Deflection angle measuring device, optical signal switching system, information recording and replaying system, deflection angle measuring method, and optical signal switching method
First Claim
1. A deflection angle measuring device for measuring a deflection angle of an optical deflecting element for deflecting a light comprising:
- a light source for emitting a light toward a reflecting surface of measurement for which is provided in the optical deflecting element;
a beam splitter for changing at least a part of a light path of a reflected light which is reflected at the reflecting surface;
a concave reflecting surface which is disposed on a light path which is changed by the beam splitter;
a light measuring device for measuring the deflection angle of the light which is reflected at the concave reflecting surface and deflected by the optical deflecting element according to a light receiving position so as to face the concave reflecting surface.
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Accused Products
Abstract
A light of measurement emitted from a semiconductor laser (1) is incident to a beam splitter formed by a prism (4). The light of measurement transmits into an incident surface (3) having a positive power so as to be emitted to a reflecting surface (5c) of measurement. A light reflected there is returned by a beam splitting surface (4a) so as to be reflected by a concave reflecting surface (6). The reflected light is returned so as to be condensed and focused on a light receiving surface (8) of sensor in a light measuring device (7). A position of a spot of light which is received is measured so as to measure the deflection angle of a rotating mirror (5). By doing this, it is possible to form a compact device even if the length of the optical path is long. As a result, it is possible to broaden the deflection angle measuring range.
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Citations
45 Claims
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1. A deflection angle measuring device for measuring a deflection angle of an optical deflecting element for deflecting a light comprising:
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a light source for emitting a light toward a reflecting surface of measurement for which is provided in the optical deflecting element;
a beam splitter for changing at least a part of a light path of a reflected light which is reflected at the reflecting surface;
a concave reflecting surface which is disposed on a light path which is changed by the beam splitter;
a light measuring device for measuring the deflection angle of the light which is reflected at the concave reflecting surface and deflected by the optical deflecting element according to a light receiving position so as to face the concave reflecting surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 34)
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24. An optical signal switch system comprising:
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an input cable unit which is provided with at least an input cable inside of which an optical signal is transmitted;
an output cable unit which is provided with at least an output cable which receives the optical signal which is transmitted inside the input cable and transmits thereinside;
an optical switching device which is disposed between the input cable unit and the output cable unit so as to selectively transmit the optical signal which is transmitted from at least one of the input cables to at least one cable in the output cable unit, wherein the optical switching device comprises;
a light deflecting element which is disposed to be inclined at a predetermined deflecting angle so as to selectively change a light path of the optical signal which is transmitted in the input cable; and
a deflection angle measuring device for measuring the deflecting angle of the light deflecting element, and the deflection angle measuring device comprises;
a light source which emits a light toward a reflecting surface of measurement which is disposed on the light deflecting element;
a concave reflecting surface for reflecting a light which is reflected at the reflecting surface of measurement; and
a light measuring device for measuring a deflection angle of at the light deflecting element according to a light receiving position where the light which is reflected at the concave reflecting surface is received. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32, 33, 35, 36, 37, 38, 39, 40)
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41. An information recording and replaying system comprising:
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a recording medium having a recording surface which can record and/or replay an information signal by emitting a light thereto;
a light source which emits a light flux for recording and/or replaying the information signal to the recording medium;
an optical system for focusing the light flux on a recording surface on the recording medium;
a light deflecting element which is disposed in the optical system for deflecting the light flux in a surface parallel with the recording surface and has a reflecting surface of which inclination angle changes synchronously according to the deflection angle; and
a deflection angle measuring device for measuring the deflection angle of the light deflecting element, wherein the deflection angle measuring device is provided with;
a light source for emitting a light to a reflecting surface of measurement which is disposed on the light deflecting element;
a concave reflecting surface for reflecting a light which is reflected at the reflecting surface of measurement;
a light measuring device for receiving a light which is reflected at the concave reflecting surface and measures the deflection angle at the light deflecting element. - View Dependent Claims (42)
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43. Deflection angle measuring method for measuring a deflection angle at a light deflecting element by emitting a light to a reflecting surface of measurement which is disposed on a light deflecting element for deflecting a light by inclining a reflecting surface comprising steps of:
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emitting a measurement light on a reflecting surface on the light deflecting element by transmitting a part of a measurement light through a beam splitter;
reentering a light which is reflected at the reflecting surface so as to be incident to a surface of the beam splitter and switching a light path of at least a part of the light;
reflecting the light of which light path is switched at the concave reflecting surface;
receiving a light which is reflected at the concave reflecting surface by the light measuring device; and
measuring a position for where the reflected light is received by the light measuring device so as to measure the deflection angle.
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44. Optical signal switching method for selectively entering an optical signal which is emitted from at least one of a plurality of input cables to be incident to at least one of a plurality of output cables and transmitting the optical signal in the output cables comprising steps of:
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specifying a position of the input cable, among a plurality of input cables, from which the optical signal is emitted and a position of the output cable which is selected;
specifying a deflection angle of a light deflecting element for reflecting a light which is emitted from the input cable of which position is specified to the selected output cable;
emitting a light for measuring the deflection angle to a reflecting surface of measurement which is disposed on the light deflecting element and reflecting the light thereat;
returning a light path of the reflected light via a concave reflecting surface and receiving the reflected light by the light measuring device;
measuring the deflection angle of the light deflecting element according to a position where the light is received;
adjusting the deflection angle of the light deflecting element so as to be a predetermined angle; and
entering the optical signal to be incident to the selected output cable such that the optical signal is selectively transmitted. - View Dependent Claims (45)
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Specification