JP6761766B2 - Toner adhesion sensor and its manufacturing method - Google Patents

Toner adhesion sensor and its manufacturing method Download PDF

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JP6761766B2
JP6761766B2 JP2017030844A JP2017030844A JP6761766B2 JP 6761766 B2 JP6761766 B2 JP 6761766B2 JP 2017030844 A JP2017030844 A JP 2017030844A JP 2017030844 A JP2017030844 A JP 2017030844A JP 6761766 B2 JP6761766 B2 JP 6761766B2
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一真 本田
一真 本田
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Nichicon Capacitor Ltd
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Description

本発明は、トナー付着量センサおよびその製造方法に関する。 The present invention relates to a toner adhesion amount sensor and a method for manufacturing the same.

トナー付着量の測定原理は、トナーが付着した測定対象物にＬＥＤからの照射光を照射し、照射光に対する測定対象物からの反射光を偏光フィルタでＰ波成分とＳ波成分に分解して、２つのフォトダイオードでＰ波成分、Ｓ波成分を受光する。フォトダイオードは、受光量に応じた出力信号を出力し、これらの出力信号に基づいてトナー付着量を測定する（例えば、特許文献１参照）。 The principle of measuring the amount of toner adhering is to irradiate the measurement object to which toner adheres with the irradiation light from the LED, and decompose the reflected light from the measurement object with respect to the irradiation light into P-wave components and S-wave components with a polarizing filter. Two photodiodes receive P-wave and S-wave components. The photodiode outputs output signals according to the amount of received light, and measures the amount of toner adhered based on these output signals (see, for example, Patent Document 1).

上記測定原理に基づいてトナー付着量を測定するためのセンサとしては、ＬＥＤと２つのフォトダイオードとを１つの基板上に実装した反射型のトナー付着量センサがある。このトナー付着量センサは、複写機やプリンターで使用され、常にトナーの粉や紙粉等にさらされた状態になる。複写機やプリンターによっては、専用のカバーによりトナー付着量センサをトナーの粉や紙粉等から保護しているが、完全には防ぎきれず、トナー付着量センサにトナーの粉や紙粉等の汚れが付着することがある。 As a sensor for measuring the toner adhesion amount based on the above measurement principle, there is a reflection type toner adhesion amount sensor in which an LED and two photodiodes are mounted on one substrate. This toner adhesion amount sensor is used in copiers and printers, and is always exposed to toner powder, paper dust, and the like. Depending on the copier or printer, the toner adhesion amount sensor is protected from toner dust and paper dust by a special cover, but it cannot be completely prevented, and the toner adhesion amount sensor is covered with toner powder and paper dust. Dirt may adhere.

トナー付着量センサのレンズに汚れが付着すると、その汚れによって照射光の一部がレンズ面で反射する内面反射が大幅に増加してしまう。そして、大幅に増加した内面反射光がフォトダイオードに入射すると、フォトダイオードの出力信号は当該内面反射光の影響を受けて大きく変動する。その結果、測定対象物のトナー付着量を正確に測定することができなくなるという問題が発生する。 When dirt adheres to the lens of the toner adhesion amount sensor, the internal reflection in which a part of the irradiation light is reflected on the lens surface due to the dirt increases significantly. Then, when the significantly increased internal reflected light is incident on the photodiode, the output signal of the photodiode is greatly affected by the internally reflected light and fluctuates greatly. As a result, there arises a problem that the amount of toner adhered to the object to be measured cannot be accurately measured.

上記の問題を解消するためには、ＬＥＤと２つのフォトダイオードとの間に遮光壁を設けることが有効である。図９に、ＬＥＤ３と２つのフォトダイオード４、５との間に遮光壁６ｗを設けたトナー付着量センサ１Ｃを示す。 In order to solve the above problem, it is effective to provide a light-shielding wall between the LED and the two photodiodes. FIG. 9 shows a toner adhesion amount sensor 1C provided with a light-shielding wall 6w between the LED 3 and the two photodiodes 4 and 5.

トナー付着量センサ１Ｃは、基板２と、基板２の上面に設けられたＬＥＤ３およびフォトダイオード４、５と、樹脂で形成されたレンズ部材７と、遮光壁６ｗを有するホルダ６と、を備える。レンズ部材７は、金型を用いた樹脂射出成形においてゲート位置（ゲート部２８）から樹脂を金型内部に注入することによって形成される。 The toner adhesion amount sensor 1C includes a substrate 2, LEDs 3 and photodiodes 4 and 5 provided on the upper surface of the substrate 2, a lens member 7 made of resin, and a holder 6 having a light-shielding wall 6w. The lens member 7 is formed by injecting resin into the mold from the gate position (gate portion 28) in resin injection molding using the mold.

遮光壁６ｗは、レンズ部材７の上面まで延びており、レンズ部材７を伝搬する迷光（内面反射光）がフォトダイオード４、５に入射するのを抑制する。したがって、トナー付着量センサ１Ｃでは、フォトダイオード４、５が内面反射光の影響を受けにくくなるので、内面反射光に起因した上記問題が解消される。 The light-shielding wall 6w extends to the upper surface of the lens member 7 and suppresses stray light (internally reflected light) propagating through the lens member 7 from entering the photodiodes 4 and 5. Therefore, in the toner adhesion amount sensor 1C, the photodiodes 4 and 5 are less likely to be affected by the internally reflected light, so that the above-mentioned problem caused by the internally reflected light is solved.

特開２００２−３１０９０１号公報JP-A-2002-310901

トナー付着量センサ１Ｃのレンズ部材７は、上記のとおり、ゲート位置からの樹脂注入によって形成される（ゲート位置にはゲート部２８が形成される）。レンズ部材７のゲート位置は、図９に示すとおり、ホルダ６上にレンズ部材７を搭載した状態で、ホルダ６のフォトダイオード４、５側の端部の上方に位置する。また、レンズ部材７には、ＬＥＤ３とフォトダイオード４、５との間に遮光壁６ｗを設けるための隙間部を形成する必要がある。この隙間部があるため、トナー付着量センサ１Ｃでは、レンズ部材７の形成工程において、フォトダイオード４、５側からＬＥＤ３側への樹脂の回り込み不足が懸念される。 As described above, the lens member 7 of the toner adhesion amount sensor 1C is formed by injecting resin from the gate position (the gate portion 28 is formed at the gate position). As shown in FIG. 9, the gate position of the lens member 7 is located above the end portion of the holder 6 on the photodiodes 4 and 5 side with the lens member 7 mounted on the holder 6. Further, it is necessary to form a gap portion in the lens member 7 for providing a light-shielding wall 6w between the LED 3 and the photodiodes 4 and 5. Due to this gap, in the toner adhesion amount sensor 1C, there is a concern that the resin does not wrap around from the photodiodes 4 and 5 to the LED 3 side in the process of forming the lens member 7.

