JP2647443B2 - Optical wireless receiver - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an optical wireless receiver.

[Prior Art] Conventionally, this type of optical wireless receiver X is embedded in a mounting hole 8a formed in a ceiling 8 as shown in FIG. 5 in order to receive light from a wide range. It has been established. By the way, optical wireless receiver X
As shown in FIG. 6, a converging lens 3 is formed so as to cover the opening 2 of the housing 1, and the converging lens 3 has a convex curved outer surface 3a and has a counterbore 3c at the center of the inner surface 3b. The light receiving element 4, which is formed by a lens and has a counterbore portion 3 c facing the opening 2, is disposed at a condensing point of the condenser lens 3. A visible light cut filter 6 is provided between the condenser lens 3 and the opening 2 of the housing 1, and an amplifier for amplifying a light receiving signal output from the light receiving element 4 is provided in the housing 1. The provided signal processing circuit unit 5 is provided. In addition,
FIG. 10 is a light-condensing characteristic diagram in a case where the curved surface of the counterbore portion 3c on the outer surface 3a and the inner surface 3b of the condensing lens 3 is designed with an appropriate exponential function to obtain a desired light-condensing characteristic.

[Problems to be Solved by the Invention] However, in the above-described conventional example, the visible light cut filter 6 irregularly adheres to the inner surface 3b of the condenser lens 3 as shown by hatching in FIG. Color unevenness (the part in close contact with the visible light cut filter 6 becomes black) easily occurs,
There was a problem that the appearance became unsightly. In order to prevent color unevenness, as shown in FIG.
Although it is conceivable to apply a graining process 9 to the inner surface 3b, there is a problem that the multiple reflection light between the visible light cut filter 6 and the condenser lens 3 cannot be effectively used (used as indirect signal light). Furthermore, as shown in FIG. 9, a filler 10 having a refractive index substantially the same as that of the condenser lens 3 is injected between the condenser lens 3 and the visible light cut filter 6 to prevent irregular adhesion. Although it is conceivable that air bubbles may enter the filler 10 to deteriorate the light-collecting characteristics, there is a problem that a filler injection step is separately required in the assembling step and the number of steps is increased.

The present invention has been made in view of the above points, and an object of the present invention is to provide a light source that can eliminate the occurrence of color unevenness without impairing the light-collecting characteristics, and has a simple configuration and is easy to assemble. It is to provide a wireless receiver.

[Means for Solving the Problems] The optical wireless receiver of the present invention covers a converging lens having a counterbore at the center of the inner surface so that the counterbore faces the opening of the housing. In an optical wireless receiver in which a visible light cut filter is interposed between the inner surface and a light receiving element provided in the housing at the light collecting point of the light collecting lens, a counterbore around the inner surface of the light collecting lens is provided. While leaving a protruding wall portion, and forming an annular recess at the periphery of the counterbore portion, pressing the visible light cut filter against the housing with the protruding wall portion, and using the annular recess between the visible light cut filter and the condenser lens. A gap is formed.

[Operation] The present invention is configured as described above, and in the optical wireless receiver in which the condensing lens having the counterbore at the center of the inner surface is covered with the opening of the housing via the visible light cut filter, the condensing lens is provided. A convex wall portion is left on the periphery of the counterbore portion on the inner surface of the inner surface, an annular concave portion is formed, the visible light cut filter is pressed against the housing by the convex wall portion, and the annular concave portion is interposed between the visible light cut filter and the condenser lens. As a result, it is possible to provide an optical wireless receiver that can eliminate the occurrence of color unevenness without impairing the light-collecting characteristics, and that has a simple configuration and is easy to assemble.

[Embodiment] FIG. 1 shows a schematic configuration of a main part of an embodiment of the present invention, in which a converging lens 3 having a counterbore 3c at the center of an inner surface 3b is positioned so that the counterbore 3c faces the opening 2 of the housing 1. , A visible light cut filter 6 is interposed between the housing 1 and the inner surface 3b of the condenser lens 3, and a light receiving element 4 provided in the housing 1 is disposed at a focal point of the condenser lens 3. In an optical wireless receiver similar to the conventional example,
A protruding wall portion 8 is left around the counterbore portion 3c of the inner surface 3b of the condensing lens 3 and an annular concave portion 7 is formed other than the counterbore portion 3c peripheral portion, and the visible light cut filter 6 is pressed against the housing 1 by the protruding wall portion 8. In addition, a gap is formed between the visible light cut filter 6 and the condenser lens 3 by the annular recess 7. Note that a projecting wall is provided around the condensing lens 3.
3d is provided, and the housing 1 is formed by ultrasonic welding.
Attached to. Further, the condenser lens 3 may be attached to the housing 1 using an adhesive.

FIG. 2 shows a circuit example of the signal processing circuit section 5, in which a light receiving module 20, a signal processing circuit 21, and a signal output circuit 22 are shown.
And the power supply circuit 23.

