JP2013004917A - Laser diode module, laser diode device, and image projection apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a laser diode module that prevents being easily transferred, a laser diode device including the laser diode module, and an image projection apparatus including the laser diode module or the laser diode device.SOLUTION: A laser diode module of the present invention is obtained by integrating, as a single module, a laser diode, and current control means for controlling a current that flows through the laser diode.

Description

  The present invention relates to a laser diode module having a laser diode, a laser diode device including the laser diode module, and an image projection device including the laser diode module or the laser diode device.

  In recent years, products equipped with laser diodes that emit blue and green light have begun to spread, and in image projection apparatuses (hereinafter sometimes referred to as projectors), products that use laser diodes as light sources instead of conventional lamps. Has appeared. On the other hand, when such projectors increase in the market, it becomes easier for ordinary people to obtain laser diodes.

  The projector uses a laser having a large output power in order to obtain sufficient brightness of the display screen. For this reason, it is dangerous if a general person obtains a laser diode, improperly diverts the obtained laser diode, and directly looks at the laser light emitted from the laser diode. As a specific example, there is a report example that a dangerous object that takes out a laser diode from a commercially available projector and emits a high-power light beam has been produced. However, even in such a situation, no effective countermeasure is currently taken.

  As a countermeasure against such a problem, for example, a mechanical password is provided in the optical path before the laser beam from the laser diode is emitted from the apparatus, and the laser beam is not emitted unless the key is set to the correct password. A technique for doing so has been proposed (see, for example, Patent Document 1).

  However, in this technique, when only the laser diode portion is taken out from the apparatus, it does not have any suppressing effect on the production of the dangerous material by the above-mentioned unauthorized diversion.

  The present invention has been made in view of the above, and includes a laser diode module that can be easily prevented from being diverted, a laser diode device including the laser diode module, and the laser diode module or the laser diode device. It is an object to provide an image projection apparatus provided.

  This laser diode module requires that the laser diode and the current control means for controlling the current flowing through the laser diode are integrated as one module.

  According to the disclosed technology, a laser diode module that can be easily prevented from being diverted, a laser diode device that includes the laser diode module, and an image projection device that includes the laser diode module or the laser diode device are provided. it can.

1 is a schematic diagram (part 1) illustrating a laser diode module according to a first embodiment; FIG. 6 is a schematic diagram (part 2) illustrating the laser diode module according to the first embodiment; 1 is a block diagram illustrating a circuit configuration of a laser diode module according to a first embodiment. 1 is a schematic view illustrating a laser diode device according to a first embodiment. 1 is a block diagram illustrating a circuit configuration of a laser diode device according to a first embodiment. It is a flowchart which illustrates operation | movement of the determination means in the laser diode apparatus which concerns on 1st Embodiment. It is a flowchart which illustrates operation | movement of the control signal production | generation means in the laser diode apparatus which concerns on 1st Embodiment. It is a schematic diagram which illustrates the laser diode apparatus which concerns on 2nd Embodiment. It is a block diagram which illustrates the circuit structure of the transmission / reception module by the side of a laser diode module. It is a flowchart which illustrates operation | movement of the transmission control signal production | generation means in the laser diode apparatus which concerns on 2nd Embodiment. It is a block diagram which illustrates the circuit structure of the transmission / reception module by the side of a control signal production | generation means. FIG. 6 is a schematic diagram (part 1) illustrating an image projection apparatus according to a third embodiment. FIG. 6 is a schematic diagram (part 2) illustrating an image projection apparatus according to a third embodiment.

  Hereinafter, embodiments for carrying out the invention will be described with reference to the drawings. In the drawings, the same components are denoted by the same reference numerals, and redundant description may be omitted.