本発明は上記事情に鑑みてなされたものであって、その課題とするところは、レンズ部材における樹脂の回り込み不足に起因する不良を低減することが可能なトナー付着量センサおよびその製造方法を提供することにある。 The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a toner adhesion amount sensor capable of reducing defects caused by insufficient wraparound of resin in a lens member and a method for manufacturing the same. To do.

上記課題を解決するために、本発明に係るトナー付着量センサの製造方法は、
測定対象物に照射光を照射し、前記照射光に対する前記測定対象物からの反射光を受光するトナー付着量センサの製造方法であって、
集合基板を構成する複数の基板の上面に、前記照射光を照射する発光部と、前記反射光を受光する受光部と、前記発光部と前記受光部との間に位置する遮光壁と、がそれぞれ形成されたセンサ集合体を作製するセンサ集合体作製工程と、
前記基板の上面に搭載されたときに前記発光部の上方に位置する発光レンズ部と、前記基板の上面に搭載されたときに前記受光部の上方に位置する受光レンズ部と、前記遮光壁が収まる隙間部と、を有するレンズ部材を、金型を用いた樹脂射出成形によって形成するレンズ部材形成工程と、
前記センサ集合体の上面に複数の前記レンズ部材を搭載した状態で、ダイサーによるダイシング加工によって、前記センサ集合体から複数のトナー付着量センサを作製するダインシング工程と、
を含み、
前記レンズ部材形成工程では、
前記レンズ部材の側面で、かつ、前記隙間部を挟んで一方側の第１領域と他方側の第２領域とにまたがる位置を、前記金型への樹脂注入を行うゲート位置とする
ことを特徴とする。 In order to solve the above problems, the method for manufacturing the toner adhesion amount sensor according to the present invention is
A method for manufacturing a toner adhesion amount sensor that irradiates an object to be measured with irradiation light and receives the reflected light from the object to be measured with respect to the irradiation light.
On the upper surface of a plurality of substrates constituting the collective substrate, a light emitting portion that irradiates the irradiation light, a light receiving portion that receives the reflected light, and a light-shielding wall located between the light emitting portion and the light receiving portion are formed. A sensor assembly manufacturing process for manufacturing each formed sensor assembly, and a sensor assembly manufacturing process.
A light emitting lens portion located above the light emitting portion when mounted on the upper surface of the substrate, a light receiving lens portion located above the light receiving portion when mounted on the upper surface of the substrate, and the light shielding wall A lens member forming step of forming a lens member having a gap to be accommodated by resin injection molding using a mold.
A dicing step of producing a plurality of toner adhesion amount sensors from the sensor assembly by dicing with a dicer while the plurality of lens members are mounted on the upper surface of the sensor assembly.
Including
In the lens member forming step,
The gate position on the side surface of the lens member and straddling the first region on one side and the second region on the other side across the gap is set as the gate position for injecting the resin into the mold. And.

また、上記課題を解決するために、本発明に係るトナー付着量センサは、
測定対象物に照射光を照射し、前記照射光に対する前記測定対象物からの反射光を受光するトナー付着量センサであって、
基板と、
前記基板の上面に設けられた、前記照射光を照射する発光部と、
前記基板の上面に設けられた、前記反射光を受光する受光部と、
前記発光部の上方に位置する発光レンズ部および前記受光部の上方に位置する受光レンズ部を下面側に有するレンズ部材と、
前記レンズ部材を前記発光部側の第１領域と前記受光部側の第２領域とに二分し、前記レンズ部材を前記第１領域から前記第２領域に向かって伝搬する迷光を遮光する遮光壁と、を備え、
前記レンズ部材は、樹脂で形成されるとともに、当該レンズ部材の側面でかつ前記第１領域と前記第２領域とにまたがった位置に、当該レンズ部材の側面から突出したゲート部を有する
ことを特徴とする。 Further, in order to solve the above problems, the toner adhesion amount sensor according to the present invention is used.
A toner adhesion amount sensor that irradiates an object to be measured with irradiation light and receives the reflected light from the object to be measured with respect to the irradiation light.
With the board
A light emitting unit that irradiates the irradiation light provided on the upper surface of the substrate,
A light receiving portion provided on the upper surface of the substrate and receiving the reflected light,
A lens member having a light emitting lens portion located above the light emitting portion and a light receiving lens portion located above the light receiving portion on the lower surface side.
A light-shielding wall that divides the lens member into a first region on the light emitting portion side and a second region on the light receiving portion side, and shields the lens member from stray light propagating from the first region toward the second region. And with
The lens member is made of resin and has a gate portion protruding from the side surface of the lens member at a position on the side surface of the lens member and straddling the first region and the second region. And.

これらの構成（トナー付着量センサおよびその製造方法）によれば、レンズ部材の側面で、かつ遮光壁が収まる隙間部を挟んで一方側（発光部側）の第１領域と他方側（受光部側）の第２領域とにまたがる位置を金型への樹脂注入を行うゲート位置とすることで、レンズ部材の側面でかつ第１領域と第２領域とにまたがって当該レンズ部材の側面から突出したゲート部が形成される。このため、レンズ部材の形成工程において、樹脂を第１領域と第２領域とに直接注入することができる。したがって、レンズ部材を形成するに際し、樹脂の回り込み不足を解消することができる。 According to these configurations (toner adhesion amount sensor and its manufacturing method), the first region on one side (light emitting portion side) and the other side (light receiving portion) on the side surface of the lens member and across the gap portion in which the light-shielding wall is accommodated. By setting the position straddling the second region on the side) as the gate position for injecting resin into the mold, the lens member protrudes from the side surface of the lens member and also straddles the first region and the second region. The gate portion is formed. Therefore, in the process of forming the lens member, the resin can be directly injected into the first region and the second region. Therefore, when forming the lens member, it is possible to eliminate the insufficient wraparound of the resin.

上記トナー付着量センサにおいて、
前記ゲート部は、前記レンズ部材の側面に向かって末広がり状に形成されている
ことが好ましい。 In the toner adhesion amount sensor,
The gate portion is preferably formed so as to spread toward the side surface of the lens member.

上記トナー付着量センサにおいて、
前記ゲート部は、前記レンズ部材の側面から最も離れた表面が粗面化されている
ことが好ましい。 In the toner adhesion amount sensor,
It is preferable that the surface of the gate portion farthest from the side surface of the lens member is roughened.

