JP2007322791A - Projector apparatus with automatic focusing function, and automatic focusing method - Google Patents

Projector apparatus with automatic focusing function, and automatic focusing method Download PDF

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JP2007322791A
JP2007322791A JP2006153411A JP2006153411A JP2007322791A JP 2007322791 A JP2007322791 A JP 2007322791A JP 2006153411 A JP2006153411 A JP 2006153411A JP 2006153411 A JP2006153411 A JP 2006153411A JP 2007322791 A JP2007322791 A JP 2007322791A
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Hideaki Azuma
秀明 東
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Sharp NEC Display Solutions Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a projector capable of projecting a focused image on a projecting screen at any time without causing a focal change even when someone shields a space between the projector and the projecting screen, and to provide an automatic focusing method. <P>SOLUTION: Regarding the projector 1 having an automatic focusing function, a distance up to the projecting screen 60 is always measured by a range-finding sensor 31 incorporated in the projector 1, and the focusing of the projection lens 24 is performed by a focusing part 25, and when the projector 1 or the projecting screen 60 is moved, automatic focusing is instantaneously performed again. If someone is about to shield the space between the projector 1 and the projecting screen 60, the someone is detected by a feeling sensor 42 incorporated in the projector 1, then, the focusing is temporarily stopped, consequently, the focused image is projected on the projecting screen 60 at any time even when someone shields the space between the projector 1 and the projecting screen 60. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明はオートフォーカス調整機能を有するプロジェクタと自動焦点調整方法に関し、特に測距センサの人間感知によって生ずるフォーカス調整の誤動作を防止できるプロジェクタと自動焦点調整方法に関する。   The present invention relates to a projector having an autofocus adjustment function and an autofocus adjustment method, and more particularly to a projector and an autofocus adjustment method capable of preventing a focus adjustment malfunction caused by human sensing of a distance measuring sensor.

プロジェクタは、ＤＭＤ（Ｄｉｇｉｔａｌ Ｍｉｃｒｏ−ｍｉｒｒｏｒ Ｄｅｖｉｃｅ）や液晶パネルといった画像形成素子に光源からの光を照射することにより、画像形成素子上に生成した画像を、投写面上に拡大投影する投写型表示装置であり、現在ではホームシアタから業務用のプレゼンテーションにまで幅広く利用されている。   A projector is a projection display device that projects an image generated on an image forming element on a projection plane in an enlarged manner by irradiating light from a light source to the image forming element such as a digital micro-mirror device (DMD) or a liquid crystal panel. Currently, it is widely used from home theater to business presentations.

特に業務用のプレゼンテーションに使用される場合には異なる場所で使用されることが多く、移動のたびに投写面とプロジェクタとの距離が変わることからその都度焦点距離の再調整を行う必要があり、使用者にとってその調整が負担となっていた。   Especially when it is used for business presentations, it is often used in different places, and the distance between the projection surface and the projector changes each time it moves, so it is necessary to readjust the focal length each time. The adjustment was a burden for the user.

その負担を軽減するため、近年プロジェクタに測距センサを設け、投写面との距離を連続的に計測して、投写面との距離に対応させて自動的に投写レンズの焦点の自動調整が行われるオートフォーカス調整機能を有するプロジェクタが使用されるようになってきた。   In order to alleviate this burden, a projector has recently been equipped with a distance measuring sensor, which continuously measures the distance to the projection surface and automatically adjusts the focus of the projection lens according to the distance to the projection surface. Projectors having an autofocus adjustment function have been used.