<First Embodiment>
[Laser diode module]
First, the laser diode module according to the first embodiment will be described. FIG. 1 is a schematic diagram (part 1) illustrating the laser diode module according to the first embodiment. 1A is a bottom view (viewed from the mounting surface side of the substrate), FIG. 1B is a transparent side view, and FIG. 1C is a plan view (viewed from the laser light emitting side). Hereinafter, the laser diode may be referred to as LD.

Referring to FIG. 1, LD module 10 includes a CAN stem 11, and column 12, the LD 13 (LD devices), a submount 14, a circuit section 15, a terminal unit ₁₆ 1 to 16 _8, the cap 17 And an exit window 18. The inside of the LD module 10 is hermetically sealed with, for example, an inert gas.

  In the LD module 10, a laser mounting column 12 made of metal or the like is installed on one side of a CAN stem 11 made of metal or the like. For example, a horizontal resonator end surface light emitting type LD 13 is mounted on the support 12 via a submount 14. On one side of the CAN stem 11, a circuit unit 15 having a determination unit 15a, a drive unit 15b, and a switch 15c, which will be described later, is mounted.

Furthermore, the CAN stem 11 is provided with terminal portions 16 _{1 to} 16 ₈ made of metal or the like. One end of the terminal portion 16 ₁ to 16 ₈ are electrically connected by the respective elements and the wire bonding of LD13 or circuit portion 15, the other end protrudes to the other side of the CAN stem 11. The CAN stem 11 is provided with a cap 17 made of metal or the like so as to cover the support column 12, the LD 13, the submount 14, and the circuit unit 15. The cap 17 is provided with an emission window 18 made of glass or the like, and the laser light emitted from the LD 13 travels outside the LD module 10 through the emission window 18.

  A light receiving element such as a photodiode is housed in the CAN stem 11 together with the LD 13, a part of the light emitted from the LD 13 is received by the light receiving element, and the amount of light emitted from the LD 13 is controlled based on the output signal from the light receiving element. It is good also as a possible structure.

  FIG. 2 is a schematic diagram (part 2) illustrating the laser diode module according to the first embodiment, and schematically shows a state in which the inside is seen through from the upper surface of the LD module 10. Referring to FIG. 2, the circuit unit 15 includes a determination unit 15a, a driving unit 15b, and a switch 15c, and has a function of controlling the current flowing through the LD 13. The circuit unit 15 is a typical example of current control means according to the present invention.

FIG. 3 is a block diagram illustrating a circuit configuration of the laser diode module according to the first embodiment. In FIG. 3, Anode is a current input to the LD 13, for example, it is assigned to the terminal unit 16 _8. Catode is a current output of the LD 13, for example, it is assigned to the terminal unit 16 _1.

Data is a control signal (hereinafter referred to as control signal Data), and Clk is a synchronization signal thereof (hereinafter referred to as synchronization signal Clk). The control signal Data can be a signal conforming to a serial transmission standard such as I ² C, for example, but the transmission form is not limited to this. Synchronizing signal Clk and the control signal Data, for example, each assigned to the terminal unit 16 ₅ and 16 _6, and is capable input and output determination means 15a.

Vdd is a power supply voltage supplied to the determining means 15a, for example, it is assigned to the terminal unit 16 _7. Vs is the source voltage supplied to the driving means 15b, for example, is assigned to the terminal unit 16 _2. GND is a reference potential for Vdd and Vs, and is assigned to the terminal portions 16 ₃ and 16 ₄ , for example. The GND assigned to the terminal portions 16 ₃ and 16 ₄ may be connected to each other in the circuit portion 15.

  The determination unit 15a has a function of determining whether to turn on the switch 15c based on the input control signal Data. The determination unit 15a compares the input control signal Data with the data stored therein, and determines whether to turn on the switch 15c based on the comparison result. Based on the determination result, the determination unit 15a outputs a signal that instructs the drive unit 15b to turn on the switch 15c.

