JP6107446B2

JP6107446B2 - Optical writing apparatus and image forming apparatus

Info

Publication number: JP6107446B2
Application number: JP2013121569A
Authority: JP
Inventors: 長坂　泰志; 泰志長坂; 隆宏松尾
Original assignee: Konica Minolta Inc
Current assignee: Konica Minolta Inc
Priority date: 2013-06-10
Filing date: 2013-06-10
Publication date: 2017-04-05
Anticipated expiration: 2033-06-10
Also published as: JP2014237285A

Description

本発明は、光書込装置、及び当該光書込装置を備える画像形成装置に関する。 The present invention relates to an optical writing device and an image forming apparatus including the optical writing device.

従来、光書込装置の光源として、有機発光ダイオード（Organic Light-Emitting Diode：ＯＬＥＤ）を使用する構成が知られている。ＯＬＥＤは、高輝度且つ高温で使用した場合、劣化速度が速くなる。光書込装置の光源等の発熱部材の放熱には、放熱部材が使用されることが一般的である。この放熱部材を光源基板上の平面部に接着剤等を用いて貼り付けることで、放熱効果を持たせてきた。 Conventionally, a configuration using an organic light-emitting diode (OLED) as a light source of an optical writing device is known. The OLED has a high degradation rate when used at high brightness and high temperature. In general, a heat radiating member is used to radiate heat from a heat generating member such as a light source of an optical writing device. A heat dissipation effect has been provided by attaching the heat dissipation member to a flat portion on the light source substrate using an adhesive or the like.

光源基板には複数のＯＬＥＤが長手方向に沿って並べられて配列されているため、各ＯＬＥＤの発光時間が同一の場合でも、光源基板の長手方向の端部よりも中央部の方が高温となる。光源基板に生じる温度ムラは、ＯＬＥＤの劣化速度のムラの要因となるため、結果として画像の劣化が発生するという問題がある。 Since a plurality of OLEDs are arranged side by side along the longitudinal direction on the light source substrate, even when the light emission times of the respective OLEDs are the same, the central portion is hotter than the longitudinal end portion of the light source substrate. Become. The temperature unevenness generated in the light source substrate causes a variation in the deterioration rate of the OLED, resulting in a problem that the image is deteriorated as a result.

そこで、上記問題を解決すべく、例えば、放熱部材の接触面に直交する何れかの断面において、放熱部材の端部よりも中央部の方が放熱フィンの配置密度又は断面積が大きくなるように形成された技術が提案されている（例えば、特許文献１参照）。
また、発光素子に放熱部材が設けられた構成で、発光素子の端部よりも中央部の方が放熱部材の放熱フィンの表面積が大きくなるように形成された技術が提案されている（例えば、特許文献２参照）。 Therefore, in order to solve the above problem, for example, in any cross section orthogonal to the contact surface of the heat radiating member, the arrangement density or cross sectional area of the heat radiating fins is larger at the center than at the end of the heat radiating member. A formed technique has been proposed (see, for example, Patent Document 1).
Further, there has been proposed a technique in which a heat dissipation member is provided in the light emitting element, and a surface area of the heat dissipation fin of the heat dissipation member is larger in the center portion than in the end portion of the light emitting element (for example, Patent Document 2).

特開２０１１−２２１１５９号公報JP 2011-221159 A 特開２００６−２０１７９２号公報JP 2006-201792 A

しかしながら、上記特許文献１及び特許文献２記載の技術では、光源基板の発光部と非発光部とを問わず全面で放熱部材と接触しているため、光源基板の端部と中央部との間に発生する温度ムラを効率よく解消すべく構成が複雑となっており、コストがかかるという問題がある。 However, in the techniques described in Patent Document 1 and Patent Document 2, since the entire surface is in contact with the heat dissipation member regardless of the light emitting portion and the non-light emitting portion of the light source substrate, the gap between the end portion and the central portion of the light source substrate There is a problem that the configuration is complicated to efficiently eliminate the temperature unevenness occurring in the device, and costs are increased.

本発明は、光源基板に生じる温度ムラの低減を簡易且つ安価な構成で実現することが可能な光書込装置、及び当該光書込装置を備える画像形成装置を提供することを目的とする。 SUMMARY OF THE INVENTION An object of the present invention is to provide an optical writing device capable of reducing temperature unevenness generated in a light source substrate with a simple and inexpensive configuration, and an image forming apparatus including the optical writing device.

請求項１に記載の発明は、上記目的を達成するためになされたものであり、
光書込装置において、
複数の光源からなる発光部を備える光源基板と、
前記光源基板に貼り付けられた放熱部材と、
を備え、
前記光源基板及び前記放熱部材は、光放射方向に垂直な平面において長尺方向と当該長尺方向に直交する短尺方向に延在し、
前記発光部は、前記光源基板の長尺方向に延在し、
前記放熱部材は、長尺方向の長さが前記発光部の長尺方向の長さよりも長くなるように形成されるとともに、当該放熱部材の長尺方向の各端部が前記発光部の長尺方向の各端部よりも外側となるように貼り付けられ、
前記放熱部材には、前記光源基板との接触面の面積が、前記発光部の長尺方向の各端部よりも中央部の方が大きくなるように形成された開口部が設けられていることを特徴とする。 The invention described in claim 1 has been made to achieve the above object,
In the optical writing device,
A light source substrate including a light emitting unit composed of a plurality of light sources ;
A heat radiating member attached to the front Symbol light source substrate,
With
The light source substrate and the heat dissipation member extend in a long direction and a short direction perpendicular to the long direction in a plane perpendicular to the light emission direction,
The light emitting portion extends in the longitudinal direction of the light source substrate,
The heat dissipating member is formed such that the length in the longitudinal direction is longer than the length in the longitudinal direction of the light emitting unit, and each end of the heat dissipating member in the longitudinal direction is the length of the light emitting unit. Pasted to be outside of each end of the direction,
Wherein the heat radiating member, the area of the contact surface between the light source substrate, an opening portion formed towards the size Kunar so the middle than the ends in the longitudinal direction of the light emitting portion is provided It is characterized by that.

請求項２に記載の発明は、請求項１に記載の光書込装置において、
前記接触面の面積が、前記発光部の長尺方向の各端部から中央部に向かうにつれて徐々に大きくなっていることを特徴とする。 The invention according to claim 2 is the optical writing device according to claim 1,
The area of the contact surface is gradually increased from each longitudinal end portion of the light emitting portion toward the central portion.

請求項３に記載の発明は、請求項１又は２に記載の光書込装置において、
前記放熱部材の前記光源基板に貼り付けられる面には、長尺方向に沿って同一形状の前記開口部が複数設けられ、
長尺方向に隣接する前記開口部間の間隔は、前記放熱部材の長尺方向の各端部側に設けられた開口部間の間隔よりも中央部に設けられた開口部間の間隔の方が広いことを特徴とする。 The invention according to claim 3 is the optical writing device according to claim 1 or 2,
A plurality of openings having the same shape are provided along the longitudinal direction on the surface of the heat radiating member attached to the light source substrate.
The interval between the openings adjacent to each other in the longitudinal direction is equal to the interval between the openings provided in the central portion rather than the interval between the openings provided on each end side in the longitudinal direction of the heat dissipation member. Is characterized by wide.

請求項４に記載の発明は、請求項１又は２に記載の光書込装置において、
前記放熱部材の前記光源基板に貼り付けられる面には、長尺方向に沿って前記開口部が複数設けられ、
前記放熱部材の長尺方向の各端部側に設けられた開口部の開口幅よりも中央部に設けられた開口部の開口幅の方が小さいことを特徴とする。 The invention according to claim 4 is the optical writing device according to claim 1 or 2,
Wherein the said surface to be pasted on the light source substrate of the heat radiating member, the opening is provided in a plurality along a longitudinal direction,
The opening width of the opening provided in the central part is smaller than the opening width of the opening provided on each end side in the longitudinal direction of the heat radiating member.

請求項５に記載の発明は、請求項４に記載の光書込装置において、
前記複数の光源は、前記開口部の位置に合わせて前記光源基板上に配置され、
前記放熱部材は、前記光源基板の光が出射される側の面に貼り付けられていることを特徴とする。 The invention according to claim 5 is the optical writing device according to claim 4,
The plurality of light sources are arranged on the light source substrate in accordance with the position of the opening,
The heat radiating member is affixed to a surface of the light source substrate on which light is emitted.