この構成によれば、粗面化された表面で内面反射光を分散させることができるので、受光部が内面反射光の影響を受けにくくなる。 According to this configuration, the internally reflected light can be dispersed on the roughened surface, so that the light receiving portion is less affected by the internally reflected light.

ゲート部の表面（レンズ部材の側面から最も離れた表面）を粗面化する観点から、上記トナー付着量センサの製造方法は、
前記レンズ部材形成工程において、前記ゲート位置に、前記レンズ部材の側面から突出したゲート部を前記樹脂注入によって形成し、
前記ダインシング工程において、前記ダイシング加工時に、前記ダイサーによって前記ゲート部表面の粗面化を行う
ことが好ましい。 From the viewpoint of roughening the surface of the gate portion (the surface farthest from the side surface of the lens member), the method for manufacturing the toner adhesion amount sensor is as follows.
In the lens member forming step, a gate portion protruding from the side surface of the lens member is formed at the gate position by the resin injection.
In the dicing step, it is preferable that the surface of the gate portion is roughened by the dicing during the dicing process.

この構成によれば、粗面化されたゲート部表面で内面反射光を分散させることができるので、受光部が内面反射光の影響を受けにくくなるトナー付着量センサを製造することができる。また、この構成によれば、ダイシング加工でセンサ集合体のカットとゲート部表面の粗面化を同時に行うので、製造工程を簡素化してコスト低減を図ることができる。 According to this configuration, since the inner surface reflected light can be dispersed on the surface of the roughened gate portion, it is possible to manufacture a toner adhesion amount sensor in which the light receiving portion is less affected by the inner surface reflected light. Further, according to this configuration, since the sensor assembly is cut and the surface of the gate portion is roughened at the same time by dicing, the manufacturing process can be simplified and the cost can be reduced.

本発明によれば、レンズ部材における樹脂の回り込み不足に起因する不良を低減することが可能なトナー付着量センサおよびその製造方法を提供することができる。 According to the present invention, it is possible to provide a toner adhesion amount sensor capable of reducing defects caused by insufficient wraparound of resin in a lens member and a method for manufacturing the same.

第１実施形態に係るトナー付着量センサを示す図である。It is a figure which shows the toner adhesion amount sensor which concerns on 1st Embodiment. 第１実施形態に係るトナー付着量センサであって、（Ａ）は平面図、（Ｂ）は側面図である。The toner adhesion amount sensor according to the first embodiment, (A) is a plan view, and (B) is a side view. 第１実施形態に係るトナー付着量センサの製造方法であって、（Ａ）は第１工程を示す図、（Ｂ）は第２工程を示す図である。It is the manufacturing method of the toner adhesion amount sensor which concerns on 1st Embodiment, (A) is a figure which shows the 1st process, (B) is a figure which shows the 2nd process. 第１実施形態に係るトナー付着量センサの製造方法であって、（Ａ）は第３工程を示す図、（Ｂ）は第４工程を示す図である。It is the manufacturing method of the toner adhesion amount sensor which concerns on 1st Embodiment, (A) is a figure which shows the 3rd process, (B) is a figure which shows the 4th process. 第２実施形態に係るトナー付着量センサであって、（Ａ）は平面図、（Ｂ）は側面図である。The toner adhesion amount sensor according to the second embodiment, (A) is a plan view, and (B) is a side view. （Ａ）は第１実施形態における内面反射光を示す図である。（Ｂ）は第２実施形態における内面反射光を示す図である。(A) is a figure which shows the internally reflected light in 1st Embodiment. (B) is a figure which shows the internally reflected light in the 2nd Embodiment. 第２実施形態に係るトナー付着量センサの製造方法であって、（Ａ）は第３工程を示す図、（Ｂ）は第４工程を示す図である。It is the manufacturing method of the toner adhesion amount sensor which concerns on 2nd Embodiment, (A) is a figure which shows the 3rd process, (B) is a figure which shows the 4th process. 第２実施形態における第４工程を説明するための図である。It is a figure for demonstrating the 4th process in 2nd Embodiment. 従来のトナー付着量センサであって、（Ａ）は平面図、（Ｂ）は側面図である。In the conventional toner adhesion amount sensor, (A) is a plan view and (B) is a side view.

以下、添付図面を参照して、本発明に係るトナー付着量センサおよびその製造方法の実施形態について説明する。 Hereinafter, embodiments of the toner adhesion amount sensor and the manufacturing method thereof according to the present invention will be described with reference to the accompanying drawings.

［第１実施形態］
（トナー付着量センサ）
図１に、本発明の第１実施形態に係るトナー付着量センサ１Ａを示す。トナー付着量センサ１Ａは、基板２と、ＬＥＤ３およびフォトダイオード４、５と、遮光壁６ｗが形成されたホルダ６と、レンズ部材７と、を備える。 [First Embodiment]
(Toner adhesion sensor)
FIG. 1 shows a toner adhesion amount sensor 1A according to the first embodiment of the present invention. The toner adhesion amount sensor 1A includes a substrate 2, LEDs 3, photodiodes 4 and 5, a holder 6 on which a light-shielding wall 6w is formed, and a lens member 7.

基板２は、例えば、プリント配線板である。基板２の上面には、ＬＥＤ３およびフォトダイオード４、５が設けられている。ＬＥＤ３は、基板２の一方側（例えば、遮光壁６ｗの左側）に設けられ、フォトダイオード４、５は、基板２の他方側（例えば、遮光壁６ｗの右側）に設けられている。 The substrate 2 is, for example, a printed wiring board. An LED 3 and photodiodes 4 and 5 are provided on the upper surface of the substrate 2. The LED 3 is provided on one side of the substrate 2 (for example, the left side of the light shielding wall 6w), and the photodiodes 4 and 5 are provided on the other side of the substrate 2 (for example, the right side of the light shielding wall 6w).

ＬＥＤ３は、本発明の「発光部」に相当し、照射光として可視光または赤外光を照射する。ＬＥＤ３の上方には、照射光のＰ波成分のみが測定対象物１００（例えば、感光体）に照射されるように、発光側Ｐ波透過用偏光フィルタが設けられていてもよい。また、ＬＥＤ３の照射光量をフィードバック制御するためのフォトダイオードを、ＬＥＤ３の近傍に設けてもよい。 The LED 3 corresponds to the "light emitting unit" of the present invention and irradiates visible light or infrared light as irradiation light. A polarizing filter for transmitting P-waves on the light emitting side may be provided above the LED3 so that only the P-wave component of the irradiation light is irradiated to the measurement object 100 (for example, the photoconductor). Further, a photodiode for feedback control of the irradiation light amount of the LED 3 may be provided in the vicinity of the LED 3.