Specifically, for example, determination unit 15a is a signals S ₁ switch 15c is ON (conducting) state when the control signal Data entered is only to match the data stored therein to the drive means 15b Output (for example, set the value of the signal S ₁ to “1”). If they do not match the inverse outputs the signals S ₁ switch 15c is kept OFF state (disconnected state) to the drive means 15b (for example, keep the value of the signals S ₁ remains "0").

  The determination unit 15a can be configured to include a CPU (Central Processing Unit) and a memory such as a RAM (volatile memory) and a ROM (nonvolatile memory). Various functions of the determination unit 15a can be realized by reading a program recorded in a ROM or the like into the main memory and executing it by the CPU. However, part or all of the determination means 15a may be realized only by hardware. Further, the determination unit 15a may be physically configured by a plurality of devices.

The driving unit 15b has a function of driving the switch 15c. Driving means 15b has the signal _{S 1} output from the decision unit 15a, (converts the example voltage values) into the switch 15c drivable signal _{S 2,} and outputs to the switch 15c. As the driving unit 15b, for example, a level shift circuit, a current amplifier circuit, or the like can be used. However, when the determination unit 15a can directly drive the switch 15c, signal conversion is unnecessary, and thus the driving unit 15b may not be provided.

The switch 15c has a function of turning ON / OFF the current flowing through the LD 13 based on the determination result of the determination unit 15a. Switch 15c, for example, the signal _{S 2} is electric current to LD13 and ON becomes a high voltage, contrary to the signal _{S 2} is operated so as to cut off the current flowing to the LD13 and OFF becomes a low voltage. The switch 15c is OFF (blocked) in the initial state. For example, an analog switch or the like can be used as the switch 15c.

  In this embodiment, the LD 13 and the circuit unit 15 are integrated into one module by packaging them into one CAN, but the present invention is not limited to this form. As another example, the LD 13 and the circuit unit 15 may be molded as a single module by molding the resin 13 and the like like a hybrid IC, or a method such as a semiconductor process on the same substrate. It may be integrated as one module by making an IC.

[Laser diode device]
Next, the laser diode device according to the first embodiment will be described. FIG. 4 is a schematic view illustrating the laser diode device according to the first embodiment. FIG. 5 is a block diagram illustrating a circuit configuration of the laser diode device according to the first embodiment. However, in FIG. 5, Vdd, Vs, and GND shown in FIG. 3 are omitted.

  4 and 5, the LD apparatus 20 includes an LD module 10, a substrate 21, a control signal generation unit 22, a connector 23, a transmission cable 24, a system control signal generation unit 25, and a transmission cable. 26 and a housing 29.

The LD module 10 is mounted on the substrate 21 fixed to the housing 29 by soldering or the like (not shown). The control signal generation means 22 has a function of generating and outputting the control signal Data and the synchronization signal Clk. The control signal generation means 22 is connected to the terminal portions 16 ₅ (Clk) and 16 ₆ (Data) of the LD module 10 via a connector 23, a transmission cable 24, and a wiring pattern (not shown) formed on the substrate 21. Electrically connected. That is, the control signal generation unit 22 is electrically connected to the determination unit 15a.

  The control signal generation means 22 can be configured to have a CPU (Central Processing Unit) and a memory such as a RAM (volatile memory) and a ROM (nonvolatile memory). Various functions of the control signal generation means 22 can be realized by reading a program recorded in a ROM or the like into the main memory and executing it by the CPU. However, a part or all of the control signal generation means 22 may be realized only by hardware. Further, the control signal generation means 22 may be physically constituted by a plurality of devices.

  The connector 23 has a connector 23a provided on the control signal generating means 22 side and a connector 23b provided on the housing 29 side, and both are electrically connected in a detachable state by fitting. The If necessary, power can be supplied from the substrate 21 to the control signal generating means 22 via the connector 23 and the transmission cable 24. In addition, the board | substrate 21, the transmission cable 24, and the connector 23 are typical examples of the relay transmission means based on this invention. The connector 23 is a typical example of connection separating means according to the present invention.

