JP2002111590A - Receiver by optical signal transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the need for using flexible wires and flexible substrates, etc., for the wiring of a photodetector for receiving optical signals, and to extend communication distance in an optical signal transmitter. SOLUTION: This receiver 3, for constituting the optical signal transmitter 1, is provided with the photodetector 4 fixed inside the receiver for receiving optical signals from a transmitter 2, a lens member 6 fixed inside the receiver to converge light from the transmitter 2 and make the photodetector 4 receive the light and a movable mirror 5 for reflecting the light from the transmitter 2 on a reflection surface 5a, and then leading it via the lens member 6 to the photodetector 4. Then, a drive mechanism 7 is provided to change the position or posture of the reflection surface 5a of the movable mirror 5. The movable mirror 5 is driven within a plane orthogonal to the optical axis of the photodetector 4 or within a plane which includes the optical axis and the optical axis is adjusted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical signal transmission using infrared rays or the like, which controls the position and attitude of a movable mirror provided on the receiving device side to transmit light from the transmitting device to the inside of the receiving device. The present invention relates to a technique for causing a photodetector to receive light.

[0002]

2. Description of the Related Art A transmission / reception device using infrared rays or the like is widely used for various controls as a remote control device (remote commander) in video equipment, audio equipment and the like.

[0003] For example, information (a video signal, an audio signal, etc.) output from a computer or a video device, a command signal, or the like is wirelessly transmitted to a projector using an infrared transmission device to perform image projection and control for the image. Device.

[0004] By the way, in securing a communication path between a transmitting device and a receiving device constituting an optical communication device, a photo-detector provided in the receiving device is driven by a driving mechanism (for changing its position and orientation). There is known a configuration in which the drive mechanism has one or two drive shafts, thereby performing position control or attitude control of the photodetector. Have been.

[0005]

However, the conventional apparatus has the following problems with respect to the wiring and communication distance between the photodetector and the substrate.

[0006] Regarding the electrical connection between the photodetector and the substrate (substrate on which the amplifier and the like are mounted) due to the fact that the photodetector for receiving the optical signal from the transmitting device is attached to its drive mechanism. Must be performed using a flexible wire or a flexible substrate. Therefore, it is easily affected by disturbance such as noise.

The communication distance between the transmitting device and the receiving device is related to the light receiving area (or light receiving angle range) of the photodetector, and there is a certain limit in increasing the communication distance. In infrared communication, the distance is several meters (about 3 to 5 m).

Accordingly, the present invention provides an optical signal transmission device that does not require the use of a flexible wire or a flexible substrate for wiring of a photodetector that receives an optical signal, and reduces the communication distance. The task is to make it longer.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a photodetector fixed to a receiving device for receiving an optical signal from a transmitting device, and a light detector for receiving light from the transmitting device. A lens member fixed to the receiving device for condensing and receiving the light by the photodetector, and a movable member for guiding the light from the transmitting device to the photodetector via the lens member after reflecting the light from the reflecting surface. A mirror and a driving mechanism for changing the position or posture of the reflecting surface of the movable mirror are provided, and the movable mirror is driven in a plane orthogonal to or including the optical axis of the photodetector. The position or posture is controlled by a mechanism.

Therefore, according to the present invention, the photodetector for receiving the optical signal from the transmitting device is fixed to the receiving device, and its position and attitude do not change. There is no need to wire with a flexible wire, etc.
Further, since the light from the transmitting device is condensed through the lens member fixed to the receiving device and then received by the photodetector, the communication distance can be lengthened.

[0011]

FIG. 1 shows the basic configuration of the present invention. An optical signal transmission device 1 is composed of a transmission device (or transmission unit) 2 and a reception device (or reception unit) 3. You.

The receiving device 3 is provided with light detecting means for receiving an optical signal from the transmitting device 2. However, in the present invention, the position and attitude of the light detecting means are not changed by the driving mechanism. The “optical signal” here includes a signal transmitted by electromagnetic waves such as infrared rays, visible light, and ultraviolet rays.