請求項６に記載の発明は、請求項４に記載の光書込装置において、
前記複数の光源は、前記開口部の位置と前記光源基板の前記放熱部材が貼り付けられる面の法線方向で重ならないように配置されていることを特徴とする。
請求項７に記載の発明は、
光書込装置において、
複数の光源からなる発光部を備える光源基板と、
前記光源から出射された光を像担持体上に集光させる光学素子と、
前記光源基板に貼り付けられた放熱部材と、
を備え、
前記光源基板及び前記放熱部材は、光放射方向に垂直な平面において長尺方向と当該長尺方向に直交する短尺方向に延在し、
前記発光部は、前記光源基板の長尺方向に延在し、
前記放熱部材は、長尺方向の長さが前記発光部の長尺方向の長さよりも長くなるように形成されるとともに、当該放熱部材の長尺方向の各端部が前記発光部の長尺方向の各端部
よりも外側となるように貼り付けられ、
前記放熱部材の前記光源基板に貼り付けられる面には、長尺方向に沿って同一形状の開口部が複数設けられ、
長尺方向に隣接する前記開口部間の間隔は、前記放熱部材の長尺方向の各端部側に設けられた開口部間の間隔よりも中央部に設けられた開口部間の間隔の方が広いことを特徴とする。
請求項８に記載の発明は、
光書込装置において、
複数の光源からなる発光部を備える光源基板と、
前記光源から出射された光を像担持体上に集光させる光学素子と、
前記光源基板に貼り付けられた放熱部材と、
を備え、
前記光源基板及び前記放熱部材は、光放射方向に垂直な平面において長尺方向と当該長
尺方向に直交する短尺方向に延在し、
前記発光部は、前記光源基板の長尺方向に延在し、
前記放熱部材は、長尺方向の長さが前記発光部の長尺方向の長さよりも長くなるように形成されるとともに、当該放熱部材の長尺方向の各端部が前記発光部の長尺方向の各端部よりも外側となるように貼り付けられ、
前記放熱部材の前記光源基板に貼り付けられる面には、長尺方向に沿って開口部が複数設けられ、
前記放熱部材の長尺方向の各端部側に設けられた開口部の開口幅よりも中央部に設けられた開口部の開口幅の方が小さいことを特徴とする。
請求項９に記載の発明は、請求項８に記載の光書込装置において、
前記複数の光源は、前記開口部の位置に合わせて前記光源基板上に配置され、
前記放熱部材は、前記光源基板の光が出射される側の面に貼り付けられていることを特徴とする。
請求項１０に記載の発明は、請求項８に記載の光書込装置において、
前記複数の光源は、前記開口部の位置と前記光源基板の前記放熱部材が貼り付けられる面の法線方向で重ならないように配置されていることを特徴とする。 According to a sixth aspect of the present invention, in the optical writing device according to the fourth aspect,
The plurality of light sources are arranged so as not to overlap in the normal direction of the position of the opening and the surface of the light source substrate to which the heat dissipation member is attached.
The invention described in claim 7
In the optical writing device,
A light source substrate including a light emitting unit composed of a plurality of light sources;
An optical element for condensing the light emitted from the light source on the image carrier;
A heat dissipation member affixed to the light source substrate;
With
The light source substrate and the heat dissipation member extend in a long direction and a short direction perpendicular to the long direction in a plane perpendicular to the light emission direction,
The light emitting portion extends in the longitudinal direction of the light source substrate,
The heat dissipating member is formed such that the length in the longitudinal direction is longer than the length in the longitudinal direction of the light emitting unit, and each end of the heat dissipating member in the longitudinal direction is the length of the light emitting unit. Each end of direction
Pasted to the outside,
A plurality of openings having the same shape are provided along the longitudinal direction on the surface of the heat radiating member to be attached to the light source substrate.
The interval between the openings adjacent to each other in the longitudinal direction is equal to the interval between the openings provided in the central portion rather than the interval between the openings provided on each end side in the longitudinal direction of the heat dissipation member. Is characterized by wide.
The invention according to claim 8 provides:
In the optical writing device,
A light source substrate including a light emitting unit composed of a plurality of light sources;
An optical element for condensing the light emitted from the light source on the image carrier;
A heat dissipation member affixed to the light source substrate;
With
The light source substrate and the heat dissipating member have a longitudinal direction and the length in a plane perpendicular to the light emitting direction.
Extending in the short direction perpendicular to the scale direction,
The light emitting portion extends in the longitudinal direction of the light source substrate,
The heat dissipating member is formed such that the length in the longitudinal direction is longer than the length in the longitudinal direction of the light emitting unit, and each end of the heat dissipating member in the longitudinal direction is the length of the light emitting unit. Pasted to be outside of each end of the direction,
A plurality of openings are provided along the longitudinal direction on the surface of the heat radiating member to be attached to the light source substrate.
The opening width of the opening provided in the central part is smaller than the opening width of the opening provided on each end side in the longitudinal direction of the heat radiating member.
The invention according to claim 9 is the optical writing device according to claim 8,
The plurality of light sources are arranged on the light source substrate in accordance with the position of the opening,
The heat radiating member is affixed to a surface of the light source substrate on which light is emitted.
The invention according to claim 10 is the optical writing device according to claim 8,
The plurality of light sources are arranged so as not to overlap in the normal direction of the position of the opening and the surface of the light source substrate to which the heat dissipation member is attached.

請求項１１に記載の発明は、光書込装置において、
複数の光源からなる発光部を備える光源基板と、
前記光源から出射された光を像担持体上に集光させる光学素子と、
前記光源基板に貼り付けられた放熱部材と、
前記光源基板と前記放熱部材との間に配置される中間部材と、
を備え、
前記光源基板、前記放熱部材、及び前記中間部材は、光放射方向に垂直な平面において長尺方向と当該長尺方向に直交する短尺方向に延在し、
前記発光部は、前記光源基板の長尺方向に延在し、
前記中間部材は、長尺方向の長さが前記発光部の長尺方向の長さよりも長くなるように形成されるとともに、当該中間部材の長尺方向の各端部が前記発光部の長尺方向の各端部よりも外側となるように貼り付けられ、
前記中間部材の熱伝導率は、各端部よりも中央部の方が大きいことを特徴とする。 The invention according to claim 11 is an optical writing apparatus, wherein
A light source substrate including a light emitting unit composed of a plurality of light sources;
An optical element for condensing the light emitted from the light source on the image carrier;
A heat dissipation member affixed to the light source substrate;
An intermediate member disposed between the light source substrate and the heat dissipation member;
With
The light source substrate, the heat radiating member, and the intermediate member extend in a long direction and a short direction perpendicular to the long direction in a plane perpendicular to the light emission direction,
The light emitting portion extends in the longitudinal direction of the light source substrate,
The intermediate member is formed such that the length in the longitudinal direction is longer than the length in the longitudinal direction of the light emitting portion, and each end portion of the intermediate member in the longitudinal direction is the length of the light emitting portion. Pasted to be outside of each end of the direction,
The intermediate member has a thermal conductivity that is greater at the center than at each end.

請求項１２に記載の発明は、画像形成装置において、
像担持体と、
前記像担持体を帯電させる帯電部と、
前記帯電部により帯電された前記像担持体に対して光を照射することで前記像担持体上に静電潜像を形成する請求項１〜１１のいずれか一項に記載の光書込装置と、
前記光を照射された前記像担持体に現像剤を供給することで前記静電潜像を現像剤による像に顕像化する現像部と、
前記現像剤による像を記録媒体に転写する転写部と、
前記転写部により転写された前記現像剤による像を前記記録媒体に定着する定着部と、
を備えることを特徴とする。 According to a twelfth aspect of the present invention, in the image forming apparatus,
An image carrier;
A charging unit for charging the image carrier;
Optical writing device according to any one of claims 1 to 11 to form an electrostatic latent image on the image bearing member by irradiating light to the charging unit said image bearing member charged by When,
A developing unit that visualizes the electrostatic latent image into an image by a developer by supplying a developer to the image carrier irradiated with the light;
A transfer section for transferring an image formed by the developer onto a recording medium;
A fixing unit that fixes the image of the developer transferred by the transfer unit to the recording medium;
It is characterized by providing.

本発明によれば、光源基板に生じる温度ムラの低減を簡易且つ安価な構成で実現することができる。 According to the present invention, it is possible to reduce the temperature unevenness generated in the light source substrate with a simple and inexpensive configuration.

本実施形態に係る画像形成装置の概略構成を示す図である。1 is a diagram illustrating a schematic configuration of an image forming apparatus according to an exemplary embodiment. 本実施形態に係る光プリントヘッドの概略構成を示す図である。It is a figure which shows schematic structure of the optical print head which concerns on this embodiment. 本実施形態に係る光プリントヘッドの全体構成を示す図である。1 is a diagram illustrating an overall configuration of an optical print head according to an embodiment. 放熱板に形成された開口部の幅の変化を示す斜視図である。It is a perspective view which shows the change of the width | variety of the opening part formed in the heat sink. 光源基板の概略構成を示す平面図である。It is a top view which shows schematic structure of a light source substrate. 変形例１に係る光源基板及び放熱板の構成を示す斜視図である。It is a perspective view which shows the structure of the light source substrate which concerns on the modification 1, and a heat sink. 変形例２に係る光源基板及び放熱板の構成を示す斜視図である。It is a perspective view which shows the structure of the light source substrate which concerns on the modification 2, and a heat sink. 変形例３に係る光源基板及び放熱板の構成を示す斜視図である。It is a perspective view which shows the structure of the light source substrate which concerns on the modification 3, and a heat sink. 変形例４に係る光源基板及び放熱板の構成を示す斜視図である。It is a perspective view which shows the structure of the light source substrate which concerns on the modification 4, and a heat sink. 変形例５に係る光源基板及び放熱板の構成を示す斜視図である。It is a perspective view which shows the structure of the light source substrate which concerns on the modification 5, and a heat sink. 変形例６に係る光源基板及び放熱板の構成を示す斜視図である。It is a perspective view which shows the structure of the light source substrate which concerns on the modification 6, and a heat sink. 変形例７に係る光源基板及び放熱板の構成を示す平面図である。It is a top view which shows the structure of the light source substrate which concerns on the modification 7, and a heat sink. 変形例８に係る光源基板及び放熱板の構成を示す平面図である。It is a top view which shows the structure of the light source substrate which concerns on the modification 8, and a heat sink. 変形例９に係る光源基板、放熱板及び中間部材の構成を示す図である。It is a figure which shows the structure of the light source board | substrate which concerns on the modification 9, a heat sink, and an intermediate member.

以下に、本発明を実施するための最良の形態について、図面を用いて説明する。 The best mode for carrying out the present invention will be described below with reference to the drawings.

本実施形態に係る画像形成装置１０００は、例えば、プリンターやデジタル複写機等として用いられ、図１に示すように、シアン、マゼンタ、イエロー、ブラックの色毎に設けられた複数の光プリントヘッド（光書込装置）１００と、光プリントヘッド１００に対応して設けられた感光体ドラム等の像担持体２００と、像担持体２００を帯電させる帯電部２１０と、光を照射された像担持体２００に現像剤を供給することで静電潜像を現像剤による像に顕像化する現像部２２０と、中間転写ベルト３００と、現像剤による像を記録媒体に転写する転写ローラー（転写部）４００と、転写ローラー４００により転写された現像剤による像を記録媒体に定着する定着部５００と、等を備えて構成される。 An image forming apparatus 1000 according to the present embodiment is used as, for example, a printer or a digital copying machine. As shown in FIG. 1, a plurality of optical print heads (for each of cyan, magenta, yellow, and black) ( Optical writing device 100, an image carrier 200 such as a photosensitive drum provided corresponding to the optical print head 100, a charging unit 210 for charging the image carrier 200, and an image carrier irradiated with light. A developing unit 220 that visualizes the electrostatic latent image into an image formed by the developer by supplying the developer to 200, an intermediate transfer belt 300, and a transfer roller (transfer unit) that transfers the image formed by the developer to a recording medium. 400, a fixing unit 500 that fixes an image of the developer transferred by the transfer roller 400 to a recording medium, and the like.

