JPH0236321A - Optical wireless receiver - Google Patents

Abstract

PURPOSE:To prevent the unevenness of color from occurring by leaving a projecting wall part on the periphery of a counter bore part on the inner surface of a condensing lens and also forming a gap obtained by an annular recessed part between a visible light cut filter and the condensing lens. CONSTITUTION:The projecting wall part 8 is left on the periphery of the counter bore part 3c on the inner surface of the condensing lens 3 and the annular recessed part 7 is formed, where the visible light cut filter 6 is pressed by the projecting wall part 8. Therefore, a pressing member is not needed and the constitution of the title receiver is simplified even if the filter 6 is disposed by being separated from the inner surface 3b of the lens 3. Since the gap obtained by the recessed part 7 is formed between the filter 6 and the inner surface 3b of the lens 3, condensing characteristic is not ruined and the unevenness of color can be prevented from occurring.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an optical wireless receiver.

[Prior Art] Conventionally, in order to be able to receive light from a wide range, this type of optical wireless receiver It is designed to be embedded. By the way, optical wireless receiver
is formed by covering the opening 2 of the housing 1 with a condenser lens 3, as shown in FIG.
It is formed of a wide-angle lens having a convex curved surface and a counterbore 3c at the center of the inner surface 3b, and is arranged with the counterbore 3c facing the opening 2, and the light receiving element 4 disposed in the housing 1.
is arranged at the condensing point of the condensing lens 3. Further, a visible light cut filter 6 is disposed between the condenser lens 3 and the opening 2 of the housing 1.
A signal processing circuit section 5 equipped with an amplifier and the like for amplifying the light-receiving signal output from the light-receiving element 4 is provided therein. In addition, FIG. 10 is a light condensing characteristic diagram when the curved surfaces of the counterbore portions 3c of the outer surface 3a and inner surface 3b of the condenser lens 3 are respectively designed with appropriate exponential functions to obtain desired light condensing characteristics. be.

[Problem M to be Solved by the Invention] However, in the above-mentioned conventional example, as shown by diagonal lines in FIG. Color unevenness (parts in close contact with the visible light cut filter 6 become black) is likely to occur,
There was a problem in that the appearance was unsightly. In addition, in order to prevent color unevenness, as shown in FIG.
It is conceivable to apply a texture 9 to the inner surface 3b of the lens, but there is a problem that the multiple reflected light between the visible light cut filter 6 and the condensing lens 3 cannot be used effectively (used as indirect signal light). Furthermore, as shown in Figure 9,
It is also possible to inject a filler 10 between the condenser lens 3 and the visible light cut filter 6 with a refractive index between the condenser lens 3 and the path to prevent irregular adhesion. There are problems in that air bubbles may enter and the light focusing properties may be impaired, and that a filler injection step is required separately in the assembly process, increasing the number of steps.

The present invention has been made in view of the above points, and its purpose is to provide a light beam that can eliminate the occurrence of color unevenness without impairing the light collection characteristics, and that is simple in structure and easy to assemble. The purpose is to provide a wireless receiver.

[Means for Solving the Problems] The optical wireless receiver of the present invention includes a condenser lens having a counterbore in the center of the inner surface, which is covered with the condenser lens so that the counterbore faces the opening of the housing, and the housing and the condenser lens In an optical wireless receiver in which a visible light cut filter is interposed between the inner surface and the light receiving element provided in the housing and the light receiving element is arranged at the condensing point of the condensing lens, the periphery of the counterbore on the inner surface of the condensing lens. In addition to leaving a protruding wall part in the area, an annular recess is formed outside the periphery of the counterbore part, and the visible light cut filter is pressed against the housing by the protruding wall part, and the annular recess is formed between the visible light cut filter and the condensing lens. This created a gap.