フォトダイオード４、５は、本発明の「受光部」に相当し、一方が反射光のＰ波成分を受光し、他方が反射光のＳ波成分を受光する。本実施形態では、フォトダイオード４が、反射光のＰ波成分を受光し、Ｐ波成分の受光量に応じた第１出力信号を出力する一方、フォトダイオード５が、反射光のＳ波成分を受光し、Ｓ波成分の受光量に応じた第２出力信号を出力する。 The photodiodes 4 and 5 correspond to the "light receiving portion" of the present invention, one of which receives the P wave component of the reflected light and the other of which receives the S wave component of the reflected light. In the present embodiment, the photodiode 4 receives the P-wave component of the reflected light and outputs the first output signal corresponding to the received amount of the P-wave component, while the photodiode 5 receives the S-wave component of the reflected light. It receives light and outputs a second output signal according to the amount of light received by the S-wave component.

フォトダイオード４の上方には、反射光のうち測定対象物１００に対して垂直な方向成分であるＰ波成分を透過させ、Ｐ波成分に垂直な方向成分であるＳ波成分をカットする受光側Ｐ波透過用偏光フィルタが設けられていてもよい。一方、フォトダイオード５の上方には、反射光のうちＳ波成分を透過させ、Ｐ波成分をカットする受光側Ｓ波透過用偏光フィルタが設けられていてもよい。 Above the photodiode 4, the light receiving side that transmits the P-wave component, which is a directional component perpendicular to the object to be measured 100, of the reflected light, and cuts the S-wave component, which is a directional component perpendicular to the P-wave component. A polarizing filter for P-wave transmission may be provided. On the other hand, a polarizing filter for transmitting S-wave on the light receiving side may be provided above the photodiode 5 to transmit the S-wave component of the reflected light and cut the P-wave component.

トナー付着量センサ１Ａは、フォトダイオード４、５の出力信号に対して演算処理を行う演算回路（図示略）を備えており、当該演算回路が、フォトダイオード４の第１出力信号とフォトダイオード５の第２出力信号との差分に基づいて、測定対象物１００におけるトナーの付着量を測定する。演算回路は、例えば、基板２上のフォトダイオード４、５の近傍に配置することができる。 The toner adhesion amount sensor 1A includes an arithmetic circuit (not shown) that performs arithmetic processing on the output signals of the photodiodes 4 and 5, and the arithmetic circuits are the first output signal of the photodiode 4 and the photodiode 5. The amount of toner adhered to the measurement object 100 is measured based on the difference from the second output signal of. The arithmetic circuit can be arranged, for example, in the vicinity of the photodiodes 4 and 5 on the substrate 2.

測定対象物１００のトナーが付着していない部分において反射した反射光のＰ波成分をＰ１、Ｓ波成分をＳ１、測定対象物１００のトナーが付着した部分において反射した反射光のＰ波成分をＰ２、Ｓ波成分をＳ２とした場合、フォトダイオード４は第１出力信号（Ｐ１＋Ｐ２）を出力し、フォトダイオード５は第２出力信号（Ｓ１＋Ｓ２）を出力する。このとき演算回路は、第１出力信号（Ｐ１＋Ｐ２）および第２出力信号（Ｓ１＋Ｓ２）をＫ倍に増幅し、第１出力信号Ｋ（Ｐ１＋Ｐ２）と第２出力信号Ｋ（Ｓ１＋Ｓ２）との差分Ｋ｛（Ｐ１＋Ｐ２）−（Ｓ１＋Ｓ２）｝を算出し、当該差分に応じたアナログ電圧を出力する。 The P-wave component of the reflected light reflected in the portion of the measurement object 100 to which the toner is not attached is P1, the S-wave component is S1, and the P-wave component of the reflected light reflected in the portion of the measurement object 100 to which the toner is attached is P1. When the P2 and S wave components are S2, the photodiode 4 outputs the first output signal (P1 + P2), and the photodiode 5 outputs the second output signal (S1 + S2). At this time, the arithmetic circuit amplifies the first output signal (P1 + P2) and the second output signal (S1 + S2) K times, and the difference K between the first output signal K (P1 + P2) and the second output signal K (S1 + S2) { (P1 + P2)-(S1 + S2)} is calculated, and the analog voltage corresponding to the difference is output.

ここで、トナーが付着した部分における反射光は、乱反射となり、Ｐ２≒Ｓ２の関係が成り立つ一方、トナーが付着していない部分における反射光は、Ｐ波が支配的となり、Ｐ１＞Ｓ１の関係が成り立つ。このため、上記差分は、Ｋ（Ｐ１−Ｓ１）と近似することができる。すなわち、演算回路は、トナー付着量の測定として、反射光にＰ波成分の偏りがどれだけあるかを示すＫ（Ｐ１−Ｓ１）に応じたアナログ電圧を出力してもよい。測定対象物１００におけるトナー付着量が少ないと、Ｋ（Ｐ１−Ｓ１）は大きくなり、アナログ電圧は高くなる一方、測定対象物１００におけるトナー付着量が多いと、Ｋ（Ｐ１−Ｓ１）は小さくなり、アナログ電圧は低くなる。 Here, the reflected light in the portion to which the toner is attached becomes diffusely reflected, and the relationship of P2≈S2 is established, while the reflected light in the portion to which the toner is not adhered is dominated by the P wave, and the relationship of P1> S1 is established. It holds. Therefore, the above difference can be approximated to K (P1-S1). That is, the arithmetic circuit may output an analog voltage corresponding to K (P1-S1) indicating how much the P wave component is biased in the reflected light as a measurement of the amount of toner adhered. When the amount of toner adhered to the object to be measured 100 is small, K (P1-S1) becomes large and the analog voltage becomes high, while when the amount of toner adhered to the object to be measured 100 is large, K (P1-S1) becomes small. , The analog voltage becomes low.

ホルダ６は、ＬＥＤ３の照射光に対して不透明な樹脂で構成されている。ホルダ６は、上下方向に貫通する第１貫通部および第２貫通部を有する。ホルダ６は、第１貫通部内にＬＥＤ３が配置され、第２貫通部内にフォトダイオード４、５が配置されるように、基板２上に搭載されている。また、ホルダ６は、第１貫通部と第２貫通部との間において遮光壁６ｗを有する。遮光壁６ｗは、レンズ部材７の上面まで延びており、レンズ部材７を伝搬するＬＥＤ３の迷光（内面反射光）がフォトダイオード４、５に入射するのを抑制する。 The holder 6 is made of a resin that is opaque to the irradiation light of the LED 3. The holder 6 has a first penetrating portion and a second penetrating portion penetrating in the vertical direction. The holder 6 is mounted on the substrate 2 so that the LED 3 is arranged in the first penetrating portion and the photodiodes 4 and 5 are arranged in the second penetrating portion. Further, the holder 6 has a light-shielding wall 6w between the first penetrating portion and the second penetrating portion. The light-shielding wall 6w extends to the upper surface of the lens member 7 and suppresses stray light (internally reflected light) of the LED 3 propagating through the lens member 7 from entering the photodiodes 4 and 5.