画像形成装置１０００は、光プリントヘッド１００より照射される光によって像担持体２００に静電潜像を形成させる。次に、画像形成装置１０００は、静電潜像が形成された像担持体２００に現像剤を供給することで当該静電潜像を現像剤による像に顕像化し、中間転写ベルト３００上に当該現像剤による像を転写させる。次に、画像形成装置１０００は、中間転写ベルト３００に転写された現像剤による像を転写ローラー４００によって記録媒体としての用紙Ｐに押圧して転写させる。次に、画像形成装置１０００は、定着部５００によって用紙Ｐを加熱及び加圧することで、現像剤による像を用紙Ｐ上に定着する。そして、画像形成装置１０００は、用紙Ｐを排紙ローラー（図示省略）等により搬送してトレイ（図示省略）に排紙することで画像形成処理を行う。 The image forming apparatus 1000 forms an electrostatic latent image on the image carrier 200 with light emitted from the optical print head 100. Next, the image forming apparatus 1000 supplies the developer to the image carrier 200 on which the electrostatic latent image is formed, thereby visualizing the electrostatic latent image into an image using the developer, and the image is formed on the intermediate transfer belt 300. The image by the developer is transferred. Next, the image forming apparatus 1000 presses and transfers the developer image transferred to the intermediate transfer belt 300 onto the paper P as a recording medium by the transfer roller 400. Next, the image forming apparatus 1000 heats and pressurizes the paper P by the fixing unit 500, thereby fixing the developer image on the paper P. The image forming apparatus 1000 performs the image forming process by conveying the paper P by a paper discharge roller (not shown) and discharging the paper onto a tray (not shown).

光プリントヘッド１００は、図１〜図３に示すように、帯電部２１０により帯電された像担持体２００に対して光Ｌを照射することで像担持体２００上に静電潜像を形成する装置である。光プリントヘッド１００は、光Ｌを出射させる発光素子（光源）１１２（図５を参照）を複数備える光源基板１１と、光源基板１１に備えられた複数の発光素子１１２から出射された光Ｌを像担持体２００上に集光させる光学素子である屈折率分布型ロッドレンズアレイ（ＳＬＡ（登録商標）；Selfoc（登録商標） Lens Array）１２（以下、ＳＬＡ１２）と、光源基板１１に貼り付けられた放熱板（放熱部材）１４と、を備え、これらをホルダー１３で保持するように構成されている。 As shown in FIGS. 1 to 3, the optical print head 100 forms an electrostatic latent image on the image carrier 200 by irradiating the image carrier 200 charged by the charging unit 210 with light L. Device. The optical print head 100 includes a light source substrate 11 provided with a plurality of light emitting elements (light sources) 112 (see FIG. 5) that emit light L, and light L emitted from the plurality of light emitting elements 112 provided on the light source substrate 11. A refractive index distribution type rod lens array (SLA (registered trademark); Selfoc (registered trademark) Lens Array) 12 (hereinafter, referred to as SLA 12), which is an optical element to be condensed on the image carrier 200, is attached to the light source substrate 11. And a heat radiating plate (heat radiating member) 14, and these are configured to be held by the holder 13.

以下の説明では、図２〜図５等に示す光源基板１１の長尺方向をＹ方向、短尺方向をＺ方向、Ｙ方向及びＺ方向に直交する方向をＸ方向とする。また、図２〜図４等に示す光プリントヘッド１００において、放熱板１４の放熱部１４２が延出する側を上側、上側と反対方向を下側とする。本実施形態では、光プリントヘッド１００の光源基板１１から、Ｘ方向下方に向けて光Ｌが出射されるようになっている。即ち、Ｘ方向は、光Ｌの光軸方向と一致する。
なお、図４については、ＳＬＡ１２及びホルダー１３の記載を省略している。 In the following description, the long direction of the light source substrate 11 shown in FIG. 2 to FIG. 5 is the Y direction, the short direction is the Z direction, and the direction orthogonal to the Y direction and the Z direction is the X direction. In the optical print head 100 shown in FIG. 2 to FIG. In the present embodiment, light L is emitted downward from the light source substrate 11 of the optical print head 100 in the X direction. That is, the X direction coincides with the optical axis direction of the light L.
In addition, about FIG. 4, description of SLA12 and the holder 13 is abbreviate | omitted.

光源基板１１は、図５に示すように、略矩形状に形成された基体１１１上に、複数の発光素子１１２が略直線上に１列並べられて構成されている。なお、複数の発光素子１１２を略直線上に短尺方向（Ｚ方向）に沿って複数列（例えば、３列）並べるように構成してもよい。複数の発光素子１１２が複数列並べられる場合は千鳥状に配列され、光源基板１１のＺ方向で発光素子１１２が重ならないように、長尺方向（Ｙ方向）に少しずつずらして配列される。また、本実施形態では、発光素子１１２として、ＯＬＥＤが用いられており、光源基板１１の基体１１１は、線膨張係数の小さいガラスにより形成されている。
なお、光源基板１１のＹ方向の両端部近傍には、発光素子１１２が配列されておらず、光源基板１１のうち当該両端部近傍を除いた部分（図中破線部分）が、複数の発光素子１１２からなる本発明の発光部１１３となっている。 As shown in FIG. 5, the light source substrate 11 is configured by arranging a plurality of light emitting elements 112 in a line on a substantially straight line on a base 111 formed in a substantially rectangular shape. Note that a plurality of light emitting elements 112 may be arranged in a plurality of rows (for example, three rows) along a short direction (Z direction) on a substantially straight line. When a plurality of light emitting elements 112 are arranged in a plurality of rows, the light emitting elements 112 are arranged in a staggered pattern, and are arranged with a slight shift in the longitudinal direction (Y direction) so that the light emitting elements 112 do not overlap in the Z direction of the light source substrate 11. In the present embodiment, an OLED is used as the light emitting element 112, and the base 111 of the light source substrate 11 is formed of glass having a small linear expansion coefficient.
Note that the light emitting elements 112 are not arranged in the vicinity of both ends in the Y direction of the light source substrate 11, and a portion of the light source substrate 11 excluding the vicinity of both ends (broken line portions in the figure) is a plurality of light emitting elements. The light emitting unit 113 of the present invention is composed of 112.

ＳＬＡ１２は、光源基板１１と像担持体２００の間に配置され、複数のロッドレンズが光源基板１１上の複数の発光素子１１２の列方向と略平行に並べられて構成されている。複数のロッドレンズの各々は、中心軸、即ち、光軸での屈折率が低く、中心軸から離れるほど屈折率が高くなるように形成されている。光源基板１１の複数の発光素子１１２から出射された光束は、ＳＬＡ１２の複数のロッドレンズを透過し、像担持体２００の表面上に微小なスポットとして結像されるようになっている。 The SLA 12 is disposed between the light source substrate 11 and the image carrier 200, and is configured such that a plurality of rod lenses are arranged substantially parallel to the column direction of the plurality of light emitting elements 112 on the light source substrate 11. Each of the plurality of rod lenses is formed such that the refractive index at the central axis, that is, the optical axis is low, and the refractive index increases as the distance from the central axis increases. The light beams emitted from the plurality of light emitting elements 112 of the light source substrate 11 pass through the plurality of rod lenses of the SLA 12 and are imaged as fine spots on the surface of the image carrier 200.

ホルダー１３は、液晶ポリマーにより形成され、光源基板１１と、ＳＬＡ１２と、を保持可能に構成されている。液晶ポリマーは、配合する材料を変更することで、光源基板１１の基体１１１の線膨張係数と略同一にすることが可能である。なお、ホルダー１３の材質は、液晶ポリマーに限定されるわけではなく、光源基板１１の基体１１１の線膨張係数と略同一のものであれば好ましい。 The holder 13 is formed of a liquid crystal polymer, and is configured to hold the light source substrate 11 and the SLA 12. The liquid crystal polymer can be made substantially the same as the linear expansion coefficient of the base 111 of the light source substrate 11 by changing the material to be blended. Note that the material of the holder 13 is not limited to the liquid crystal polymer, and it is preferable that the holder 13 is substantially the same as the linear expansion coefficient of the base 111 of the light source substrate 11.

放熱板１４は、光源基板１１の基体１１１と同様、線膨張係数の小さいガラス等を加工して形成され、図３及び図４に示すように、貼り付け部１４１と、放熱部１４２と、を備えて構成されている。なお、放熱板１４は、線膨脹係数の小さい金属を加工して形成されていてもよい。
貼り付け部１４１は、Ｙ方向の長さが発光部１１３のＹ方向の長さよりも長くなるように形成されている。貼り付け部１４１は、光源基板１１の上面、即ち、光放射方向と反対側の面に、貼り付け部１４１のＹ方向の各端部が発光部１１３のＹ方向の各端部よりもＹ方向に外側となるように貼り付けられている。なお、光源基板１１と貼り付け部１４１とを固定する方法としては、例えば、接着する方法や弾性部材により押圧する方法などが挙げられる。また、貼り付け部１４１には、光源基板１１のＹ方向に長い開口部１４３が設けられている。開口部１４３は、Ｙ方向の中央部が最も幅狭となるように形成され、Ｙ方向の各端部側に向かうにつれて徐々に幅広となるように形成されている。即ち、開口部１４３は、Ｙ方向の各端部の開口幅ｈ１よりも中央部の開口幅ｈ２の方が小さくなっている。なお、開口部１４３は、発光部１１３よりもＹ方向に幅広となるように形成されている。従って、光源基板１１と放熱板１４の貼り付け部１４１との接触面の面積は、発光部１１３のＹ方向の各端部よりも中央部の方が大きくなっている。
放熱部１４２は、貼り付け部１４１のＺ方向の各端部から上方に延出するように形成されている。 The heat radiating plate 14 is formed by processing glass or the like having a small linear expansion coefficient, similar to the base 111 of the light source substrate 11, and as shown in FIGS. 3 and 4, the pasting portion 141 and the heat radiating portion 142 are provided. It is prepared for. In addition, the heat sink 14 may be formed by processing a metal having a small linear expansion coefficient.
The affixing portion 141 is formed so that the length in the Y direction is longer than the length in the Y direction of the light emitting portion 113. The affixing part 141 is on the upper surface of the light source substrate 11, that is, the surface opposite to the light emission direction, and the Y-direction end of the affixing part 141 is more in the Y-direction than the Y-direction end parts of the light-emitting part 113. It is affixed to the outside. In addition, as a method of fixing the light source substrate 11 and the attaching part 141, the method of adhering, the method of pressing with an elastic member, etc. are mentioned, for example. The pasting portion 141 is provided with an opening 143 that is long in the Y direction of the light source substrate 11. The opening 143 is formed so that the central portion in the Y direction is the narrowest, and is formed so as to gradually become wider toward each end in the Y direction. In other words, the opening 143 has a smaller opening width h2 at the center than the opening width h1 at each end in the Y direction. Note that the opening 143 is formed to be wider in the Y direction than the light emitting unit 113. Therefore, the area of the contact surface between the light source substrate 11 and the attaching portion 141 of the heat radiating plate 14 is larger at the central portion than at each end portion of the light emitting portion 113 in the Y direction.
The heat radiating part 142 is formed to extend upward from each end of the attaching part 141 in the Z direction.

