TW202005213A - Automatic power control light spot transmitter including a housing, a collimator, and a Diffractive Optical Elements - Google Patents

Abstract

This invention relates to an automatic power control light spot transmitter, including a housing, which sequentially has an accommodation space and a platform positioned above the accommodation space, and is covered on a substrate, so that an automatic power control IC, a laser diode and an optical reflection device are located within the housing, the accommodation space and the platform are positioned above the automatic power control IC, the laser diode and the optical reflection device; a collimator, which is fixed within the accommodation space of the housing; and a Diffractive Optical Elements (DOE), which is adhered to the platform of the housing. Accordingly, the laser diode projects a laser light on the optical reflection device, so that the optical reflection device projects the laser light vertically out of the collimator to the Diffractive Optical Elements (DOE). As a result, the Diffractive Optical Elements (DOE) generates a plurality of light spots, the laser light generates stray light within the housing by means of reflection, the stray light is detected by a photodiode of the automatic power control IC to form a readable photodetection signal. The photodetection signal performs feedback control on the output of the laser diode to adjust the ratio of a power emitted from the laser light, and the emission of each light spot of the Diffractive Optical Elements (DOE) is controlled based on the ratio of the power emitted from the laser light.

Description

Automatic power control light point transmitter

The invention relates to an automatic power control light point emitter whose light detection signal feedback controls the output of the laser diode to adjust the power ratio emitted by the laser light, and controls the winding power according to the power ratio emitted by the laser light The light spots of the optical components are emitted.

Press, the luminous intensity of the laser diode is also affected by the amount of drive current and temperature. When the drive current is higher, the light intensity is higher, the higher the component temperature and the greater the light attenuation value, and after the laser diode is started, and A slight voltage change will cause a dramatic change in the amount of current change, and automatic power control of the luminous intensity of the laser diode is also required. As shown in FIG. 1, which is disclosed in US Patent No. 7,177,333, it is a laser diode module 10 , Including: a heat sink (heat sink) 11, with a groove 111, and the back of the first pin 12a, the second pin 12b and the third pin (not shown); a fixed seat (mount )13, which is convexly arranged on the surface of the heat dissipation base 11 and is connected to the second pin 12b of the ground (GND); a primary mount (submount) 131 is provided inside the fixed base 13 for one laser A laser diode 14 is joined; a photodiode 15 is mounted on the heat sink 11; a metal cap 17 is provided with a glass window 171 on the top surface, and the bottom edge is joined Above the heat sink 11; an APC circuit 16, which is an automatic power control circuit designed as a circuit board or IC, and built-in package in the metal housing 17, using wire bonding with the first pin 12a, the The second pin 12b and the third pin are connected to the laser diode 14 and the photodetector 15 to form a voltage driving element of the laser diode, although the laser diode module 10 Reliability is high, but it is bulky and difficult to integrate into the application side, and it is impossible to use semiconductor surface adhesion technology (SMT) to achieve rapid automated production.

The second press, the current 3D sensing technology mainly uses structure light (structure light) technology, the existing sensing elements generally use a dot projector (dot projector), as shown in Figure 2, which is disclosed in US Patent No. 8,829,406, A light point emitter 20 includes: a radiation source element 21, including a laser diode 211 and a photodetector diode 212, the laser diode 211 outputs a laser light (L ₁ ) and the detector The photodiode 212 detects a reflected light (N ₁ ), the radiation source element 21 is mounted on a base 22, and the laser diode 211 is mounted on a primary mount 213, the secondary The fixing base 213 is fixed to a package tem 214, which is located in a tube shell 215, and a window 216 is provided on the upper side of the tube shell 215; a housing 23 is provided for accommodating the radiation source element 21 , And has an exit window 231; a collimating lens (collimating lens) 24, is housed in the housing 23; a diffractive optical elements (diffractive optical elements, DOEs) 25, is housed in the housing 23; A connector 26 is coupled to the radiation source element 21. The main operation mode of the light spot emitter 20 is that the laser light (L ₁ ) passes through the collimator lens 24 and passes through the diffractive optical element 25 to form a plurality of light spots projected on the object to be identified, and then passes through the camera (Camera) Capture images and identify 3D depth information, but it is bulky and complicated to assemble, and the radiation source element 21 cannot use semiconductor surface bonding technology to achieve rapid automated production.