As shown in the figure, a photodetector 4 constituting a photodetecting means is fixed in a receiving device 3, and a movable mirror 5 is used as an optical system for causing the photodetector 4 to receive light. The lens member 6 (condensing lens) is arranged on the optical path.

The movable mirror 5 reflects the light from the transmitting device 2 on its reflecting surface 5a (flat surface or curved surface).
A drive mechanism 7, which is required to guide the light to the photodetector 4 via the lens member 6 and changes the position or attitude of the reflection surface 5a, is provided. That is, the position or orientation of the movable mirror 5 is controlled by the drive mechanism in a plane orthogonal to the optical axis of the photodetector 4 or in a plane including the optical axis.

The lens member 6 is disposed between the movable mirror 5 and the photodetector 4 for condensing the light from the transmitting device 2 and causing the photodetector 4 to receive the light. It is fixed to. Note that the lens member 6 is a member necessary to enlarge the substantial light receiving area of the photodetector 4, so that a longer transmission distance can be secured as compared with the related art.

According to the present invention, when the optical signal from the transmitting device 2 is transmitted to the receiving device 3, the light reflected by the reflecting surface 5a of the movable mirror 5 is collected by the lens member 6. After the light is emitted, the light is received by the photodetector 4. In this case, the drive control of the movable mirror 5 is required. For this purpose, it is preferable to arrange a plurality of fixed sensors 8, 8,... In order to detect the transmission direction or position of the transmission device by receiving the optical signal from the transmission device 2.

That is, 2 including a photodetector and a fixed sensor
By using different types of light detection means, it is possible to distinguish between detection of the transmission direction and position and reception of an optical signal.

The fixed sensors 8 are arranged as a sensor group using a plurality of photodetectors (photodiodes or the like). For example, as shown in the figure, the plurality of fixed sensors 8, 8,... Are respectively mounted on individual mounting substrates 10, 10,. In order to receive the light from the transmitting device 2 over a wide range, they are arranged at a predetermined angular interval on a circumference having substantially the same radius from the center of the substrate 9.

These fixed sensors are required for performing rough detection of the transmission direction or position (the transmission direction and the distance to the transmission device) of the transmission device 2. Note that the simplest method is to detect the transmission direction with a fixed sensor group, and the transmission direction can be easily determined from the magnitude of each detection level by the fixed sensor group. Because the output is large.).

In FIG. 1, there is provided a movable mirror mechanism comprising a movable mirror 5 and a driving unit 7a thereof, and this mechanism constitutes an optical axis adjusting mechanism. As shown, since the movable mirror 5 can be rotated around the rotation axis 5b, the direction of the optical axis can be adjusted by rotating the movable mirror 5. In addition, it goes without saying that a drive mechanism having two or more axes may be used, such as adding a tilting mechanism for tilting the mirror.

FIGS. 2 to 4 show an example 3A of a receiving device (receiving unit) constituting the infrared communication device.

As schematically shown in FIG. 2, the receiving device 3A
Is composed of a square box-shaped base portion 11 and an optical axis adjustment block 12 provided on the base portion.

On the front of the base 11, there is provided an indicator 14 formed by arranging a number of light emitting diodes (LEDs) 13, 13,. The light-transmitting window 1 is located almost at the center of the three sides except the back.
5, 15, and 15 are formed, respectively, and the photodetector 1 is formed through a transparent member (formed of a material that allows infrared rays to pass therethrough) fitted into these light-transmitting windows.
6, 16, 16 (corresponding to the fixed sensor 8;
It is called “fixed PD”. ) Face the outside (only two of them are shown in the figure).

A photodetector (hereinafter referred to as “main P”) corresponding to the photodetector 4 is provided inside the base 11.
D ". ) 17 are attached, and each fixed PD 16 is arranged around the main PD 17.