次に、本実施形態に係る光プリントヘッド１００の作用について説明する。
本実施形態に係る光プリントヘッド１００によれば、光源基板１１に備えられた複数の発光素子１１２から出射された光Ｌが、ＳＬＡ１２を透過して、像担持体２００の表面上に微小なスポットとして結像される。
このとき、複数の発光素子１１２は、光Ｌの出射に伴い発熱することとなる。本実施形態では、光源基板１１の上面に放熱板１４が貼り付けられているため、この放熱板１４を介して複数の発光素子１１２が発した熱を放熱することができる。
ここで、光源基板１１にはＹ方向に沿って複数の発光素子１１２が配列されているため、各発光素子１１２の発光時間が同一の場合でも、光源基板１１のＹ方向の両端部よりも中央部の方が高温となり、温度ムラが発生する。これは、光源基板１１のＹ方向の両端部は構造上周囲の温度の影響を受けにくいために放熱し易く、Ｙ方向の中央部は周囲の温度の影響を受けるために温度が上昇し易いからである。
本実施形態では、放熱板１４の光源基板１１に貼り付けられる面（貼り付け部１４１）に、Ｙ方向に長い開口部１４３を設けるようにしている。開口部１４３は、Ｙ方向の中央部が最も幅狭となるように形成され、Ｙ方向の各端部側に向かうにつれて徐々に幅広となるように形成されているので、光源基板１１と放熱板１４の貼り付け部１４１との接触面の面積は、発光部１１３のＹ方向の各端部よりも中央部の方が大きくなっている。即ち、発光部１１３のＹ方向の各端部と比べて、より高温となる中央部の接触面積を大きくしているので、端部よりも中央部の放熱効率を高めることができる。
特に、本実施形態では、光源基板１１と貼り付け部１４１との接触面の面積が、発光部１１３のＹ方向の各端部から中央部に向かうにつれて徐々に大きくなっている。従って、光源基板１１の長尺方向の放熱効率を光源基板１１の長尺方向の温度ムラに対応させることができる。 Next, the operation of the optical print head 100 according to this embodiment will be described.
According to the optical print head 100 according to the present embodiment, the light L emitted from the plurality of light emitting elements 112 provided on the light source substrate 11 passes through the SLA 12 and is a minute spot on the surface of the image carrier 200. Is imaged.
At this time, the plurality of light emitting elements 112 generate heat as the light L is emitted. In the present embodiment, since the heat radiating plate 14 is attached to the upper surface of the light source substrate 11, heat generated by the plurality of light emitting elements 112 can be radiated through the heat radiating plate 14.
Here, since a plurality of light emitting elements 112 are arranged along the Y direction on the light source substrate 11, even if the light emission times of the respective light emitting elements 112 are the same, the light source substrate 11 is centered with respect to both ends in the Y direction. The temperature of the part becomes higher and temperature unevenness occurs. This is because both ends of the light source substrate 11 in the Y direction are not easily affected by the ambient temperature because of the structure, and heat is easily radiated, and the central portion in the Y direction is easily affected by the ambient temperature, and the temperature is likely to rise. It is.
In the present embodiment, an opening 143 that is long in the Y direction is provided on the surface (the pasting portion 141) that is pasted on the light source substrate 11 of the heat radiating plate 14. Since the opening 143 is formed so that the central portion in the Y direction is the narrowest and gradually widens toward each end in the Y direction, the light source substrate 11 and the heat sink The area of the contact surface with the 14 affixing part 141 is larger in the central part than each end part in the Y direction of the light emitting part 113. That is, since the contact area of the central part that is higher in temperature is larger than each end part of the light emitting part 113 in the Y direction, the heat radiation efficiency of the central part can be increased more than the end part.
In particular, in the present embodiment, the area of the contact surface between the light source substrate 11 and the pasting portion 141 gradually increases from each end portion in the Y direction of the light emitting portion 113 toward the central portion. Therefore, the heat dissipation efficiency in the longitudinal direction of the light source substrate 11 can be made to correspond to the temperature unevenness in the longitudinal direction of the light source substrate 11.

以上のように、本実施形態に係る光プリントヘッド１００は、複数の発光素子１１２からなる発光部１１３を備える光源基板１１と、発光素子１１２から出射された光を像担持体２００上に集光させるＳＬＡ１２と、光源基板１１に貼り付けられた放熱板１４と、を備える。また、光源基板１１及び放熱板１４は、光放射方向に垂直な平面においてＹ方向と当該Ｙ方向に直交するＺ方向に延在し、発光部１１３は、光源基板１１のＹ方向に延在する。また、放熱板１４は、Ｙ方向の長さが発光部１１３のＹ方向の長さよりも長くなるように形成されるとともに、当該放熱板１４のＹ方向の各端部が発光部１１３のＹ方向の各端部よりも外側となるように貼り付けられ、光源基板１１と放熱板１４との接触面の面積は、発光部１１３のＹ方向の各端部よりも中央部の方が大きい。
即ち、光源基板１１と放熱板１４との接触面の面積に関して、発光部１１３のＹ方向の各端部と比べてより高温となる中央部の接触面積を大きくしているので、中央部での放熱効率を高めることができ、簡易且つ安価な構成で光源基板１１に生じる温度ムラを低減することができる。 As described above, the optical print head 100 according to this embodiment condenses the light source substrate 11 including the light emitting unit 113 including the plurality of light emitting elements 112 and the light emitted from the light emitting elements 112 on the image carrier 200. SLA12 to be made and a heat sink 14 affixed to the light source substrate 11. The light source substrate 11 and the heat radiating plate 14 extend in the Y direction and the Z direction orthogonal to the Y direction on a plane perpendicular to the light emission direction, and the light emitting unit 113 extends in the Y direction of the light source substrate 11. . The heat sink 14 is formed such that the length in the Y direction is longer than the length in the Y direction of the light emitting unit 113, and each end of the heat sink 14 in the Y direction is in the Y direction of the light emitting unit 113. The area of the contact surface between the light source substrate 11 and the heat radiating plate 14 is larger at the central portion than at the respective end portions in the Y direction of the light emitting unit 113.
That is, with respect to the area of the contact surface between the light source substrate 11 and the heat radiating plate 14, the contact area of the central portion where the temperature is higher than that of each end portion in the Y direction of the light emitting portion 113 is increased. The heat dissipation efficiency can be increased, and temperature unevenness generated in the light source substrate 11 can be reduced with a simple and inexpensive configuration.

特に、本実施形態に係る光プリントヘッド１００は、光源基板１１と放熱板１４との接触面の面積が、発光部１１３のＹ方向の各端部から中央部に向かうにつれて徐々に大きくなっている。従って、光源基板１１に発生する温度ムラに即した形での放熱効率とすることができるので、精度よく温度ムラを低減することができる。 In particular, in the optical print head 100 according to the present embodiment, the area of the contact surface between the light source substrate 11 and the heat radiating plate 14 is gradually increased from each end in the Y direction of the light emitting unit 113 toward the center. . Therefore, since the heat radiation efficiency can be achieved in a form that conforms to the temperature unevenness generated in the light source substrate 11, the temperature unevenness can be accurately reduced.

以上、本発明に係る実施形態に基づいて具体的に説明したが、本発明は上記実施形態に限定されるものではなく、その要旨を逸脱しない範囲で変更可能である。 As mentioned above, although concretely demonstrated based on embodiment which concerns on this invention, this invention is not limited to the said embodiment, It can change in the range which does not deviate from the summary.

（変形例１）
例えば、図６に示す例では、実施形態と比べ、放熱板１４の構造が異なっている。なお、説明の簡略化のため、実施形態と同様の構成については、同一の符号を付して、その詳細な説明を省略する。
具体的には、変形例１に係る光プリントヘッド１００ａの放熱板１４ａは、図６に示すように、貼り付け部１４１ａと、放熱部１４２と、を備えて構成されている。
貼り付け部１４１ａは、光源基板１１の上面、即ち、光放射方向と反対側の面に貼り付けられている。また、貼り付け部１４１ａには、光源基板１１のＹ方向に長く、中央部で貼り付け部１４１ａの短尺方向に連結された連結部１４４ａを有することにより、二つに分割された開口部１４４、１４４が設けられている。連結部１４４ａは、貼り付け部１４１ａにおいて光源基板１１に接触し且つＺ方向の各端部にそれぞれ配置される第１部１４４ｂ及び第２部１４４ｃを連結させる。貼り付け部１４１ａのＹ方向の両端部は、開口部１４４に即して開放されている。開口部１４４は、光源基板１１のＹ方向の中央部側が最も幅狭となるように形成され、光源基板１１のＹ方向の各端部側に向かうにつれて徐々に幅広となるように形成されている。即ち、開口部１４４は、光源基板１１のＹ方向の各端部の開口幅ｈ３よりも中央部の開口幅ｈ４の方が小さくなっている。従って、光源基板１１と放熱板１４ａの貼り付け部１４１ａとの接触面の面積は、発光部１１３のＹ方向の各端部よりも中央部の方が大きくなっている。 (Modification 1)
For example, in the example shown in FIG. 6, the structure of the heat sink 14 is different from that of the embodiment. For simplification of description, the same reference numerals are given to the same configurations as those in the embodiment, and detailed description thereof is omitted.
Specifically, as shown in FIG. 6, the heat radiating plate 14a of the optical print head 100a according to the modified example 1 includes a pasting portion 141a and a heat radiating portion 142.
The affixing portion 141a is affixed to the upper surface of the light source substrate 11, that is, the surface opposite to the light emission direction. In addition, the pasting portion 141a has a connecting portion 144a that is long in the Y direction of the light source substrate 11 and is connected to the short direction of the pasting portion 141a at the center portion, so that the opening 144 divided into two parts, 144 is provided. The connecting portion 144a connects the first portion 144b and the second portion 144c, which are in contact with the light source substrate 11 in the attaching portion 141a and are disposed at the respective end portions in the Z direction. Both end portions in the Y direction of the pasting portion 141a are opened in conformity with the opening portion 144. The opening 144 is formed so that the central portion side in the Y direction of the light source substrate 11 is the narrowest, and is formed so as to gradually become wider toward each end portion side of the light source substrate 11 in the Y direction. . That is, the opening 144 has a smaller opening width h4 at the center than the opening width h3 at each end of the light source substrate 11 in the Y direction. Therefore, the area of the contact surface between the light source substrate 11 and the attaching portion 141a of the heat radiating plate 14a is larger at the center portion than at each end portion in the Y direction of the light emitting portion 113.

