Optical module

Abstract

The invention discloses an optical module. The optical module comprises a resin packaging body, a lens and a light-emitting element. The resin packaging body is provided with a containing groove. The lens is arranged on the resin packaging body and comprises a light emitting surface, a light incident surface and a central shaft, and the light incident surface is provided with an asymmetric structure. The light-emitting element is arranged in the containing groove, and the light-emitting element is arranged to deviate from the central axis of the lens.

Description

Technical Field

[0001] The present invention relates to an optical module, and in particular to an optical module with a lens of an asymmetric structure. Background Art

[0002] The driver monitoring system (DMS) currently has problems. The monitoring quality is poor in low light conditions, which can lead to misjudgment. Therefore, additional light sources are needed in the car. Figure 1A , Figure 1A Schematic diagram of a conventional light emitting diode package. Figure 1B The light intensity distribution curve shows that the light emitting angle of the traditional light emitting diode package is about 120 degrees to 140 degrees, and the energy of the light source is not concentrated on the face, resulting in energy waste.

[0003] refer to Figure 2A , Figure 2A Schematic diagram of a light emitting diode package with a lens. Figure 2B The light intensity distribution curve of the LED package with the conventional lens 300 only has the function of reducing the divergence angle, but the light pattern is still circular, and there is no effect of deflecting the angle of light. Therefore, when the fatigue driving monitoring module is set on the A-pillar, it may cause uneven fill light. Summary of the invention

[0004] Some embodiments of the present invention provide an optical module. The optical module includes a resin package, a lens and a light-emitting element. The resin package has a receiving groove. The lens is disposed on the resin package, and the lens includes a light-emitting surface, a light-entering surface and a central axis, wherein the light-entering surface has an asymmetric structure. The light-emitting element is disposed in the receiving groove, and the light-emitting element is disposed away from the central axis of the lens.

[0005] The above does not represent every embodiment or every aspect of the present invention, but only provides examples of some novel aspects and features described herein. When combined with the accompanying drawings and the appended claims, the above features and advantages of the present invention and other features and advantages will become apparent from the following detailed description of representative embodiments and methods for implementing the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Through the following detailed description in conjunction with the attached drawings, the viewpoints of the embodiments of the present invention can be better understood. It is worth noting that, according to standard practices in the industry, some components may not be drawn to scale. In fact, the sizes of different components may be increased or reduced in order to clearly describe.

[0007] Figure 1A is a schematic diagram of a conventional light emitting diode package;

[0008] Figure 1Bis a light intensity distribution curve of a traditional light emitting diode;

[0009] Figure 2A is a schematic diagram of a light emitting diode package having a lens;

[0010] Figure 2B is a light intensity distribution curve diagram of a light emitting diode package having a lens;

[0011] Figure 3A A schematic diagram of a fatigue driving monitoring module according to some embodiments of the present invention;

[0012] Figure 3B A side view of a fatigue driving monitoring module according to some embodiments of the present invention;

[0013] Figure 4 A schematic diagram showing the placement of a fatigue driving monitoring module in a vehicle;

[0014] Figure 5 A block diagram of a characteristic functional structure of a fatigue driving monitoring module according to some embodiments of the present invention;

[0015] Figure 6 A diagram showing the relationship between blink frequency and sleepiness intensity distribution according to some embodiments of the present invention;

[0016] Figure 7 A graph showing eyelid closure percentage according to some embodiments of the present invention;

[0017] Figure 8 A three-dimensional perspective view of an optical module according to some embodiments of the present invention;

[0018] Fig. 9A Schematic cross-sectional view of an optical module according to some embodiments of the present invention;

[0019] Fig. 9B Schematic cross-sectional view of an optical module according to some embodiments of the present invention;

[0020] Fig.10 A perspective top view of an asymmetric structure of some embodiments of the present invention;

[0021] Fig.11 A top view of the external structure of a lens according to some embodiments of the present invention;

[0022] Fig.12 A side view of the external structure of a lens according to some embodiments of the present invention;

[0023] Fig.13 This is the light distribution curve diagram of a general light source;

[0024] Fig.14A It is a structural schematic diagram of Comparative Example 1;

[0025] Fig. 14B is the light distribution curve diagram of Comparative Example 1;

[0026] Figure 14C-1 is the illumination distribution diagram of Comparative Example 1;