[Function] The present invention is configured as described above, and provides an optical wireless receiver in which a condenser lens having a counterbore in the center of the inner surface is covered over an opening of a housing via a visible light cut filter. A projecting wall is left at the periphery of the counterbore on the inner surface of the housing, and an annular recess is formed, and the visible light cut filter is pressed against the housing by the projecting wall, and the annular recess is formed between the visible light cut filter and the condenser lens. Since the gap is formed, it is possible to eliminate the occurrence of color unevenness without impairing the light collection characteristics, and it is possible to provide an optical wireless receiver that has a simple configuration and is easy to assemble.

[Example] Figure 1 shows a schematic configuration of the main parts of an example of the present invention.
A condenser lens 3 having a counterbore 3c at the center of the inner surface 3b is covered so that the counterbore 3c faces the opening 2 of the housing 1, and a visible light cut filter is provided between the housing 1 and the inner surface 3b of the condenser lens 3. In the optical wireless receiver similar to the conventional example in which the light receiving element 4 provided in the housing 1 is disposed at the condensing point of the condensing lens 3, a counterbore in the inner surface 3b of the condensing lens 3 is provided. A projecting wall portion 8 is left on the periphery of the portion 3c, and an annular recess 7 is formed outside the periphery of the counterbore portion 30, and the visible light cut filter 6 is pressed against the housing 1 by the projecting wall portion 8, and the visible light cut filter 6 and the condensing A gap is formed between the optical lens 3 and the annular recess 7. Note that a projecting wall 3d is provided on the circumference of the condenser lens 3, and is attached to the housing 1 by ultrasonic welding. Alternatively, 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 unit 5, which is formed by a light receiving module 20, a signal processing circuit 21, a signal output circuit 22, and a power supply circuit 23.

FIG. 3 shows a schematic configuration of a remote monitoring and control system using the optical wireless receiver A terminal device 33, a wireless relay terminal device 37, an external interface terminal device 38, and a pattern setting terminal device 39 are connected by a pair of signal lines 34, and transmissions sent from the central control device 31 to the signal line 34 are connected. As shown in FIG. 4(a), the signal Vs includes a start pulse signal ST indicating the start of signal transmission, a mode data signal MD indicating the signal mode, and 8-bit address data for calling three terminals 32.3337. Address data signal AD to be transmitted, control data signal CD to transmit control data to control load, ~L, checksum data signal C8, and return standby to set return period from terminals 32, 33, 37 to 39. Bipolarity (±24V
) is a time-division multiplexed signal in which data is transmitted using pulse width modulation. Each terminal 32.33
．． 37 to 39, when the address data of the transmission signal Vs received via the signal line 34 and its own unique address data match, the control data of the transmission signal Vs is taken in, and the return standby signal WT of the transmission signal Vs is read. The monitoring data signal is sent back as a current mode signal (a signal sent by short-circuiting the signal lines 34 via an appropriate low impedance) in synchronization with the current mode signal. Furthermore, the central control device 31 includes a dummy signal transmitting means that always sends out a dummy transmission signal in which the mode data signal MD is in a dummy mode, one of the monitoring terminals 32 or the wireless relay terminal 37, and an external interface terminal. 38. When the interrupt signal V1 as shown in FIG. 4(b) returned from the three pattern setting terminals is received, the left one-input generation terminals 32.37 to 3 are detected and the corresponding one is detected. Terminal 32
．． Interrupt processing means is provided for accessing 37 to 39 and returning monitoring data. The central control device 31 also uses the monitoring data sent back to the central control device 31 from the monitoring terminal 32 or the wireless relay terminal 37, the external interface terminal 38, and the pattern setting terminal 39 as described above. and the corresponding load,
-Create control data to be transmitted to the control terminal device 33 that controls L4, and time-division multiplex transmit the control data to the control terminal device 33 via the signal line 34 to control the load L I" L4. It is meant to be controlled.