The optical axis adjusting block 12 adjusts the optical axis so that light from a transmitting unit (transmitting device) not shown is reflected by a movable mirror (infrared reflecting mirror) 18 and then received by a main lens 17 through a fixed lens 19. A mechanism is adopted. The reflecting surface 1 of the movable mirror 18
8a is formed by forming a material (wavelength selection film or the like) that reflects infrared light and transmits visible light on a glass substrate, whereby disturbance light can be sufficiently attenuated. The fixed lens 19 is provided at the boundary between the base 11 and the optical axis adjustment block 12 and condenses the reflected light to guide it to the chip (light receiving unit) of the main PD 17.

As shown, the external shape of the optical axis adjustment block 12 is substantially cylindrical, and a cylindrical portion 20 formed of a transparent member (made of a material having a property of transmitting infrared rays). Having. And the cylindrical portion 2
A cover 21 that covers the upper edge opening of the cylinder 20 is provided, and the inside of the cylindrical portion 20 is separated into two spaces by a disk-shaped partition 22 that partitions the cover 21 and the cylindrical portion 20.
The movable mirror 18 is arranged in a cylindrical portion located between the partition wall 22 and the base 11, and its attitude is controlled by a driving mechanism 23.

This drive mechanism is configured to have the following two drive shafts.

(I) A drive axis for rotating the movable mirror in a plane perpendicular to the optical axis of the photodetector. (II) A plane including the optical axis in relation to the optical axis of the photodetector. , A drive shaft for tilting the movable mirror.

In the illustrated example, a drive mechanism (rotating mechanism) 24 including the drive shaft (I) is disposed in a space formed between the partition 22 and the covering portion 21, and The rotating shaft 1 of the movable mirror 18 is driven by the fixed driving mechanism 24.
8b is controlled. That is, the drive mechanism includes a motor 24a as a drive source and a transmission gear 24b, and the movable mirror 18 is rotated around its rotation axis 18b by the transmission gear 24b rotated by the motor 24a. ing.

A drive mechanism (tilt mechanism) 25 including a drive shaft (II) is attached to the movable mirror 18 in the cylindrical portion 20, and controls the tilt axis of the movable mirror 18. That is, the drive mechanism 25 includes a motor 25a as a drive source and a drive gear 25b, and the drive gear 25b rotated by the motor 25a is integrated with the movable mirror 18 and provided on a tilt shaft (provided on a support portion 33 described later). ).

Accordingly, the driving mechanism 24 is, for example, a rotating mechanism for rotating the movable mirror 18 on a horizontal plane.
When the driving mechanism 25 is a tilting mechanism that tilts the movable mirror 18 in a vertical plane, the attitude of the movable mirror 18 in the horizontal direction or the vertical direction can be controlled independently, and the configuration for that purpose is also compared. Is simple.

FIG. 3 shows an example of the arrangement of the photodetectors, in which the base 11 is cut and viewed from a direction along the optical axis of the main PD 17.

A main PD (main sensor) 17 is mounted at the center of a substrate 26 disposed in the base 11, and mounting substrates 27, 27 having fixed PDs are provided above, below, and to the left of the main PD. 27 are arranged. That is, three fixed PDs are arranged at an angular interval of about 90 degrees with respect to the optical axis of the main PD 17.
The 16 mounting substrates 27 are fixed upright on the substrate 26.

Light (infrared light) from the transmission device is passed through each fixed PD through each light transmitting window 15 (a transparent member 28 is fitted in each window) provided in the base 11. ) Is received. That is, in this example, three fixed PDs
For example, if an optical signal is transmitted from the direction indicated by the arrow B in the figure, one fixed PD (upper part in FIG. ), The detection level is hardly obtained, while the remaining two fixed PDs obtain a certain detection level. In other words, because of the directivity of these two fixed PDs, the one closer to (the light source of) the transmitting device outputs a larger detection level, so that the transmission direction is roughly detected by detecting the level difference between the two. be able to.