[0027] Figure 14C-2 is the illumination distribution diagram of the X-axis direction of Comparative Example 1;

[0028] Figure 14C-3 is the Y-axis illumination distribution diagram of Comparative Example 1;

[0029] Figure 14C-4 This is the light angle distribution diagram of Comparative Example 1;

[0030] Fig.14D is a schematic diagram of the relationship between the illumination distribution diagram of Comparative Example 1 and the facial illumination diagram;

[0031] Fig.15A It is a structural schematic diagram of Comparative Example 2;

[0032] Fig. 15B is the light distribution curve diagram of Comparative Example 2;

[0033] Figure 15C-1 is the illumination distribution diagram of Comparative Example 2;

[0034] Figure 15C-2 is the illumination distribution diagram of the X-axis direction of Comparative Example 2;

[0035] Figure 15C-3 is the Y-axis illumination distribution diagram of Comparative Example 2;

[0036] Figure 15C-4 This is the light angle distribution diagram of Comparative Example 2;

[0037] Fig.15D is a schematic diagram of the relationship between the illumination distribution diagram of Comparative Example 2 and the facial illumination diagram;

[0038] Fig.16A are light distribution curve diagrams of some embodiments of the present invention;

[0039] Figure 16B-1 is the illumination distribution diagram of the present invention;

[0040] Figure 16B-2 It is the illumination distribution diagram of the X-axis direction of the present invention;

[0041] Figure 16B-3 is the Y-axis illumination distribution diagram of Comparative Example 1;

[0042] Figure 16B-4 is the light angle distribution diagram of the present invention;

[0043] Fig. 16CSchematic diagram of the relationship between an illumination distribution diagram and a facial illumination diagram according to some embodiments of the present invention.

[0044] Explanation of symbols

[0045] 10: Resin package

[0046] 11: Lead frame

[0047] 11A: Positive lead frame

[0048] 11B: Negative lead frame

[0049] 14: Storage tank

[0050] 100: Light emitting element

[0051] 200: Lens

[0052] 300: Traditional lens

[0053] 210: Light emitting surface

[0054] 220: Light incident surface

[0055] 230: Lens base

[0056] 2200: Asymmetric structure

[0057] C: Center axis

[0058] R1: First Area

[0059] R2: Second Area

[0060] R3: The third area

[0061] R4: The fourth area

[0062] D1: First direction

[0063] D2: Second direction

[0064] D3: Third direction

[0065] 1000: Optical module

[0066] 10000: Fatigue driving monitoring module

[0067] 4000: Image capture unit

[0068] 5000: Computing unit

[0069] 6000: Warning module

[0070] 6200: Display unit

[0071] 6300: Vibration unit

[0072] 6400: Alarm sound unit

[0073] 7000: Protection element

[0074] 20000: Vehicles

[0075] 21000: A-pillar

[0076] LA: Long axis

[0077] SA: short axis

[0078] HL: Light emitting surface height

[0079] H1: Maximum height of asymmetric structure

[0080] WB: Lens base width

[0081] LB: Lens base length

[0082] L: Asymmetric structure length

[0083] HB: Lens base height

[0084] HR: Resin package height

[0085] W1: First width

[0086] W2: Second width

[0087] W3: Third width

[0088] W4: fourth width DETAILED DESCRIPTION

[0089] The following disclosure provides different embodiments for implementing different components in the provided packaging structure. Specific examples of each component and its configuration are described below to simplify the embodiments of the present invention, and are certainly not intended to limit the present invention. For example, if the description mentions that a first component is formed on a second component, it may include an embodiment in which the first component and the second component are in direct contact, and it may also include an embodiment in which an additional component is formed between the first component and the second component so that the first component and the second component are not in direct contact. In addition, the present invention may repeat component symbols and / or characters in different embodiments or examples. Such repetition is for simplicity and clarity, and is not used to indicate the relationship between the different embodiments and / or examples discussed.

[0090] The present invention provides a fatigue driving monitoring module 10000. Please refer to Figure 3A , Figure 3ASchematic diagram of a fatigue driving monitoring module 10000 according to some embodiments of the present invention. The fatigue driving monitoring module 10000 includes an image capture unit 4000, an optical module 1000 and a computing unit 5000 (not shown). The fatigue driving monitoring module 10000 can detect whether the driver is fatigued through the image capture unit 4000, the optical module 1000 and the computing unit 5000 (not shown). The image capture unit can be a camera sensor 4000 (Camera sensor), such as a Charge-Coupled Device (CCD) or a CMOS (Complementary Metal-Oxide-Semiconductor) photosensitive element. The optical module 1000 includes an infrared diode.

