JP2517378Y2 - Optical data transmission device - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to an optical data transmission device for transmitting data by light through a space, and in particular, it can project and receive light only by changing the mounting direction of a light emitting and receiving window provided in its case. It relates to a structure that can change direction.

[Conventional technology]

Two optical data transmission devices (1) as shown in FIG.
Used as a pair, they send and receive digital data by light between places separated by space. As shown in FIG. 9, this typical circuit configuration has a data input / output interface (2), an input data modulation circuit (3),
A light emitting element (4) such as an LED that projects modulated light, a light receiving element (5) such as a phototransistor that receives the modulated light emitted from the opposite optical data transmission device (1), and data is received from the received modulation signal. It is composed of a demodulation circuit (6) for taking out and outputting to the outside through the input / output interface (2).

The optical data transmission device (1) is used, for example, to send and receive destination data between an automated guided vehicle (7) and a station (8) as shown in FIG. In addition to this, there are transmission / reception of control signals between the control device and the repeater in the stacker crane, and data transmission / reception between microcomputers.

In this optical data transmission device (1), the case is made thin so that the mounting space can be made small, and in order to facilitate the mounting, a light projecting / receiving window (9) is provided on the front face as shown in FIG. A head-on type and a side-on type in which a light projecting / receiving window (9) is provided on the top surface as shown in FIG. 11 are manufactured. By preparing two types with different light emitting and receiving directions by 90 °, the mounting direction can be changed according to the mounting location, as shown in Fig. 12 (a), (b) and (c).
Space can be used effectively.

Since all of the above-mentioned types have the same data transmission function, a common circuit board on which the components are assembled is used and the circuit boards are assembled on different cases. At the time of this assembly, the top surface light emitting and receiving type shown in FIG. 11 has an LED (4) as a light emitting element and a phototransistor as a light receiving element on the circuit board (10) as shown in FIG. Fix (5) upright. Further, as shown in FIG. 14, the front projection / reception type shown in FIG. 8 has a sub-board (11) in which an LED (4) which is a light emitting element and a phototransistor (5) which is a light receiving element are vertically provided. Fixed to the circuit board (10).

[Problems to be solved by the device]

In the above optical data transmission device, the difference between the front light emitting / receiving type (head-on type) and the top surface light emitting / receiving type (side on type) is that the light emitting / receiving window (9) is on the top surface or on the front surface. The only difference is the shape of the case, and the difference in the mounting direction of the light emitting / receiving element (4) and the light receiving element (5).

However, since the devices are supplied to users as different models, it is necessary to manufacture them separately and keep a predetermined number of them in inventory, which is a problem to reduce the production / management cost. Also, from the user's point of view, once the model has been decided and the product has been obtained, it may not be possible due to the mounting space even if the mounting location or mounting direction is changed later.

Therefore, an object of the present invention is to provide an optical data transmission device capable of easily switching the light emitting / receiving direction between the front side and the top side in one model.

[Means for solving the problem]

This invention is a modulation circuit that converts input data into a modulation signal, a light projecting element that receives the modulation signal and projects the modulated light to a counterpart device, a light receiving element that converts the modulated light incident from the counterpart device into an electrical signal, and a light receiving element In a case of an optical data transmission device in which a demodulation circuit for demodulating an output and extracting a data signal, and an input / output interface are assembled in one thin box-shaped case to mutually transmit and receive data to and from a partner device Of the front lid, which has a notch formed in a corner portion where the front surface and the top surface intersect, and an L-shaped cross section that is composed of two orthogonally symmetrical symmetrical pieces, and which is fitted into the notch. With a light projecting / receiving window formed on one piece, two reflectors vertically installed on the other piece in a state of being inclined and facing the light projecting / receiving window, and a direction parallel to each piece of the front lid, Make sure that the two reflectors face each other. An optical data transmission device that has a light emitting element and a light receiving element fixed inside the switch, and can switch the light emitting and receiving direction between the front side and the top side by reversing the mounting direction of the front lid. provide.