レンズ部材７は、ＬＥＤ３の照射光に対して透明な樹脂で構成されている。レンズ部材７は、ＬＥＤ３の上方に位置する発光レンズ部７ａおよびフォトダイオード４、５の上方に位置する受光レンズ部７ｂを下面側に有する。レンズ部材７は、遮光壁６ｗが収まる隙間部を有するとともに、図２に示すとおり、一の側面７ｓでかつ隙間部を挟んで一方側の第１領域と他方側の第２領域とにまたがる位置（ゲート位置）に、側面７ｓから突出したゲート部８を有する。 The lens member 7 is made of a resin that is transparent to the irradiation light of the LED 3. The lens member 7 has a light emitting lens portion 7a located above the LED 3 and a light receiving lens portion 7b located above the photodiodes 4 and 5 on the lower surface side. The lens member 7 has a gap portion in which the light-shielding wall 6w is accommodated, and as shown in FIG. 2, a position straddling the first region on one side and the second region on the other side with the gap portion sandwiched between the side surfaces 7s. (Gate position) has a gate portion 8 protruding from the side surface 7s.

ゲート部８は、レンズ部材７の外表面（後述する表面８ｓ）から側面７ｓに向かって末広がり状に形成されている。言い換えれば、ゲート部８は、側面７ｓに近づくほど断面積が大きくなる形状に形成されている。 The gate portion 8 is formed in a divergent shape from the outer surface (surface 8s described later) of the lens member 7 toward the side surface 7s. In other words, the gate portion 8 is formed in a shape in which the cross-sectional area increases as it approaches the side surface 7s.

レンズ部材７は、金型を用いた樹脂射出成形において、ゲート位置からの樹脂注入によって形成される。本実施形態では、上記のとおり、ゲート位置が隙間部を挟んで第１領域（ＬＥＤ３側の領域）と第２領域（フォトダイオード４、５側の領域）とにまたがっているので、レンズ部材の形成工程において、樹脂を第１領域と第２領域に直接注入することができる。その結果、レンズ部材形成工程における樹脂の回り込み不足が解消される。 The lens member 7 is formed by injecting resin from a gate position in resin injection molding using a mold. In the present embodiment, as described above, since the gate position straddles the first region (region on the LED3 side) and the second region (regions on the photodiodes 4 and 5 side) with the gap portion interposed therebetween, the lens member In the forming step, the resin can be directly injected into the first region and the second region. As a result, the insufficient wraparound of the resin in the lens member forming process is eliminated.

したがって、本実施形態に係るトナー付着量センサ１Ａによれば、レンズ部材７における樹脂の回り込み不足による不良を低減することができる。 Therefore, according to the toner adhesion amount sensor 1A according to the present embodiment, it is possible to reduce defects due to insufficient wraparound of the resin in the lens member 7.

（トナー付着量センサの製造方法）
次に、本実施形態に係るトナー付着量センサ１Ａの製造方法について説明する。本実施形態に係る製造方法は、図３（Ａ）に示す第１工程と、図３（Ｂ）に示す第２工程と、レンズ部材形成工程と、図４（Ａ）に示す第３工程と、図４（Ｂ）に示す第４工程と、を含む。 (Manufacturing method of toner adhesion amount sensor)
Next, a method of manufacturing the toner adhesion amount sensor 1A according to the present embodiment will be described. The manufacturing method according to the present embodiment includes a first step shown in FIG. 3A, a second step shown in FIG. 3B, a lens member forming step, and a third step shown in FIG. 4A. , And the fourth step shown in FIG. 4 (B).

図３（Ａ）に示す第１工程では、集合基板２０を構成する複数（本実施形態では、１０個）の基板２の上面に、ＬＥＤ３、フォトダイオード４、５、演算回路等の部品が搭載される。なお、図３（Ａ）では、基板２の上面に搭載された部品を省略している。 In the first step shown in FIG. 3A, components such as LEDs 3, photodiodes 4, 5, and arithmetic circuits are mounted on the upper surfaces of a plurality of (10 in this embodiment) substrates 2 constituting the assembly substrate 20. Will be done. In FIG. 3A, the components mounted on the upper surface of the substrate 2 are omitted.

図３（Ｂ）に示す第２工程では、部品が搭載された複数の基板２の上面に、ホルダ集合体６０を構成する複数（本実施形態では、１０個）のホルダ６が搭載される。これにより、本発明の「センサ集合体」が作製される。また、第１工程および第２工程が、本発明の「センサ集合体作製工程」に相当する。 In the second step shown in FIG. 3B, a plurality of (10 in this embodiment) holders 6 constituting the holder assembly 60 are mounted on the upper surfaces of the plurality of substrates 2 on which the components are mounted. As a result, the "sensor assembly" of the present invention is produced. Further, the first step and the second step correspond to the "sensor assembly manufacturing step" of the present invention.

レンズ部材形成工程では、金型を用いた樹脂射出成形によってレンズ部材７が形成される。レンズ部材７は、発光レンズ部７ａ、受光レンズ部７ｂ、およびホルダ６の遮光壁６ｗが収まる隙間部を有する。レンズ部材形成工程では、レンズ部材７の側面７ｓでかつ隙間部を挟んで一方側の第１領域（ＬＥＤ３側の領域）と他方側の第２領域（フォトダイオード４、５側の領域）とにまたがる位置が、金型への樹脂注入を行うゲート位置となる。 In the lens member forming step, the lens member 7 is formed by resin injection molding using a mold. The lens member 7 has a gap portion in which the light emitting lens portion 7a, the light receiving lens portion 7b, and the light shielding wall 6w of the holder 6 are accommodated. In the lens member forming step, the lens member 7 is divided into a first region on one side (region on the LED3 side) and a second region on the other side (regions on the photodiodes 4 and 5 side) on the side surface 7s of the lens member 7 with a gap in between. The straddling position is the gate position for injecting resin into the mold.

