JPH0729536Y2 - Laser floodlight - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laser projector which controls the operation of a laser light generating means by a key switch according to a laser radiation safety standard.

[0002]

2. Description of the Related Art Conventionally, as a photoelectric switch, one having a laser type projector having a semiconductor laser as a laser beam generating means and a photodetector having a light receiving element for receiving the laser beam from the laser type projector has been used. Yes, laser output of class IIIB or higher is also considered.

[0003]

[Problems to be Solved by the Invention] According to JIS C6802 Laser Radiation Safety Standard, laser output is Class IIIB.
In the above laser light application equipment, operation control of the laser light generation means by the key switch is obligatory, but in this case, if a key switch consisting of a normal key and a key cylinder is adopted as a conventional photoelectric switch, The key cylinder has to be incorporated into the laser type projector, which causes a problem of increasing the size.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a laser projector which can be downsized even if a key switch for controlling the operation of the laser light generating means is provided. There is.

[0005]

A laser type projector of the present invention is provided with a laser beam generating means in a main body, a card storage portion is formed on an outer peripheral wall of the main body, and a key having a permanent magnet is provided in the card storage portion. Magnetically sensitive element that detachably mounts a key card and outputs a key signal by the action of the magnetic force of the permanent magnet when the key card is mounted in the card storage portion in the main body in correspondence with the card storage portion. And a control means for operating the laser light generating means in response to the key signal of the magnetic sensitive element.

[0006]

According to the laser type projector of the present invention, the key switch for controlling the operation of the laser beam generating means is composed of the card storing section of the main body, the key card stored in the card storing section, and the key card. Since it is composed of a magnetically sensitive element that is sensitive to the magnetic force of the permanent magnet, the key switch itself is thin and can be downsized as a whole.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

First, the overall structure will be described with reference to FIGS. The main body 1 includes a case 2 made of zinc or aluminum die cast, and a cover 3 made of, for example, plastic.
The lens 4 and 5 are attached to the front portion inside thereof, and the semiconductor laser 6 as the laser light generating means is arranged via the holder 7 so as to face the lens 4 at the rear portion inside thereof. It is arranged. A circuit board 8 is arranged in the main body 1, and an electric circuit as shown in FIG. 6 is formed on the circuit board 8. The end of the cable 9 is hermetically attached to the rear end of the main body 1, and a plurality of lead wires 9a for the DC power supply and the signal are connected to the circuit board 8.

On the other hand, in the latter half of the upper wall of the cover 3 which is the outer peripheral wall of the main body 1, there is formed a rectangular card storage recess 10 which is a card storage portion, and the card storage recess 10 is inserted in the front wall. The recess 10a is formed, and the left side on the rear side,
An engaging recess 10b is formed on the right side wall. An elastic piece 11 is formed on the upper wall of the insertion recess 10a of the card storage recess 10, and an engaging hole 11a is formed in the elastic piece 11.

As shown in FIG. 3 to FIG. 5, the key card 12 is made of, for example, plastic and integrally molded in a thin rectangular shape. Engaging ridges 14 are formed on the left and right side walls on the end side. Further, on the upper wall of the key card 12, a plurality of groove portions 15 are formed at the base end side, and "K" is formed at the center.
A display portion 16 in which the letters "EY" are engraved is formed, and an arrow-shaped display portion 17 is formed at the tip side. Further, a fitting recess 18 that opens downward is formed in a substantially central portion of the key card 12, and a permanent magnet 19 is fitted and mounted in the fitting recess 18. A seal 20 is attached to the lower wall of the key card 12 so as to conceal the permanent magnet 19.

The permanent magnet 19 may be embedded in the key card 12 when the key card 12 is integrally molded.

Thus, the key card 12 is inserted and fitted into the card storage recess 10 of the main body 1 from the rear side, the tip end thereof is inserted into the insertion recess 10a, and the engaging projection 13 of the elastic piece 11 is formed. The engagement protrusion 11 is engaged with the engagement hole 11a, the engagement recess 14b is engaged with the engagement recess 10b, and thus is detachably mounted in the card storage recess 10. In this case, a Hall IC 21, which is a magnetically sensitive element, is mounted on the inner surface of the upper wall of the cover 3 so as to correspond to the card housing recess 10.
As described above, the key signal S21 (see FIG. 6) is output by the action of the magnetic force of the permanent magnet 19 corresponding to the permanent magnet 19 when the key card 12 is mounted in the card storage recess 10. Has become.