As described above, since the main PD 17 can be directly fixed to the substrate 26, connection with a circuit such as an amplifier mounted on the substrate is simplified. It is not necessary at all.)
Be less affected by noise. In addition, since the mounting substrate 27 of each fixed PD 16 can be connected to the substrate 26, the connection processing between the photodetector and the substrate becomes very simple, and these can be collectively stored in the base portion 11. .

FIG. 4 shows the internal structure of the receiving device 3A.

A circular hole 29 is formed in a portion of the housing of the base 11 where the cylindrical portion 20 is provided, and a fixed lens 19 is attached to the hole 29. In this example, a flat lens (such as a Fresnel lens) is used as the fixed lens 19.
However, it is a matter of course that a plano-convex lens or the like may be used.

As for the housing of the receiving device 3A, the first housing 30 (base 11) and the second housing 31 (cover 21 and partition 22 constituting the optical axis adjustment block 12) are provided. A lens member (fixed lens 19) and a photodetector (main PD 17) are mounted in the first housing 30;
Further, the drive mechanism 24 is mounted inside the second housing 31. The movable mirror 1 is placed in a space formed between the first housing 30 and the second housing 31.
8 are arranged. Accordingly, the light detecting means is accommodated in the first housing part 30 so as not to be affected by external light, and a sufficient accommodation space for the driving mechanism and the movable mirror can be secured. In this example, a motor 24a constituting the drive mechanism 24, a worm 24c attached to a shaft of the motor, and a transmission gear 24b (worm wheel) meshed with the worm are provided in the second housing 31. The rotating shaft 18 b of the movable mirror 18, which is housed and rotated by the mechanism, is supported by a bearing 32 provided on the partition 22. Drive mechanism 2
With respect to 5, the worm 25c is attached to the support portion 33 of the movable mirror 18 in a tiltable state, and the worm 25c attached to the shaft of the motor 25a rotates the drive gear 25b (worm wheel) meshed with the worm 25c. The movable mirror 18 is tilted.

In the receiving device 3A, the driving mechanism 23
, And the fixed PD groups 16, 16,..., And the main PD 17, two-stage adjustment is performed as described below to realize an automatic optical axis adjustment mechanism.

(I) Coarse adjustment = The transmission direction of the transmission device is roughly detected by performing coarse detection on the transmission direction of the transmission device using a plurality of fixed PDs (fixed sensors), and then the movable mirror is moved substantially in the direction. Changing the attitude of a movable mirror by a drive mechanism to aim it.

(Ii) Fine adjustment = Main PD (photodetector)
In order to receive the optical signal from the transmitting device and search for an accurate transmission direction, the driving mechanism slightly changes the attitude of the movable mirror and adjusts the attitude of the movable mirror toward the searched transmission direction. To determine the optimal optical axis adjustment state.

First, (i) estimates the approximate transmission direction based on the respective detection signals of the fixed PD group, and adjusts the optical axis with coarse accuracy. For example, the following method can be mentioned.

(A) A method of rectifying a received signal from each fixed PD and detecting and comparing a DC level. (B) A signal for detecting a transmission direction and a position is preliminarily included in a frame format at the time of data transfer by an optical signal. A method of receiving the detection signal by each fixed PD, extracting the signal, and specifying the transmission direction and the like.

First, the method (A) rectifies a signal emitted from a transmitting device and received by a fixed PD, extracts its DC level, and compares the magnitude relationship of the DC level for each fixed PD. Since the DC level is equivalent to the average level of the received data, a sensor closer to the transmitting device can specify the transmission direction and the distance by using the fact that the detected DC level is larger. .

However, in this method, since the data to be transmitted has a predetermined frequency band centered on the frequency of the carrier wave, the DC level fluctuates depending on the data content even if the signal is transmitted and received in a fixed direction. The problem remains in that

Therefore, in order to avoid this, as in the above method (B), a signal for detecting the transmission direction and position is embedded separately from the data (signal indicating) in the frame format at the time of data transfer. A method is preferable. On the receiving device side, the transmission direction may be specified by receiving or detecting the detection signal with a plurality of fixed PDs and then separating or extracting and comparing the signals.