これにより、樹脂が第１領域と第２領域とに直接注入されるので、樹脂の回り込み不足が解消される。その結果、レンズ部材７における、樹脂の回り込み不足による不良が低減される。レンズ部材形成工程では、レンズ部材７のゲート位置にゲート部８が形成されるが、本実施形態に係る製造方法では、次の第３工程の前に、ゲート部８の少なくとも一部を除去してもよい。 As a result, the resin is directly injected into the first region and the second region, so that the insufficient wraparound of the resin is eliminated. As a result, defects in the lens member 7 due to insufficient wraparound of the resin are reduced. In the lens member forming step, the gate portion 8 is formed at the gate position of the lens member 7, but in the manufacturing method according to the present embodiment, at least a part of the gate portion 8 is removed before the next third step. You may.

図４（Ａ）に示す第３工程では、第２工程で作製したセンサ集合体の上面に、レンズ部材形成工程で作製した複数（本実施形態では、１０個）のレンズ部材７が搭載される。 In the third step shown in FIG. 4A, a plurality of (10 in this embodiment) lens members 7 manufactured in the lens member forming step are mounted on the upper surface of the sensor assembly manufactured in the second step. ..

図４（Ｂ）に示す第４工程では、分割加工によって、第３工程においてレンズ部材７が搭載されたセンサ集合体から、複数（本実施形態では、１０個）のトナー付着量センサ１Ａが作製される。なお、センサ集合体から複数のトナー付着量センサ１Ａへの分割方法は特に限定されるものではないが、好ましくはラインＬ２のＶカット溝に沿って折り加工が行われた後に、ラインＬ１に沿ってダイサーによるダイシング加工が行われる。第３工程および第４工程が、本発明の「ダイシング工程」に相当する。 In the fourth step shown in FIG. 4B, a plurality of (10 in this embodiment) toner adhesion amount sensors 1A are produced from the sensor assembly on which the lens member 7 is mounted in the third step by the dividing process. Will be done. The method of dividing the sensor assembly into the plurality of toner adhesion amount sensors 1A is not particularly limited, but is preferably along the line L1 after the folding process is performed along the V-cut groove of the line L2. Dicing is performed by a dicer. The third step and the fourth step correspond to the "dicing step" of the present invention.

［第２実施形態］
（トナー付着量センサ）
図５に、本発明の第２実施形態に係るトナー付着量センサ１Ｂを示す。トナー付着量センサ１Ｂは、レンズ部材７にゲート部１８が形成されている点において、第１実施形態に係るトナー付着量センサ１Ａと相違し、その他の点において、トナー付着量センサ１Ａと共通する。 [Second Embodiment]
(Toner adhesion sensor)
FIG. 5 shows the toner adhesion amount sensor 1B according to the second embodiment of the present invention. The toner adhesion amount sensor 1B is different from the toner adhesion amount sensor 1A according to the first embodiment in that the gate portion 18 is formed in the lens member 7, and is common to the toner adhesion amount sensor 1A in other respects. ..

本実施形態のゲート部１８は、第１実施形態のゲート部８と同様に、レンズ部材７の側面７ｓでかつ隙間部を挟んで第１領域（ＬＥＤ３側の領域）と第２領域（フォトダイオード４、５側の領域）とにまたがった位置に形成されている。このため、第１実施形態と同様に、レンズ部材の形成工程において樹脂を第１領域と第２領域に直接注入することができ、レンズ部材７における樹脂の回り込み不足による不良を低減することができる。 Similar to the gate portion 8 of the first embodiment, the gate portion 18 of the present embodiment has a first region (region on the LED3 side) and a second region (photodiode) on the side surface 7s of the lens member 7 and sandwiching the gap portion. It is formed at a position straddling the regions on the 4th and 5th sides). Therefore, as in the first embodiment, the resin can be directly injected into the first region and the second region in the process of forming the lens member, and defects due to insufficient wraparound of the resin in the lens member 7 can be reduced. ..

また、本実施形態のゲート部１８は、レンズ部材７の側面７ｓから最も離れた表面１８ｓが粗面化されている。一方、図６（Ａ）に示すように、レンズ部材７の側面７ｓから最も離れたゲート部８の表面８ｓが粗面化されていない場合には、ＬＥＤ３の照射光がゲート部８に伝搬すると、ゲート部８の表面８ｓで反射し、その内面反射光がフォトダイオード４、５に入射されるおそれがある。 Further, in the gate portion 18 of the present embodiment, the surface 18s farthest from the side surface 7s of the lens member 7 is roughened. On the other hand, as shown in FIG. 6A, when the surface 8s of the gate portion 8 farthest from the side surface 7s of the lens member 7 is not roughened, the irradiation light of the LED 3 propagates to the gate portion 8. , It is reflected on the surface 8s of the gate portion 8, and the light reflected on the inner surface thereof may be incident on the photodiodes 4 and 5.

これに対して、本実施形態に係るトナー付着量センサ１Ｂは、図６（Ｂ）に示すように、ＬＥＤ３の照射光がゲート部１８に伝搬しても、ゲート部１８の表面１８ｓで内面反射光が分散される。その結果、フォトダイオード４、５が内面反射光の影響を受けにくくなる。 On the other hand, in the toner adhesion amount sensor 1B according to the present embodiment, as shown in FIG. 6B, even if the irradiation light of the LED 3 propagates to the gate portion 18, the surface 18s of the gate portion 18 reflects the inner surface. The light is dispersed. As a result, the photodiodes 4 and 5 are less affected by the internally reflected light.

（トナー付着量センサの製造方法）
次に、本実施形態に係るトナー付着量センサ１Ｂの製造方法について説明する。本実施形態に係る製造方法は、第１工程と、第２工程と、レンズ部材形成工程と、第３工程と、第４工程と、を含む。第１工程および第２工程は、第１実施形態に係る製造方法と共通しているため、ここでは説明を省略する。 (Manufacturing method of toner adhesion amount sensor)
Next, a method of manufacturing the toner adhesion amount sensor 1B according to the present embodiment will be described. The manufacturing method according to the present embodiment includes a first step, a second step, a lens member forming step, a third step, and a fourth step. Since the first step and the second step are common to the manufacturing method according to the first embodiment, description thereof will be omitted here.