Now, the configuration of the electric circuit will be described with reference to FIG. The semiconductor laser 6 is composed of a laser diode 6a and a photodiode 6b, and the anode of the laser diode 6a and the cathode of the photodiode 6b are connected to a power supply line 22 to which a DC power supply voltage + V is applied. Also, the cathode of the laser diode 6a is NP
It is connected to the collector of N-type transistor 23,
The emitter of the transistor 23 is grounded.
Further, the anode of the photodiode 6b is grounded via a variable resistor 24 which is an output regulator.

In the differential amplifier 25, its inverting input terminal (-) is connected to the anode of the photodiode 6b, and its non-inverting input terminal (+) is a resistor 26 connected in series between the power supply line 22 and ground. And 27 at a common connection point. A switch (for example, a transistor) 28 described later is connected in parallel with the resistor 27. Further, the output terminal of the differential amplifier 25 is connected to the transistor 23 via a switch (for example, analog switch) 29 described later.
Is connected to the base of the base, and the base is grounded via the resistor 30.

Thus, the transistor 23 as described above,
Variable resistor 24, differential amplifier 25, resistors 26, 27 and 3
The 0-arrangement switches 28 and 29 form a drive circuit 31.

The control logic circuit 32 as the control means has three
It has three input ports I1 to I3 and three output ports O1 to O3, among which the input ports I1 and I2 are connected to the input terminals 33 and 34, and the input port I3 is an output terminal of the Hall IC 21. It is connected. In this case, the lead wire 9a is connected to the input terminal 33 from the side of the light receiver (not shown).
The synchronizing signal S33 is supplied via the controller 9 (see FIG. 1), and the input terminal 34 is supplied with the remote interlock signal S34 from the controller (not shown) side via the lead wire 9a. Then, the control logic circuit 32
The output port O3 of is connected to the base of an NPN transistor 35. In this transistor 35, the collector is connected to the power supply line 22 via a light emitting diode 36 as an alarm, and the emitter is grounded.

Incidentally, the drive circuit 31 and the control logic circuit 3
The controller 2 is supplied with a DC power supply voltage from the controller through the lead wire 9a, and the control logic circuit 32 operates based on various signals S21, S33 and S34 as described later.

Next, the operation of this embodiment will be described.

When the key card 12 is not mounted in the card storage recess 10, the control logic circuit 32 is
Key signal S21 from Hall IC21 to input port I3
Is not given, the switch 28 is turned on based on the output of the output port O1 and the output port O1
The switch 29 is turned off based on the output of 2, so that the transistor 23 is off, the laser diode 6a is not energized, and the laser diode 6a does not emit laser light, that is, does not operate.

When the key card 12 is mounted in the card storage recess 10, the magnetic force of the permanent magnet 19 causes the Hall IC.
Acting on 21, the Hall IC 21 outputs a key signal S21. Therefore, the control logic circuit 32 turns on and off the switch 29 in the same cycle as the synchronizing signal S33 by turning on and off the switch 28 in response to the key signal S21 supplied to the input port I3. Become.

Switch 28 is turned off and switch 29
When is turned on, the output voltage of the differential amplifier 25 is applied between the base and emitter of the transistor 23, and a base current corresponding to the output voltage flows through the transistor 23. In response to this, the laser diode 6a becomes active and a current flows through the laser diode 6a, and the laser diode 6a emits laser light. When the switch 28 is turned on and the switch 29 is turned off, the transistor 23 is also turned off, so that the laser diode 6a also stops emitting laser light. That is, the laser diode 6a has the synchronization signal S
The emission and the stop of the laser light are repeated in the same cycle as 33, so that the pulsed laser light is output.

The control logic circuit 32 receives the key signal S21 from the input port I3 and outputs it to the output port O3.
To output the high-level drive signal S32, the transistor 35 is turned on, and the current flows through the light emitting diode 36.
Emits light to notify that the laser diode 6a is outputting pulsed laser light.

