JP2010145584A5

JP2010145584A5 -

Info

Publication number: JP2010145584A5
Application number: JP2008320642A
Authority: JP
Filing date: 2008-12-17
Publication date: 2011-12-22
Anticipated expiration: 2028-12-17

Description

この改善策として、高圧水銀ランプを用いた監視用映像表示装置に於いて、２つの高圧水銀ランプを動作していた一方の高圧水銀ランプの寿命時に交互に切り替えることで、全体的に高圧水銀ランプの寿命を延している（例えば、特許文献１参照。）。 As a measure to improve this, in a video display device for monitoring using a high-pressure mercury lamp, the two high-pressure mercury lamps were operated alternately. (See, for example, Patent Document 1).

しかしながら、２４時間の連続運転を必要とし且つ１０年以上の稼働時間を必要とする監視分野に於いては、先行技術によっても、依然として、人手による光源の交換作業は不可欠であり、そのため、当該交換作業により監視が一時的に中断してしまうと言う問題点は解決されるに至っていなかった。 However, in the monitoring field that requires continuous operation for 24 hours and requires an operation time of 10 years or more, it is still indispensable to manually replace the light source according to the prior art. the problem that the monitoring by the operator will temporarily suspend was not lightning come to be solved.

本発明の主題に係る映像表示装置の光源切り替え装置は、赤色の光を発光するＲ光源と、緑色の光を発光するＧ光源と、青色の光を発光するＢ光源とから成る第１光源と、前記第１光源の前記Ｒ光源、前記Ｇ光源及び前記Ｂ光源の各々の出力側にそれぞれ配設される第１乃至第３のコリメータレンズより成る第１レンズ群と、前記第１光源の前記Ｒ光源、前記Ｇ光源及び前記Ｂ光源とそれぞれ同様の光学特性を有するＲ光源、Ｇ光源及びＢ光源から成る第２光源と、前記第２光源の前記Ｒ光源、前記Ｇ光源及び前記Ｂ光源の各々の出力側にそれぞれ配設される第４乃至第６のコリメータレンズより成る第２レンズ群と、互いに対向する前記第１コリメータレンズと前記第４コリメータレンズとの間に配設されており、赤色の光を反射する一方、その他の色の光を透過する光学特性を有する第１ダイクロイックミラーと、前記第１ダイクロイックミラーを回転させ得る第１モータと、互いに対向する前記第２コリメータレンズと前記第５コリメータレンズとの間に配設されており、緑色の光を反射する一方、その他の色の光を透過する光学特性を有する第２ダイクロイックミラーと、前記第２ダイクロイックミラーを回転させ得る第２モータと、互いに対向する前記第３コリメータレンズと前記第６コリメータレンズとの間に配設されており、青色の光を反射する一方、その他の色の光を透過する光学特性を有する第３ダイクロイックミラーと、前記第３ダイクロイックミラーを回転させ得る第３モータと、前記第１ダイクロイックミラーで反射された赤色の第１光線束と、前記第２ダイクロイックミラーで反射された緑色の第２光線束と、前記第３ダイクロイックミラーで反射された青色の第３光線束とが合成されて成る白色光線束を集光すると共に、前記第１光線束の光軸、前記第２光線束の光軸及び前記第３光線束の光軸の何れとも合わさった光軸を有する集光レンズと、前記集光レンズより出力される前記白色光線束より、前記第１光線束の輝度、前記第２光線束の輝度及び前記第３光線束の輝度を、それぞれ電流値として検出する光センサーと、前記光センサーの各光線束に関する出力値と閾値とを順次に比較して、前記光センサーの出力値が前記閾値の所定率以下となる場合には当該出力値に対応する光線束を発光する光源がその寿命に達していると判断して、寿命に達していると判断された光源をＯＦＦ状態に設定すると共に、寿命に達していると判断された光源に対応するダイクロイックミラーを回転駆動するモータに、該当するダイクロイックミラーの回転を指令する寿命検出部とを備えており、前記第１光源の前記Ｒ光源、前記Ｇ光源及び前記Ｂ光源が時分割で駆動されて発光している場合に、前記寿命検出部が、前記第１光源の前記Ｒ光源、前記Ｇ光源及び前記Ｂ光源の内で寿命に達している光源があると判断した際には、寿命に達していると判断された光源をＯＦＦ状態に設定し且つ前記第２光源の前記Ｒ光源、前記Ｇ光源及び前記Ｂ光源の内で当該寿命に達していると判断された光源が発光する光と同色の光を発光する光源をＯＮ状態に設定すると共に、前記第１乃至第３モータの内で当該寿命に達していると判断された光源に対応するダイクロイックミラーを回転駆動するモータに回転指令を発し、前記回転指令を受けたモータは、前記第１乃至第３ダイクロイックミラーの内で当該寿命に達していると判断された光源に対応するダイクロイックミラーを、当該ダイクロイックミラーで反射された光線束の光軸が前記集光レンズの前記光軸と再び合わさる様に回転させることを特徴とする。