However, the laser diode module 10 and the spot emitter 20 cannot use semiconductor surface bonding technology to achieve rapid automated production, and the laser diode module 10 needs to integrate the heat sink 11 and the first 1 pin 12a, 2nd pin 12b and 3rd pin, the fixed base 13, the secondary fixed base 131, the laser diode 14, the photodetector 15, the APC circuit 16 and the metal case 17. As a result of the larger volume, if the laser diode module 10 replaces the radiation source element 21 of the spot emitter 20, then the base 22, housing 23, collimating mirror 24 of the spot emitter 20 are integrated The diffractive optical element 25 and the connector 26 are not only more complicated to assemble, but also more bulky. Therefore, in view of the above-mentioned problems, the present inventor conceived an automatic power control light point transmitter, which is the subject to be solved by the present invention.

The reason is that the main purpose of the present invention is to provide an automatic power control light point emitter, which integrates an automatic power control IC with a light detecting diode, a fixed base, a laser diode, a light reflecting element, and a case on a substrate Covers, collimating mirrors and diffractive optical components are used to solve the problems of more complicated assembly, larger volume and the inability to use semiconductor surface adhesion technology to achieve rapid automated production in the prior art, and thus have simple assembly, light and thin volume and low production cost The effectiveness of the increase.

Another object of the present invention is to provide an automatic power control light point emitter, which can form a feedback control by using a laser diode, an automatic power control IC with a detection diode, and a light reflecting element Laser light, and in turn the ratio of the power emitted by the laser light, enhances the efficiency of controlling the emission of each spot of the diffractive optical element.

Still another object of the present invention is to provide an automatic power control light point transmitter, which has built-in optical feedback control and temperature compensation in the automatic power control IC to achieve stable laser light output, and built-in protection of the automatic power control IC Circuit to increase the reliability, thereby improving the stability of the light spot output and the improvement of the efficiency of the reliable output.

To achieve the above purpose, the technical means used in the present invention include: a substrate; an automatic power control IC, which has a light-detecting diode, and is fixed on the substrate; a fixing seat is fixed on the substrate; a thunder The laser diode is fixed on the fixing base and is coupled to the automatic power control IC; a light reflecting element is fixed in front of the laser diode; a shell cover has a capacity in sequence A housing space and a platform above the housing space and covering the substrate so that the automatic power control IC, the laser diode and the light reflecting element are located in the housing, and the housing space And the platform is located above the automatic power control IC, the laser diode and the light reflecting element; a collimating mirror is fixed in the accommodating space of the housing so that the collimating mirror is located The automatic power control IC, the laser diode, and the light reflecting element; and a diffractive optical element, which is adhered to the platform of the housing, so that the diffractive optical element is located on the collimating mirror Above; thereby, the laser diode system projects a laser light on the light reflecting element, so that the light reflecting element perpendicularly shoots the laser light system out of the collimator lens to the diffractive optical element, allowing the diffractive The optical element can generate a plurality of light spots, and the laser light generates a stray light through reflection in the housing, and the stray light is detected by the light detection diode system of the automatic power control IC to form a readable detection Optical signal, the detection signal is to feedback control the output of the laser diode to adjust the power ratio emitted by the laser light, and to control each of the diffractive optical elements according to the power ratio emitted by the laser light Point of light emission.

According to the aforementioned features, the automatic power control IC is provided with a supply voltage contact, a ground contact, a current setting contact, a photodiode output contact, and a laser diode output contact.