[Action]

In the above optical data transmission device, since both reflectors are attached with an inclination of 45 ° with respect to the light projecting / receiving window, the light emitted from the light projecting element hits the opposing reflector and is bent 90 ° in the direction. Go out from the light emitting / receiving window. In addition, the light incident on the light emitting / receiving window has a direction of 90 ° due to the reflecting plate facing the light receiving element.
It is bent and enters the light receiving element.

This reflection state does not change even if the mounting direction of the front lid is reversed. Therefore, it is possible to switch the light emitting / receiving direction only by selecting whether the front lid is attached so that the light emitting / receiving window faces the top surface of the case or the front surface.

〔Example〕

FIG. 1 shows the appearance of an optical data transmission device (12) which is an embodiment of the present invention. (13) is a thin box-shaped case, (14) is a front lid with an L-shaped cross section, Box-shaped case (13)
It is screwed and fixed to the notch formed at the corner where the front surface and the top surface intersect. (15) is a light projecting / receiving window provided on one piece of the front lid (14), and (16) is a display window provided on the top plate (13a) of the box-shaped case (13). This optical data transmission device (12) includes a light emitting element (4), a light receiving element (5), a modulation circuit (3), a demodulation circuit (6), and an input / output interface (2) as described in FIG. The connector for external connection of the input / output interface (2) is disposed in a connector square hole (not shown) provided on the rear surface of the case. This optical data transmission equipment (12)
Transmits and receives modulated light by the light emitting element (4) and the light receiving element (5) built in through the light emitting and receiving window (15) of the front lid, and transmits and receives data. During this transmission / reception, a plurality of display elements (LEDs) (not shown) arranged inside the display window (16) on the top surface blink according to the contents. With this, the transmission / reception status can be monitored.

As shown in FIG. 2, the feature of this invention is to change the direction of light emission and reception by simply changing the mounting direction of the front lid (14) to the notch (17) of the box-shaped case (13). It is possible to change 90 degrees to the side and the top side.

The structure of the front cover (14) is as shown in FIGS. 3 and 4.

The front lid (14) is a rectangular piece (14a) of orthogonal symmetrical shape.
It has an L-shaped cross section consisting of (14b) and has one piece (14
A light projecting / receiving window (15) is opened in a), and a window plate (18) made of, for example, a red acrylic resin is screwed and fixed therein from the inside. The other piece (14b) has two reflectors (19) (2
0) is tilted with respect to the light emitting / receiving window (15) by screwing the triangular prism shaped mirror mount (21) (for example, 45).
It is installed vertically at an inclination of °. Where reflectors (19) (20)
Is a surface reflecting mirror made of a hard glass plate plated with aluminum, and is fixed to the mirror mount (21) with an adhesive.
The front lid (14) is fitted in the notch (17) of the box-shaped case (13) shown in FIG. 2 in the assembled state as shown in FIG. 4, and is provided one step lower inside the notch. Flange (17
It is fixed to a) with screws. The notch (17) has the same shape as the front cover (14), and the front cover (14) and the box-shaped case (13) are flush with each other by fitting.

On the other hand, the light projecting element (4) and the light receiving element (5) are
As shown in FIGS. 5 and 6, the wiring board (22) is installed in the box-shaped case (13) in parallel with the top plate (13a). In this planting, a rectangular notch (22a) is provided in the front part of the wiring board (22), and the light projecting element (4) and the light receiving element (5) face each other in the notch (22a) in a protruding state. The direction of light emission and light reception is made parallel to the light emission and reception window (15) of the front lid (14).

When the light projecting element (4) and the light receiving element (5) are set up in this manner, the mounting direction of the front lid (14) is as shown in FIGS. ) Facing the front or as shown in FIG. 7 when the light projecting / receiving window (15) faces the top surface, the wiring board (22) is cut into the notch (22a). The two reflecting plates (19) (20) that enter the light reflect the light projected by the light projecting element (14) toward the light projecting / receiving window (15) and reflect the light entering the light projecting / receiving window (15). It is reflected toward the light receiving element (5).

