JPS60180230A - Optical space transmitter - Google Patents

Abstract

PURPOSE:To attain sure optical communication without requiring so much accuracy for the directivity of transmission/reception by applying optical communication between a satellite head possible for transmission/reception of light in all directions of surrounding and a terminal head whose transmission/reception direction is unidirectional. CONSTITUTION:Plural light emitting elements are mounted in a hole 15 of a heat sink 14 fixed to a brachet 13 in the inside of a semispherical cover 6 tixed to a ceiling face 40 in a room, the light emitting element is mounted on a printed board 16 so that the light is transmitted to the entire surrounding at the outside of a cover 6. A photodetector 11 is fitted to a retainer in the direction of the surrounding 4 of the cover 6 and a rubber cover 12 preventing the detour of the light from the light emitting element in the inside is provided under the retainer while being adhered closely on the inside face of the cover 6 to constituted a satellite head 41. In performing optical communication between the satellite head 41 and the terminal head 42 provided with the light emitting element and photodetector in one direction, the sure optical communication is performed surely even if no strict accuracy exists in the directionality of the head 42.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to an optical space transmission device that performs optical communication without using optical fibers.

<Technical background> Optical communication equipment that uses optical fiber cables requires cable installation work between the optical communication equipment that transmits and receives light, and when moving equipment due to layout changes etc. I have to do it again. Also,
Optical fiber cables can be damaged and must be handled with care.
Cable installation work is time consuming and the equipment cannot be moved easily.

In order to eliminate the problems caused by using optical fiber cables, an optical space transmission device has been developed that incorporates a light emitting element and a light receiving element within an optical communication device and directly transmits and receives light between each device without using optical fibers. ing. In such an optical space transmission device, in order to ensure reliable optical transmission between devices performing optical communication, it is necessary to accurately match the directions of light transmission and reception of each device. Further, it is desirable that the optical space transmission device has a simple structure and is easy to assemble.

<Prior art and problems> As a conventional optical space transmission device, a terminal head is installed with a built-in light-emitting element and a light-receiving element for optical communication, and the direction of transmitting and receiving light is set on the front. The applicant has developed an optical space transmission device in which separate terminal heads are arranged with their transmitting and receiving directions aligned, and optical communication is performed between both terminal heads. In such conventional optical space transmission devices, optical communication is performed between terminal heads with only one transmitting and receiving surface formed on one side, which requires precision in matching the direction of transmitting and receiving light, making installation work time-consuming. .

<Object of the Invention> The present invention has been made in view of the above-mentioned drawbacks of the prior art, and provides an optical space transmission that achieves reliable optical transmission without requiring much precision in the directionality of the transmitting and receiving directions and that facilitates installation work. The purpose is to provide equipment.

<Constitution of the Invention> In order to achieve this object, the present invention provides a plurality of light beams for transmitting communication light in substantially all directions outside the cover, inside the hemispherical cover fixed to the indoor ceiling, valve surface, or wall surface. A satellite head is constructed by providing a plurality of light-emitting elements and a plurality of light-receiving elements arranged to be able to receive light from substantially all directions outside the cover, and a terminal head with built-in light-emitting elements and light-receiving elements for optical communication. The transmitting and receiving direction is arranged to face the satellite head, and optical communication is performed between the satellite head and the terminal head.

<Embodiments of the invention> FIG. 1 is a block diagram of an optical space transmission device according to the present invention.

A hemispherical satellite head 41 is fixed to an indoor ceiling 40. A light emitting element (not shown) and a light receiving element (not shown) for optical communication are installed in the satellite head 41 . A terminal head 42 that performs optical communication with the satellite head 41 is installed at an appropriate position in the room. A plurality of light-emitting elements and light-receiving elements in the satellite head 41 are fixedly provided at positions where they can emit light in all directions around the hemispherical cover and receive light from all directions around the hemispherical cover. On the other hand, the light transmitting/receiving surface of the terminal head 42 is only the front surface, and the vertical angle and horizontal direction of this transmitting/receiving direction can be adjusted. Front surface (transmission/reception surface) f of this terminal head 42: Arranged toward the satellite head 41 to perform optical communication between the two.

43 and 44 are terminal devices for inputting or outputting data transmitted between the satellite head 41 and the terminal head 42, respectively.