The system control signal generation unit 25 has a function of controlling the supply of current to the LD module 10. The system control signal generation means 25 is electrically connected to the terminal portions 16 ₈ (Anode) and 16 ₁ (Cathode) of the LD module 10 through a transmission cable 26 and a wiring pattern (not shown) formed on the substrate 21. It is connected.

  FIG. 6 is a flowchart illustrating the operation of the determination unit in the laser diode device according to the first embodiment. Referring to FIG. 6, first, in step S <b> 100, the determination unit 15 a detects “Bus_Free”. When “Bus_Free” is not detected (in the case of No), the process of step S100 is repeated. 6 and 7, “Bus_Free” means a state in which no signal flows on the signal line of the control signal Data.

  When “Bus_Free” is detected in step S100 (in the case of Yes), in step S110, the determination unit 15a transmits a “Request” command requesting the control signal generation unit 22 to transmit the control signal Data. To do. When the transmission of the “Request” command is completed in step S110, in step S120, the determination unit 15a activates a timer “Timer_1” provided therein and starts measuring the predetermined time T1.

  Next, in step S130, the determination unit 15a determines whether or not the predetermined time T1 has elapsed. If the predetermined time T1 has not elapsed in step S130 (in the case of No), in step S140, the determination unit 15a determines whether or not the control signal Data has been input. When the control signal Data is input in Step S140 (in the case of Yes), in Step S150, the determination unit 15a compares the input control signal Data with the data stored therein, and if they match, For example, a signal for commanding ON of the switch 15c is output to the driving means 15b. When the control signal Data is not input in step S140 (in the case of No), the process proceeds to step S130.

  When the predetermined time T1 has passed in Step S130 (in the case of Yes) and in the case where the data does not match in Step S150 (in the case of No), in Step 160, the determination unit 15a resets “Timer_1”. The operations in steps S100 to S150 are repeated.

  As described above, when the control signal Data is input before the predetermined time T1 elapses, the determination unit 15a compares the input control signal Data with the data stored therein, and drives if it matches. A signal for commanding ON of the switch 15c is outputted to the means 15b. If the control signal Data is not received even after the predetermined time T1 has elapsed, or if the control signal Data does not match the stored data, “Timer_1” is reset and steps S100 to S150 are performed. Repeat the operation.

  FIG. 7 is a flowchart illustrating the operation of the control signal generating unit in the laser diode device according to the first embodiment. Referring to FIG. 7, first, in step S200, the control signal generation unit 22 detects “Bus_Free”. When “Bus_Free” is not detected (in the case of No), the process of step S200 is repeated.

  When “Bus_Free” is detected in step S200 (in the case of Yes), in step S210, the control signal generation unit 22 determines whether or not the “Request” command is received from the determination unit 15a. When the “Request” command is received in Step S210 (in the case of Yes), in Step S220, the control signal generation unit 22 generates the control signal Data and transmits it to the determination unit 15a. If the “Request” command is not received in step S210 (No), the process proceeds to step S200.

  As described above, when the “Request” command is received after the state of “Bus_Free”, the control signal generation unit 22 generates the control signal Data and transmits it to the determination unit 15a. That is, the control signal Data has the same function as the encryption key. When the control signal generation unit 22 receives the “Request” command from the determination unit 15 a, the control signal Data is output, and the determination unit 15 a is output from the control signal generation unit 22. And a function of controlling ON / OFF of the current flowing through the LD 13 based on the control signal Data.

  As described above, according to the first embodiment, the LD 13 and the circuit unit 15 (the determination unit 15a, the driving unit 15b, and the switch 15c) that are current control units that control the current flowing through the LD 13 are combined with the LD module. It was integrated as 10 and made inseparable. Thereby, since the LD 13 cannot easily emit light, it is possible to prevent unauthorized use of the LD module 10.