According to the aforementioned features, the circuit architecture of the automatic power control IC further includes that the supply voltage contact is coupled in series to the detection diode and is coupled in parallel to a resistor and a first ESD circuit, and the first ESD circuit is connected in parallel Coupling to a ground terminal; a logic circuit, respectively coupling the resistor and the current setting contact in series; a current amplifying circuit, coupling the detection diode in series; an error amplifier, coupling the current amplifier in parallel Circuit; a protection circuit, which is coupled in parallel to the error amplifier, and has a reference voltage unit, an over-temperature protection unit, and a low-voltage locking unit; a transistor, which is coupled in series to the error amplifier and the laser two, respectively A polar body output contact and the ground terminal; a current monitoring circuit, which is coupled in parallel to the ground terminal; a second ESD circuit, which is respectively coupled in parallel to the current setting contact and the ground terminal; and a third ESD circuit, It is respectively coupled to the current setting contact and the ground terminal in parallel; a variable resistor is respectively coupled to the output contact of the detection diode and the ground terminal in series; the laser diode system is respectively coupled to the supply in series The voltage contact and the output contact of the laser diode.

According to the aforementioned features, the circuit architecture of the automatic power control IC further includes a slow-start circuit to prevent overcurrent during startup.

According to the aforementioned feature, when the logic circuit determines that the current setting contact is set to a high level, the current value of the current monitoring circuit is set to 100 mA, or when the logic circuit determines that the current setting contact is set to a low At level, the current value of the current monitoring circuit is set to 300mA.

According to the aforementioned features, when the logic circuit determines that the current setting contact is set at a high level, the voltage value of the reference voltage unit is set to 0.55V, and when the logic circuit determines that the current setting contact is set at When the level is low, the voltage value of the reference voltage unit is set to 1.1V; the temperature value of the over-temperature protection unit is set to be greater than 165 degrees and less than 135 degrees; the voltage value of the low voltage lock unit is set to less than 2.3 V and greater than 2.5V.

According to the aforementioned features, the resistance value range of the variable resistor is set at 35Kohm to 1Kohm, the resistance value of the variable resistor is set at 6Kohm, and the current value corresponding to the photodiode is set at 90uA.

According to the aforementioned features, the human body model values of the first ESD circuit, the second ESD circuit and the third ESD circuit are set to be greater than or equal to 2KV; the first ESD circuit, the second ESD circuit and the third ESD circuit The mechanical model value of the circuit is set to be greater than or equal to 200V.

According to the aforementioned feature, the substrate has a first surface and a second surface on the opposite side, the first surface is provided with a first conductive pad and the second surface is provided with a second conductive pad, and the substrate is formed by The circuit board is formed so that internal wires are formed in the substrate, so that the first conductive pad and the second conductive pad are coupled to each other, and the first conductive pad is respectively coupled to the automatic power control IC and the thunder by a plurality of external wires The emitter diode chip and the second conductive pad are coupled to an external circuit.

According to the aforementioned features, the collimator lens is composed of a single lens or a microlens array.

According to the aforementioned features, the material of the cover includes any one selected from copper, stainless steel or aluminum.

According to the aforementioned feature, a metal frame is provided on the first surface of the substrate, the metal frame surrounds the automatic power control IC, the fixing base and the light reflecting element, and an adhesive is provided on the metal frame Layer, the adhesive layer adheres and fixes the bottom surface of the shell.

According to the aforementioned features, the material of the metal frame includes any one selected from nickel gold and nickel palladium gold.

According to the aforementioned features, the material of the adhesive layer includes any one selected from the group consisting of adhesive materials and metals.

According to the aforementioned features, the adhesive material is composed of silicone rubber or epoxy resin.

According to the aforementioned features, the metal system includes any one selected from the group consisting of gold tin, silver copper, tin silver copper, and indium.

According to the aforementioned features, the accommodating space of the cover further includes a pressure ring structure, the pressure ring structure having a ring recess and a pressure ring located in the ring recess, the ring recess outside the ring surface It is riveted and fixed into the accommodating space of the shell, the ring recess is used to receive the collimator lens and the ring recess is provided with a light reflection hole, and the position of the central convex surface of the collimator lens, the The position of the light reflecting hole and the position of the light reflecting element correspond vertically, and the inner annular surface of the pressing ring sets the central convex surface of the collimating lens and the bottom annular surface of the pressing ring presses the collimating lens Ring plane.

According to the pre-release feature, the platform is located in the casing, so that the platform forms an embedded groove.