以上のように、変形例１に係る光プリントヘッド１００ａによれば、実施形態と同様の効果を得られる他、貼り付け部１４１ａのＹ方向の両端部が、開口部１４４に即して開放されているので、光源基板１１のＹ方向の両端部近傍にまで発光素子１１２が配列されている場合であっても、温度ムラを低減することができる。 As described above, according to the optical print head 100a according to the first modification, the same effect as that of the embodiment can be obtained, and both end portions in the Y direction of the pasting portion 141a are opened in conformity with the opening portion 144. Therefore, even when the light emitting elements 112 are arranged in the vicinity of both ends of the light source substrate 11 in the Y direction, temperature unevenness can be reduced.

（変形例２）
また、図７に示す例では、実施形態と比べ、放熱板１４の構造が異なっている。なお、説明の簡略化のため、実施形態と同様の構成については、同一の符号を付して、その詳細な説明を省略する。
具体的には、変形例２に係る光プリントヘッド１００ｂの放熱板１４ｂは、図７に示すように、平面視略ひし形形状に形成され、上下方向（Ｘ方向）に厚みを持たせている。放熱板１４ｂは、光源基板１１の上面、即ち、光放射方向と反対側の面に貼り付けられている。放熱板１４ｂは、Ｙ方向の中央部側が最も幅広となるように形成され、Ｙ方向の各端部側に向かうにつれて徐々に幅狭となるように形成されている。即ち、放熱板１４ｂは、Ｙ方向の各端部の幅ｈ５よりも中央部の幅ｈ６の方が大きくなっている。従って、光源基板１１と放熱板１４ｂとの接触面の面積は、発光部１１３のＹ方向の各端部よりも中央部の方が大きくなっている。 (Modification 2)
Moreover, in the example shown in FIG. 7, compared with embodiment, the structure of the heat sink 14 is different. For simplification of description, the same reference numerals are given to the same configurations as those in the embodiment, and detailed description thereof is omitted.
Specifically, as shown in FIG. 7, the heat radiating plate 14b of the optical print head 100b according to the modified example 2 is formed in a substantially rhombus shape in plan view and has a thickness in the vertical direction (X direction). The heat sink 14b is affixed to the upper surface of the light source substrate 11, that is, the surface opposite to the light emission direction. The heat radiating plate 14b is formed so that the central part side in the Y direction becomes the widest, and is formed so as to gradually become narrower toward each end part side in the Y direction. That is, the heat sink 14b has a width h6 at the center portion larger than a width h5 at each end portion in the Y direction. Therefore, the area of the contact surface between the light source substrate 11 and the heat radiating plate 14b is larger in the central portion than in the Y direction end portions of the light emitting portion 113.

以上のように、変形例２に係る光プリントヘッド１００ｂによれば、実施形態と同様の効果を得られる他、放熱板１４ｂの形状が単純であるため、放熱板１４ｂを形成する際の加工がし易く、作業時間及びコストをより削減することができる。 As described above, according to the optical print head 100b according to the modified example 2, the same effect as that of the embodiment can be obtained, and the shape of the heat sink 14b is simple, so that the processing when forming the heat sink 14b is performed. It is easy to do and can reduce work time and cost more.

（変形例３）
また、図８に示す例では、実施形態と比べ、放熱板１４の構造が異なっている。なお、説明の簡略化のため、実施形態と同様の構成については、同一の符号を付して、その詳細な説明を省略する。
具体的には、変形例３に係る光プリントヘッド１００ｃの放熱板１４ｃは、図８に示すように、貼り付け部１４１ｃと、放熱部１４２と、を備えて構成されている。
貼り付け部１４１ｃは、光源基板１１の上面、即ち、光放射方向と反対側の面に貼り付けられている。また、貼り付け部１４１ｃには、同一形状の開口部１４５が複数設けられている。開口部１４５は、Ｙ方向に沿って略直線上に、Ｚ方向に３列に並べられて配置されている。開口部１４５は、Ｙ方向に隣接する開口部１４５間の間隔に関して、貼り付け部１４１ｃのＹ方向の各端部側に設けられた開口部１４５間の間隔ｈ７よりも中央部に設けられた開口部１４５間の間隔ｈ８の方が広くなっている。従って、光源基板１１と放熱板１４ｃの貼り付け部１４１ｃとの接触面の面積は、発光部１１３のＹ方向の各端部よりも中央部の方が大きくなっている。また、Ｙ方向に隣接する開口部１４５間の間隔は、貼り付け部１４１のＹ方向の各端部から中央部に向かうにつれて徐々に広くなっている。 (Modification 3)
Moreover, in the example shown in FIG. 8, the structure of the heat sink 14 differs compared with embodiment. For simplification of description, the same reference numerals are given to the same configurations as those in the embodiment, and detailed description thereof is omitted.
Specifically, as shown in FIG. 8, the heat radiating plate 14c of the optical print head 100c according to the modified example 3 includes a pasting portion 141c and a heat radiating portion 142.
The affixing portion 141c is affixed to the upper surface of the light source substrate 11, that is, the surface opposite to the light emission direction. The pasting part 141c is provided with a plurality of openings 145 having the same shape. The openings 145 are arranged in three rows in the Z direction on a substantially straight line along the Y direction. The opening 145 is an opening provided in the center portion with respect to the interval between the opening portions 145 adjacent in the Y direction rather than the interval h7 between the opening portions 145 provided on each end side in the Y direction of the pasting portion 141c. The interval h8 between the portions 145 is wider. Therefore, the area of the contact surface between the light source substrate 11 and the attaching portion 141c of the heat radiating plate 14c is larger in the central portion than in the Y direction ends of the light emitting portion 113. Moreover, the space | interval between the opening parts 145 adjacent to a Y direction is gradually widened as it goes to the center part from each edge part of the Y direction of the sticking part 141. FIG.

以上のように、変形例３に係る光プリントヘッド１００ｃによれば、放熱板１４ｃの光源基板１１に貼り付けられる面には、Ｙ方向に沿って同一形状の開口部１４５が複数設けられている。また、Ｙ方向に隣接する開口部１４５間の間隔は、放熱板１４ｃのＹ方向の各端部側に設けられた開口部１４５間の間隔ｈ７よりも中央部に設けられた開口部１４５間の間隔ｈ８の方が広くなっている。
従って、実施形態と同様の効果を得られる他、貼り付け部１４１ｃに設けられる開口部１４５の総面積を小さくすることができるので、放熱板１４ｃの強度を高めることができる。
なお、変形例３では、開口部１４５がＺ方向に３列に並べられて配置されている構成を例示して説明しているが、これに限定されるものではない。例えば、開口部１４５がＺ方向に２列、或いは４列以上配置されている構成としてもよい。 As described above, according to the optical print head 100c according to the modified example 3, a plurality of openings 145 having the same shape are provided along the Y direction on the surface attached to the light source substrate 11 of the heat radiating plate 14c. . Moreover, the space | interval between the opening parts 145 adjacent to a Y direction is between the opening parts 145 provided in the center part rather than the space | interval h7 between the opening parts 145 provided in each edge part side of the Y direction of the heat sink 14c. The interval h8 is wider.
Therefore, the same effect as the embodiment can be obtained, and the total area of the opening 145 provided in the pasting portion 141c can be reduced, so that the strength of the heat radiating plate 14c can be increased.
In the third modification, the configuration in which the openings 145 are arranged in three rows in the Z direction is described as an example, but the present invention is not limited to this. For example, the openings 145 may be arranged in two rows or four or more rows in the Z direction.

（変形例４）
また、図９に示す例では、変形例３の放熱板１４ｃと比べ、開口部１４５の形状が異なっている。なお、説明の簡略化のため、変形例３と同様の構成については、同一の符号を付して、その詳細な説明を省略する。
具体的には、変形例４に係る光プリントヘッド１００ｄの放熱板１４ｄは、図９に示すように、貼り付け部１４１ｄと、放熱部１４２と、を備えて構成され、貼り付け部１４１ｄには、同一形状の開口部１４６が複数設けられている。開口部１４６は、Ｚ方向に長い略楕円形状に形成され、Ｙ方向に沿って１列に並べられて配置されている。開口部１４６は、Ｙ方向に隣接する開口部１４６間の間隔に関して、貼り付け部１４１ｄのＹ方向の各端部側に設けられた開口部１４６間の間隔ｈ９よりも中央部に設けられた開口部１４６間の間隔ｈ１０の方が広くなっている。従って、光源基板１１と放熱板１４ｄの貼り付け部１４１ｄとの接触面の面積は、発光部１１３のＹ方向の各端部よりも中央部の方が大きくなっている。また、Ｙ方向に隣接する開口部１４６間の間隔は、貼り付け部１４１ｄのＹ方向の各端部から中央部に向かうにつれて徐々に広くなっている。 (Modification 4)
In the example shown in FIG. 9, the shape of the opening 145 is different from that of the heat radiating plate 14 c of the third modification. For simplification of description, the same reference numerals are given to the same configurations as those of Modification 3, and the detailed description thereof is omitted.
Specifically, as shown in FIG. 9, the heat radiating plate 14 d of the optical print head 100 d according to the modification 4 includes a pasting portion 141 d and a heat radiating portion 142, and the pasting portion 141 d includes A plurality of openings 146 having the same shape are provided. The openings 146 are formed in a substantially elliptical shape that is long in the Z direction, and are arranged in a line along the Y direction. The opening 146 is an opening provided at the center portion with respect to the interval between the opening portions 146 adjacent in the Y direction rather than the interval h9 between the opening portions 146 provided on each end side in the Y direction of the pasting portion 141d. The interval h10 between the portions 146 is wider. Therefore, the area of the contact surface between the light source substrate 11 and the attaching portion 141d of the heat radiating plate 14d is larger at the center portion than at each end portion of the light emitting portion 113 in the Y direction. Moreover, the space | interval between the opening parts 146 adjacent to a Y direction becomes large gradually as it goes to the center part from each edge part of the Y direction of the adhesion part 141d.