At this time, there are a method of embedding the detection signal in the frame format by time division and a method of embedding the detection signal in the frame format by frequency division (or frequency multiplexing).

In the next fine adjustment stage (ii), the main PD
The optical axis adjustment is performed more accurately on the basis of the detection information by 17, and the detection method therefor includes the following method.

(A) A method of rectifying a received signal of the main PD or the above-mentioned detection signal to detect a DC level and detecting a peak thereof. (B) An error detection rate or an error correction rate of data received by the main PD. A method of detecting and detecting the minimum value (lowest value).

First, as for the method (a), a method similar to the above methods (A) and (B) is applied to the main PD. In this case, the optical axis direction is slightly changed. In this method, the received signal or the detection signal at that time is rectified to detect the DC level, and to find out where the peak position is. In other words, while changing the attitude of the movable mirror little by little over a minute range, a position where the DC level shows the maximum value may be found, and the optical axis direction at that time may be set to end the fine adjustment.

However, in the case of using the method of rectifying the received signal and detecting the DC component, the same problem as in the method (A) occurs, so that the error detection rate of the received data is reduced as in the method (b). (Or error rate) or an error correction rate, and a method of searching for a transmission direction in which these are minimized is preferable. That is, the error detection rate (or error rate) of the received data is the lowest when the optical axis is properly adjusted with respect to the transmission direction, and the error correction rate is the lowest when performing error correction. (Or that the frequency of error correction is the least or the probability of being uncorrectable is the lowest) can be used to specify the transmission direction. Therefore, in this case, while changing the attitude of the movable mirror little by little over a predetermined minute range, the minimum position (bottom position) at which the error detection rate or the error correction rate is minimized is searched for, and the optical axis at that time is searched for. The fine adjustment may be completed by setting the direction.

In the above configuration example, the movable mirror 18
Is a two-axis drive mechanism, but as long as the present invention is concerned, a configuration having only one of the two drive shafts may be used. For example, the movable mirror 18
A configuration in which only a rotation mechanism for rotating the movable mirror in a horizontal plane by driving the rotating shaft 18b of the movable mirror 18 with a motor, or a configuration in which only a tilt mechanism for tilting the movable mirror 18 in a vertical plane is provided. Can be

However, in the case of the structure shown in FIGS. 2 to 4, the time required for the optical axis adjustment varies depending on the procedure in which the two drive shafts are moved. Is preferred.

That is, the driving mechanism 24 is connected to the movable mirror 1
In the case where the driving mechanism 8 is a driving mechanism in the horizontal plane and the driving mechanism 25 is a driving mechanism in the vertical plane of the movable mirror 18, the optical axis adjustment may be performed in the following procedure.

(1) The transmission direction is roughly detected by the fixed PD group, and the movable mirror 18 is
Is rotated to perform coarse adjustment in the horizontal direction. (2) Drive mechanism 2 based on the detection result of main PD 17
4. Fine adjustment of the movable mirror 18 is performed by (4) the driving mechanism 2 based on the detection result of the main PD 17.
5, the tilt of the movable mirror 18 is adjusted.

For example, in the case of using the above method (a), in the procedure (2), the main PD 1 in the horizontal direction is moved while slightly moving the movable mirror 18 in the horizontal plane.
The position where the detection level of 7 is maximized is searched for and the optical axis is finely adjusted. In step (3), while moving the movable mirror 18 little by little in the vertical plane, a position where the detection level of the main PD 17 is maximized is searched for and the optical axis is adjusted.

As described above, the transmission direction is roughly detected based on the detection results obtained by the plurality of fixed PDs, and the attitude of the movable mirror in the horizontal plane is roughly adjusted.
Finely adjust the attitude of the movable mirror based on the detection result obtained by D, and then obtain the detection result of the main PD (photodetector) at each time while tilting the movable mirror in the vertical plane, and output the main PD. It is preferable to search for the peak position where the level becomes maximum, determine the position, and complete the optical axis adjustment, in order to shorten the required time.