By means of the above-mentioned technical means, it integrates the substrate with an automatic power control IC having the light-detecting diode, the fixing base, the laser diode, the light reflecting element, the cover, the collimating mirror and the winding The laser optical element, the laser diode, the automatic power control IC with the photodetector and the light reflecting element can form the laser light that can be feedback controlled, and then the automatic power control IC is built in Optical feedback control and temperature compensation to stabilize the output of the laser light, and the automatic power control IC is built in the protection circuit, and then has the advantages of simple assembly, light and thin, low production cost, and the ratio of the power emitted by the laser light The effect of controlling the emission of each light spot of the diffractive optical element, and the stable and reliable output of the light spot is improved.

First, please refer to FIGS. 3A~3C and FIGS. 5~7, a preferred embodiment of an automatic power control spot emitter 30A of the present invention includes: a substrate 31, in this embodiment, the substrate 31 has a first A surface 311 and a second surface 312 on the opposite side, the first surface 311 is provided with a first conductive pad 3111 and the second surface 312 is provided with a second conductive pad 3121, and the substrate 31 is formed by a circuit board In the structure, internal wires are formed in the substrate 31, so that the first conductive pad 3111 and the second conductive pad 3121 are coupled to each other. The second conductive pad 3121 is coupled to an external circuit O, but it is not limited thereto.

An automatic power control IC32, which has a light detecting diode 321, is coupled to the automatic power control IC32 by the first conductive pad 3111, and is fixed on the substrate 31. In this embodiment, the automatic power control IC32 is Equipped with a supply voltage contact (P ₁ ), a ground contact (P ₂ ), a current setting contact (P ₃ ), a photodiode output contact (P ₄ ) and a laser diode output Contact (P ₅ ), but not limited to this.

A fixing base 33 is fixed on the substrate 31.

A laser diode 34 is fixed on the fixing base 33 and is coupled to the automatic power control IC 32. In this embodiment, the first conductive pad 3111 is respectively coupled to the automatic power by a plurality of external wires W The control IC 32 and the laser diode chip 34 are not limited thereto.

A light reflecting element 35 is fixed in front of the laser diode 34.

A housing 36 with an accommodating space 361 and a platform 362 above the accommodating space 361 in sequence, and covering the substrate 31 to make the automatic power control IC 32 and the laser diode 34 And the light reflecting element 35 is located in the housing 36, and the accommodating space 361 and the platform 362 are located above the automatic power control IC 32, the laser diode 34 and the light reflecting element 35, this implementation For example, the material of the cover 36 includes any one selected from copper, stainless steel, and aluminum, but it is not limited thereto.

Above, the first surface 311 of the substrate 31 is provided with a metal outer frame 3112, the metal outer frame 3112 encloses the automatic power control IC 32, the fixing base 33 and the light reflecting element 35, and the metal outer frame 3112 An adhesive layer 301 is provided on the top, and the adhesive layer 301 adheres and fixes the bottom surface 363 of the cover 36. In this embodiment, the material of the adhesive layer 301 includes any one selected from the group consisting of adhesive materials and metals. The material system includes any one selected from silicone or epoxy. The metal system includes gold tin (AuSn), silver copper (AgCu), tin silver copper (SnAgCu, SAC) or indium. (Indium) Any one of them, but not limited to this.

A collimating mirror 37 is fixed in the accommodating space 361 of the housing 36 so that the collimating mirror 37 is located above the automatic power control IC 32, the laser diode 34 and the light reflecting element 35 In this embodiment, the collimating mirror 37 is composed of a single lens or a microlens array, but it is not limited to this.

A diffractive optical element 38 is adhered to the platform 362 of the housing 36 so that the diffractive optical element 38 is located above the collimating mirror 37.