[0091] In some embodiments, the wavelength of the infrared diode ranges from 830 nanometers to 950 nanometers. In some embodiments, the wavelength of the infrared diode can be 940 nanometers. In some embodiments, the wavelength of the infrared diode can be 850 nanometers.

[0092] Please refer to Figure 3B , Figure 3B The figure is a side view of a fatigue driving monitoring module according to some embodiments of the present invention. The fatigue driving monitoring module 10000 further includes a protective element 7000, which is disposed around the image capture unit 4000 and the optical module 1000. The protective element 7000 is used to protect the image capture unit 4000 and the optical module 1000. The protective element 7000 can be used to prevent dust. The protective element 7000 can be glass or poly(methylmethacrylate), PMMA.

[0093] Please refer to Figure 4 , Figure 4 FIG. 1 is a schematic diagram of a fatigue driving monitoring module 10000 placed in a vehicle 20000. The fatigue driving monitoring module 10000 can be placed at the A-pillar 21000 of the vehicle 20000. The fatigue driving monitoring module 10000 has an optical module 1000 for providing a light source.

[0094] Please refer to Figure 5 , Figure 5 FIG. 1 is a block diagram of the characteristic functional structure of the fatigue driving monitoring module 10000. When the image capture unit 4000 captures the driving image, and the optical module 1000 performs supplementary light source, and cooperates with Figure 6 Blinking frequency and sleepiness intensity distribution diagram or Figure 7The calculation unit 5000 uses an algorithm to analyze the driver's fatigue state and find out whether the driver fell asleep while driving. Therefore, the calculation unit 5000 can obtain the driver's fatigue state data or sleepiness level. The calculation unit 5000 can be a central processing unit (CPU). The calculation unit 5000 outputs the driver's fatigue state data or sleepiness level information to the warning module 6000 to notify the driver or passengers. The warning module 6000 may include a display unit 6200, a vibration unit 6300 and an alarm sound unit 6400. In some embodiments, the display unit 6200 converts the obtained fatigue state data or sleepiness level information into an image or text display, so that the driver or passenger can see the driver's fatigue state data or sleepiness level. If the sleepiness level reaches 3 to 5 (please refer to Figure 6 ), reminding the driver to stop driving or let the passenger drive instead. The display unit 6200 may be a liquid crystal panel or a micro-LED display. The display unit 6200 may be a smart phone or a tablet computer. In some embodiments, the computing unit 5000 outputs the driver's fatigue status data or sleepiness level information to the vibration unit 6300 of the warning module 6000. If the driver reaches the sleepiness level 3 to 5 (please refer to Figure 6 ), the vibration unit 6300 will start to vibrate the steering wheel or the driver's seat. In some embodiments, the vibration unit 6300 will gradually increase the vibration intensity of the steering wheel or the driver's seat to remind the driver to stay alert, stop driving, or let the passenger drive instead. In some embodiments, the higher the sleepiness level, the stronger the vibration intensity of the steering wheel or the driver's seat. In some embodiments, the computing unit 5000 outputs the driver's fatigue state data or sleepiness level information to the alarm sound unit 6400 of the warning module 6000, and the alarm sound unit 6400 will sound an alarm to remind the driver to stay alert or stop driving or let the passenger drive instead. In some embodiments, the higher the sleepiness level, the louder the alarm sound will be.

[0095] Please refer to Figure 6 , Figure 6: is a relationship diagram of the distribution of blinking frequency and sleepiness intensity. In some embodiments, when the driver is in a fatigued state, the blinking frequency and the time required for blinking will change. In addition, when the driver's fatigue level increases, the driver's eye closing time will increase, thus affecting the driver's driving performance. When the driver's fatigue level increases, the driver's blinking frequency will increase, thus affecting the driver's driving performance. The sleepiness level is divided into levels 1 to 5. When the blinking frequency is very low, it shows that the driver's sleepiness intensity is very low, and the sleepiness level is the first level. When the blinking frequency is the highest, it shows that the driver's sleepiness intensity is the highest, the sleepiness level is the fifth level, and the driver's fatigue level is the highest. When the calculation unit 5000 uses an algorithm to calculate that the driver's blinking frequency is very high, it can be obtained that the driver's fatigue level is very high, and a warning message is further issued.