Here, the wireless relay terminal device 37 is a terminal device that performs data relay of an optical wireless system consisting of an optical wireless transmission By, an optical wireless receiver X according to the present invention, and a wireless signal line 40, and an optical wireless transmitter Y. The optical wireless receiver X receives the optical signal transmitted from the optical wireless receiver X, receives the received data via the wireless signal line 40, and transfers this data to the central controller 31. . Further, the external interface terminal 338 is a terminal device that performs data transmission with the external control device 41, and the three pattern setting terminal devices transmit pattern control data input from the data input section 42 to the central control device 31. This is the terminal device for the transfer. In addition, distribution board 3
The monitoring terminal device 32 and the control terminal device 33 arranged in the relay control panel 36a have the dimensions agreed upon in the distribution board agreement, and their control outputs can be used to control the load control remote control relay (also by hand switch). A latching relay (35) that can be turned on and off is controlled.

In the present embodiment, a protruding wall part 8 is left at the periphery of the counterbore part 3c on the inner surface of the condenser lens 3, and an annular recessed part 7 is formed, and the visible light cut filter 6 is formed in the protruding wall part 8. Since the visible light cut filter 6 is pressed against the housing 1, even if the visible light cut filter 6 is disposed away from the inner surface 3b of the condenser lens 3, a holding member for the visible light cut filter 6 is not required and the configuration can be simplified. It is simple and easy to assemble. In addition, visible light cut filter 6
Since a gap is formed by the annular recess 7 between the condensing lens 3 and the inner surface 3b of the condensing lens 3, it is possible to eliminate color unevenness without impairing condensing characteristics. Although the width of the protruding wall portion 8 is set to an inconspicuous level, the color of the close contact portion of the distal end surface of the protruding wall portion 8 will appear different from other portions. However, since this color unevenness is a color unevenness in regular minute portions, it does not impair the appearance. Further, the depth of the four annular portions 7 for forming the gap may be set to such an extent that multiple reflections between the visible light cut filter 6 and the inner surface 3b of the condenser lens 3 can be effectively utilized.

[Effects of the Invention] The present invention is constructed as described above, and provides an optical wireless receiver 83 in which a condensing lens having a recessed portion at the center of the inner surface is covered with the opening of the housing via a visible light cut filter.
In this method, a projecting wall is left at the periphery of the counterbore on the inner surface of the condenser lens, and an annular surrounding portion is formed, and the visible light cut filter is pressed against the housing by the projecting wall, and the visible light cut filter and the condenser lens are Since a gap is formed between the four annular parts, it is possible to eliminate the occurrence of color unevenness without impairing the light collection characteristics, and furthermore, it is possible to provide an optical wireless receiver that is simple in configuration and easy to assemble. There is.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a main part of an embodiment of the present invention, FIG. 2 is a circuit diagram of the same main part, and FIG. 3 is a schematic configuration diagram of a remote monitoring and control system using an optical wireless receiver according to the present invention. FIG. 4 is an explanatory diagram of the same operation as above, FIG. 5 is a cross-sectional view showing an example of the arrangement of the optical wireless receiver according to the present invention, FIG. 6 is a cross-sectional view showing the schematic configuration of the main part of the conventional example, and FIG. Same operation explanatory diagram, No. 8
9 and 9 are sectional views of main parts of other conventional examples, respectively, and FIG. 10 is an explanatory diagram of the condensing characteristics of the condensing lens. 1 is a housing, 2 is an aperture, 3 is a condensing lens, 3a is an outer surface, 3b is an inner surface, 3c is a counterbore, 4 is a light receiving element, 5 is a signal processing circuit, 6 is a visible light cut filter, 7 is an annular recess , 8 is a projecting wall portion. Agent Patent Attorney Ishi 1) Chief 7 Figure 5 Figure 12 38 Figure 9 Bacteria 'JI; Figure 10

Claims (1)

[Claims] (1) Covering a condensing lens having a counterbore in the center of the inner surface so that the counterbore faces the opening of the housing, interposing a visible light cut filter between the housing and the inner surface of the condenser lens, and In an optical wireless receiver in which a light-receiving element provided in a housing is arranged at a condensing point of a condensing lens, a projecting wall is left at the periphery of the counterbore on the inner surface of the condenser lens, and an annular recess is left outside the periphery of the counterbore. An optical wireless receiver characterized in that the visible light cut filter is pressed against the housing by the projecting wall part, and a gap is formed between the visible light cut filter and the condenser lens by the annular recess.