【特許請求の範囲】
【請求項１】
発光部からの検出光を受光部で受けて信号を出力するフォトセンサにおいて、
前記発光部と前記受光部との間に、径方向に貫通して、前記検出光を通過させるための開口部を形成した軸部材を配置し、
前記軸部材を回転させて前記開口部を通して前記受光部にて受光される光量を変化させることにより信号出力レベルを変化させることを特徴とするフォトセンサ。
【請求項２】
請求項１に記載のフォトセンサを用いるとともに、
前記軸部材を検出対象物の動きに連動させて回転させ、該軸部材の回転に伴って変化する信号出力レベルに基づいて前記検出対象物の移動位置又は移動方向を検出することを特徴とする移動検出装置。
【請求項３】
請求項２に記載の移動検出装置を備えたことを特徴とする機器。
【請求項４】
請求項２に記載の移動検出装置を備えたことを特徴とするカメラ。
【請求項５】
前記検出対象物が、開閉動作して撮影光路面積を変化させる遮光部材であることを特徴とする請求項４に記載のカメラ。
[Claims]
[Claim 1]
In a photosensor that receives the detection light from the light emitting part at the light receiving part and outputs a signal
A shaft member that penetrates in the radial direction and forms an opening for passing the detected light is arranged between the light emitting portion and the light receiving portion.
Photosensor, characterized in that to change the signal output level by changing the amount of light received by the light receiving portion through the opening by rotating the shaft member.
2.
While using the photo sensor according to claim 1,
The shaft member is rotated in conjunction with the movement of the detection target, and the moving position or moving direction of the detection target is detected based on the signal output level that changes with the rotation of the shaft member. Movement detector.
3.
An apparatus including the movement detection device according to claim 2.
4.
A camera comprising the movement detection device according to claim 2.
5.
The camera according to claim 4, wherein the detection object is a light-shielding member that opens and closes to change the shooting optical path area.
【００１１】
【課題を解決するための手段】
上記の課題を解決するために、本発明では、発光部からの検出光を受光部で受けて信号を出力するフォトセンサ（フォトインタラプタ等）において、発光部と受光部との間に、径方向に貫通して、前記検出光を通過させるための開口部を形成した軸部材を配置し、この軸部材を回転させて開口部を通して受光部にて受光される光量を変化させることにより信号出力レベルを変化させるようにしている。
0011
[Means for solving problems]
In order to solve the above problems, in the present invention, in a photo sensor (photo interrupter or the like) that receives the detected light from the light emitting unit at the light receiving unit and outputs a signal, the radial direction is between the light emitting unit and the light receiving unit. A shaft member having an opening for passing the detected light is arranged, and the shaft member is rotated to change the amount of light received by the light receiving portion through the opening to change the signal output level. I am trying to change.
すなわち、発光部と受光部との間の光路上に、上記開口部を有する軸部材を配置し、検出対象物に連動させて軸部材を上記光路上で回転させることで検出対象物の移動位置又は移動方向を検出できるようにしている。
That is, a shaft member having the opening is arranged on the optical path between the light emitting portion and the light receiving portion, and the shaft member is rotated on the optical path in conjunction with the detection target object to move the detection target object. Alternatively, the moving direction can be detected.
【００３４】
【発明の効果】
以上説明したように、本発明によれば、発光部と受光部との間の光路上に、径方向に貫通して、検出光を通過させるための開口部を有する軸部材を配置し、検出対象物に連動させて軸部材を上記光路上で回転させることで、受光部への受光量を変化させてフォトセンサ出力レベルを変化させ、検出対象物の移動位置や移動方向を検出できるようにしているので、フォトセンサ、さらにはこれを用いた移動検出装置や機器のコンパクト化を図ることができる。しかも、発光部および受光部に対する軸部材の配置位置のずれがフォトセンサ出力に与える影響が小さいため、従来のセンサほど高い部品寸法精度や組立精度が要求されることをなくすることができる。
0034
【Effect of the invention】
As described above, according to the present invention, a shaft member having an opening for passing the detected light through the optical path between the light emitting portion and the light receiving portion is arranged and detected. By rotating the shaft member on the optical path in conjunction with the object, the amount of light received by the light receiving portion is changed to change the photosensor output level, so that the moving position and moving direction of the detected object can be detected. Therefore, it is possible to make the photo sensor, and further, the movement detection device and the device using the photo sensor compact. Moreover, since the deviation of the arrangement position of the shaft member with respect to the light emitting portion and the light receiving portion has a small influence on the photo sensor output, it is possible to eliminate the requirement for higher component dimensional accuracy and assembly accuracy than the conventional sensor.