[0096] Please refer to Figure 7 , Figure 7 is an eyelid closure percentage graph. In some embodiments, the driver's fatigue state is analyzed using the eyelid closure percentage (PERCLOS). When the eyelid closure percentage exceeds 75% or 80%, it indicates that the driver is in a fatigue state.

[0097] In some embodiments, the optical module 1000 of the fatigue driving monitoring module 10000 includes an infrared diode. When the brightness in the car is insufficient, when the camera in the car captures the image of the driver, the optical module 1000 of the fatigue driving monitoring module 10000 can be used as a supplementary light source, and the driver's state can be analyzed more accurately. In some embodiments, the optical module 1000 includes an infrared diode, and the infrared diode is used as a supplementary light source. Since the driver cannot see infrared rays, when the infrared diode is used as a supplementary light source, it will not affect the driver's line of sight.

[0098] The present invention provides an optical module 1000. The optical module 1000 can be used as a light source of a fatigue driving monitoring module 10000.

[0099] refer to Figure 8 and Fig. 9A , Figure 8 is a stereoscopic perspective view of an optical module according to some embodiments of the present invention, Fig. 9AThe cross-sectional schematic diagram of the optical module of some embodiments of the present invention, the optical module 1000 includes a resin package 10, a lens 200 and a light-emitting element 100. The resin package 10 has a lead frame 11 and a resin part 12. The lead frame 11 includes a positive lead frame 11A and a negative lead frame 11B. The resin part 12 forms a receiving groove 14. The light-emitting element 100 is disposed in the receiving groove 14, and is disposed on the lead frame 11, and is electrically connected to the lead frame 11. The light-emitting element 100 has a first electrode (not shown) electrically connected to the positive lead frame 11A, and the light-emitting element 100 has a second electrode (not shown) electrically connected to the negative lead frame 11B. The light-emitting element 100 can be a vertical light-emitting diode, a flip-chip light-emitting diode or a horizontal light-emitting diode. In some embodiments, the light-emitting element 100 is a vertical light-emitting diode, the first electrode is electrically connected to the positive lead frame 11A, and the second electrode is electrically connected to the negative lead frame 11B through a wire (not shown).

[0100] refer to Figure 8 and Fig. 9A The lens 200 is disposed on the resin portion 12 of the resin package 10. The lens 200 includes a light emitting surface 210, a light incident surface 220, a central axis, and a lens base 230. The light incident surface 220 has an asymmetric structure 2200. The light emitting element 100 is disposed away from the central axis C of the lens 200. In some embodiments, there is an air gap between the light incident surface 220 and the light emitting element 100.

[0101] refer to Fig. 9B With reference Fig.10 , Fig. 9B 2 is a cross-sectional view of an optical module according to some embodiments of the present invention. The asymmetric structure 2200 includes a first region R1, a second region R2, a third region R3, and a fourth region R4. Fig.10 , Fig.10 It is a top perspective view of an asymmetric structure of a lens 2200 according to some embodiments of the present invention. The asymmetric structure 2200 includes a first region R1, a second region R2, a third region R3, and a fourth region R4.

[0102] refer to Fig. 9B , Fig. 9B Schematic cross-sectional views of optical modules of some embodiments of the present invention. From the schematic cross-sectional views, in some embodiments, the asymmetric structure 2200 has a first curvature in the first region; the asymmetric structure 2200 has a second curvature in the second region; the asymmetric structure 2200 has a third curvature in the third region. The asymmetric structure 2200 has a fourth curvature in the fourth region. When the third region R3 contacts the central axis C, it enters the fourth region.

[0103] refer to Fig. 9BIn some embodiments, the first curvature is greater than the third curvature, the third curvature is greater than the fourth curvature, and the fourth curvature is greater than the second curvature.

[0104] refer to Fig. 9B In some embodiments, in the first region, the asymmetric structure 2200 is a convex surface; in the second region, the asymmetric structure 2200 is a convex surface; in the third region, the asymmetric structure 2200 is a concave surface; and in the fourth region, the asymmetric structure 2200 is a concave surface.

[0105] refer to Fig. 9B In some embodiments, along the first direction, the protrusion height of the asymmetric structure 2200 in the third direction is uneven.