レンズ部材形成工程では、第１実施形態に係る製造方法と同様に、金型を用いた樹脂射出成形によってレンズ部材７が形成される。レンズ部材７の側面７ｓでかつ隙間部を挟んで一方側の第１領域（ＬＥＤ３側の領域）と他方側の第２領域（フォトダイオード４、５側の領域）とにまたがる位置が、金型への樹脂注入を行うゲート位置となる。ゲート位置には、ゲート部１８が形成される。本実施形態に係る製造方法では、ゲート部１８が、レンズ部材７下部の側面から突出する長さに形成される。 In the lens member forming step, the lens member 7 is formed by resin injection molding using a mold, as in the manufacturing method according to the first embodiment. The position of the side surface 7s of the lens member 7 that straddles the first region on one side (region on the LED3 side) and the second region on the other side (regions on the photodiodes 4 and 5) across the gap is the mold. This is the gate position for injecting resin into. A gate portion 18 is formed at the gate position. In the manufacturing method according to the present embodiment, the gate portion 18 is formed to have a length protruding from the side surface of the lower portion of the lens member 7.

図７（Ａ）に示す第３工程では、第２工程で作製したセンサ集合体の上面に、レンズ部材形成工程で作製した複数（本実施形態では、１０個）のレンズ部材７が搭載される。このときゲート部１８は、基板２およびホルダ６の側面から突出した状態になる。 In the third step shown in FIG. 7A, a plurality of (10 in this embodiment) lens members 7 manufactured in the lens member forming step are mounted on the upper surface of the sensor assembly manufactured in the second step. .. At this time, the gate portion 18 is in a state of protruding from the side surfaces of the substrate 2 and the holder 6.

図７（Ｂ）に示す第４工程では、図８に示すダイサーＤによるダイシング加工によって、第３工程においてレンズ部材７が搭載されたセンサ集合体から、複数（本実施形態では、１０個）のトナー付着量センサ１Ｂが作製される。なお、厳密には、ラインＬ２のＶカット溝に沿って折り加工が行われた後に、ラインＬ１に沿ってダイシング加工が行われる。 In the fourth step shown in FIG. 7B, a plurality of sensors (10 in the present embodiment) from the sensor assembly on which the lens member 7 is mounted in the third step are obtained by dicing with the dicer D shown in FIG. The toner adhesion amount sensor 1B is manufactured. Strictly speaking, after the folding process is performed along the V-cut groove of the line L2, the dicing process is performed along the line L1.

ダイシング加工では、ホルダ集合体６０がカットされることに加えて、ゲート部１８のうちの基板２およびホルダ６の側面から突出した部分もカットされる。このときに、ゲート部１８の表面１８ｓ（カットされた表面）が粗面化される。 In the dicing process, in addition to cutting the holder assembly 60, the portions of the gate portion 18 protruding from the side surfaces of the substrate 2 and the holder 6 are also cut. At this time, the surface 18s (cut surface) of the gate portion 18 is roughened.

粗面化による表面１８ｓの粗さは、ダイサーＤの回転速度および／またはダイサーＤのカット速度（移動速度）に応じて制御することができる。例えば、ダイサーＤの回転速度およびカット速度を遅くすることで、表面１８ｓの粗さを大きくすることができる。しかしながら、同時にホルダ集合体６０もカットするので、ホルダ集合体６０をカットできる程度の速度は確保する必要がある。 The roughness of the surface 18s due to the roughening can be controlled according to the rotation speed of the dicer D and / or the cutting speed (moving speed) of the dicer D. For example, the roughness of the surface 18s can be increased by slowing down the rotation speed and the cutting speed of the dicer D. However, since the holder assembly 60 is also cut at the same time, it is necessary to secure a speed sufficient to cut the holder assembly 60.

結局、本実施形態に係る製造方法によれば、レンズ部材７の側面７ｓでかつ隙間部を挟んで一方側の第１領域（ＬＥＤ３側の領域）と他方側の第２領域（フォトダイオード４、５側の領域）とにまたがる位置を、金型への樹脂注入を行うゲート位置としているので、レンズ部材形成工程における樹脂の回り込み不足を解消することができる。 After all, according to the manufacturing method according to the present embodiment, the first region (region on the LED3 side) on one side and the second region (photodiode 4) on one side and the second region (photodiode 4) on the side surface 7s of the lens member 7 and across the gap portion Since the position straddling the region on the 5th side is the gate position for injecting the resin into the mold, it is possible to eliminate the insufficient wraparound of the resin in the lens member forming step.

また、本実施形態に係る製造方法によれば、ゲート部１８の粗面化の工程を別途設けることなく、第４工程のダイシング加工でホルダ集合体６０のカットとゲート部１８の粗面化を同時に行っているので、製造工程を簡素化してコスト低減を図ることができる。 Further, according to the manufacturing method according to the present embodiment, the holder assembly 60 is cut and the gate portion 18 is roughened by the dicing process in the fourth step without separately providing the roughening step of the gate portion 18. Since it is performed at the same time, the manufacturing process can be simplified and the cost can be reduced.

［変形例］
以上、本発明に係るトナー付着量センサおよびその製造方法の実施形態について説明したが、本発明は上記各実施形態に限定されるものではない。 [Modification example]
Although the embodiment of the toner adhesion amount sensor and the manufacturing method thereof according to the present invention has been described above, the present invention is not limited to each of the above embodiments.

例えば、レンズ部材７は、ホルダ６の遮光壁６ｗが収まる隙間部を有し、かつ当該レンズ部材７の側面７ｓでかつ隙間部を挟んで一方側の第１領域（ＬＥＤ３側の領域）と他方側の第２領域（フォトダイオード４、５側の領域）とにまたがる位置に、側面７ｓから突出したゲート部８（１８）を有するのであれば、適宜構成を変更することができる。 For example, the lens member 7 has a gap portion in which the light-shielding wall 6w of the holder 6 is accommodated, and is on the side surface 7s of the lens member 7 and sandwiches the gap portion with the first region (region on the LED3 side) on one side and the other. If the gate portion 8 (18) protruding from the side surface 7s is provided at a position straddling the second region on the side (regions on the side of the photodiodes 4 and 5), the configuration can be appropriately changed.

ゲート部８（１８）は、レンズ部材７の側面７ｓに向かって末広がり状に形成されていることが好ましいが、必ずしも末広がり状である必要はなく、任意の形状に変更することができる。 The gate portion 8 (18) is preferably formed in a divergent shape toward the side surface 7s of the lens member 7, but the gate portion 8 (18) does not necessarily have to be divergent and can be changed to an arbitrary shape.

遮光壁６ｗは、レンズ部材７を伝搬するＬＥＤ３の迷光（内面反射光）がフォトダイオード４、５に入射するのを抑制できるのであれば、その高さおよび形状は適宜変更することができる。例えば、遮光壁６ｗは、レンズ部材７の上面から突出していてもよいし、レンズ部材７の上面に達していなくてもよい。 The height and shape of the light-shielding wall 6w can be appropriately changed as long as the stray light (internally reflected light) of the LED 3 propagating through the lens member 7 can be suppressed from entering the photodiodes 4 and 5. For example, the light-shielding wall 6w may project from the upper surface of the lens member 7, or may not reach the upper surface of the lens member 7.