The configuration example described above is merely an example of the embodiment, and various embodiments described below are possible, for example.

As shown in the receiving device 3B of FIG.
PD inside the housing 31 (the covering 21 and the partition 22)
A configuration in which the groups are arranged to reduce the influence of external light, reflected light, and the like (fixed PD 16, light-transmitting window 15,
Components other than the mounting board 27 and the transparent member 28 are the same as those in FIG. ).

As shown in the receiving device 3C of FIG.
The drive mechanism 24 is disposed in the housing 30 (base 11), and the main PD 17 is disposed in the second housing 31 to lower the center of gravity (that is, in FIG. Although the role of the body is reversed, the main PD1
Components other than 7, fixed lens 19, drive mechanism 24, etc., maintain the same positional relationship as in FIG. ).

In addition to this, for example, a rotating parabolic mirror is used as a movable mirror, and the light receiving section of the main PD is arranged at the focal position, and the light condensed by the rotating parabolic mirror is focused on the main PD. Various embodiments such as a configuration in which light is received are possible.

According to the above configuration, the following advantages can be obtained.

Since the photodetector is fixed to the housing,
There is no need to connect the photodetector to the substrate using a flexible substrate or wire having flexibility, and therefore, excellent noise resistance is achieved.

By disposing a lens member (fixed lens) in front of the photodetector, the effective light receiving area (reception range) is expanded, and the communication distance is increased. That is,
Usually, since the photodetector has directivity, the contribution of light from the side surface distant from the optical axis is small. Therefore, as shown by a dashed line in FIGS. 4 to 6, by irradiating the light condensed by the lens member to the light receiving portion of the photodetector, light can be received from a wider range. Is several times larger than before.

Since the transmission direction, that is, the direction of the light source, can be easily detected by attaching the fixed PD group, the optimum communication path can be set in a short time with respect to the current position of the transmission device. .

The loss of the amount of reflected light can be suppressed by forming the reflecting surface of the movable mirror with a material that reflects infrared rays.

For the housing of the receiving device, a configuration having two housings is adopted, and a photodetector is arranged in one of the housings, and the photodetector is mounted on the photodetector by the other housing. By providing a function of blocking light so that disturbance light is not received, an optical signal from the transmission device can be accurately received. That is, in the configuration example of FIG. 4, if the covering portion 21 and the partition wall 22 forming the second housing portion 31 are formed of an opaque material, the influence of external light reaching the main PD 17 from above can be sufficiently reduced. it can.

[0068]

As is apparent from the above description, according to the first aspect of the present invention, the photodetector for receiving the optical signal from the transmitting device is fixed to the receiving device, Since the posture does not change, it is not necessary to wire the photodetector and the connection substrate with a flexible wire or the like, and therefore, the photodetector is hardly affected by disturbance such as noise. Further, since the light from the transmitting device is received by the photodetector after being condensed through the lens member fixed to the receiving device, the communication distance can be lengthened.

According to the second aspect of the present invention, by arranging a plurality of fixed sensors for detecting the transmitting direction or the position of the transmitting device by receiving the optical signal from the transmitting device, the transmitting direction can be improved. Rough detection can be easily performed.

According to the third aspect of the present invention, it is possible to cause the photodetector to efficiently receive infrared rays from the transmitting device.

According to the fourth aspect of the present invention, the driving mechanism of the movable mirror is constituted by the rotating mechanism in the horizontal plane and the tilting mechanism in the vertical plane, so that the driving control and the structure are simplified. , Each mechanism can be controlled independently.

According to the fifth aspect of the present invention, the movable mirror is arranged in the space formed between the first housing and the second housing constituting the housing of the receiving device. In addition, a space for disposing the movable mirror can be secured, and a compact device can be realized.

According to the invention of claim 6, the substrate can be shared for a plurality of fixed sensors and photodetectors.