例えば、特許文献１には、常時は表示用画像の投影により１対のラインセンサが出力する画像信号のレベル差が所定の値以上の場合はその画像信号に基づいて投影レンズのピント調整を行い、所定の値以下の場合はあらかじめ記憶されている所定パターンを有する画像を読み出して投影し１対のラインセンサが出力する画像信号によりピント調整を行うプロジェクタが開示されている。また、特許文献２には、間歇的に自動的な測距動作を行い、得られた測距結果に基づいてピント合わせを行うピント合せの完全な自動化のためのパッシブ型測距装置とプロジェクタが開示されている。
特開２００４−４３８８号公報 特開２００４−２３３１１５号公報 For example, in Patent Document 1, when the level difference between image signals output from a pair of line sensors is always a predetermined value or more by projecting a display image, the projection lens is adjusted based on the image signal. A projector is disclosed that reads and projects an image having a predetermined pattern stored in advance when it is equal to or less than a predetermined value, and performs focus adjustment using an image signal output by a pair of line sensors. Further, Patent Document 2 discloses a passive distance measuring device and a projector for performing complete automatic focusing that intermittently performs automatic ranging operation and performs focusing based on the obtained ranging result. It is disclosed.
Japanese Patent Laid-Open No. 2004-4388 JP 2004-233115 A

オートフォーカス調整機能を有するプロジェクタを用いることによって、投写の位置が変わっても都度焦点の調整を行う必要がなくなり、使用者の負担が軽減して本来のプレゼンテーションにその時間を向けることができるようになった。   By using a projector with an autofocus adjustment function, it is not necessary to adjust the focus each time the projection position changes, so that the burden on the user is reduced and the time can be directed to the original presentation. became.

しかし、オートフォーカス調整機能は、使用者の負担を減らすために、投写中は常に投写面との距離を計測して焦点の自動調整を行うことになっているため、もし人間が投写面の前の距離計測位置に入ると、人間との距離が投写面との距離と誤認され、自動的に投写レンズの焦点距離がその人間との距離に調整されるので、投写面には焦点の合わない映像が投影されるという問題点がある。   However, the autofocus adjustment function is designed to always adjust the focus automatically by measuring the distance from the projection surface during projection in order to reduce the burden on the user. If you enter the distance measurement position, the distance to the person will be mistaken for the distance to the projection surface, and the focal length of the projection lens will be automatically adjusted to the distance to that person. There is a problem that images are projected.

オートフォーカス調整機能を設置の都度使用者が作動させて焦点調整を行った後は機能を休止することとすればこの問題は避けられるが、現在のプロジェクタは非常に多くの機能が要求され、一方使用者には負担をかけない自動化が進められていることから、現在のオートフォーカス調整機能を維持しながら人間が投写光を遮った場合でも投写面には焦点の合った画像が投写されるプロジェクタが要求されている。   This problem can be avoided if the auto focus adjustment function is activated by the user each time it is installed and the function is stopped. However, current projectors require a great number of functions. Since the automation that does not impose a burden on the user is ongoing, a projector that projects a focused image on the projection surface even when a person blocks the projection light while maintaining the current autofocus adjustment function Is required.

本発明の目的は、プロジェクタと投写面との間を人間が遮った場合においても、焦点が変化することなく、常に焦点の合った画像が投写面に投影できるプロジェクタと自動焦点調整方法を提供することにある。   An object of the present invention is to provide a projector and an automatic focus adjustment method capable of always projecting an in-focus image on a projection surface without changing the focus even when a person blocks the projector and the projection surface. There is.

本発明のオートフォーカス調整機能を有するプロジェクタは、
投写面に映像を投写するプロジェクタにおいて、プロジェクタから投写面までの距離を連続的に計測する測距部と、焦点距離が調整可能な投写レンズと、測距部の計測結果に基づいて自動的に投写レンズの焦点距離を調整するフォーカス調整部と、投写面とプロジェクタとの間の人間の所在を感知可能な人感センサと、人感センサが人間の所在を感知したときにフォーカス調整部による投写レンズの焦点距離の調整を中断させる人感制御部と、を備えたことを特徴とする。 The projector having the autofocus adjustment function of the present invention,
In projectors that project images onto the projection surface, a distance measurement unit that continuously measures the distance from the projector to the projection surface, a projection lens that can adjust the focal length, and a measurement result of the distance measurement unit automatically. A focus adjustment unit that adjusts the focal length of the projection lens, a human sensor that can detect the human location between the projection surface and the projector, and a projection by the focus adjustment unit when the human sensor detects the human location And a human presence control unit that interrupts the adjustment of the focal length of the lens.