In another preferred embodiment, as shown in FIGS. 4A-4C and FIGS. 5-7, an automatic power control spot emitter 30B includes: the substrate 31, the automatic power control IC 32, the fixing base 33, the thunder The receiving diode 34, the light reflecting element 35, the housing 36, the collimating mirror 37, the diffractive optical element 38 and the housing space 361 of the housing 36 further include a pressure ring structure 39, the pressure The ring structure 39 has a ring recess 391 and a pressing ring 392 located in the ring recess 391. The outer ring surface 3911 of the ring recess 391 is riveted and fixed into the accommodating space 361 of the shell 36. The ring recess 391 receives the collimator lens 37 and the ring recess 391 is provided with a light reflecting hole 3912, and the position of the central convex surface 371 of the collimating lens 37, the position of the light reflecting hole 3912 and the The position of the light reflecting element 35 corresponds vertically, and the inner annular surface 3921 of the pressing ring 392 sets the central convex surface 371 of the collimating lens 37 and the bottom annular surface 3922 of the pressing ring 392 presses the collimating lens The ring plane 372 of 37 and the platform 362 are located in the housing 36, so that the platform 362 forms an embedded groove, but it is not limited thereto.

Based on such a configuration, the difference between the above two preferred embodiments is only that the height of the platform 362 is different from the presence of the pressure ring structure 39, and both can reach the laser diode 34 to project a mine The emitted light (L ₂ ) is on the light reflecting element 35, so that the light reflecting element 35 emits the laser light (L ₂ ) perpendicularly out of the collimating mirror 37 to the diffractive optical element 38, so that the diffractive optical element 38 can generate a plurality of light spots (C), and the laser light (L ₂ ) generates a stray light (N ₂ ) through reflection in the housing 36, and the photodetector diode 321 of the automatic power control IC 32 Detect the stray light (N ₂ ) to form a readable light detection signal (S). The light detection signal (S) is to feedback control the output of the laser diode 34 to adjust the laser light (L ₂ ) The ratio of the emitted power, and the emission of each light spot (C) of the diffractive optical element 38 is controlled by the ratio of the emitted power of the laser light (L ₂ ).

In addition, the circuit architecture of the automatic power control IC 32 further includes that the supply voltage contact (P ₁ ) is coupled in series to the photodetector diode 321 and is coupled in parallel to a resistor (R) and a first ESD circuit (E ₁ ) In addition, the first ESD circuit (E ₁ ) is coupled in parallel to a ground terminal (G). In this embodiment, the voltage supplied by the supply voltage contact (P ₁ ) is 2.8V, but it is not limited to this.

A logic circuit (LE) is coupled to the resistor (R) and the current setting contact (P ₃ ) in series.

A current amplifying circuit (CA) is coupled in series to the light detecting diode 321.

An error amplifier (EA) is coupled in parallel to the current amplification circuit (CA).

A protection circuit (U) is coupled in parallel to the error amplifier (EA), and has a reference voltage unit (U ₁ ), an over-temperature protection unit (U ₂ ) and a low voltage lock unit (U ₃ ). In an embodiment, when the logic circuit (LE) determines that the current setting contact (P ₃ ) is set at a high level, the voltage value of the reference voltage unit (U ₁ ) is set to 0.55V, and when the logic When the circuit (LE) judges that the current setting contact (P ₃ ) is set at a low level, the voltage value of the reference voltage unit (U ₁ ) is set to 1.1V; the temperature of the over-temperature protection unit (U ₂ ) The value is set to be greater than 165 degrees and less than 135 degrees; the voltage value of the low voltage locking unit (U ₃ ) is set to be less than 2.3V and greater than 2.5V, but it is not limited to this.

A transistor (T) is coupled in series to the error amplifier (EA), the laser diode output contact (P ₅ ) and the ground (G).

A current monitoring circuit (CM) is coupled in parallel to the ground terminal (G). In this embodiment, when the logic circuit (LE) determines that the current setting contact (P ₃ ) is set at a high level, then the The current value of the current monitoring circuit (CM) is set to 100 mA, or when the logic circuit (LE) determines that the current setting contact (P ₃ ) is set to a low level, the current value of the current monitoring circuit (CM) The system is set to 300mA, but it is not limited to this.

A second ESD circuit (E ₂ ) is respectively coupled in parallel to the current setting contact (P ₃ ) and the ground terminal (G).