  The LD device 20 is connected to the LD module 10 by connecting to the control signal generating means 22 for generating and outputting the control signal Data necessary for causing the LD module 10 to emit light. As a result, even if the LD module 10 is illegally taken out from the LD device 20, the LD module 10 cannot emit light alone unless the control signal Data generated by the control signal generation means 22 is input. Can be prevented.

  If the control signal generating means 22 is provided in the LD module 10 in a non-detachable state, the control signal generating means 22 and the LD module 10 may be taken out together and diverted together. In the LD apparatus 20, since the LD module 10 and the control signal generating means 22 can be managed separately by providing the LD module 10 with the control signal generating means 22 in a detachable state, the LD module 10 is illegally managed. It is possible to prevent the diversion more reliably.

<Second Embodiment>
In the second embodiment, an example is shown in which communication between the control signal generating means and the laser diode module can be performed wirelessly. In the second embodiment, the description of the same components as those of the already described embodiments is omitted.

  FIG. 8 is a schematic view illustrating a laser diode device according to the second embodiment. Referring to FIG. 8, the LD device 30 is different in that the connector 23 (connectors 23a and 23b) is replaced with a substrate 31, a connector 32, and a wireless transmission / reception unit 33 (transmission / reception modules 33a and 33b). 4).

  The control signal generation unit 22 includes a transmission / reception module 33 a of the wireless transmission / reception unit 33. The substrate 31 is fixed to the housing 29, and the connector 32 and the transmission / reception module 33 b of the wireless transmission / reception unit 33 are mounted on the substrate 31. The connector 32 and the transmission / reception module 33b are electrically connected via a wiring pattern (not shown) formed on the substrate 31.

The connector 32 is a connector for connecting the substrate 31 to the transmission cable 24. The control signal generation unit 22 is connected to the wireless transmission / reception unit 33, a wiring pattern (not shown) formed on the substrate 31, the connector 32, the transmission cable 24, and a wiring pattern (not shown) formed on the substrate 21. The terminal portions 16 ₅ (Clk) and 16 ₆ (Data) of the LD module 10 are connected in a state where signals can be exchanged. That is, the control signal generation unit 22 is electrically connected to the determination unit 15a. In addition, the board | substrate 21, the transmission cable 24, the board | substrate 31, the connector 32, and the radio | wireless transmission / reception part 33 (transmission / reception module 33a and 33b) are typical examples of the relay transmission means based on this invention.

  FIG. 9 is a block diagram illustrating a circuit configuration of a transmission / reception module on the LD module side. Referring to FIG. 9, the transmission / reception module 33 b includes a first block 40 and a second block 50. The first block 40 has a function of transmitting and receiving the control signal Data in a wireless manner, and the second block 50 has a function of transmitting and receiving the synchronization signal Clk in a wireless manner. The first block 40 and the second block 50 can have the same configuration.

  The first block 40 includes a transceiver 41, a light emitting diode 42, a photodetector 43, a receiver 44, and a transmission control signal generation unit 45. The second block 50 includes a transceiver 51, a light emitting diode 52, a photodetector 53, a receiver 54, and a transmission control signal generation unit 55. Since the operation of the second block 50 is the same as the operation of the first block 40, the description thereof is omitted, and only the operation of the first block 40 will be described below.

  In the first block 40, the transceiver 41 converts the input signal into a current signal TD for driving the light emitting diode 42 when the signal ENTD output from the transmission control signal generating means 45 is “1”, for example. As a result, an optical signal is transmitted from the light emitting diode 42 toward the control signal generating means 22. When the signal ENTD output from the transmission control signal generating means 45 is “0”, the current signal TD remains constant at a predetermined value regardless of the presence or absence of the input signal. The optical signal transmitted to the control signal generation unit 22 corresponds to the “Request” command described in step S110 of FIG.