人感センサが投写面近傍に設けられていてもよく、人感センサには、その人感センサと投写面のプロジェクタからの投写画像の範囲との間の人間の像をその人感センサの入光部に集光できるレンズを有してもよい。   A human sensor may be provided in the vicinity of the projection surface, and the human sensor receives a human image between the human sensor and the range of the projected image from the projector on the projection surface. You may have a lens which can condense on an optical part.

本発明の自動焦点調整方法は、
プロジェクタの投写レンズの焦点距離を自動的に調整する自動焦点調整方法であって、プロジェクタと画像の投射される投写面との距離を連続して自動的に計測するステップと、計測されたプロジェクタと投写面との距離に基づいて、そのプロジェクタの投写レンズの焦点距離を連続して調整するステップと、プロジェクタと投写面との間における人間の存在を連続して自動的に感知するステップと、人間を感知している間、プロジェクタの投写レンズの焦点距離の調整を中断するステップと、を含むことを特徴とする。 The automatic focus adjustment method of the present invention includes:
An automatic focus adjustment method for automatically adjusting a focal length of a projection lens of a projector, the step of automatically measuring the distance between the projector and a projection surface onto which an image is projected, and a measured projector Continuously adjusting the focal length of the projection lens of the projector based on the distance to the projection plane, continuously detecting human presence between the projector and the projection plane, and human And the step of interrupting the adjustment of the focal length of the projection lens of the projector while sensing.

本発明では、測距センサが内蔵され焦点距離を自動的に調整しているプロジェクタにおいて、プロジェクタと投写面との間を人間が遮ろうとした場合でも、人間の動き検出が可能な人感センサを用いて人間を検出することにより、その人間との距離に対応したオートフォーカス動作を一時的に停止させるので、投写面の画像の焦点が乱れることがない。   According to the present invention, in a projector that has a built-in distance measurement sensor and automatically adjusts the focal length, a human sensor capable of detecting human movement even when a human tries to block between the projector and the projection surface. By detecting a person and using it, the autofocus operation corresponding to the distance to the person is temporarily stopped, so that the focus of the image on the projection plane is not disturbed.

オートフォーカス調整機能を有するプロジェクタでは、投写面との距離をプロジェクタに内蔵された測距センサにより常時計測しており、プロジェクタ、あるいは投写面が移動した場合、瞬時に自動で焦点の再調整が行われるが、人間がプロジェクタと投写面との間を遮ろうとした場合には、人間との距離を投写面との距離と認識して焦点を調整するという問題点がある。本発明では、プロジェクタに内蔵された人感センサにより人間を検知して焦点調整を一時的に停止するので、人間がプロジェクタと投写面との間を遮ろうとした場合でも、常に焦点の合った画像を投写面に投写することができるという効果がある。   In projectors that have an autofocus adjustment function, the distance to the projection surface is constantly measured by a distance measuring sensor built in the projector, and when the projector or the projection surface moves, the focus is automatically readjusted instantly. However, when a person tries to block between the projector and the projection plane, there is a problem in that the focus is adjusted by recognizing the distance from the person as the distance from the projection plane. In the present invention, since the human detection is detected by the human sensor incorporated in the projector and the focus adjustment is temporarily stopped, even when the human tries to block the projector and the projection surface, the focused image is always in focus. Can be projected onto the projection surface.

本発明のオートフォーカス調整機能を有するプロジェクタでは、プロジェクタや投写面を含めた設置状態が変化した場合においても、常にフォーカスが合った状態を提供するとともに、人間がプロジェクタと投写面との間に入り込んだ場合にも、投写面には焦点の合った画像が投写されることを特徴とする。   In the projector having the autofocus adjustment function of the present invention, even when the installation state including the projector and the projection surface changes, the projector always provides a focused state and a human enters between the projector and the projection surface. Even in this case, a focused image is projected on the projection surface.