[0106] refer to Fig. 9B In some embodiments, along the first direction, in the first region, the protrusion height of the asymmetric structure in the third direction gradually increases; in the second region, the protrusion height of the asymmetric structure 2200 in the third direction still gradually increases, but the slope of the height increase is lower than that of the first region, and in the middle position of the second region, the protrusion height of the asymmetric structure 2200 in the third direction reaches the maximum height H1 of the asymmetric structure; in the third region, the protrusion height of the asymmetric structure 2200 in the third direction gradually decreases; in the fourth region, the protrusion height of the asymmetric structure 2200 in the third direction gradually decreases to a substantially uniform height. Reference Fig. 9B In some embodiments, the asymmetric structure is a convex structure similar to a slide. In some embodiments, the maximum height H1 of the asymmetric structure does not overlap with the central axis C of the lens 200. In some embodiments, the highest point of the asymmetric structure does not overlap with the central axis C of the lens 200.

[0107] In some embodiments, the maximum height H1 of the asymmetric structure 2200 in the third direction is 0.88 mm. In some embodiments, the maximum height H1 of the asymmetric structure 2200 in the third direction is in a range of 0.5 mm to 2 mm.

[0108] refer to Fig.10 In some embodiments, when viewed from a top perspective, the asymmetric structure 2200 is symmetric in the second direction D2 and asymmetric in the first direction D1.

[0109] refer to Fig.10In some embodiments, from the perspective of the top view, in the first region R1, the asymmetric structure 2200 has a first width W1, and the width of the asymmetric structure 2200 in the second direction D2 gradually increases along the first direction D1, and the width of the asymmetric structure 2200 increases to a second width W2, that is, in the first region R1, the width of the asymmetric structure 2200 in the second direction D2 increases from W1 to W2; in the second region R2, the width of the asymmetric structure 2200 in the second direction D2 along the first direction D1 is substantially the same, and the width of the asymmetric structure 2200 in the second direction D2 is the second width W2; in the third region R3 , along the first direction D1, the width of the asymmetric structure 2200 in the second direction D2 is substantially the same, and the width of the asymmetric structure 2200 in the second direction D2 is the third width W3, wherein the second width W2 and the third width W3, when the third region R3 contacts the central axis C, that is, enters the fourth region; in the fourth region R4, along the first direction D1, the width of the asymmetric structure 2200 in the second direction D2 gradually decreases, and the width of the asymmetric structure 2200 gradually decreases to the fourth width W4, that is, in the fourth region R4, the width of the asymmetric structure 2200 in the second direction D2 decreases from the third width W3 to the fourth width W4.

[0110] In some embodiments, the first width W1 ranges from 0.65 mm to 0.95 mm (millimeter, mm), the second width W2 ranges from 1.05 mm to 1.35 mm, the third width W3 ranges from 1.05 mm to 1.35 mm, and the fourth width W4 ranges from 0.65 mm to 0.95 mm. In some embodiments, the first width W1 is 0.80 mm, the second width W2 is 1.2 mm, the third width W3 is 1.2 mm, and the fourth width W4 is 0.8 mm.

[0111] In some embodiments, the asymmetric structure 2200 has an asymmetric structure length L when viewed from a top perspective. The asymmetric structure length L ranges from 1.5 mm to 3.5 mm. In some embodiments, the asymmetric structure length L can be 2.38 mm.

[0112] refer to Fig.11 , Fig.112 is a top view of the external structure of the lens of some embodiments of the present invention. The light exit surface 210 of the lens 200 is elliptical and the lens base 230 is rectangular. In some embodiments, the lens base width WB is 2.5 mm to 4.5 mm. The lens base length LB is 2.5 mm to 4.5 mm. In some embodiments, the lens base width WB of the lens base 230 is 3.5 mm and the lens base length LB is 3.5 mm. In some embodiments, the major axis LA of the elliptical light exit surface 210 can be 2 mm to 4 mm, and the minor axis SA of the elliptical light exit surface 210 is 1.5 mm to 3.5 mm. In some embodiments, the major axis LA of the elliptical light exit surface 210 is 3 mm and the minor axis SA is 2.52 mm.