  On the other hand, the photodetector 43 converts the received optical signal into a current signal. The receiver 44 converts the current signal into a reception signal RD having a predetermined signal level and outputs it to the transmission control signal generation means 45. Further, the reception signal RD is output from the transmission control signal generation means 45 to the determination means 15a. The reception signal RD output to the determination unit 15a corresponds to the control signal Data. A part of the first block 40 is a typical example of the receiving means according to the present invention.

  Here, the operation of the transmission control signal generating means will be described with reference to FIG. FIG. 10 is a flowchart illustrating the operation of the transmission control signal generating means in the laser diode device according to the second embodiment. Referring to FIG. 10, first, in step S300, the transmission control signal generation unit 45 detects “Bus_Free”. When “Bus_Free” is not detected (in the case of No), the process of step S300 is repeated. In FIG. 10, “Bus_Free” means a state in which no signal flows on the signal line of the control signal Data and the signal line of the reception signal RD.

  When “Bus_Free” is detected in step S300 (in the case of Yes), in step S310, the transmission control signal generation unit 45 sets the signal ENDD to “1” so that the input signal to the transceiver 41 can be transmitted. To do. Next, the transmission control signal generation unit 45 detects reception of the reception signal RD in step S320. When reception of the reception signal RD is detected in step S320 (in the case of Yes), in step S330, the transmission control signal generation unit 45 sets the signal ENDD to “0” and the reception signal RD passes through the transceiver 41. Thus, the return to the control signal generating means 22 side is prevented.

  FIG. 11 is a block diagram illustrating a circuit configuration of a transmission / reception module on the control signal generation means side. Referring to FIG. 11, the control signal generation unit 22 includes a transmission / reception module 33 a of the wireless transmission / reception unit 33 and a control element 60. The transmission / reception module 33 a includes a transceiver 41, a light emitting diode 42, a photodetector 43, a receiver 44, a transceiver 51, a light emitting diode 52, a photodetector 53, and a receiver 54.

  The transceiver 41 converts an input signal from the control element 60 into a current signal TD that drives the light emitting diode 42. As a result, an optical signal is transmitted from the light emitting diode 42 toward the determination means 15a. Note that the optical signal transmitted toward the determination unit 15a corresponds to the control signal Data.

  On the other hand, the photodetector 43 converts the received optical signal into a current signal. The receiver 44 converts the current signal into a reception signal RD having a predetermined signal level and outputs it to the control element 60. The reception signal RD output to the control element 60 corresponds to the “Request” command described in step S110 of FIG.

  The control element 60 receives the above-described “Request” command, and generates and outputs the control signal Data and the synchronization signal Clk, and the transmission control signal generation means 45 shown in FIG. 10 in a single component. Designed control element. With such a configuration, the output of the control signal Data and the synchronization signal Clk can be controlled inside the control element 60 depending on the presence or absence of the reception signals RD and RC, so that control signals such as the signals ENTD and ENTC are not necessary. A part of the transmission / reception module 33a is a typical example of the transmission means according to the present invention.

  In the above description, the case where the wireless transmission / reception unit 33 (transmission / reception modules 33a and 33b) adopts a wireless wireless method has been described as an example. However, the wireless transmission / reception unit 33 (transmission / reception modules 33a and 33b) A wireless system may be adopted.

  As described above, according to the second embodiment, the same effects as those of the first embodiment are obtained, but the following effects are further obtained. That is, since the control signal generation means 22 and the LD module 10 can be communicated in a wireless manner so that the control signal generation means 22 and the LD module 10 can be used completely separated, the LD module 10 is illegal. It is possible to more reliably prevent the diversion.

<Third Embodiment>
In the third embodiment, an image projection apparatus equipped with the LD device 20 according to the first embodiment is illustrated. In the third embodiment, the description of the same components as those of the already described embodiments is omitted.