本発明の実施の形態について図面を参照して説明する。図１は本発明の第１の実施の形態のオートフォーカス調整機能を有するプロジェクタの模式的ブロック構成図である。図１に示されるように本発明の第１の実施の形態のプロジェクタ１は、画像投写要素としての光源部２１、画像形成素子２３を有する光学エンジン２２、投写レンズ２４、フォーカス調整部２５、映像信号入力部２６、および画像制御部２７と、オートフォーカス要素としての測距センサ３１、測距部３２、およびフォーカス調整制御部３３と、人間感知要素としての集光レンズ４１、人感センサ４２、および人感制御部４３と、全体の動作を制御する中央制御装置５０とを有する。   Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic block diagram of a projector having an autofocus adjustment function according to the first embodiment of the present invention. As shown in FIG. 1, the projector 1 according to the first embodiment of the present invention includes a light source unit 21 as an image projection element, an optical engine 22 having an image forming element 23, a projection lens 24, a focus adjustment unit 25, and an image. A signal input unit 26 and an image control unit 27; a distance measuring sensor 31 as an autofocus element; a distance measuring unit 32; and a focus adjustment control unit 33; a condenser lens 41 as a human sensing element; In addition, the control unit 43 includes a human control unit 43 and a central controller 50 that controls the overall operation.

プロジェクタ１の画像投写要素では、映像信号入力部２６に入力した映像信号を画像制御部２７で制御して光学エンジン２２の画像形成素子２３にて画像を形成し、画像形成素子２３で形成された画像を、光源部２１からの光によって投写レンズ２４を経由して外部の投写面６０に投写する。投写レンズ２４の焦点はフォーカス調整部２５により調整される。   In the image projection element of the projector 1, the video signal input to the video signal input unit 26 is controlled by the image control unit 27, and an image is formed by the image forming element 23 of the optical engine 22. The image is projected onto the external projection surface 60 via the projection lens 24 by the light from the light source unit 21. The focus of the projection lens 24 is adjusted by the focus adjustment unit 25.

オートフォーカス要素では、距離測定装置である測距センサ３１を有する測距部３２が投写面６０までの距離を計測する。距離測定装置自体はカメラ用を始めとして既に多くの方式が衆知となっており、対象までの距離を正確に測定できる装置であれば使用できる。フォーカス調整制御部３３は、測距部３２により計測された距離情報に基づき、フォーカスレンズ駆動に関し、正転、逆転、停止といった必要動作を判別してフォーカス調整部２５に出力し、フォーカス調整部２５はレンズモータを駆動し、投写レンズ２４のレンズ群の一部を前後に移動させることにより、焦点を自動で調整する。この時、常時監視の状態で測距センサ３１による距離情報を常に更新することにより、焦点の再調整が継続して行われ、プロジェクタ１、あるいは投写面６０が移動した場合においても、投写面６０上の画像を常時焦点の合った状態に維持する。また、フォーカス調整制御部３３は、後述のように人感制御部４３からの人間感知の情報により、焦点調整をその直前の状態で固定する。   In the autofocus element, a distance measuring unit 32 having a distance measuring sensor 31 as a distance measuring device measures a distance to the projection plane 60. The distance measuring device itself is already widely known, including for cameras, and any device that can accurately measure the distance to an object can be used. The focus adjustment control unit 33 discriminates necessary operations such as normal rotation, reverse rotation, and stop regarding the focus lens drive based on the distance information measured by the distance measurement unit 32, and outputs it to the focus adjustment unit 25. Adjusts the focus automatically by driving a lens motor and moving a part of the lens group of the projection lens 24 back and forth. At this time, by constantly updating the distance information by the distance measuring sensor 31 in the constantly monitoring state, the readjustment of the focus is continuously performed, and even when the projector 1 or the projection plane 60 moves, the projection plane 60 Keep the top image in focus at all times. In addition, the focus adjustment control unit 33 fixes the focus adjustment in a state immediately before it based on the human detection information from the human detection control unit 43 as described later.