[0113] refer to Fig.12 , Fig.12 : is a side view of the external structure of the lens of the present invention. In some embodiments, the lens base height HB can be 0.15 mm to 0.25 mm. In some embodiments, the lens base height HB is 0.18 mm. In some embodiments, the light emitting surface height HL can be 1.5 mm to 3.5 mm. In some embodiments, the light emitting surface height HL can be 2.4 mm. In some embodiments, the resin package height HR is 0.7 mm.

[0114] refer to Fig.13 , the light distribution curve of a general light source (such as a light emitting diode), a general light emitting diode has a Lambertine distribution.

[0115] refer to Fig.14A , Fig.14A Schematic diagram of the structure of Comparative Example 1. In Comparative Example 1, a conventional lens 300 covers the light emitting element 100 , and the light emitting element 100 is arranged on the central axis C of the conventional lens 300 .

[0116] refer to Fig. 14B , Fig. 14B This is the light distribution curve diagram of Comparative Example 1. Comparative Example 1 can reduce the divergence angle, but cannot produce the effect of light deflection angle.

[0117] refer to Figure 14C-1 , Figure 14C-1 This is the illumination distribution diagram of Comparative Example 1. The irradiance is still concentrated in the center (0,0) and is a circular light type. And the light does not produce any deflection. Figure 14C-2 , Figure 14C-2 This is the X-axis illuminance distribution diagram of Comparative Example 1. The maximum irradiance intensity is near the X-axis origin, and the irradiance gradually decreases away from the X-axis origin. Figure 14C-3 , Figure 14C-3This is the Y-axis illuminance distribution diagram of Comparative Example 1. The maximum irradiance intensity is near the Y-axis origin, and the irradiance gradually decreases away from the Y-axis origin. Figure 14C-4 , Figure 14C-4 This is the light angle distribution diagram of Comparative Example 1. The illumination percentage at 0 degree is 100%. The illumination percentage decreases toward positive 90 degrees and negative 90 degrees, and the light does not deflect at all.

[0118] Comparative Example 1 is that the light pattern of the conventional lens 300 is circularly symmetrical. When the fatigue driving monitoring module is set on the A-pillar 21000 of the vehicle, the light source on the left face of the driver may be insufficient, and a dark area will be generated in the corner of the light pattern, but the light source on the right face may be overexposed, which is not conducive to the image capture unit 4000 (Camera sensor) capturing the driver's image. In addition, the light pattern of the conventional lens 300 does not have the effect of off-axis light. Therefore, when the fatigue driving monitoring module is set on the A-pillar 21000 of the vehicle, if it is not offset, there will be a problem that the supplementary light source for the driver's face cannot effectively cover the face.

[0119] refer to Fig.14D ,Comparing the relationship between the illumination distribution diagram of Example 1 and the face illumination diagram, the rectangular frame represents the position of the driver's face. When the fatigue driving monitoring module is set on the vehicle A-pillar 21000, since the light pattern of the traditional lens 300 is circularly symmetrical, the light source will be distributed and concentrated on the right side of the frame, that is, the light source intensity near the right face of the driver is very strong, while the light source intensity near the left face of the driver is very weak.

[0120] Refer to Table 1, which is an intensity distribution analysis table of Comparative Example 1. From the values ​​in Table 1, it can be seen that the light intensity distribution in the rectangular frame of Comparative Example 1 is uneven, and the light intensity is concentrated on the right side of the rectangular frame.

[0121]

[0122] Table 1. Strength distribution analysis table of comparative example 1

[0123] Refer to Table 2, which is a uniformity analysis table of Comparative Example 1. From the values ​​in Table 2, it can be seen that the light intensity uniformity of Comparative Example 1 is not good, and it is too concentrated on the right side of the rectangular frame. That is, the light intensity near the right face of the driver is very strong, while the light intensity near the left face of the driver is very weak.

[0124]

[0125] Table 2. Uniformity analysis table of comparative example 1

[0126] Please refer to Fig.15A , Fig.15A: is a schematic diagram of the structure of comparative example 2. In comparative example 2, the conventional lens 300 covers the light emitting element 100, and the light emitting element 100 is arranged away from the central axis C of the conventional lens 300. Comparative example 2 will produce an angular deflection of the light pattern, but cannot make the light pattern become a rectangular light.

[0127] refer to Fig. 15B , Fig. 15B This is the light distribution curve of Comparative Example 2. Comparative Example 2 can reduce the divergence angle and make the light produce a deflection angle effect. The light in the X-axis direction will have a deflection angle of minus 20 degrees to minus 30 degrees. But the light in the Y-axis direction is not deflected. However, Comparative Example 2 is still a circular light type.