According to the seventh aspect of the present invention, the photodetector is provided in the first housing and the plurality of fixed sensors are provided in the second housing, so that these sensors can detect external light or the like. Accurate light detection can be assured without simultaneous effects.

According to the eighth aspect of the present invention, in the attitude control of the movable mirror, the coarse adjustment using the detection result of the fixed sensor is performed, and then the fine adjustment based on the detection result of the photodetector is performed. And the optical axis adjustment of the movable mirror can be performed quickly.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a basic configuration of the present invention.

FIG. 2 is a diagram showing a configuration example of the apparatus together with FIG. 3 and FIG. 4, and FIG. 2 is a schematic perspective view.

FIG. 3 is a diagram illustrating an example of the arrangement of optical sensors.

FIG. 4 is a longitudinal sectional view.

FIG. 5 is a longitudinal sectional view showing another example of the present invention.

FIG. 6 is a longitudinal sectional view showing still another example of the present invention.

[Explanation of symbols]

2 ... Transmission device, 3, 3A, 3B, 3C ... Reception device, 4 ...
Photodetector, 5: movable mirror, 5a: reflection surface, 5b: rotation axis, 6: lens member, 7: drive mechanism, 8: fixed sensor, 18: movable mirror, 23: drive mechanism, 24: rotation mechanism, 25 ... Tilt mechanism, 24a, 25a ... Motor, 30 ...
1st housing | casing part, 31 ... 2nd housing | casing part

Claims (8)

[Claims] An optical signal transmission receiving device, comprising: a light detector fixed to a receiving device for receiving an optical signal from the transmitting device, comprising: a light detector for receiving an optical signal from the transmitting device. A lens member fixed to the receiving device for collecting light from the transmitting device and receiving the light by the photodetector, after reflecting the light from the transmitting device on a reflecting surface, A movable mirror for guiding to a photodetector, and a drive mechanism for changing a position or a posture of a reflection surface of the movable mirror, wherein the movable mirror is a plane orthogonal to an optical axis of the photodetector. A receiving device for transmitting an optical signal, wherein the position or the attitude is controlled by the driving mechanism in a plane or a plane including the optical axis. 2. The receiving apparatus according to claim 1, wherein a plurality of fixed sensors for detecting a transmitting direction or a position of the transmitting apparatus by receiving an optical signal from the transmitting apparatus are arranged. A receiving device using optical signal transmission, characterized in that: 3. The optical signal transmission receiver according to claim 1, wherein the reflecting surface of the movable mirror is formed of a material that reflects infrared rays and transmits visible light. Receiver. 4. The receiving apparatus according to claim 1, wherein the driving mechanism for driving the movable mirror rotates the movable mirror in a horizontal plane by driving a rotation axis of the movable mirror by a motor. A receiving apparatus for transmitting an optical signal, comprising: a rotating mechanism; and a tilting mechanism for tilting a movable mirror in a vertical plane. 5. The receiving device according to claim 4, wherein a housing of the receiving device has a first housing and a second housing, and wherein the first housing has a first housing and a second housing. A lens member and a photodetector are attached to the body, a driving mechanism is attached to the second housing, and a space is formed between the first housing and the second housing. A receiving device using optical signal transmission, wherein a movable mirror is disposed. 6. The receiving apparatus according to claim 5, wherein a plurality of fixed sensors are provided on the first housing.
A receiving device for transmitting an optical signal, wherein these fixed sensors are arranged around a photodetector. 7. The receiving apparatus according to claim 5, wherein a plurality of fixed sensors are provided in the second housing. 8. The receiving device according to claim 2, wherein the transmission direction is almost specified by performing coarse detection on the transmission direction of the transmission device using a plurality of fixed sensors, and the driving mechanism is provided. The coarse adjustment of the attitude of the movable mirror is performed.From this state, the optical detector receives the optical signal from the transmitting device, searches for the correct transmission direction, and finely adjusts the attitude of the movable mirror by the driving mechanism. Characteristic receiver by optical signal transmission.