人間感知要素では、人感センサ４２は集光レンズ４１を介してプロジェクタ１と投写面６０上の投写画像との間に存在する人間を検知する。人感センサ４２は防犯用をはじめライトの自動点灯用としても広く用いられており集電素子に代表されるセンサが使用できる。集光レンズ４１は投写レンズ２４から投写された投写面６０上の画像表示領域とほぼ一致する領域にある人間の像を人感センサ４２に集光する役割を果たす。人感制御部４３は人感センサ４２の検知範囲内に人間を検知している間、測距部３２の計測した投写面６０までの距離に基づくフォーカス調整の一時的な固定をフォーカス調整制御部３３に指示する。フォーカス調整制御部３３は常時は測距部３２の計測した投写面６０までの距離に基づいてフォーカス調整部２５により投写レンズ２４の焦点距離を調整しているが、人感制御部４３からの指示があると投写レンズ２４の焦点距離を直前の状態で固定し、人感制御部４３からの指示がなくなると測距部３２の計測した距離に基づく投写レンズ２４の焦点距離の調整を再開する。   In the human sensing element, the human sensor 42 detects a human existing between the projector 1 and the projected image on the projection surface 60 via the condenser lens 41. The human sensor 42 is widely used not only for crime prevention but also for automatic lighting of a light, and a sensor represented by a current collecting element can be used. The condensing lens 41 plays a role of condensing the human image in the human sensor 42 in an area substantially coincident with the image display area on the projection surface 60 projected from the projection lens 24. The human motion control unit 43 temporarily fixes focus adjustment based on the distance to the projection plane 60 measured by the distance measurement unit 32 while detecting a human within the detection range of the human motion sensor 42. 33 is instructed. The focus adjustment control unit 33 normally adjusts the focal length of the projection lens 24 by the focus adjustment unit 25 based on the distance to the projection plane 60 measured by the distance measurement unit 32. If there is, the focal length of the projection lens 24 is fixed in the previous state, and when there is no instruction from the motion control unit 43, the adjustment of the focal length of the projection lens 24 based on the distance measured by the ranging unit 32 is resumed.

次に、本発明の実施の形態のオートフォーカス調整機能を有するプロジェクタの焦点距離調整の動作について説明する。上述のように、プロジェクタ１と投写面６０との間に何も障害物がない場合、測距センサ３１により計測された距離情報に基づき、フォーカス調整制御部３３にてフォーカスレンズ駆動に関し、正転、逆転、停止といった必要動作を決定し、フォーカス調整部２５によりレンズモータを駆動し、投写レンズ２４のレンズ群の一部を前後に移動することにより、焦点距離を自動的に調整する。この時、測距センサ３１による距離情報を常に更新することにより、焦点距離の再調整を続け、プロジェクタ１、あるいは投写面６０が移動した場合においても、常時投写画像の焦点が合った状態を維持する。ここで、プロジェクタ１と投写面６０との間を人間が遮ろうとした場合、集電素子に代表される人感センサ４２によって人間の動きを検知し、人感制御部４３からフォーカス調整制御部３３に対し、フォーカス調整部２５経由の一連のレンズ駆動を一時的に停止させる命令を最優先で実行するように発行する。なお、ここで集光レンズ４１は投写レンズ２４にて投写された投写面６０上の表示領域とほぼ一致する領域に入る人間の映像を人感センサ４２に集光する役割を果たす。   Next, the operation of adjusting the focal length of the projector having the autofocus adjustment function according to the embodiment of the present invention will be described. As described above, when there is no obstacle between the projector 1 and the projection surface 60, the focus adjustment control unit 33 performs forward rotation on the focus lens drive based on the distance information measured by the distance measuring sensor 31. Necessary operations such as reverse rotation and stop are determined, the lens motor is driven by the focus adjustment unit 25, and the focal length is automatically adjusted by moving a part of the lens group of the projection lens 24 back and forth. At this time, the distance information obtained by the distance measuring sensor 31 is constantly updated, so that the readjustment of the focal length is continued, and even when the projector 1 or the projection surface 60 moves, the state in which the projected image is always in focus is maintained. To do. Here, when a human attempts to block between the projector 1 and the projection surface 60, the human motion is detected by the human sensor 42 typified by a current collecting element, and the human motion control unit 43 to the focus adjustment control unit 33. On the other hand, a command for temporarily stopping a series of lens driving via the focus adjustment unit 25 is issued so as to be executed with the highest priority. Here, the condensing lens 41 plays a role of condensing, on the human sensor 42, a human image that enters an area substantially coincident with the display area on the projection surface 60 projected by the projection lens 24.