A third ESD circuit (E ₃ ) is respectively coupled in parallel to the current setting contact (P ₃ ) and the ground terminal (G). In this embodiment, the first ESD circuit (E ₁ ) and the second The human body model (HBM) values of the ESD circuit (E ₂ ) and the third ESD circuit (E ₃ ) are set to be greater than or equal to 2KV; the first ESD circuit (E ₁ ) and the second ESD circuit (E ₂ ) and the mechanical model (MM) value of the third ESD circuit (E ₃ ) are set to be greater than or equal to 200V, but not limited to this.

A variable resistor (VR) is respectively connected in series to the output contact (P ₄ ) of the photodetector and the ground (G).

The laser diode 34 is respectively coupled in series to the supply voltage contact (P ₁ ) and the laser diode output contact (P ₅ ). In this embodiment, the resistance of the variable resistor (VR) The value range is set at 35Kohm to 1Kohm, the resistance value of the variable resistor (VR) is set at 6Kohm, and the current value corresponding to the photodetector diode 321 is set at 90uA, but it is not limited to this.

A slow start circuit (SS) is used to prevent overcurrent during start-up.

Based on such a configuration, the substrate 31 integrates the automatic power control IC 32 with the light detecting diode 321, the fixing base 33, the laser diode 34, the light reflecting element 35, the housing 36, and the standard The straight mirror 37 and the diffractive optical element 38, the laser diode 34, the automatic power control IC 32 with the photodetector diode 321, and the light reflecting element 35 can form the laser light that can be feedback controlled (L ₂ ), then the automatic power control IC32 is built-in optical feedback control and temperature compensation, so as to stabilize the output of the laser light (L ₂ ), and the automatic power control IC32 is built in the protection circuit (U) , Also has over current protection (over current protection), over temperature protection (over temperature protection) or transient protection (transient protection), and further has simple assembly, light and thin, low production cost, the laser light (L ₂ ) emitted The power ratio controls the emission of each light spot (C) of the diffractive optical element 38, and the output of the light spot (C) is stable and the efficiency of reliable output is improved.

In summary, the technical means disclosed by the present invention do have invention patent requirements such as "novelty", "progressiveness", and "availability for industrial use". Virtue.

However, the diagrams and descriptions disclosed above are only preferred embodiments of the present invention. Those who are familiar with this art and who make modifications or equivalent changes in accordance with the spirit of this case should still be included in the scope of the patent application in this case.

30A, 30B‧‧‧‧Automatic power control spot emitter 301‧‧‧ Adhesive layer 31‧‧‧Substrate 311‧‧‧ First surface 3111‧‧‧ First conductive pad 3112‧‧‧Metal frame 312‧‧‧ Second surface 3121‧‧‧Second conductive pad 32‧‧‧Automatic power control IC321‧‧‧Detector diode 33‧‧‧Fixed base 34‧‧‧Laser diode 35‧‧‧Light reflection element 36‧ ‧‧Housing 361‧‧‧Accommodation space 362‧‧‧Platform 363‧‧‧Bottom surface 37‧‧‧ Collimating mirror 371‧‧‧Central convex surface 372‧‧‧Ring plane 38‧‧‧ Diffractive optical element 39 ‧‧Press ring structure 391‧‧‧ Ring recess 3911‧‧‧Outer ring surface 3912‧‧‧Light reflection hole 392‧‧‧Press ring 3921‧‧‧Inner ring surface 3922‧‧‧Bottom ring surface W‧‧‧ External lead O‧‧‧External circuit L ₂ ‧‧‧Laser light N ₂ ‧‧‧Stray light C‧‧‧Spot S‧‧‧Light detection signal T‧‧‧Transistor R‧‧‧Resistance G‧‧‧ Ground terminal U‧‧‧Protection circuit U ₁ ‧‧‧ Reference voltage unit U ₂ ‧‧‧Over-temperature protection unit U ₃ ‧‧‧Low voltage lock unit P ₁ ‧‧‧ Supply voltage contact P ₂ ‧‧‧Ground connection Point P ₃ ‧‧‧ Current setting contact P ₄ ‧‧‧ Light detection diode output contact P ₅ ‧‧‧ Laser diode output contact E ₁ ‧‧‧ First ESD circuit E ₂ ‧‧‧ Two ESD circuit E ₃ ‧‧‧ third ESD circuit LE‧‧‧ logic circuit CA‧‧‧ current amplification circuit EA‧‧‧ error amplifier CM‧‧‧ current monitoring circuit VR‧‧‧ variable resistor SS‧‧‧ Start circuit