A light source switching device for a video display device according to the present invention includes a first light source including an R light source that emits red light, a G light source that emits green light, and a B light source that emits blue light. A first lens group including first to third collimator lenses disposed on the output side of each of the R light source, the G light source, and the B light source of the first light source, and the first light source. A second light source composed of an R light source, a G light source, and a B light source each having optical characteristics similar to those of the R light source, the G light source, and the B light source; the R light source of the second light source; the G light source; A second lens group composed of fourth to sixth collimator lenses disposed on each output side, and disposed between the first collimator lens and the fourth collimator lens facing each other; While reflecting red light Between the first dichroic mirror having an optical characteristic of transmitting the other color light, and a first motor capable of rotating the first dichroic mirror, and the second collimator lens facing each other and the fifth collimator lens are arranged to, while reflecting the green light, and a second dichroic mirror having an optical characteristic of transmitting the other color light, and a second motor capable of rotating the second dichroic mirror, facing each other A third dichroic mirror that is disposed between the third collimator lens and the sixth collimator lens and has an optical characteristic of reflecting blue light while transmitting light of other colors; 3 dichroic a third motor for the dichroic mirror can be rotated, and the first light bundle of the red reflected by the first dichroic mirror, said second A white light beam formed by combining the green second light beam reflected by the ichroic mirror and the blue third light beam reflected by the third dichroic mirror is collected, and the first light beam is collected. A condensing lens having an optical axis combined with any of the optical axis of the second light bundle and the optical axis of the third light bundle, and the white light bundle output from the condensing lens, A light sensor that detects the brightness of the first light flux, the brightness of the second light flux, and the brightness of the third light flux as current values, and an output value and a threshold value for each light flux of the light sensor sequentially. In comparison, when the output value of the optical sensor is equal to or less than the predetermined ratio of the threshold value, it is determined that the light source that emits the light bundle corresponding to the output value has reached the end of its life. Turn off the light source determined to be A motor for rotating the dichroic mirror corresponding to the light source that has been determined to have reached the end of life, and a life detecting unit that commands rotation of the corresponding dichroic mirror, and When the R light source, the G light source, and the B light source are driven in a time-sharing manner to emit light, the life detection unit has a life within the R light source, the G light source, and the B light source of the first light source. When it is determined that there is a light source that has reached the lifetime, the light source that has been determined to have reached the end of its life is set to the OFF state, and among the R light source, the G light source, and the B light source of the second light source A light source that emits light of the same color as the light emitted from the light source that has been determined to have reached the lifetime is set to the ON state, and it is determined that the lifetime has been reached in the first to third motors. Corresponding to the light source A dichroic mirror that issues a rotation command to a motor that rotationally drives the ichroic mirror, and the motor that has received the rotation command corresponds to a light source that is determined to have reached the end of its lifetime among the first to third dichroic mirrors. Is rotated so that the optical axis of the light beam reflected by the dichroic mirror is again aligned with the optical axis of the condenser lens.

Claims

A first light source comprising an R light source that emits red light, a G light source that emits green light, and a B light source that emits blue light;
A first lens group including first to third collimator lenses disposed on the output side of each of the R light source, the G light source, and the B light source of the first light source;
A second light source composed of an R light source, a G light source, and a B light source each having the same optical characteristics as the R light source, the G light source, and the B light source of the first light source;
A second lens group comprising fourth to sixth collimator lenses respectively disposed on the output side of each of the R light source, the G light source, and the B light source of the second light source;
A first dichroic mirror that is disposed between the first collimator lens and the fourth collimator lens facing each other and has optical characteristics of reflecting red light and transmitting light of other colors;
A first motor capable of rotating the first dichroic mirror,
A second dichroic mirror disposed between the second collimator lens and the fifth collimator lens facing each other, and having an optical characteristic of reflecting green light while transmitting light of other colors;
A second motor capable of rotating the second dichroic mirror,
A third dichroic mirror disposed between the third collimator lens and the sixth collimator lens facing each other and having optical characteristics of reflecting blue light while transmitting other colors of light;
A third motor capable of rotating the third dichroic mirror,
A first red light beam reflected by the first dichroic mirror, a second green light beam reflected by the second dichroic mirror, and a third blue light beam reflected by the third dichroic mirror; And a light collecting unit that collects a white light bundle formed by combining the optical axis of the first light bundle, the optical axis of the second light bundle, and the optical axis of the third light bundle. A light lens,
An optical sensor for detecting the brightness of the first light flux, the brightness of the second light flux and the brightness of the third light flux as current values from the white light flux output from the condenser lens;
A light source that emits a light bundle corresponding to the output value when the output value of each light bundle of the photosensor is sequentially compared with a threshold value and the output value of the photosensor is equal to or less than a predetermined ratio of the threshold value. The motor that drives the dichroic mirror corresponding to the light source that is determined to have reached the lifetime is set to the OFF state for the light source that has been determined to have reached the lifetime. And a life detection unit that commands rotation of the corresponding dichroic mirror,
When the R light source, the G light source, and the B light source of the first light source are driven in a time-sharing manner to emit light, the life detection unit is configured to use the R light source, the G light source, and the light source of the first light source. When it is determined that there is a light source that has reached the end of its lifetime among the B light sources, the light source that has been determined to have reached the end of life is set to an OFF state and the R light source, the G light source, A light source that emits light of the same color as the light emitted from the light source determined to have reached the lifetime among the B light sources is set to the ON state, and the lifetime is reached within the first to third motors. A rotation command is issued to the motor that rotates the dichroic mirror corresponding to the light source determined to have reached,
The motor that has received the rotation command causes the dichroic mirror corresponding to the light source that has been determined to have reached the end of its lifetime among the first to third dichroic mirrors to the optical axis of the light beam reflected by the dichroic mirror. Is rotated so that it is again aligned with the optical axis of the condenser lens,
Light source switching device for video display device.