これらの一連の動作を図２のフローチャートに示す。図２は本発明の実施の形態のオートフォーカス調整機能を有するプロジェクタの焦点距離調整の動作を示すフローチャートである。プロジェクタ１を起動すると（Ｓ１）、一度、測距センサ３１の取得した距離データに基づいて、オートフォーカス処理を実行することにより投写面６０に投写された画像が焦点の合った状態となる（Ｓ２）。その後、人感センサ４２により常時、人間の検知を実行し続ける（Ｓ３）。人間を検知している場合は、次の処理へは移行せず、オートフォーカス再調整は行わない（Ｓ３Ｙｅｓ）。人間を検知しなくなると、次の処理へ移行し（Ｓ３Ｎｏ）、測距センサ３１により距離変化を判別する（Ｓ４）。距離に変化がなければ、再びステップＳ３に戻って処理を続け（Ｓ４Ｎｏ）、距離に変化があれば次のステップに進み（Ｓ４Ｙｅｓ）、処理終了であれば（Ｓ５Ｙｅｓ）、オートフォーカス処理を終了し（Ｓ６）、処理終了でなければ（Ｓ５Ｎｏ）、ステップＳ２に戻ってフォーカス処理を継続する。   A series of these operations is shown in the flowchart of FIG. FIG. 2 is a flowchart showing the focal length adjustment operation of the projector having the autofocus adjustment function according to the embodiment of the present invention. When the projector 1 is activated (S1), the image projected on the projection plane 60 is brought into focus by executing the autofocus process once based on the distance data acquired by the distance measuring sensor 31 (S2). ). Thereafter, human detection is continuously performed by the human sensor 42 (S3). If a human is detected, the process does not proceed to the next process, and the autofocus readjustment is not performed (S3 Yes). If no human is detected, the process proceeds to the next process (No in S3), and the distance change is determined by the distance measuring sensor 31 (S4). If there is no change in the distance, the process returns to step S3 again to continue the process (No in S4). If there is a change in the distance, the process proceeds to the next step (S4 Yes). (S6) If the process is not finished (S5 No), the process returns to step S2 to continue the focus process.

オートフォーカス処理Ｓ２により、フォーカスの再調整を行い、その後同様に人間検知のステップＳ３に移行する。したがって、人間を検知しない限り（Ｓ３Ｎｏ）、ステップＳ４で距離変化に対し、瞬時にオートフォーカス処理が実行され続け、人間を検知すると（Ｓ３Ｙｅｓ）、オートフォーカス処理は停止され、常に投写面６０にフォーカスが合った直前の状態を維持する。   The focus is readjusted by the autofocus process S2, and then the process proceeds to the human detection step S3 in the same manner. Therefore, unless a human is detected (S3 No), the autofocus process is continuously executed for the distance change in step S4. When a human is detected (S3 Yes), the autofocus process is stopped and the focus is always on the projection plane 60. Maintain the state just before the match.

第１の実施の形態では、人感センサ４２がプロジェクタ１の内部に設けられたこととして説明したが、第２の実施の形態として、プロジェクタ１と投写面６０との間の人間の存在が検知できる場所であれば、例えば人感センサ４２が投写面６０の近傍に設けられていてもよい。   In the first embodiment, it has been described that the human sensor 42 is provided inside the projector 1. However, as the second embodiment, the presence of a human between the projector 1 and the projection surface 60 is detected. For example, the human sensor 42 may be provided in the vicinity of the projection surface 60 as long as it is possible.

