Effects] According to the present invention, since the dust filter is constituted by the first transparent plate and the second transparent plate that are integrally formed, and the extending directions of the first transparent plate and the second transparent plate are different, the light receiving element It is possible to prevent the occurrence of diffusely reflected light that is received by the user, and it is possible to easily prevent the occurrence of crosstalk.
第１．２図は本発明に係る反射型光センサの一実施例を
示す図であり、第１図はその断面図、第２図はそのクロ
ストークの発生量を示す図、第３は従来の反射型光セン
サの概略断面図、第４図は従来の他の反射型光センサの
概略断面図である。
１１・・・・・・発光素子、
１２・−・・・・感光体（非検出体）、１３・−・・・
・受光素子、
１４・・・・・・防塵フィルタ、
１５・・・・・・第１透明板、
１６・・・・・・第２透明板。
第２図
代 理 人 弁理士
有我軍一部
（切欠き）
峡起〕Fig. 1.2 is a diagram showing an embodiment of a reflective optical sensor according to the present invention, Fig. 1 is a cross-sectional view thereof, Fig. 2 is a diagram showing the amount of crosstalk generated, and Fig. 3 is a diagram showing a conventional one. FIG. 4 is a schematic sectional view of another conventional reflective optical sensor. 11... Light emitting element, 12... Photoreceptor (non-detector), 13...
- Light receiving element, 14... Dust filter, 15... First transparent plate, 16... Second transparent plate. Fig. 2 Representative Patent Attorney Arigagun Part (cutout) Kyoki]
Claims (1)
の軸線に対し発光素子と軸対称に設けられ、非検出体の
表面から反射した光を受光する受光素子と、透明な材料
からなり、非検出体と発光素子および受光素子との間に
設けられ、発光素子および受光素子を覆う防塵フィルタ
と、を備えた反射型光センサにおいて、前記防塵フィル
タが前記所定の軸線に対し軸対称に設けられるとともに
一体的に形成された第１透明板および第２透明板から構
成され、第１透明板が発光素子から発せられた光を透過
し、第２透明板が非検出体から反射した光を透過し、第
１透明板および第２透明板の延在方向が互いに異なるこ
とを特徴とする反射型光センサ。A light-emitting element that emits light and irradiates it onto the surface of a non-detecting object, a light-receiving element that is provided axially symmetrically with the light-emitting element with respect to a predetermined axis and receives light reflected from the surface of the non-detecting object, and a transparent material. In the reflective optical sensor, the dust-proof filter is provided between a non-detecting object and the light-emitting element and the light-receiving element, and covers the light-emitting element and the light-receiving element, and the dust-proof filter is axially symmetrical with respect to the predetermined axis. The first transparent plate transmits light emitted from the light emitting element, and the second transparent plate reflects light from a non-detecting object. A reflective optical sensor that transmits light and is characterized in that the first transparent plate and the second transparent plate extend in different directions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2142120A JP2851925B2 (en) | 1990-05-30 | 1990-05-30 | Reflective optical sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2142120A JP2851925B2 (en) | 1990-05-30 | 1990-05-30 | Reflective optical sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0434343A true JPH0434343A (en) | 1992-02-05 |
| JP2851925B2 JP2851925B2 (en) | 1999-01-27 |
Family
ID=15307869
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2142120A Expired - Lifetime JP2851925B2 (en) | 1990-05-30 | 1990-05-30 | Reflective optical sensor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2851925B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11265112A (en) * | 1998-03-17 | 1999-09-28 | Minolta Co Ltd | Image forming device |
| JP2008249714A (en) * | 2008-04-28 | 2008-10-16 | Ricoh Co Ltd | Optical sensor and image forming apparatus |
| JP2008261864A (en) * | 2008-04-28 | 2008-10-30 | Ricoh Co Ltd | Optical sensor and image forming apparatus |
| JP2011133483A (en) * | 2011-01-25 | 2011-07-07 | Ricoh Co Ltd | Photosensor and image forming apparatus |
-
1990
- 1990-05-30 JP JP2142120A patent/JP2851925B2/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11265112A (en) * | 1998-03-17 | 1999-09-28 | Minolta Co Ltd | Image forming device |
| JP2008249714A (en) * | 2008-04-28 | 2008-10-16 | Ricoh Co Ltd | Optical sensor and image forming apparatus |
| JP2008261864A (en) * | 2008-04-28 | 2008-10-30 | Ricoh Co Ltd | Optical sensor and image forming apparatus |
| JP2011133483A (en) * | 2011-01-25 | 2011-07-07 | Ricoh Co Ltd | Photosensor and image forming apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2851925B2 (en) | 1999-01-27 |
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