The laser diode 6a emits laser light of the same output in two directions. One of them is emitted toward the lenses 4 and 5, and the other is the photodiode 6.
It is emitted to the light receiving surface of b. Therefore, the photodiode 6
b becomes conductive according to the laser light output of the laser diode 6a, and an output voltage V24 corresponding to it is generated between both terminals of the variable resistor 24. The reference voltage V27 is generated between both terminals of the resistor 27, and the differential amplifier 25
Will output an output voltage which is the difference between the reference voltage V27 and the output voltage V24. Since the output voltage of the differential amplifier 25 is applied between the base and the emitter of the transistor 23, the transistor 23 controls the current flowing through the laser diode 6a, so that the laser light emitted from the laser diode 6a is emitted. The output is controlled to be constant.

When the remote interlock signal S34 is applied to the input port I2, the control logic circuit 32 turns on the switch 28 and turns off the switch 29 to stop the laser light emission of the laser diode 6a. The transistor 35 is turned off to stop the light emission of the light emitting diode 36.

As described above, according to this embodiment, the card storage recess 10 is formed in the upper wall of the cover 3 which is the outer peripheral wall of the main body 1, and the thin key card 12 can be inserted into and removed from the card storage recess 10. Be sure to wear it, and the key card 1
2 is mounted in the card storing recess 10, the key signal S21 is received by the magnetic force of the permanent magnet 19 of the key card 12.
The Hall IC 21 for outputting the above is provided in the main body 1, and the operation of the laser light emission of the laser diode 6a is stopped and controlled based on the key signal S21. Therefore, the laser diode 6a does not output the laser beam unless the key card 12 is mounted in the card storage recess 10, and the same function as that of the conventional key switch can be obtained.

Further, according to the present embodiment, the key switch includes the card storing recess 10 of the cover 3 and the key card 12.
And because it is made up of Hall IC21 etc. and is thin,
Unlike the prior art, the laser projector can be downsized as a whole.

In the above embodiment, the control logic circuit 3
Although the operation of the laser diode 6a is controlled to be stopped by turning off the transistor 23 when the key signal S21 is not applied to the signal 2, instead, for example, by cutting off the supply of the DC power supply voltage to the drive circuit 31. The operation of the laser diode 6a may be stopped and controlled.

Further, in the above embodiment, the Hall IC 21 is provided as the magnetically sensitive element, but instead, for example, a normal Hall element or a reed switch may be provided.

Further, in the above embodiment, the key card 12 is used.
Although one permanent magnet 19 is provided on the main body 1 and one Hall IC 21 is provided on the main body 1 in correspondence therewith, for example, a plurality of permanent magnets and a plurality of magnetic sensitive elements corresponding thereto may be provided. You may

Besides, the present invention is not limited to the above-mentioned embodiments, and it is needless to say that the present invention can be appropriately modified and implemented without departing from the scope of the invention.

[0031]

As described above, according to the laser type projector of the present invention, a key card having a permanent magnet is detachably mounted in the card housing of the main body, and the key is acted upon by the action of the magnetic force of the permanent magnet at the time of mounting. The main body is provided with a magnetically sensitive element for outputting a key signal, and the operation of the laser light generating means is controlled according to the presence or absence of the key signal, so that there is a practical effect that the size can be reduced. .

[Brief description of drawings]

FIG. 1 is a vertical side view showing an embodiment of the present invention.

FIG. 2 is a perspective view of a main part

FIG. 3 is a top view of a key card.

FIG. 4 is a bottom view of the same.

[Fig. 5] Side view of the same section

FIG. 6 is a configuration diagram of an electric circuit

[Explanation of symbols]

In the drawings, 1 is a main body, 2 is a case, 3 is a cover, 6 is a semiconductor laser (laser light generating means), 10 is a card storage recess (card storage), 12 is a key card, 19 is a permanent magnet, and 21 is Hall IC (magnetic sensitive element), 23 is a transistor, 25 is a differential amplifier, 28 and 29 are switches,
31 is a drive circuit, 32 is a control logic circuit (control means)
Indicates.

Claims (1)

[Scope of utility model registration request] 1. A laser beam generating means provided inside the main body, a card storage portion formed on an outer peripheral wall of the main body, and a key card that is detachably attached to the card storage portion and has a permanent magnet. A magnetic sensitive element which is arranged in the main body in correspondence with the card storage section and outputs a key signal by the action of the magnetic force of the permanent magnet when the key card is mounted in the card storage section, and the magnetic sensitive element. And a control means for operating the laser light generating means in response to the key signal.