[0128] refer to Figure 15C-1 This is the illuminance distribution diagram of Comparative Example 2. The highest irradiance is located at (-100,0), that is, the light is offset 100 mm in the negative direction of the X-axis, but the light in the Y-axis direction is not offset. From the illuminance distribution of Comparative Example 2, Comparative Example 2 is still a circular light type. Figure 15C-2 , Figure 15C-2 This is the X-axis illuminance distribution diagram of Comparative Example 2, where the maximum irradiance intensity is near 100 mm in the negative direction of the X-axis. Figure 15C-3 , Figure 15C-3 This is the Y-axis illuminance distribution diagram of Comparative Example 2. The maximum irradiance intensity is near the Y-axis origin, and the irradiance gradually decreases away from the Y-axis origin. Figure 15C-4 , Figure 15C-4 This is the light angle distribution diagram of Comparative Example 2. When the illumination percentage is 100%, the light in the X-axis direction will have a deflection angle of minus 20 degrees to minus 30 degrees, but the light in the Y-axis direction will not be deflected.

[0129] refer to Fig.15D , Fig.15D The relationship between the illumination distribution diagram of Comparative Example 2 and the facial illumination diagram, the rectangular frame represents the position of the driver's face. When the fatigue driving monitoring module is set on the A-pillar 21000 of the vehicle. Comparative Example 2 uses a traditional lens 300, so the light type is a circular light type, and the light-emitting element 100 is set to deviate from the central axis C of the traditional lens 300, so there will be an off-axis light effect. Although there is an off-axis light effect, because it is a circularly symmetrical light type, it is still not enough to evenly supplement the light source on the driver's face. In addition, since part of the light will be irradiated on the face of the non-driver, the utilization efficiency of the light source is relatively poor.

[0130] Refer to Table 3, which is an intensity distribution analysis table of Comparative Example 2. From the values ​​in Table 3, it can be seen that the light intensity distribution in the rectangular frame of Comparative Example 2 is uneven, the light intensity in the center of the rectangular frame is the strongest, the light intensity on the right side of the rectangular frame is the second strongest, and the light intensity on the left side of the rectangular frame is the lowest.

[0131]

[0132] Table 3. Strength distribution analysis table of comparative example 2

[0133] Refer to Table 4, which is a uniformity analysis table of Comparative Example 2. From the values ​​in Table 4, it can be seen that the light intensity uniformity of Comparative Example 2 is not good, the uniformity is 100% in the center of the rectangular frame, but the uniformity of the light source near the right face of the driver and the left face of the driver is different.

[0134]

[0135] Table 4. Uniformity analysis table of comparative example 2

[0136] refer to Fig.16A , light distribution curves of some embodiments of the present invention. Please refer to Figure 8 The present invention uses a lens 200 including a light emitting surface 210 and a light incident surface 220. The light incident surface 220 of the lens 200 has an asymmetric structure 2200. The lens 200 is disposed on the resin portion 12 of the resin package 10, and the light emitting element 100 is disposed away from the central axis C of the lens 200.

[0137] Fig.16A This is a light distribution curve diagram of some embodiments of the present invention. The maximum intensity in the Y-axis direction is weakened to 50% to 60%, and the deflected light generated in the X-axis direction is about 20 degrees to 30 degrees and the intensity is 100%. Therefore, rectangular light and deflection angle can be generated. That is, the present invention controls the deflection angle and rectangular light generated by the light through the curvature of the asymmetric structure 2200 of the lens, and controls the deflection of the light angle by setting the light-emitting element 100 away from the central axis C of the lens 200 to achieve maximum light energy utilization. Some embodiments of the present invention reduce the light beam angle and deflect the angle at the same time, and make the light pattern form a rectangular light pattern, which can effectively utilize the light source and through the deflection angle, so that the image capture unit 4000 (Camera sensor) can obtain the best image.