FIG. 1 is a schematic diagram of a conventional laser diode module. Figure 2 is a schematic diagram of a conventional point transmitter. 3A is an exploded perspective view of the present invention. 3B is a combined perspective view of the present invention. 3C is a cross-sectional view of 3C-3C in FIG. 3B. 4A is an exploded perspective view of another preferred embodiment of the present invention. 4B is a combined perspective view of another preferred embodiment of the present invention. 4C is a cross-sectional view of 4C-4C in FIG. 4B. 5 is a top view of the automatic power control IC of the present invention. 6 is a circuit diagram of the automatic power control IC of the present invention. 7 is a circuit diagram of the automatic power control IC of the present invention.

30A‧‧‧Automatic power control light point transmitter

31‧‧‧ substrate

311‧‧‧First surface

3111‧‧‧The first conductive pad

3112‧‧‧Metal frame

312‧‧‧Second surface

3121‧‧‧Second conductive pad

32‧‧‧Automatic power control IC

321‧‧‧Optical diode

33‧‧‧Fixed seat

34‧‧‧Laser Diode

35‧‧‧Light reflecting element

36‧‧‧Hood

361‧‧‧accommodation space

362‧‧‧Platform

363‧‧‧Bottom

37‧‧‧collimator lens

371‧‧‧Central convex

372‧‧‧Circle Plane

38‧‧‧diffractive optical element

W‧‧‧External wire

Claims (18)