以上のように、変形例４に係る光プリントヘッド１００ｄによれば、実施形態と同様の効果を得られる他、貼り付け部１４１ｄに設けられる開口部１４６の総面積を小さくすることができるので、放熱板１４ｄの強度を高めることができる。 As described above, according to the optical print head 100d according to the modified example 4, the same effect as that of the embodiment can be obtained, and the total area of the opening 146 provided in the pasting portion 141d can be reduced. The strength of the heat sink 14d can be increased.

（変形例５）
また、図１０に示す例では、実施形態と比べ、放熱板１４の構造が異なっている。なお、説明の簡略化のため、実施形態と同様の構成については、同一の符号を付して、その詳細な説明を省略する。
具体的には、変形例５に係る光プリントヘッド１００ｅの放熱板１４ｅは、図１０に示すように、貼り付け部１４１ｅと、放熱部１４２と、を備えて構成され、貼り付け部１４１ｅには、複数の開口部１４７が設けられている。開口部１４７は、Ｙ方向に沿って略直線上に、Ｚ方向に３列に並べられて配置されている。Ｙ方向に隣接する開口部１４７間の間隔は全て等間隔となっており、貼り付け部１４１ｅのＹ方向の各端部側に設けられた開口部１４７間の間隔ｈ１１と中央部に設けられた開口部１４７間の間隔ｈ１２も等間隔となっている。また、開口部１４７は、貼り付け部１４１ｅのＹ方向の各端部側に設けられた開口部１４７の開口幅ｈ１３よりも中央部に設けられた開口部１４７の開口幅ｈ１４の方が小さくなっている。従って、光源基板１１と放熱板１４ｅの貼り付け部１４１ｅとの接触面の面積は、発光部１１３のＹ方向の各端部よりも中央部の方が大きくなっている。また、開口部１４７の開口幅は、貼り付け部１４１ｅのＹ方向の各端部から中央部に向かうにつれて徐々に小さくなっている。 (Modification 5)
Moreover, in the example shown in FIG. 10, the structure of the heat sink 14 differs compared with embodiment. For simplification of description, the same reference numerals are given to the same configurations as those in the embodiment, and detailed description thereof is omitted.
Specifically, as shown in FIG. 10, the heat radiating plate 14e of the optical print head 100e according to the modified example 5 includes a pasting portion 141e and a heat radiating portion 142, and the pasting portion 141e includes A plurality of openings 147 are provided. The openings 147 are arranged in three rows in the Z direction on a substantially straight line along the Y direction. The intervals between the openings 147 adjacent in the Y direction are all equal, and are provided at the center and the interval h11 between the openings 147 provided on each end side in the Y direction of the pasting portion 141e. The intervals h12 between the openings 147 are also equal. Moreover, the opening width 147 of the opening part 147 provided in the center part becomes smaller than the opening width h13 of the opening part 147 provided in each edge part side of the Y direction of the bonding part 141e. ing. Therefore, the area of the contact surface between the light source substrate 11 and the attaching portion 141e of the heat radiating plate 14e is larger in the central portion than in the Y-direction end portions of the light emitting portion 113. Moreover, the opening width of the opening part 147 is gradually reduced from each end part in the Y direction of the attaching part 141e toward the center part.

以上のように、変形例５に係る光プリントヘッド１００ｅによれば、放熱板１４ｅの光源基板１１に貼り付けられる面には、Ｙ方向に沿って開口部１４７が複数設けられている。また、放熱板１４ｅのＹ方向の各端部側に設けられた開口部１４７の開口幅ｈ１３よりも中央部に設けられた開口部１４７の開口幅ｈ１４の方が小さくなっている。
従って、実施形態と同様の効果を得られる他、貼り付け部１４１ｅに設けられる開口部１４７の総面積を小さくすることができるので、放熱板１４ｅの強度を高めることができる。
なお、変形例５では、開口部１４７がＺ方向に３列に並べられて配置されている構成を例示して説明しているが、これに限定されるものではない。例えば、開口部１４７がＺ方向に２列、或いは４列以上配置されている構成としてもよい。 As described above, according to the optical print head 100e according to the modified example 5, the surface of the heat radiating plate 14e attached to the light source substrate 11 is provided with a plurality of openings 147 along the Y direction. Further, the opening width h14 of the opening 147 provided in the center is smaller than the opening width h13 of the opening 147 provided on each end side in the Y direction of the heat radiating plate 14e.
Therefore, the same effect as the embodiment can be obtained, and the total area of the opening 147 provided in the attaching portion 141e can be reduced, so that the strength of the heat radiating plate 14e can be increased.
In addition, although the modification 5 has illustrated and demonstrated the structure by which the opening part 147 is arranged in 3 rows in a Z direction, it is not limited to this. For example, the openings 147 may be arranged in two rows or four or more rows in the Z direction.

（変形例６）
また、図１１に示す例では、変形例５と比べ、放熱板１４ｅの形状及び貼り付け位置が異なっている。なお、説明の簡略化のため、変形例５と同様の構成については、同一の符号を付して、その詳細な説明を省略する。なお、変形例６では、光源基板１１に複数の発光素子１１２が、Ｙ方向に沿って略直線上に、Ｚ方向に３列に並べられて配置されているものとする。
具体的には、変形例６に係る光プリントヘッド１００ｆの放熱板１４ｆは、図１１に示すように、略矩形状の板状部材であり、光源基板１１の下面、即ち、光が出射される側の面に貼り付けられている。放熱板１４ｆには、複数の開口部１４７が設けられている。開口部１４７は、発光素子１１２が配置された位置に対応するように、Ｙ方向に沿って略直線上に、Ｚ方向に３列に並べられて配置されている。従って、発光素子１１２から出射された光Ｌは、開口部１４７を通過する。Ｙ方向に隣接する開口部１４７間の間隔は、全て等間隔となっている。また、開口部１４７は、放熱板１４ｆのＹ方向の各端部側に設けられた開口部１４７の開口幅よりも中央部に設けられた開口部１４７の開口幅の方が小さくなっている。従って、光源基板１１と放熱板１４ｆとの接触面の面積は、発光部１１３のＹ方向の各端部よりも中央部の方が大きくなっている。また、開口部１４７の開口幅は、放熱板１４のＹ方向の各端部から中央部に向かうにつれて徐々に小さくなっている。
なお、変形例６では、図１１に示すように、放熱板１４ｆに放熱部１４２を設けない構成を例示して説明しているが、これに限定されるものではなく、放熱部１４２を設ける構成とすることも可能である。 (Modification 6)
Moreover, in the example shown in FIG. 11, compared with the modification 5, the shape and the affixing position of the heat sink 14e are different. For the sake of simplification of description, the same reference numerals are given to the same configurations as those of the modified example 5, and the detailed description thereof is omitted. In Modification 6, it is assumed that a plurality of light emitting elements 112 are arranged on the light source substrate 11 in three rows in the Z direction on a substantially straight line along the Y direction.
Specifically, the heat radiating plate 14f of the optical print head 100f according to the modification 6 is a substantially rectangular plate-shaped member as shown in FIG. 11, and the lower surface of the light source substrate 11, that is, light is emitted. Affixed to the side surface. A plurality of openings 147 are provided in the heat radiating plate 14f. The openings 147 are arranged in three rows in the Z direction on a substantially straight line along the Y direction so as to correspond to the positions where the light emitting elements 112 are arranged. Accordingly, the light L emitted from the light emitting element 112 passes through the opening 147. The intervals between the openings 147 adjacent in the Y direction are all equal. Moreover, the opening width of the opening part 147 provided in the center part is smaller than the opening width of the opening part 147 provided in each edge part side of the Y direction of the heat sink 14f. Therefore, the area of the contact surface between the light source substrate 11 and the heat radiating plate 14f is larger in the central portion than in the Y direction end portions of the light emitting portion 113. In addition, the opening width of the opening 147 gradually decreases from the respective end portions in the Y direction of the heat radiating plate 14 toward the central portion.
In the sixth modification, as illustrated in FIG. 11, the configuration in which the heat radiating portion 142 is not provided on the heat radiating plate 14 f is described as an example. However, the configuration is not limited thereto, and the configuration in which the heat radiating portion 142 is provided. It is also possible.

以上のように、変形例６に係る光プリントヘッド１００ｆによれば、複数の発光素子１１２は、開口部１４７の位置に合わせて光源基板１１上に配置され、放熱板１４ｆは、光源基板１１の光Ｌが出射される側の面に貼り付けられている。
従って、変形例５と同様の効果を得られる他、放熱板１４ｆの配置自由度を高めることができる。また、光源基板１１の発光素子１１２に対してより近接している側の面に貼り付けられるので、放熱効率を高めることができる。 As described above, according to the optical print head 100f according to the modified example 6, the plurality of light emitting elements 112 are arranged on the light source substrate 11 in accordance with the position of the opening 147, and the heat radiating plate 14f is It is affixed on the surface where the light L is emitted.
Therefore, the same effect as that of the modified example 5 can be obtained, and the degree of freedom of arrangement of the heat sink 14f can be increased. Moreover, since it affixes on the surface of the light source substrate 11 which is closer to the light emitting element 112, the heat radiation efficiency can be improved.

（変形例７）
また、図１２に示す例では、変形例６の光源基板１１と比べ、発光素子１１２の配置構成が異なっている。なお、説明の簡略化のため、変形例６と同様の構成については、同一の符号を付して、その詳細な説明を省略する。
具体的には、変形例７に係る光プリントヘッド１００ｇの放熱板１４ｇは、図１２に示すように、光源基板１１の光が出射される側の面に貼り付けられるとともに、複数の開口部１４７が設けられている。そして、変形例７に示す例では、一の開口部１４７に対して、Ｙ方向に５列、Ｚ方向に５列の計２５個の発光素子１１２からなる一の発光素子群１１２Ａが配置されている。従って、発光素子群１１２Ａから出射された光Ｌは、開口部１４７を通過する。なお、発光素子群１１２Ａを構成する発光素子１１２の数は、上記例（２５個）に限られるものではなく、出射される光が開口部１４７を通過可能であればいかなる数で構成されていてもよい。 (Modification 7)
In the example shown in FIG. 12, the arrangement configuration of the light emitting elements 112 is different from that of the light source substrate 11 of the modified example 6. For simplification of description, the same reference numerals are given to the same configurations as those of the modification 6 and detailed description thereof is omitted.
Specifically, as shown in FIG. 12, the heat radiating plate 14 g of the optical print head 100 g according to the modified example 7 is attached to the surface of the light source substrate 11 where light is emitted, and a plurality of openings 147. Is provided. In the example shown in the modified example 7, one light emitting element group 112A composed of a total of 25 light emitting elements 112 in five rows in the Y direction and five rows in the Z direction is arranged for one opening 147. Yes. Accordingly, the light L emitted from the light emitting element group 112A passes through the opening 147. Note that the number of the light emitting elements 112 constituting the light emitting element group 112A is not limited to the above example (25), and may be any number as long as the emitted light can pass through the opening 147. Also good.