  FIG. 12 is a schematic diagram (part 1) illustrating an image projection apparatus according to the third embodiment. FIG. 12 schematically shows a state in which the image projection device 70 is viewed from a direction perpendicular to a plane including an optical path where the emitted light from the LD module 10 reaches the projection lens group 81 via the display element 80. . FIG. 13 is a schematic diagram (part 2) illustrating the image projection apparatus according to the third embodiment. FIG. 13 schematically shows a state in which the image projection device 70 is viewed from a horizontal direction with respect to a plane including a light path from the LD module 10 to the projection lens group 81 via the display element 80. .

  Referring to FIGS. 12 and 13, the image projection apparatus 70 irradiates the display element 80 that forms an image according to the modulation signal with illumination light from the LD 13 included in the LD module 10, and forms the display element 80. This is an image projection apparatus that projects an enlarged image onto the projection surface.

  When the switch 15c is turned on based on the control signal Data, the LD module 10 can emit light from the LD 13, and irradiates the phosphor layer 72 formed on the fluorescent wheel, which will be described later, with illumination light to generate a predetermined color light. The excitation light for emitting the light is output. As the excitation light, for example, blue light having a wavelength of 450 nm or its surroundings can be used.

  The fluorescent wheel 71 includes a circular transparent base material 73 having a phosphor layer 72 and a motor 74. The motor 74 is electrically connected to the system control signal generation means 25 via the transmission cable 85 and is rotationally controlled by the system control signal generation means 25. The transparent substrate 73 has a plurality of fan-shaped segment areas, and the phosphor layer 72 is formed in at least two of the segment areas.

  Each phosphor layer 72 receives the excitation light and emits predetermined wavelength band light (for example, red and green light) different from each other. Further, the phosphor layer is not formed in the other at least one segment region, and the excitation light is transmitted as it is. Note that a diffusion layer 75 is formed in this segment region, and the blue light emitted from the fluorescent wheel 71 is made uniform with other light.

  By rotating the fluorescent wheel 72 and causing the excitation light from the LD module 10 to blink in synchronization with the boundaries of the segment areas, red, green, and blue color lights can be sequentially emitted from the fluorescent wheel 71. In order to increase the amount of monochromatic light emitted from one phosphor layer 72 and improve the utilization efficiency of effective light, an incident mask having an opening formed corresponding to the shape of a light guide device 76 described later. 77 is disposed between the LD module 10 and the fluorescent wheel 71. The light emitted from the fluorescent wheel 71 is incident on the light guide device 76 to be converted into a light beam having a uniform intensity distribution, and then condensed by the condensing lens group 78 and is displayed at a predetermined angle by the reflecting mirror 79. Is irradiated.

  The display element 80 is electrically connected to the system control signal generation unit 25 via the transmission cable 86. The system control signal generation unit 25 forms an image corresponding to the color irradiated on the display element 80 on the display element 80, and modulates the irradiation light. The modulated light is incident on the projection lens group 81 and enlarged and projected onto a projection surface (a projection screen (not shown) or the like) to display a desired image.

  When the LD device 30 is mounted on the image projection device 70, the control signal generating means 22 on which the transmission / reception module 33a is mounted is built in the remote controller, and the transmission / reception module 33b is mounted on the LD module 10 or the like. It is good also as a structure incorporated in a main body. As a result, as shown in the second embodiment, the control signal generating means 22 and the LD module 10 can communicate with each other in a wireless manner, and the LD module 10 can emit light by a remote control operation. Here, the main body refers to a portion of the image projection apparatus 70 excluding the remote controller.

  As described above, according to the third embodiment, the LD device 20 according to the first embodiment or the LD device 30 according to the second embodiment is mounted on an image projection device such as a projector. Therefore, it is possible to realize an image projection apparatus that eliminates the possibility that the LD module 10 is illegally diverted.

  In addition, by using the LD 13 included in the LD module 10 of the LD device 20 or 30 as a light source of an image projection device such as a projector, it is possible to realize an image projection device with high brightness, long life, and high convenience.

  Further, the control signal generation means 22 in which the transmission / reception module 33a is mounted is mounted in the remote controller, and the control signal generation means 22 and the LD module 10 can communicate with each other in a wireless manner, which is convenient for the user. A good image projection apparatus can be realized.