An automatic power control light point transmitter, which comprises: a substrate; an automatic power control IC, which has a light-detecting diode and is fixed on the substrate; a fixing seat is fixed on the substrate; a laser A diode is fixed on the fixing base and is coupled to the automatic power control IC; a light reflecting element is fixed in front of the laser diode; a housing is provided with a housing in sequence The space and a platform above the accommodating space are covered on the substrate so that the automatic power control IC, the laser diode and the light reflecting element are located in the housing, and the accommodating space and The platform is located above the automatic power control IC, the laser diode and the light reflecting element; a collimating mirror is fixed in the accommodating space of the housing so that the collimating mirror is located at the An automatic power control IC, the laser diode and the light reflecting element; and a diffractive optical element, which is adhered to the platform of the housing so that the diffractive optical element is located above the collimating mirror ; By this, the laser diode system projects a laser light on the light reflecting element, so that the light reflecting element perpendicularly emits the laser light system from the collimator lens to the diffractive optical element, so that the diffractive optical The device can generate a plurality of light spots, and the laser light generates a stray light through reflection in the housing, and the stray light is detected by the light detection diode system of the automatic power control IC to form a readable light detection Signal, the light detection signal is to feedback control the output of the laser diode to adjust the power ratio of the laser light, and to control the light of the diffractive optical element according to the power ratio of the laser light Point launch. The automatic power control light point transmitter as described in claim 1, wherein the automatic power control IC is provided with a supply voltage contact, a ground contact, a current setting contact, a photodiode output contact and A laser diode output contact. The automatic power control light point transmitter according to claim 2, wherein the circuit architecture of the automatic power control IC further includes the supply voltage contact is coupled in series to the photodetector diode and in parallel to a resistor and a first An ESD circuit, and the first ESD circuit is coupled in parallel to a ground terminal; a logic circuit is coupled in series to the resistor and the current setting contact; a current amplifier circuit is coupled in series to the photodiode An error amplifier is coupled in parallel to the current amplifier circuit; a protection circuit is coupled in parallel to the error amplifier and has a reference voltage unit, an over-temperature protection unit and a low voltage lock unit; a transistor Respectively coupled in series to the error amplifier, the laser diode output contact and the ground terminal; a current monitoring circuit is coupled in parallel to the ground terminal; a second ESD circuit is coupled in parallel to the current setting terminal Point and the ground terminal; a third ESD circuit, which is respectively coupled in parallel to the current setting contact and the ground terminal; a variable resistor, which is respectively coupled in series to the photodiode output contact and the ground terminal; The laser diode system is coupled in series to the supply voltage contact and the laser diode output contact, respectively. The automatic power control light point transmitter as described in claim 2, wherein the circuit structure of the automatic power control IC further includes a slow start circuit to prevent overcurrent during start. The automatic power control light point transmitter as described in claim 3, wherein, when the logic circuit determines that the current setting contact is set at a high level, the current value of the current monitoring circuit is set to 100 mA, or when the When the logic circuit judges that the current setting contact is set at a low level, the current value of the current monitoring circuit is set to 300 mA. The automatic power control light point transmitter as described in claim 3, wherein when the logic circuit determines that the current setting contact is set at a high level, the voltage value of the reference voltage unit is set to 0.55V, and when When the logic circuit determines that the current setting contact is set at a low level, the voltage value of the reference voltage unit is set to 1.1V; the temperature value of the over-temperature protection unit is set to be greater than 165 degrees and less than 135 degrees; The voltage value of the low voltage lock unit is set to be less than 2.3V and greater than 2.5V. The automatic power control light point transmitter as described in claim 3, wherein the resistance value range of the variable resistor is set at 35Kohm to 1Kohm, the resistance value of the variable resistor is set at 6Kohm, and corresponds to the photodiode The current value of the body is set to 90uA. The automatic power control light point transmitter according to claim 3, wherein the human body model values of the first ESD circuit, the second ESD circuit and the third ESD circuit are set to be greater than or equal to 2KV; the first ESD The mechanical model values of the circuit, the second ESD circuit and the third ESD circuit are set to be greater than or equal to 200V. The automatic power control light spot emitter according to claim 1, wherein the substrate has a first surface and a second surface on the opposite side, the first surface is provided with a first conductive pad and the second surface system A second conductive pad is provided, and the substrate is composed of a circuit board, so that internal wires are formed in the substrate, so that the first conductive pad and the second conductive pad are coupled to each other, and the first conductive pad is composed of a plurality of An external wire is coupled to the automatic power control IC, the laser diode chip and the second conductive pad are coupled to an external circuit. The automatic power control light spot emitter according to claim 1, wherein the collimating lens is formed by any one of a single lens or a micro lens array. The automatic power control light point transmitter according to claim 1, wherein the material of the cover includes any one selected from copper, stainless steel or aluminum. The automatic power control light point transmitter according to claim 1, wherein a metal frame is provided on the first surface of the substrate, and the metal frame surrounds the automatic power control IC, the fixing base and the light reflection Components, and an adhesive layer is provided on the metal outer frame, and the adhesive layer is used to adhere and fix the bottom surface of the casing. The automatic power control light spot emitter according to claim 12, wherein the material of the metal frame includes any one selected from nickel gold or nickel palladium gold. The automatic power control light spot emitter according to claim 12, wherein the material of the adhesive layer comprises any one selected from the group consisting of glue materials and metals. The automatic power control light point transmitter as claimed in claim 14, wherein the glue material comprises any one selected from silicone glue or epoxy resin. The automatic power control light point transmitter according to claim 14, wherein the metal comprises any one selected from gold tin, silver copper, tin silver copper, or indium. The automatic power control light point transmitter according to claim 1, wherein the housing space of the housing further includes a pressure ring structure, the pressure ring structure has a ring recess and a pressure located in the ring recess It is composed of a ring, the outer ring surface of the ring recess is riveted and fixed into the accommodating space of the shell, the ring recess is to receive the collimator lens and the ring recess is provided with a light reflecting hole, and The position of the central convex surface of the collimating mirror, the position of the light reflecting hole and the position of the light reflecting element are vertically corresponding, and the inner annular surface of the pressing ring sets the central convex surface of the collimating lens and the pressing The bottom ring surface of the ring presses the ring plane of the collimating lens. The automatic power control light point transmitter as claimed in claim 1, wherein the platform is located in the casing, so that the platform forms an embedded groove.

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