以上のように、変形例７に係る光プリントヘッド１００ｇによれば、一の開口部１４７に対して、複数の発光素子１１２からなる一の発光素子群１１２Ａが配置されている。
従って、変形例６と同様の効果を得られる他、発光素子１１２の配置自由度を高めることができる。 As described above, according to the optical print head 100g according to the modified example 7, one light emitting element group 112A including the plurality of light emitting elements 112 is arranged in one opening 147.
Therefore, in addition to obtaining the same effect as that of the sixth modification, the degree of freedom in arranging the light emitting elements 112 can be increased.

（変形例８）
また、図１３に示す例では、変形例７と比べ、放熱板１４ｇの貼り付け位置及び開口部１４７の配置構成が異なっている。なお、説明の簡略化のため、変形例７と同様の構成については、同一の符号を付して、その詳細な説明を省略する。
具体的には、変形例８に係る光プリントヘッド１００ｈの放熱板１４ｈは、図１３に示すように、光源基板１１の上面、即ち、光放射方向と反対側の面に貼り付けられるとともに、複数の開口部１４８が設けられている。開口部１４８は、Ｙ方向に５列、Ｚ方向に５列の計２５個の発光素子１１２からなる発光素子群１１２Ａが配置された位置とＸ方向で、即ち、光源基板１１の放熱板１４ｈが貼り付けられる面の法線方向で重ならないように、Ｙ方向に沿って略直線上に、Ｚ方向に２列に並べられて配置されている。Ｙ方向に隣接する開口部１４８間の間隔は、全て等間隔となっている。また、開口部１４８は、放熱板１４ｈのＹ方向の各端部側に設けられた開口部１４８の開口幅よりも中央部に設けられた開口部１４８の開口幅の方が小さくなっている。従って、光源基板１１と放熱板１４ｈとの接触面の面積は、発光部１１３のＹ方向の各端部よりも中央部の方が大きくなっている。また、開口部１４８の開口幅は、放熱板１４ｈのＹ方向の各端部から中央部に向かうにつれて徐々に小さくなっている。
なお、変形例８では、開口部１４８が、複数の発光素子１１２からなる発光素子群１１２Ａが配置された位置とＸ方向で重ならないように配置された構成を例示して説明しているが、これに限定されるものではなく、発光素子群１１２Ａの代わりに一の発光素子１１２を配置する構成とすることも可能である。 (Modification 8)
Moreover, in the example shown in FIG. 13, compared with the modification 7, the affixing position of the heat sink 14g and the arrangement configuration of the opening 147 are different. For simplification of description, the same reference numerals are given to the same configurations as those of the modified example 7, and the detailed description thereof is omitted.
Specifically, as shown in FIG. 13, the heat radiating plate 14 h of the optical print head 100 h according to the modification 8 is attached to the upper surface of the light source substrate 11, that is, the surface opposite to the light emission direction. The opening 148 is provided. The openings 148 are located in the X direction and the position where the light emitting element group 112A composed of a total of 25 light emitting elements 112 in five rows in the Y direction and five rows in the Z direction, that is, the heat dissipation plate 14h of the light source substrate 11 is disposed. In order not to overlap in the normal direction of the surface to be pasted, they are arranged in two rows in the Z direction on a substantially straight line along the Y direction. The intervals between the openings 148 adjacent in the Y direction are all equal. Moreover, the opening width of the opening part 148 provided in the center part is smaller than the opening width of the opening part 148 provided in each edge part side of the Y direction of the heat sink 14h. Therefore, the area of the contact surface between the light source substrate 11 and the heat radiating plate 14h is larger in the central portion than in the Y direction end portions of the light emitting portion 113. Further, the opening width of the opening 148 gradually decreases from each end of the heat radiating plate 14h in the Y direction toward the center.
In the modification 8, the opening 148 is described by exemplifying a configuration in which the opening 148 is arranged so as not to overlap the position where the light emitting element group 112A including the plurality of light emitting elements 112 is arranged in the X direction. However, the present invention is not limited to this, and a structure in which one light emitting element 112 is arranged instead of the light emitting element group 112A is also possible.

以上のように、変形例８に係る光プリントヘッド１００ｈによれば、複数の発光素子１１２（発光素子群１１２Ａ）は、開口部１４８の位置と光源基板１１の放熱板１４ｈが貼り付けられる面の法線方向（Ｘ方向）で重ならないように配置されている。
従って、変形例７と同様の効果を得られる他、光源基板１１の発光素子１１２が配置されている位置に放熱板１４ｈを接触させることができるので、放熱効率をより高めることができる。 As described above, according to the optical print head 100h according to the modified example 8, the plurality of light emitting elements 112 (the light emitting element group 112A) have the positions of the openings 148 and the surface to which the heat radiating plate 14h of the light source substrate 11 is attached. They are arranged so that they do not overlap in the normal direction (X direction).
Therefore, in addition to obtaining the same effect as that of the modified example 7, the heat radiation plate 14h can be brought into contact with the position where the light emitting element 112 of the light source substrate 11 is disposed, so that the heat radiation efficiency can be further improved.

なお、上記変形例８では、放熱板１４ｈを光源基板１１の上面に貼り付けるようにしているが、これに限定されるものではない。例えば、発光素子群１１２Ａから出射された光Ｌを透過可能にすべく、放熱板１４ｈを透明な部材で構成するようにすれば、放熱板１４ｈを光源基板１１の下面に貼り付けることも可能である。 In addition, in the said modification 8, although the heat sink 14h is affixed on the upper surface of the light source board | substrate 11, it is not limited to this. For example, if the heat radiating plate 14h is made of a transparent member so that the light L emitted from the light emitting element group 112A can be transmitted, the heat radiating plate 14h can be attached to the lower surface of the light source substrate 11. is there.

（変形例９）
また、図１４に示す例では、実施形態と比べ、放熱板１４の構造及び中間部材１５を備える点が異なっている。なお、説明の簡略化のため、実施形態と同様の構成については、同一の符号を付して、その詳細な説明を省略する。
具体的には、変形例９に係る光プリントヘッド１００ｉの放熱板１４ｉは、図１４（Ａ）に示すように、略矩形状に形成され、中間部材１５を介して、光源基板１１の上面、即ち、光放射方向と反対側の面に載置されている。また、変形例９に係る放熱板１４ｉには、開口部が形成されていない。
中間部材１５は、Ｙ方向の長さが発光部１１３のＹ方向の長さよりも長くなるように形成された略矩形状の板状部材である。中間部材１５は、Ｙ方向の各端部が発光部１１３のＹ方向の各端部よりも外側となるように貼り付けられている。中間部材１５は、図１４（Ｂ）に示すように、中央部１５１と、中央部１５１を囲う内周部１５２と、内周部１５２を囲う外周部１５３と、を備えて構成されている。中央部１５１は、内周部１５２及び外周部１５３と比較して、より熱伝導率が高い材料で形成されている。内周部１５２は、外周部１５３と比較して、より熱伝導率が高い材料で形成されている。即ち、中間部材１５の熱伝導率は、各端部から中央部に向かうにつれて高くなっている。従って、光源基板１１と中間部材１５との接触面の面積は、発光部１１３の各端部よりも中央部の方が大きくなっている。 (Modification 9)
Further, the example shown in FIG. 14 is different from the embodiment in that the structure of the heat radiating plate 14 and the intermediate member 15 are provided. For simplification of description, the same reference numerals are given to the same configurations as those in the embodiment, and detailed description thereof is omitted.
Specifically, as shown in FIG. 14A, the heat radiating plate 14i of the optical print head 100i according to the modification 9 is formed in a substantially rectangular shape, and the upper surface of the light source substrate 11 via the intermediate member 15, That is, it is placed on the surface opposite to the light emission direction. In addition, the heat radiating plate 14 i according to the modification 9 has no opening.
The intermediate member 15 is a substantially rectangular plate-like member formed so that the length in the Y direction is longer than the length in the Y direction of the light emitting unit 113. The intermediate member 15 is affixed so that each end in the Y direction is on the outer side than each end in the Y direction of the light emitting unit 113. As illustrated in FIG. 14B, the intermediate member 15 includes a central portion 151, an inner peripheral portion 152 that surrounds the central portion 151, and an outer peripheral portion 153 that surrounds the inner peripheral portion 152. The central part 151 is formed of a material having higher thermal conductivity than the inner peripheral part 152 and the outer peripheral part 153. The inner peripheral portion 152 is made of a material having higher thermal conductivity than the outer peripheral portion 153. That is, the thermal conductivity of the intermediate member 15 becomes higher from each end toward the center. Therefore, the area of the contact surface between the light source substrate 11 and the intermediate member 15 is larger in the central portion than in each end portion of the light emitting portion 113.