As a result, the front lid (1
By simply reversing the mounting direction in 4), the light emitting and receiving directions can be switched between the front side and the top side.

The light emitting element (4), the light receiving element (5) and the reflector (1
9) The mounting method of (20) is such that, even if the front cover (14) is turned, the projection and reception windows (15) will always emit and receive light when viewed from the outside.
It suffices to meet the condition that it is conducted through For example,
The reflectors (19) (20) may be mounted parallel to each other.

[Effect of device]

The optical data transmission device provided by this invention can be used by switching one type between the front light emitting / receiving type (head-on type) and the top surface light emitting / receiving type (side on type) simply by changing the mounting direction of the front lid. . Therefore, production and management can be performed with one model, and the cost can be reduced. Also, the user can easily change the light projecting and receiving directions by changing the direction of the front cover (14) according to the installation place during the installation work, so that the device is easy to use.

[Brief description of drawings]

FIG. 1 is a perspective view showing the external appearance of an embodiment of the optical data transmission device of the present invention, and FIG. 2 is a perspective view showing the positional relationship between the box-shaped case and the front lid in the device shown in FIG. FIG. 3 is a perspective view showing a front lid and a disassembled state of a window plate and a reflection plate of a light emitting / receiving window assembled to the front lid, and FIG. 4 is a perspective view showing an assembled state of each component shown in FIG. 5 is a sectional view of the front portion of the apparatus shown in FIG. 1, and FIGS. 6 and 7 are a reflection plate, a light emitting / receiving window, and a light projecting state in which the front lids are attached in different directions. It is a perspective view which shows the positional relationship of an element and a light receiving element. FIG. 8 is a perspective view of a conventional optical data transmission device of front projection / reception type, FIG. 9 is a block diagram showing a schematic internal configuration of a pair of optical data transmission devices, and FIG. 10 is a usage example of the optical data transmission device. FIG. 11 is a perspective view of an unmanned guided vehicle and its station, and FIG. 11 is a perspective view of a conventional optical data transmission device of a ceiling projection / reception type.
Figures (a), (b), and (c) show different combinations of two pairs of optical data transmission devices, respectively, and Figs. 13 and 14 show the top-side light-receiving type and the front-side light-receiving type. It is a perspective view which shows the attachment structure of the light-projecting element and light-receiving element in a type. (2) ... I / O interface, (3) ... Modulation circuit, (4) ... Projector element, (5) ... Receiving element, (6)
... Demodulation circuit, (12) ... Optical data transmission device, (13) ...
… Box-shaped case, (13a) …… Top plate, (14) …… Front lid,
(14a) (14b) ... pieces that compose the front cover, (15) ... light-transmitting / receiving window, (17) ... notches, (18) ... window plate, (19)
(20) …… Reflector, (21) …… Mirror mount.

Claims (1)

(57) [Scope of utility model registration request] 1. A modulation circuit for converting input data into a modulation signal,
A light projecting element that receives the modulated signal and projects the modulated light to the other device, a light receiving element that converts the modulated light that enters from the other device into an electrical signal, a demodulation circuit that demodulates the light receiving output of the light receiving element to extract the data signal, and an input In an optical data transmission device in which the output interface was assembled in a thin box-shaped case and data was transmitted and received to and from the other device, it was formed at the corner where the front and top surfaces of the case intersect. It has a notch and an L-shaped cross section consisting of two pieces that are symmetrical and orthogonal to each other, and has a front lid that fits in the notch, a light emitting / receiving window formed on one piece of the front lid, Inside the case, the two reflectors hung vertically on the other piece while facing the window and facing the two reflectors in a direction parallel to each piece of the front lid. With fixed light emitting element and light receiving element By reversing the direction of attachment of the front cover, the optical data transmission system is characterized in that so as to switch the light emitting and receiving direction to the front side and the top side.