本発明の第１の実施の形態のオートフォーカス調整機能を有するプロジェクタの模式的ブロック構成図である。1 is a schematic block configuration diagram of a projector having an autofocus adjustment function according to a first embodiment of the present invention. 本発明の実施の形態のオートフォーカス調整機能を有するプロジェクタの焦点距離調整の動作を示すフローチャートである。It is a flowchart which shows the operation | movement of the focal distance adjustment of the projector which has an auto-focus adjustment function of embodiment of this invention.

符号の説明Explanation of symbols

１ プロジェクタ
２１ 光源部
２２ 光学エンジン
２３ 画像形成素子
２４ 投写レンズ
２５ フォーカス調整部
２６ 映像信号入力部
２７ 画像制御部
３１ 測距センサ
３２ 測距部
３３ フォーカス調整制御部
４１ 集光レンズ
４２ 人感センサ
４３ 人感制御部
５０ 中央制御装置
Ｓ１〜Ｓ６ ステップ DESCRIPTION OF SYMBOLS 1 Projector 21 Light source part 22 Optical engine 23 Image formation element 24 Projection lens 25 Focus adjustment part 26 Image signal input part 27 Image control part 31 Distance sensor 32 Distance measurement part 33 Focus adjustment control part 41 Condensing lens 42 Human sensor 43 Human controller 50 Central controller S1-S6 Step

Claims (4)

投写面に映像を投写するプロジェクタにおいて、
前記プロジェクタから前記投写面までの距離を連続的に計測する測距部と、
焦点距離が調整可能な投写レンズと、
前記測距部の計測結果に基づいて自動的に前記投写レンズの焦点距離を調整するフォーカス調整部と、
前記投写面と前記プロジェクタとの間の人間の所在を感知可能な人感センサと、
前記人感センサが人間の所在を感知したときに前記フォーカス調整部による前記投写レンズの焦点距離の調整を中断させる人感制御部と、を備えたことを特徴とするオートフォーカス調整機能を有するプロジェクタ。 In a projector that projects an image on a projection surface,
A distance measuring unit that continuously measures the distance from the projector to the projection surface;
A projection lens with adjustable focal length;
A focus adjustment unit that automatically adjusts the focal length of the projection lens based on the measurement result of the distance measurement unit;
A human sensor capable of sensing a human location between the projection surface and the projector;
A projector having an autofocus adjustment function, comprising: a human motion control unit that interrupts adjustment of a focal length of the projection lens by the focus adjustment unit when the human sensor detects a human location . 前記人感センサが前記投写面近傍に設けられている、請求項１に記載のオートフォーカス調整機能を有するプロジェクタ。   The projector having an autofocus adjustment function according to claim 1, wherein the human sensor is provided in the vicinity of the projection surface. 前記人感センサには、該人感センサと前記投写面の前記プロジェクタからの投写画像の範囲との間の人間の像を該人感センサの入光部に集光できるレンズを有する、請求項１または請求項２に記載のオートフォーカス調整機能を有するプロジェクタ。   The human sensor includes a lens capable of condensing a human image between the human sensor and a range of a projected image of the projection plane from the projector on a light incident portion of the human sensor. A projector having an autofocus adjustment function according to claim 1. プロジェクタの投写レンズの焦点距離を自動的に調整する自動焦点調整方法であって、
前記プロジェクタと画像の投射される投写面との距離を連続して自動的に計測するステップと、
計測された前記プロジェクタと前記投写面との距離に基づいて、該プロジェクタの投写レンズの焦点距離を連続して調整するステップと、
前記プロジェクタと前記投写面との間における人間の存在を連続して自動的に感知するステップと、
前記人間を感知している間、前記プロジェクタの投写レンズの焦点距離の調整を中断するステップと、を含むことを特徴とするプロジェクタの自動焦点調整方法。



An automatic focus adjustment method for automatically adjusting the focal length of a projection lens of a projector,
Continuously and automatically measuring the distance between the projector and the projection surface on which the image is projected;
Continuously adjusting the focal length of the projection lens of the projector based on the measured distance between the projector and the projection plane;
Continuously and automatically sensing the presence of a human between the projector and the projection surface;
And a step of interrupting the adjustment of the focal length of the projection lens of the projector while the human is being sensed.



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