以上のように、変形例９に係る光プリントヘッド１００ｉは、複数の発光素子１１２からなる発光部１１３を備える光源基板１１と、発光素子１１２から出射された光を像担持体２００上に集光させるＳＬＡ１２と、光源基板１１に貼り付けられた放熱板１４ｉと、光源基板１１と放熱板１４ｉとの間に配置される中間部材１５と、を備える。また、光源基板１１、放熱板１４ｉ、及び中間部材１５は、光放射方向に垂直な平面においてＹ方向と当該Ｙ方向に直交するＺ方向に延在し、発光部１１３は、光源基板１１のＹ方向に延在する。また、中間部材１５は、Ｙ方向の長さが発光部１１３のＹ方向の長さよりも長くなるように形成されるとともに、当該中間部材１５のＹ方向の各端部が発光部１１３のＹ方向の各端部よりも外側となるように貼り付けられ、中間部材１５の熱伝導率は、各端部よりも中央部の方が大きい。
即ち、発光部１１３と中間部材１５との接触面に関して、発光部１１３の各端部と比べてより高温となる中央部の熱伝導率を大きくしているので、放熱効率を高めることができ、簡易且つ安価な構成で光源基板１１に生じる温度ムラを低減することができる。 As described above, the optical print head 100 i according to the modification 9 condenses the light source substrate 11 including the light emitting unit 113 including the plurality of light emitting elements 112 and the light emitted from the light emitting elements 112 on the image carrier 200. SLA12 to be performed, a heat sink 14i attached to the light source substrate 11, and an intermediate member 15 disposed between the light source substrate 11 and the heat sink 14i. The light source substrate 11, the heat radiating plate 14 i, and the intermediate member 15 extend in the Y direction and the Z direction orthogonal to the Y direction on a plane perpendicular to the light emission direction. Extend in the direction. The intermediate member 15 is formed such that the length in the Y direction is longer than the length in the Y direction of the light emitting portion 113, and each end portion in the Y direction of the intermediate member 15 is in the Y direction of the light emitting portion 113. The intermediate member 15 has a higher thermal conductivity at the center than at each end.
That is, with respect to the contact surface between the light emitting unit 113 and the intermediate member 15, the heat conductivity of the central portion that is higher than that of each end of the light emitting unit 113 is increased, so that the heat dissipation efficiency can be increased. Temperature unevenness generated in the light source substrate 11 can be reduced with a simple and inexpensive configuration.

（その他の変形例）
例えば、上記実施形態では、略矩形状の光源基板１１を例示して説明しているが、これに限定されるものではない。光源基板１１は、光放射方向に垂直な平面（ＹＺ平面）において長尺方向（Ｙ方向）と当該長尺方向に直交する短尺方向（Ｚ方向）に延在していればよく、例えば、楕円形状であってもよい。
また、放熱板１４や中間部材１５の形状も光源基板１１の形状と同様に、光放射方向に垂直な平面（ＹＺ平面）において長尺方向（Ｙ方向）と当該長尺方向に直交する短尺方向（Ｚ方向）に延在していればよい。
また、上記実施形態では、光源基板１１及びＳＬＡ１２を保持するホルダー１３を備える構成を例示して説明しているが、これに限定されるものではない。即ち、ホルダー１３を備えない構成としてもよい。 (Other variations)
For example, in the above embodiment, the light source substrate 11 having a substantially rectangular shape is described as an example. However, the present invention is not limited to this. The light source substrate 11 only needs to extend in the long direction (Y direction) and the short direction (Z direction) orthogonal to the long direction on a plane (YZ plane) perpendicular to the light emission direction. It may be a shape.
Similarly to the shape of the light source substrate 11, the shape of the heat sink 14 and the intermediate member 15 is also a short direction perpendicular to the long direction (Y direction) and the long direction on a plane perpendicular to the light emission direction (YZ plane). It only needs to extend in the (Z direction).
Moreover, although the said embodiment demonstrated and demonstrated the structure provided with the holder 13 holding the light source board | substrate 11 and SLA12, it is not limited to this. In other words, the holder 13 may not be provided.

その他、光プリントヘッド及び画像形成装置を構成する各装置の細部構成及び各装置の細部動作に関しても、本発明の趣旨を逸脱することのない範囲で適宜変更可能である。 In addition, the detailed configuration of each apparatus constituting the optical print head and the image forming apparatus and the detailed operation of each apparatus can be appropriately changed without departing from the spirit of the present invention.

１０００画像形成装置
１００、１００ａ〜１００ｉ光プリントヘッド（光書込装置）
１１光源基板
１１１基体
１１２発光素子（光源）
１１３発光部
１２ＳＬＡ（光学素子）
１３ホルダー
１４、１４ａ〜１４ｉ放熱板（放熱部材）
１４１、１４１ａ、１４１ｃ〜ｅ貼り付け部
１４２放熱部
１４３〜１４８開口部
１４４ａ連結部
１５中間部材
１５１中央部
１５２内周部
１５３外周部
２００像担持体
２１０帯電部
２２０現像部
３００中間転写ベルト
４００転写ローラー（転写部）
５００定着部 1000 Image forming apparatus 100, 100a to 100i Optical print head (optical writing apparatus)
11 Light source substrate 111 Base body 112 Light emitting element (light source)
113 Light-emitting part 12 SLA (optical element)
13 Holder 14, 14a-14i Heat dissipation plate (heat dissipation member)
141, 141a, 141c-e Pasting part 142 Heat radiation part 143-148 Opening part 144a Connection part 15 Intermediate member 151 Central part 152 Inner peripheral part 153 Outer peripheral part 200 Image carrier 210 Charging part 220 Developing part 300 Intermediate transfer belt 400 Transfer Roller (transfer section)
500 Fixing part

Claims

A light source substrate including a light emitting unit composed of a plurality of light sources ;
A heat radiating member attached to the front Symbol light source substrate,
With
The light source substrate and the heat dissipation member extend in a long direction and a short direction perpendicular to the long direction in a plane perpendicular to the light emission direction,
The light emitting portion extends in the longitudinal direction of the light source substrate,
The heat dissipating member is formed such that the length in the longitudinal direction is longer than the length in the longitudinal direction of the light emitting unit, and each end of the heat dissipating member in the longitudinal direction is the length of the light emitting unit. Pasted to be outside of each end of the direction,
Wherein the heat radiating member, the area of the contact surface between the light source substrate, an opening portion formed towards the size Kunar so the middle than the ends in the longitudinal direction of the light emitting portion is provided An optical writing device.

2. The optical writing device according to claim 1, wherein an area of the contact surface gradually increases from each longitudinal end portion of the light emitting portion toward a central portion.

A plurality of openings having the same shape are provided along the longitudinal direction on the surface of the heat radiating member attached to the light source substrate.
The interval between the openings adjacent to each other in the longitudinal direction is equal to the interval between the openings provided in the central portion rather than the interval between the openings provided on each end side in the longitudinal direction of the heat dissipation member. The optical writing device according to claim 1, wherein the optical writing device is wide.

Wherein the said surface to be pasted on the light source substrate of the heat radiating member, the opening is provided in a plurality along a longitudinal direction,
The opening width of the opening part provided in the center part is smaller than the opening width of the opening part provided in each edge part side of the elongate direction of the said heat radiating member, The Claim 1 or 2 characterized by the above-mentioned. Optical writing device.

The plurality of light sources are arranged on the light source substrate in accordance with the position of the opening,
The optical writing device according to claim 4, wherein the heat radiating member is attached to a surface of the light source substrate on which light is emitted.

5. The optical book according to claim 4, wherein the plurality of light sources are arranged so as not to overlap each other in a normal direction of a surface of the light source substrate to which the heat radiation member is pasted. Device.

A light source substrate including a light emitting unit composed of a plurality of light sources;
  An optical element for condensing the light emitted from the light source on the image carrier;
  A heat dissipation member affixed to the light source substrate;
  With
  The light source substrate and the heat dissipation member extend in a long direction and a short direction perpendicular to the long direction in a plane perpendicular to the light emission direction,
  The light emitting portion extends in the longitudinal direction of the light source substrate,
  The heat dissipating member is formed such that the length in the longitudinal direction is longer than the length in the longitudinal direction of the light emitting unit, and each end of the heat dissipating member in the longitudinal direction is the length of the light emitting unit. Each end of direction
Pasted to the outside,
  A plurality of openings having the same shape are provided along the longitudinal direction on the surface of the heat radiating member to be attached to the light source substrate.
  The interval between the openings adjacent to each other in the longitudinal direction is equal to the interval between the openings provided in the central portion rather than the interval between the openings provided on each end side in the longitudinal direction of the heat dissipation member. An optical writing device characterized by having a wide area.

A light source substrate including a light emitting unit composed of a plurality of light sources;
  An optical element for condensing the light emitted from the light source on the image carrier;
  A heat dissipation member affixed to the light source substrate;
  With
  The light source substrate and the heat dissipating member have a longitudinal direction and the length in a plane perpendicular to the light emitting direction.
Extending in the short direction perpendicular to the scale direction,
  The light emitting portion extends in the longitudinal direction of the light source substrate,
  The heat dissipating member is formed such that the length in the longitudinal direction is longer than the length in the longitudinal direction of the light emitting unit, and each end of the heat dissipating member in the longitudinal direction is the length of the light emitting unit. Pasted to be outside of each end of the direction,
  A plurality of openings are provided along the longitudinal direction on the surface of the heat radiating member to be attached to the light source substrate.
  An optical writing apparatus, wherein an opening width of an opening portion provided in a central portion is smaller than an opening width of an opening portion provided on each end side in the longitudinal direction of the heat dissipation member.

The plurality of light sources are arranged on the light source substrate in accordance with the position of the opening,
The optical writing device according to claim 8, wherein the heat radiating member is attached to a surface of the light source substrate on which light is emitted.

9. The optical book according to claim 8, wherein the plurality of light sources are arranged so as not to overlap each other in the normal direction of the surface of the light source substrate to which the heat radiation member is attached. Device.

A light source substrate including a light emitting unit composed of a plurality of light sources;
An optical element for condensing the light emitted from the light source on the image carrier;
A heat dissipation member affixed to the light source substrate;
An intermediate member disposed between the light source substrate and the heat dissipation member;
With
The light source substrate, the heat radiating member, and the intermediate member extend in a long direction and a short direction perpendicular to the long direction in a plane perpendicular to the light emission direction,
The light emitting portion extends in the longitudinal direction of the light source substrate,
The intermediate member is formed such that the length in the longitudinal direction is longer than the length in the longitudinal direction of the light emitting portion, and each end portion of the intermediate member in the longitudinal direction is the length of the light emitting portion. Pasted to be outside of each end of the direction,
The optical writing apparatus according to claim 1, wherein the intermediate member has a thermal conductivity greater in the center than at each end.

An image carrier;
A charging unit for charging the image carrier;
Optical writing device according to any one of claims 1 to 11 to form an electrostatic latent image on the image bearing member by irradiating light to the charging unit said image bearing member charged by When,
A developing unit that visualizes the electrostatic latent image into an image by a developer by supplying a developer to the image carrier irradiated with the light;
A transfer section for transferring an image formed by the developer onto a recording medium;
A fixing unit that fixes the image of the developer transferred by the transfer unit to the recording medium;
An image forming apparatus comprising: