JP2565829Y2 - Optical axis adjustment device for spatial light transmission system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an optical axis adjusting device of a spatial light transmission system, and more particularly to an optical axis adjusting device of a spatial light transmission system using an invisible light source. .

(Prior Art) A visible light or an invisible light is used as a carrier, and various data are loaded on the carrier to transmit the light in a characteristic direction from an optical transmitter, and an optical receiver disposed on the optical axis of the light is used. A spatial light transmission system for detecting the light after receiving the light by a device, extracting necessary data, and using the data for various data processing is well known.

For example, when an extraordinary event is held in a large gymnasium, many lighting devices that can change the light projection direction and lighting color are placed on the ceiling and side walls, and these lighting devices use a spatial light transmission device. And remote control from the control room.

FIG. 6 is a block diagram showing a schematic configuration of a spatial light transmission system used for a general device such as the above-mentioned lighting device. In FIG. 6, reference numeral 1 denotes a control-side transmitting / receiving device installed in the control room side, and a light-emitting element 2 that emits visible light or invisible light, and a lens that narrows the light emitted by the light-emitting element 2 into a parallel light flux. A head unit 6 including a light transmitting unit T1 having a system 3 and a light receiving unit R1 having a lens system 5 for condensing a light beam transmitted from the other side to a light receiving element 4, an input device 7 and a display device 8; And a process of modulating an input signal, transmitting a signal to be transmitted from the light transmitting unit T1 to the light transmitting unit T1, processing a signal received by the light receiving unit R1, and displaying the signal on the display device 8, and the like. The control device 9 performs the following.
Reference numeral 10 denotes a controlled-side transmitting / receiving device provided in a projector mounted on a ceiling or the like of a large room such as a gymnasium, and a light emitting element 12 that emits visible light or invisible light and a light emitting element 12 that emits light emitted by the light emitting element 12 in parallel. Transmitter with lens system 13 for focusing on luminous flux
A head unit including T2 and a light receiving unit R2 having a lens system 15 for condensing a light beam transmitted from the other side to the light receiving element 14.
16, a light projector 17, and a driving device 18 for changing the light projection direction and the illumination color of the light projector 17, demodulating the light beam sent from the control transmitting / receiving device 1, and driving the demodulated signal. The light is applied to the device 18 and the light emitting device 17 is driven by the driving device 18, and the position signal of the light emitting device 17 whose driving is controlled and the signal of the color currently being projected are transmitted to the light transmitting unit T2, and these signals are controlled. And a control device 19 that performs a control operation of causing the transmission / reception device 1 to transmit. In addition, the control-side transmitting / receiving device 1
The detailed configuration of the head unit 6 and the head unit 16 of the controlled-side transmission / reception device 10 will be described. However, since both have substantially the same structure, only the head unit 6 will be described. Description is omitted. FIG. 7 is a block diagram showing the configuration of the head unit 6. As shown in FIG. In FIG. 7, reference numeral 6a denotes a signal input terminal, from which a signal for operating the projector 17 in various ways is input. 6b is an interface circuit. 6c is a local oscillator, 6d is a driver for driving the light receiving element 2, 6e is an output terminal for extracting a signal transmitted from the controlled transmitting / receiving device 10, 6f is an interface circuit,
6g is a detector, 6h is an amplifier, and 6i is a level detection terminal 6i for detecting the output level of the signal transmitted from the controlled transceiver 10. As described above, the control-side transmission / reception device 1 or the controlled-side transmission / reception device 10 has a structure such as the level detection terminal 6i that can check the amount of received light so that the optical axis alignment can be easily performed. Have. When aligning the optical axes of the control-side transmission / reception device 1 and the controlled-side transmission / reception device 10, these two devices are first placed facing each other and temporarily installed, and the light-transmitting unit T1 of the control-side transmission / reception device 1 transmits the controlled-side transmission / reception device. Sends light to 10 light receiving units R2. On the controlled transmission / reception device 10 side, a level meter or the like is connected to the level detection terminal of the head unit 16.
A measuring device that can detect the amount of light received by the light receiving unit R2 is connected, and the position of the head unit 16 is adjusted so that the value is maximized. Next, light is transmitted from the light transmitting unit T2 of the controlled transmitting / receiving device 10 to the light receiving unit R1 of the controlled transmitting / receiving device 1. On the control side transmitting / receiving device 1, a measuring device such as a level meter that can detect the amount of light received by the light receiving portion R1 is connected to the level detection terminal 6i of the head portion 6, and the position of the head portion 6 is adjusted and the value is adjusted. Try to maximize. Such fine adjustment of the positions of the two head portions is repeated many times so that the optical axes of the control-side transmitting / receiving device 1 and the controlled-side transmitting / receiving device 10 are matched.

(Problems to be Solved by the Invention) By the way, in the method of adjusting the optical axis as described above, the interval between the control-side transmitting / receiving device 1 and the controlled-side transmitting / receiving device 10 is about several meters to several tens of meters. In addition, this is effective when the brightness surrounding the control-side transmitting / receiving device 1 and the controlled-side transmitting / receiving device 10 is appropriately dark. However, in practice, light received from the light emitting element is narrowed down by a lens system to improve the light arrival efficiency, thereby forming a thin light beam. Therefore, when the distance between the two exceeds 20 meters or when the brightness of the surroundings increases, the light emitted from the light transmitting unit cannot be easily visually recognized at the position of the light receiving unit. In some cases, labor is required.

In addition, in order to avoid interference with surrounding light, invisible light may be used as the light emitted from the light transmitting unit. However, since the invisible light is invisible to the adjuster, the control side transmission / reception is required during optical axis alignment work. In some cases, it is not even possible to temporarily install the device and the controlled transmitting / receiving device in opposition to each other.

When the distance between the control-side transmitting / receiving device and the controlled-side transmitting / receiving device is large or when an invisible light source is used, there is a method using another light emitting device that emits a visible light beam for optical axis alignment. A light emitting device must be separately prepared in addition to the transmission system, and if the optical axis of the separately provided light emitting device does not completely coincide with the optical axis of the spatial light transmission system, it is useless.

There is also a method using a sight similar to a sight such as a rifle, but if the distance between the controlling transmitting and receiving device and the controlled transmitting and receiving device is large, it is necessary to attach a telescope, In addition to the disadvantages described above, there is an additional trouble that it is necessary to correct the deviation of the optical axis between the sight and the spatial light transmission system.

(Means for Solving the Problems) The present invention is intended to solve the above-mentioned conventional disadvantages, and an object of the present invention is to provide an optical axis adjusting apparatus for a spatial light transmission system, which is used for adjusting an optical axis between transmitting and receiving apparatuses. Is to obtain an optical axis adjusting device that can easily execute the above by simple means.

In order to achieve the object of the present invention as described above, the present invention provides a control transmitting / receiving apparatus having an optical transmitter and an optical receiver, and a controlled transmitting / receiving apparatus having an optical transmitter and an optical receiver. Are arranged at regular intervals, and the optical transmitter and the optical receiver of these devices adjust the optical axis of a space transmission system of the full duplex communication system in which data transmission is performed by an optical medium traveling along an optical axis coincident with each other. In the device, any one of the control-side transmitting / receiving device and the controlled-side transmitting / receiving device is regarded as one device, and the visible light is disposed on the optical axis of the lens system of the other device and at a position deviated from the focal point of the lens system. A visible light emitting device that emits light and is detachable, and is provided on the other device of the control-side transmitting / receiving device and the controlled-side transmitting / receiving device, and visible light emitted from the visible light emitting device of the one device through a lens system is provided. Detectable optical receiver and upper Adjusting means for adjusting the position of the optical receiver to a position at which the output of the optical receiver provided in the other device of the controlling-side transmitting / receiving device and the controlled-side transmitting / receiving device is maximized. The present invention provides an optical axis adjusting device for a space transmission system.

(Function) A light source for adjusting the optical axis is movably disposed on the optical axis of the optical system at a position other than the focal point, and the emitted light emitted from the light source and divergently emitted is aligned with the optical axis. The receiving side receives the light and adjusts the position so that the light receiving signal is maximized.

(Example) Next, the Example of this invention is described in detail with reference to drawings.

FIG. 1 is an explanatory diagram showing an embodiment in which the present invention is applied to a full-duplex communication type spatial light transmission system. First
In the figure, L1 is an optical axis connecting a light transmitting unit T1 serving as an optical transmitter and a light receiving unit R2 serving as an optical receiver, and L2 is a light receiving unit R1 serving as an optical receiver and a light transmitting unit serving as an optical transmitter. Optical axes connecting the portion T2, which are parallel to each other. In FIG. 1, the same parts as those of the conventional device are denoted by the same reference numerals. FIG. 1 shows the distance between the optical axis L1 and the optical axis L2 exaggerated from the actual distance between the control-side transmitting / receiving device and the controlled-side transmitting / receiving device. Reference numeral 2 denotes a light emitting element on the control transmitting / receiving apparatus 1 side, and reference numeral 12 denotes a light emitting element on the controlled transmitting / receiving apparatus 10 side. In this embodiment, these elements are light emitting elements that emit invisible light. Therefore, the control transmitting / receiving apparatus 1 and the controlled transmitting / receiving apparatus
At the time of optical axis alignment with 10, light emitted from these light emitting elements cannot be visually recognized with the naked eye. Control transmitting / receiving device 1
The light emitting element 2 on the side is disposed at the focal position of the lens system 3, and the light receiving element 4 is disposed at the focal position of the lens system 5. The light receiving element 14 of the controlled transmitting / receiving device 10 is arranged at the focal position of the lens system 15 of the light receiving element 14, and the light emitting element 12 is arranged at the focal position of the lens system 13. Reference numeral 20 denotes a visible light emitting device temporarily provided for optical axis alignment. The visible light emitting device 20 is detachably disposed on the optical axis L2 deviated from the focal position of the lens system 5, and its detailed structure will be described later.

 Next, the procedure of optical axis alignment will be described.

First, the head unit 6 on the control-side transmitting / receiving device 1 is temporarily fixed roughly toward the controlled-side transmitting / receiving device 10. And
The visible light emitting device 20 arranged in front of the light receiving element 4 is turned on,
Emit visible light.

On the other hand, the control-side transmission / reception device 1 is visually determined from the position where the controlled-side transmission / reception device 10 is installed. Control transmitting / receiving device 1
When the direction in which the head unit 6 faces is significantly out of order, the emitted light of the visible light emitting device 20 cannot be visually recognized from the controlled transmitting / receiving device 10 side. In such a case, the direction of the temporary installation position on the control-side transmitting / receiving apparatus 1 is adjusted again so that the light emitted from the visible light emitting device 20 can be visually recognized from the controlled-side transmitting / receiving apparatus 10. The means for adjusting the installation position of the control-side transmitting / receiving apparatus 1 can be realized in various ways by known means, but these means are adjusting means for adjusting the position of the optical receiver. Such means is controlled by the controlled transmitting / receiving apparatus 10
Is also provided.

Visible light emitted from the visible light emitting device 20 is emitted by the lens system 5. Since the visible light emitting device 20 is deviated from the focal position of the lens system 5, the visible light emitting device 20 radiates in a divergent shape. As a result, a part of the light beam 22 enters the lens system 15 of the controlled transmitting / receiving device 10, and the light is condensed on the light receiving element 14. The level meter connected to the level detection terminal of the head unit 16 has a response according to the amount of light incident on the light receiving element 14. The adjuster adjusts the position of the head unit 16 by means for adjusting the position of the controlled transmission / reception device 10 so that the shake of the level meter becomes maximum while watching the level meter, and temporarily fixes the head unit 16.

Although not shown in FIG. 1, in the next step, the light receiving element 14 of the head unit 16 on the controlled transmitting / receiving apparatus 10 side is used.
The visible light emitting device is temporarily detachably disposed at a position deviated from the focal point of the lens system 15 on the optical axis L1 between the optical system L1 and the lens system 15, and the visible light emitting device is temporarily disposed on the optical axis L2 in the head unit 6. The light emitting device 20 is removed.

Next, the visible light emitting device disposed between the light receiving element 14 and the lens system 15 is turned on, and then the visible light emitted from the turned on visible light emitting device is transmitted to the light receiving element 4 of the control-side transmitting / receiving device 1. While looking at the level meter attached to the head unit 6, the position of the head unit 6 is adjusted so as to maximize the deflection, and the head unit 6 is temporarily fixed.

Such an adjustment operation is repeated several times, and the position of the head unit 6 is adjusted so that the deflection of the level meter attached to the head unit 6 is maximized. Further, the deflection of the level meter attached to the head unit 16 is maximized. The position of the head unit 16 is adjusted so that the optical axes of the head units 6 and 16 are aligned.

In FIG. 1, since the interval between the two heads is shorter than the interval between the two optical axes, the amount of light incident on the light receiving unit from the visible light emitting device seems to be small. The distance between the two heads is 2,000 cm or more, and the distance between the two optical axes is about 5 cm, so this distance can be ignored, and when one head looks at the other head, it is visible. The light emitted from the light emitting device appears to be emitted from the light emitting element.

FIG. 2 and FIG. 3 are a perspective view and a sectional view showing an embodiment in which a board provided with the visible light emitting device 20 is detachably provided. In FIG. 2, reference numeral 30 denotes an outer casing constituting a head unit. In the outer casing, a light transmitting unit T1 and a light receiving unit R1 are provided side by side. A slit 32 is provided on the upper surface of the light receiving unit R1, and a test board 34 including the visible light emitting device 20 is inserted through the slit 32. 3, the test board 34 has a knob 36 at the upper end and a flat plug 38 at the lower end. A visible light emitting device 20 that emits visible light is mounted inside the test board 34. When the test board 34 is completely inserted through the slit 32, the plug 38 is inserted into a receptacle 40 provided inside the outer casing 30. Then, at the time of the optical axis alignment operation, the visible light emitting device 20 is turned on, and the optical axis alignment operation is performed in the above-described procedure. In FIG. 3, it is needless to say that the light receiving element 4 is installed at the focal position of the lens system 5, and the test board 34 is arranged at a position shifted from the focal position of the lens system 5.

2 and 3, reference numeral 42 denotes when the slit 32 is unnecessary.
This is a lid that closes the cover, and is slidably provided on the back side of the outer casing 30. Reference numeral 44 denotes a knob attached to the cover 42, and reference numeral 46 denotes a screw for locking the closed cover 42 so as not to be opened unintentionally.

FIG. 4 is a perspective view showing an embodiment in which the visible light emitting device 20 is rotatably arranged on the optical axis. In FIG. 4, 50
Is a substrate that constitutes the light receiving unit R1. On the substrate 50, a light receiving element holding plate 52 on which the light receiving element 4 is mounted and a lens holding pair 54 having the lens system 5 are mounted. On the front surface of the light receiving element holding plate 52, a fixing base 56 having a cross section of "" is mounted by a method such as a spot weld method. A turntable 58 is rotatably attached to the upper end of the fixed stand 56. The end of a rotating plate 60 to which the visible light emitting device 20 is fixed is fixed to the turntable 58. A tension spring for positioning is provided between the periphery of the rotating plate 60 and the fixed base 56.
62 are stretched. The turntable 58 is provided with a rotation shaft 66 having a knob 64 at the tip. Although not shown in the drawing, the knob 64 projects outside the outer casing. Therefore, when the knob 64 is rotated, the rotary plate 60 is rotated accordingly. As described above, since the spring 62 is stretched between the rotary plate 60 and the fixed base 56, the rotary plate 60 is positioned at a position where it is in contact with the front edge of the fixed base 56 or at the lower edge with the stopper 68. Is stably stopped at one of the positions where it abuts. That is, the fifth
As shown in the figure, the position 70 where the tip of the spring 62 is hooked on the rotary plate 60 is located at the light receiving element holding plate 52 of the spring 62.
Center line CL connecting the fixed position 72 to the axis and the center point of the rotating shaft 66
When it is further to the right, the rotary plate 60 is in contact with the front edge of the fixed base 56 and the visible light emitting device 20 is located in front of the light receiving element 4 so that the optical axis alignment work can be performed. The position 70 is the center line
When it is on the left side of CL, the rotating plate 60 comes into contact with the stopper 68, and the light receiving element 4 deviates from the optical axis L1 shown in FIG.

In the above embodiment, a light emitting element that emits invisible light is used for the light emitting unit in the light transmitting unit T1, but in the embodiment using a light emitting element that emits visible light in the light transmitting unit T1, the light emitting element is used. A structure capable of moving itself on the optical axis, for example, a structure in which the light transmitting unit is movable on a rail provided in parallel with the optical axis, and a screw rod is rotatably arranged parallel to the rail. Then, when this is rotated, a nut is screwed with this screw rod and the nut fixed to the light-sending section moves, and as a result, a structure is provided to move the light-sending section along the optical axis. At the time of work, the light-sending section is shifted from the focal position of the lens system, the light beam emitted from the lens system is divergent, and the optical axis is aligned. During normal communication, the light-sending section is returned to the focal position and parallel light beams Take a structure that fires from the lens system be able to.

(Effects of the Invention) As described in detail above, the present invention provides a spatial light transmission system of a full-duplex communication system at a position shifted from a focal position on the optical axis of one optical system of optical communication. A simple structure in which a light source for adjusting the optical axis can be freely arranged is added to the spatial light transmission system, and the optical axis can be easily adjusted simply by using existing equipment in the spatial light transmission system. it can. Therefore, there is no need to prepare a complicated and expensive light emitting device for aligning the optical axis unlike the related art, nor to prepare an expensive sight similar to that used for a gun such as a rifle.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing an embodiment in which the present invention is applied to a full-duplex communication type spatial light transmission system, and FIGS. 2 and 3 show a case where a board provided with a visible light emitting device 20 is inserted and removed. FIG. 4 is a perspective view and a sectional view showing an embodiment provided freely, FIG. 4 is a perspective view showing an embodiment in which the visible light emitting device 20 is rotatably arranged on an optical axis, and FIG. FIG. 6 is a block diagram showing a schematic configuration of a spatial light transmission system used for a general device, and FIG.
FIG. 3 is a block diagram illustrating a configuration of a head unit 6. T1, T2: light transmitting unit, R1, R2: light receiving unit 2, 12, light emitting element 4, 14, light receiving element 3, 5, 13, 15, lens system 20: visible light emitting device 34 … Test board 60 …… Rotating plate 60

Claims (3)

(57) [Scope of request for utility model registration] A control transmitting / receiving apparatus having an optical transmitter and an optical receiver, and a controlled transmitting / receiving apparatus having an optical transmitter and an optical receiver are arranged at regular intervals. An optical axis adjusting device for a full-duplex communication space transmission system in which an optical transmitter and an optical receiver transmit data using an optical medium traveling along an optical axis coincident with each other. A visible light emitting device which is disposed on the optical axis of a lens system of one of the devices and is out of focus of the lens system, emits visible light, and is detachable, An optical receiver provided in the other of the control-side transmitting / receiving device and the controlled-side transmitting / receiving device, and capable of detecting visible light emitted from the visible light emitting device of the one device through a lens system; And controlled transceiver Optical axis adjustment device of the spatial electrical transmission system, characterized in that the output of the optical receiver provided on the other of the apparatus is then provided with adjustment means for adjusting the position of the light receiver in a position of maximum, the. 2. The optical axis adjusting device according to claim 1, wherein the optical axis adjusting light source is provided on a test board that is detachable from the optical axis. 3. A rotating plate having a light source for adjusting the optical axis is rotatably provided near the optical axis, and the rotating plate is rotated at the time of aligning the optical axis so that the light source for adjusting the optical axis is positioned on the optical axis. The optical axis adjusting device for a space transmission system according to claim 1, wherein the optical axis adjusting device is moved and arranged at a position other than the focal point of the optical system.