本発明の「発光部」は、ＬＥＤ３以外の発光素子で構成することができる。また、本発明の「受光部」は、１つのフォトダイオードで構成してもよいし、フォトダイオード４、５以外の受光素子で構成してもよい。 The "light emitting unit" of the present invention can be composed of a light emitting element other than the LED 3. Further, the "light receiving unit" of the present invention may be composed of one photodiode, or may be composed of a light receiving element other than the photodiodes 4 and 5.

１Ａ、１Ｂ トナー付着量センサ
２ 基板
３ ＬＥＤ（発光部）
４、５ フォトダイオード（受光部）
６ ホルダ
６ｗ 遮光壁
７ レンズ部材
７ａ 発光レンズ部
７ｂ 受光レンズ部
８、１８ ゲート部
２０ 集合基板
６０ ホルダ集合体
１００ 測定対象物 1A, 1B Toner adhesion sensor 2 Board 3 LED (light emitting part)
4, 5 photodiode (light receiving part)
6 Holder 6w Light-shielding wall 7 Lens member 7a Light-emitting lens part 7b Light-receiving lens part 8, 18 Gate part 20 Assembly board 60 Holder assembly 100 Measurement object

Claims (5)

測定対象物に照射光を照射し、前記照射光に対する前記測定対象物からの反射光を受光するトナー付着量センサの製造方法であって、
集合基板を構成する複数の基板の上面に、前記照射光を照射する発光部と、前記反射光を受光する受光部と、前記発光部と前記受光部との間に位置する遮光壁と、がそれぞれ形成されたセンサ集合体を作製するセンサ集合体作製工程と、
前記基板の上面に搭載されたときに前記発光部の上方に位置する発光レンズ部と、前記基板の上面に搭載されたときに前記受光部の上方に位置する受光レンズ部と、前記遮光壁が収まる隙間部と、を有するレンズ部材を、金型を用いた樹脂射出成形によって形成するレンズ部材形成工程と、
前記センサ集合体の上面に複数の前記レンズ部材を搭載した状態で、ダイサーによるダイシング加工によって、前記センサ集合体から複数のトナー付着量センサを作製するダインシング工程と、
を含み、
前記レンズ部材形成工程では、
前記レンズ部材の側面で、かつ、前記隙間部を挟んで一方側の第１領域と他方側の第２領域とにまたがる位置を、前記金型への樹脂注入を行うゲート位置とする
ことを特徴とするトナー付着量センサの製造方法。 A method for manufacturing a toner adhesion amount sensor that irradiates an object to be measured with irradiation light and receives the reflected light from the object to be measured with respect to the irradiation light.
On the upper surface of a plurality of substrates constituting the collective substrate, a light emitting portion that irradiates the irradiation light, a light receiving portion that receives the reflected light, and a light-shielding wall located between the light emitting portion and the light receiving portion are formed. A sensor assembly manufacturing process for manufacturing each formed sensor assembly, and a sensor assembly manufacturing process.
A light emitting lens portion located above the light emitting portion when mounted on the upper surface of the substrate, a light receiving lens portion located above the light receiving portion when mounted on the upper surface of the substrate, and the light shielding wall A lens member forming step of forming a lens member having a gap to be accommodated by resin injection molding using a mold.
A dicing step of producing a plurality of toner adhesion amount sensors from the sensor assembly by dicing with a dicer while the plurality of lens members are mounted on the upper surface of the sensor assembly.
Including
In the lens member forming step,
The gate position on the side surface of the lens member and across the first region on one side and the second region on the other side across the gap is defined as the gate position for injecting resin into the mold. A method for manufacturing a toner adhesion amount sensor. 前記レンズ部材形成工程において、前記ゲート位置に、前記レンズ部材の側面から突出したゲート部を前記樹脂注入によって形成し、
前記ダインシング工程において、前記ダイシング加工時に、前記ダイサーによって前記ゲート部表面の粗面化を行う
ことを特徴とする請求項１に記載のトナー付着量センサの製造方法。 In the lens member forming step, a gate portion protruding from the side surface of the lens member is formed at the gate position by the resin injection.
The method for manufacturing a toner adhesion amount sensor according to claim 1, wherein in the dicing step, the surface of the gate portion is roughened by the dicing during the dicing process. 測定対象物に照射光を照射し、前記照射光に対する前記測定対象物からの反射光を受光するトナー付着量センサであって、
基板と、
前記基板の上面に設けられた、前記照射光を照射する発光部と、
前記基板の上面に設けられた、前記反射光を受光する受光部と、
前記発光部の上方に位置する発光レンズ部および前記受光部の上方に位置する受光レンズ部を下面側に有するレンズ部材と、
前記レンズ部材を前記発光部側の第１領域と前記受光部側の第２領域とに二分し、前記レンズ部材を前記第１領域から前記第２領域に向かって伝搬する迷光を遮光する遮光壁と、を備え、
前記レンズ部材は、樹脂で形成されるとともに、当該レンズ部材の側面でかつ前記第１領域と前記第２領域とにまたがった位置に、当該レンズ部材の側面から突出したゲート部を有する
ことを特徴とするトナー付着量センサ。 A toner adhesion amount sensor that irradiates an object to be measured with irradiation light and receives the reflected light from the object to be measured with respect to the irradiation light.
With the board
A light emitting unit that irradiates the irradiation light provided on the upper surface of the substrate,
A light receiving portion provided on the upper surface of the substrate and receiving the reflected light,
A lens member having a light emitting lens portion located above the light emitting portion and a light receiving lens portion located above the light receiving portion on the lower surface side.
A light-shielding wall that divides the lens member into a first region on the light emitting portion side and a second region on the light receiving portion side, and shields the lens member from stray light propagating from the first region toward the second region. And with
The lens member is made of resin and has a gate portion protruding from the side surface of the lens member at a position on the side surface of the lens member and straddling the first region and the second region. Toner adhesion amount sensor. 前記ゲート部は、前記レンズ部材の側面に向かって末広がり状に形成されている
ことを特徴とする請求項３に記載のトナー付着量センサ。 The toner adhesion amount sensor according to claim 3, wherein the gate portion is formed so as to spread toward the side surface of the lens member. 前記ゲート部は、前記レンズ部材の側面から最も離れた表面が粗面化されている
ことを特徴とする請求項３または４に記載のトナー付着量センサ。 The toner adhesion amount sensor according to claim 3 or 4, wherein the surface of the gate portion farthest from the side surface of the lens member is roughened.
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