FIG. 3 shows a schematic configuration of a remote monitoring and control system using the optical wireless receiver X according to the present invention, in which a central control unit 31, a plurality of monitoring terminals 32 having unique addresses set, Terminal device 33, wireless relay terminal device 37,
The external interface terminal 38 and the pattern setting terminal 39 are connected by a pair of signal lines 34, and the transmission signal Vs transmitted from the central controller 31 to the signal line 34 is the fourth signal.
As shown in FIG. 1A, a start pulse signal ST indicating the start of signal transmission, a mode data signal MD indicating a signal mode, and an address data signal transmitting 8-bit address data for calling the terminals 32, 33, 37 to 39. AD, the load L ₁ control data signal for transmitting control data for controlling the ~L ₄ CD, double consisting return wait signal WT for setting the return time from the chuck sum data signal CS and the terminal device 32,33,37～39 It is a pole (± 24 V) time-division multiplexed signal, and data is transmitted by pulse width modulation. Each of the terminal units 32, 33, 37 to 39 captures control data of the transmission signal Vs when the address data of the transmission signal Vs received via the signal line 34 matches its own unique address data, and transmits the data. The monitoring data signal is returned as a current mode signal (a signal transmitted by short-circuiting between the signal lines 34 via an appropriate low impedance) in synchronization with the return waiting signal WT of the signal Vs. Further, the central control unit 31 includes a dummy signal transmitting unit that constantly transmits a dummy transmission signal in which the mode data signal MD is set to the dummy mode, one of the monitoring terminal 32 or the wireless relay terminal 37, and the external interface terminal. 38, the fourth returned from the pattern setting terminal 39
When an interrupt signal Vi as shown in FIG. 8B is received, the interrupt generating terminals 32, 37 to 39 are detected and the terminal 3 is detected.
Interrupt processing means for accessing 2, 37 to 39 to return monitoring data is provided. In addition, the central control unit 31
Based on the monitoring data returned from the monitoring terminal 32 or the wireless relay terminal 37, the external interface terminal 38, and the pattern setting terminal 39 to the central controller 31 as described above, the corresponding load L ₁ as well as it generates control data to be transmitted to the control terminal 33 for controlling the ~L _4,
The control data is transmitted to the control terminal 33 via the signal line 34.
Time-division multiplexed transmission so as to control the load L ₁ ~L _4.

Here, the wireless relay terminal 37 is a terminal that relays data of an optical wireless system including the optical wireless transmitter Y, the optical wireless receiver X according to the present invention, and the wireless signal line 40, and is an optical wireless transmitter. The optical signal transmitted from Y is received by the optical wireless receiver X,
The received data is received via the wireless signal line 40, and the data is transferred to the central controller 31. Also, external interface terminal
Reference numeral 38 denotes a terminal that performs data transmission with the external control device 41, and the pattern setting terminal 39 is a terminal that transfers the pattern control data input from the data input unit 42 to the central control device 31. . The monitoring terminal 32 and the control terminal 33 disposed in the distribution board 36 or the relay control panel 36a have a distribution board agreement size, and the control output thereof is used to control the remote control relay for load control. (Latching relay that can be turned on and off by hand switch)
35 is controlled.

Now, in the embodiment, the projecting wall portion 8 is left around the counterbore portion 3c on the inner surface of the condenser lens 3 and the annular concave portion 7 is formed, and the visible light cut filter 6 is formed by the projecting wall portion 8. Since the visible light cut filter 6 is pressed against the housing 1, even when the visible light cut filter 6 is disposed apart from the inner surface 3b of the condenser lens 3, the pressing member of the visible light cut filter 6 is not required and the configuration is simple. And it can be easily assembled. In addition, since a gap is formed between the visible light cut filter 6 and the inner surface 3b of the condenser lens 3 by the annular concave portion 7, it is possible to eliminate the occurrence of color unevenness without impairing the light collection characteristics. I can do it. Note that the width of the protruding wall portion 8 is set to be inconspicuous, but the color of the contact portion on the distal end surface of the protruding wall portion 8 looks different from the other portions. However, since the color non-uniformity is the color non-uniformity of a regular minute portion, the appearance is not impaired. The depth of the annular concave portion 7 for forming the gap may be set to such an extent that the multiple reflection between the visible light cut filter 6 and the inner surface 3b of the condenser lens 3 can be effectively used.

[Effects of the Invention] The present invention is configured as described above, and a light converging lens is provided in an optical wireless receiver in which a converging lens having a counterbore at the center of the inner surface is covered with an opening of a housing via a visible light cut filter. A protruding wall portion is left on the periphery of the counterbore portion on the inner surface of the lens, an annular concave portion is formed, and the visible light cut filter is pressed against the housing at the protruding wall portion, and the annular portion is disposed between the visible light cut filter and the condenser lens. Since the gap is formed by the concave portion, it is possible to eliminate the occurrence of color unevenness without deteriorating the light-collecting characteristics, and to provide an optical wireless receiver that has a simple configuration and is easy to assemble.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a main part of one embodiment of the present invention, FIG. 2 is a main part circuit diagram of the same, FIG. 3 is a schematic configuration diagram of a remote monitoring control system using an optical wireless receiver according to the present invention, FIG. 4 is an explanatory view of the operation of the above, FIG. 5 is a sectional view showing an arrangement example of an optical wireless receiver according to the present invention, FIG. 6 is a sectional view showing a schematic configuration of a main part of a conventional example, and FIG. FIG.
FIG. 9 and FIG. 9 are cross-sectional views of main parts of another conventional example, respectively.
FIG. 10 is an explanatory diagram of the light collecting characteristics of the light collecting lens. 1 is a housing, 2 is an aperture, 3 is a condenser lens, 3a is an outer surface,
3b is an inner surface, 3c is a counterbore portion, 4 is a light receiving element, 5 is a signal processing circuit portion, 6 is a visible light cut filter, 7 is an annular concave portion, 8
Is a projecting wall.

Claims (1)

(57) [Claims] 1. A condensing lens having a counterbore in the center of the inner surface is covered so that the counterbore faces the opening of the housing.
An optical wireless receiver comprising a visible light cut filter interposed between the housing and the inner surface of the condenser lens, and a light receiving element provided in the housing disposed at a focal point of the condenser lens. In addition to leaving a protruding wall portion on the periphery of the counterbore on the inner surface of the inner surface, forming an annular concave portion other than the perimeter of the counterbore portion, pressing the visible light cut filter against the housing with the protruding wall portion, and connecting the visible light cut filter and the condenser lens. An optical wireless receiver, wherein a gap is formed between the annular concave portions.