  The preferred embodiment has been described in detail above. However, the present invention is not limited to the above-described embodiment, and various modifications and replacements are made to the above-described embodiment without departing from the scope described in the claims. Can be added.

10 LD module 11 CAN stem 12 Prop 13 LD
14 Submount 15 Circuit unit 15a Determination unit 15b Driving unit 15c Switch 16 _{1 to} 16 ₈ Terminal unit 17 Cap 18 Ejection window 20, 30 LD device 21, 31 Substrate 22 Control signal generation unit 23, 23a, 23b, 32 Connector 24, 26, 85, 86 Transmission cable 25 System control signal generation means 29 Case 33 Wireless transmission / reception unit 33a, 33b Transmission / reception module 40 First block 41, 51 Transceiver 42, 52 Light emitting diode 43, 53 Photo detector 44, 54 Receiver 45, 55 Transmission Control signal generating means 50 Second block 60 Control element 70 Image projection device 71 Fluorescent wheel 72 Phosphor layer 73 Transparent substrate 74 Motor 75 Diffusion layer 76 Light guide device 77 Incident mask 78 Condensing lens group 79 Reflecting mirror 80 Display element Child 81 Projection lens group

Japanese Patent Laid-Open No. 2004-070246

Claims (9)

A laser diode;
The laser diode module which integrated the current control means which controls the electric current which flows into the said laser diode as one module. The current control means includes a switch for turning on / off a current flowing through the laser diode;
Determination means for determining whether or not to turn on the switch based on the input control signal,
The laser diode module according to claim 1, wherein the switch is turned on / off based on a determination result of the determination unit. A driving means for driving the switch;
The determination means outputs a signal for instructing the driving means to turn on the switch based on the determination result,
The laser diode module according to claim 2, wherein the driving unit converts the signal into a signal capable of driving the switch and outputs the signal to the switch.   4. The laser diode module according to claim 2, wherein the determination unit compares the input control signal with data stored therein and determines whether to turn on the switch based on a comparison result. 5. . The laser diode module according to any one of claims 1 to 4, and
And a control signal generating means for generating and outputting a control signal for controlling the current control means. A laser diode module according to any one of claims 2 to 4, and
Control signal generating means for generating and outputting the control signal;
Relay transmission means interposed between the control signal generation means and the determination means, and relaying the control signal generated and output by the control signal generation means to the determination means,
The relay transmission means is a laser diode device comprising: transmission means for transmitting the control signal by a wireless method; and reception means for receiving the control signal transmitted by the wireless method. A laser diode module according to any one of claims 2 to 4, and
Control signal generating means for generating and outputting the control signal;
Relay transmission means interposed between the control signal generation means and the determination means, and relaying the control signal generated and output by the control signal generation means to the determination means,
The said relay transmission means is a laser diode apparatus provided with the connection isolation | separation means which makes the said control sign production | generation means removable. An image projection apparatus that irradiates a display element that forms an image according to a modulation signal with illumination light from a light source, and enlarges and projects the image formed on the display element onto a projection surface,
A laser diode module according to any one of claims 1 to 4 or a laser diode device according to any one of claims 5 to 7 is mounted, and the laser diode included in any of the above is mounted. Used for the light source,
An image projection apparatus characterized in that light emission from the laser diode is enabled based on a control signal input to the current control means. An image projection apparatus that irradiates a display element that forms an image according to a modulation signal with illumination light from a light source, and enlarges and projects the image formed on the display element onto a projection surface,
The laser diode device according to claim 6 is mounted, and the laser diode included in the laser diode device is used as the light source.
Comprising a remote controller for wirelessly controlling the main body including the light source,
The control signal generating means is built in the remote controller,
An image projection apparatus characterized in that light emission from the laser diode is enabled based on a control signal input to the current control means.

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