FIG. 2 is an internal side view of the satellite head according to the present invention, and FIG. 3 is a plan view thereof. Adapter 1 is connected to the ceiling (
(not shown) using suitable means such as screws. A substrate 2 is fixedly held to this adapter 1 by step pins 3. As shown in FIG. 3, the board 2 is provided with an egg-shaped deformed elongated hole 17 whose width changes, and a stepped pin 3 fixed to the adapter 1 is provided.
is inserted into the enlarged part of the deformed elongated hole 17, the board 2 is rotated, and the stepped pin 3 is placed in the reduced part of the deformed elongated hole 17.
The enlarged head of the board 2 is supported and further fixed with screws 46. This configuration allows for easy and reliable mounting. An intermediate frame 4 is fixed to the substrate 2 with screws 5. A hemispherical cup 4-6 (made of acrylic, for example) is attached to this intermediate frame 4. This hemispherical cover 6 not only hides the interior but also acts as a filter for transmitting and receiving light.
It is made of a colored transparent material that transmits light of the wavelength of the light receiving element and blocks light of other wavelengths. The hemispherical cover 6 is attached to the intermediate frame 4 via a hinge 45 (FIG. 3) so that it can be opened and closed, and a bladder 5. It is fixed with screws 7 (FIG. 2) via holes 27. As shown in FIG. 6, when the screw 7 is tightened and fixed, its head is located in the counterbore hole 28 of the intermediate frame 4, and the hemispherical cover 6 does not open, but the screw is loosened and its head is located in the counterbore hole 28.
8, the threaded portion passes through the slit 29 (FIG. 7) provided below the counterbore hole 28, and the hemispherical cover 6 opens. A shield box 8 is fixed to the board 2, and a printed board (not shown) is housed inside. A hole 22 is formed in the center of the adapter 1, through which the electric cable 10 passes. Electrical cable 10 connects with connector 9. As shown in FIGS. 4 and 5, the adapter 1 is further formed with a groove 23 for allowing a cable to be introduced from the side. A step 26 is formed below this groove 23, and a cable drop prevention plate 24 is fixed with screws 25. 21 is a hole through which a screw for attaching an adapter is passed.

Light-receiving elements 11 are attached to the hemispherical cover 6 in four directions around it. As shown in FIG. 8, each light-receiving element 11 is mounted inside a fixing ring 32, held by a claw 32a at the end of the fixing ring 32, and is pressed by a presser plate 31 via a rubber ring 33, and then screwed into the fixing ring 32.
Fixed at 7. A rubber cover 12 is provided around the fixing ring 32 with its tip surface in close contact with the inner surface of the hemispherical cover 6 to prevent light from going around from the light emitting elements inside the satellite head. This rubber cover 12 prevents the light emitted by the light emitting element in the satellite head from being received by the light receiving element in the same satellite head. A printed board 16 is provided in the center of the interior of the satellite head, and a plurality of light emitting elements 19 that emit light toward the front (downward) of the satellite head are mounted inside the radiation fins 20. Brackets 13 are fixed on the four sides of the cylinder plate 16 for mounting additional light emitting elements (not shown) that emit light in four directions around the satellite head. The light emitting element is mounted in the hole 15 of the heat sink 14, and the heat sink 14 is fixed to the bracket 13. Each bracket 13 equipped with a light emitting element has four light receiving elements 11.
0 (see FIG. 3). 41
Light emitting element and printed board 16 on solid bracket 13
The upper light emitting element 19 emits light all around the outside of the hemispherical cover 6. In addition, 4 ([i!it light receiving element 11
Therefore, light from all around the outside of the hemispherical cover 6 is received. Reference numeral 18 denotes a heat radiation hole provided in the substrate 2.

<Effects of the Invention> As explained above and in addition, the optical space transmission device according to the present invention has a satellite head that can transmit light in all surrounding directions and receive light from all surrounding directions, and a satellite head that can transmit and receive light in one direction. Since optical communication is performed between the terminal heads, reliable optical transmission is achieved without requiring precision in the directionality of the terminal heads, installation work of the terminal heads is easily performed, and highly reliable optical communication is achieved.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of an optical space transmission device according to the present invention, FIGS. 2 and 3 are a side view and a plan view of the inside of a satellite according to the present invention, and FIG. 4 is a diagram of a satellite according to the present invention. 5 is a partial sectional view of the adapter of FIG. 4; FIGS. 6 and 7 are a sectional view and a front view of the hemispherical cover fixing part of the satellite head of FIG. 2; FIG. 8 is a plan view of the adapter of the head; This figure is a detailed view of the light receiving element section of the satellite head shown in FIG. 2. 6... Hemispherical cover, 11... Light receiving element, 19...
Light emitting element, 40...Ceiling, 41...Satellite head, 42...Terminal head. Patent Applicant Fujutsu Co., Ltd. Patent Application Agent Patent Attorney Akira Seki Patent Attorney Kazuyuki Nishidate 1) Yukio Patent Attorney Akira Yamaguchi Figure 1 Figure 2 T':) 13 Figure 3 Figure 4 Figure 5 Figure 8 '320

Claims (1)

[Claims] 1. Inside the hemispherical force fixed to the indoor ceiling or wall, there are a plurality of light emitting elements that emit communication light in substantially all directions outside the cover, and from substantially all directions outside the cuckoo. a plurality of light-receiving elements arranged to be able to receive the light of An optical space transmission device that performs optical communication between satellite heads and terminal heads.