[0138] refer to Figure 16B-1 This is the illumination distribution diagram of the present invention. From the illumination distribution diagram, it can be seen that the light source is a rectangular light, and the light will have an offset of about 100 mm in the negative direction of the X axis. Some embodiments of the present invention are rectangular lights with offset. Figure 16B-2 , Figure 16B-2 This is the X-axis illuminance distribution diagram of the present invention. At the position (0, 0), the irradiance is 5×10 -6 (W / mm 2 ). The irradiance is strongest in the negative direction of the X-axis from 10 mm to 200 mm, and weaker in the positive direction of the X-axis from 50 mm to 250 mm. Figure 16B-3 , Figure 16B-3This is the Y-axis illuminance distribution diagram of Comparative Example 1. The irradiance is strongest near the Y-axis origin and gradually decreases away from the Y-axis origin. Figure 16B-4 , Figure 16B-4 The light angle distribution diagram of the present invention shows that the light in the X-axis direction will be deflected at a deflection angle of minus 20 degrees to minus 30 degrees when the illumination percentage is 100%. However, the light in the Y-axis direction is not deflected, and at the 0 degree position, the illumination percentage is reduced to about 50% to 60%.

[0139] refer to Fig. 16C , Fig. 16C The relationship between the illumination distribution diagram of the present invention and the face illumination diagram, the rectangular frame represents the position of the driver's face. When the fatigue driving monitoring module is set on the vehicle A-pillar 21000. The present invention uses a lens 200, and the light incident surface 220 of the lens 200 has an asymmetric structure 2200, which generates rectangular light, so that the effective illumination area of ​​the light source can cover the driver's face, so the utilization efficiency of the light source is good.

[0140] Referring to Table 5, which is an intensity distribution analysis table of the present invention, it can be seen from the values ​​in Table 5 that the light intensity distribution in the rectangular frame of the present invention is not much different, and the light intensity in the center of the rectangular frame, the intensity on the right side of the rectangular frame, and the intensity on the left side of the rectangular frame are not much different.

[0141]

[0142] Table 5. Strength distribution analysis table of the present invention

[0143] Refer to Table 6, which is a uniformity analysis table of the present invention. From the values ​​in Table 6, it can be seen that the light intensity uniformity of the present invention is better, and the uniformity is 100% in the center of the rectangular frame, but the uniformity of the light source near the right face of the driver and the left face of the driver is similar.

[0144]

[0145] Table 6. Uniformity analysis table of the present invention

[0146] From Table 1, Table 3 and Table 5, the strength of the present invention in the center of the rectangular frame is increased by 84.29% compared with Comparative Example 1, the strength of the present invention in the center of the rectangular frame is increased by 45.33% compared with Comparative Example 2, the strength of the present invention in the upper left corner of the rectangular frame is increased by 196% compared with Comparative Example 1, the strength of the present invention in the upper left corner of the rectangular frame is increased by 89.30% compared with Comparative Example 2, the strength of the present invention in the lower left corner of the rectangular frame is increased by 185% compared with Comparative Example 1, and the strength of the present invention in the lower left corner of the rectangular frame is increased by 86.04% compared with Comparative Example 2.

[0147] From Table 2, Table 4 and Table 6, in terms of uniformity, the uniformity at the upper left corner of the rectangular frame must reach 80%. The uniformity at the upper left corner of the rectangular frame of the present invention is 32.29% higher than that of Comparative Example 1, the uniformity at the upper left corner of the rectangular frame of the present invention is 19.94% higher than that of Comparative Example 2, the uniformity at the lower left corner of the rectangular frame of the present invention is 29.65% higher than that of Comparative Example 1, and the uniformity at the lower left corner of the rectangular frame of the present invention is 18.44% higher than that of Comparative Example 2.

[0148] Furthermore, since the fatigue driving monitoring module is installed on the vehicle A-pillar 21000, if there is no light offset, the driver's face will be filled with light and the face cannot be effectively covered. Therefore, when supplementing the light source, the light needs to be offset at a certain angle and the light pattern needs to be formed into a rectangular light so that the effective irradiation area of ​​the light source can cover the driver's face.

[0149] As long as the components between the embodiments of the present invention do not violate the spirit of the invention or conflict with each other, they can be mixed and matched for use at will. In addition, the scope of protection of the present invention is not limited to the manufacturing process, machine, manufacture, material composition, device, method and steps in the specific embodiment described in the specification. Any ordinary technician in the field can understand the current or future developed manufacturing process, machine, manufacture, material composition, device, method and steps from the disclosure of the present invention. As long as substantially the same function can be implemented in the embodiments described herein or substantially the same result can be obtained, they can be used according to the present invention. Therefore, the scope of protection of the present invention includes the above-mentioned manufacturing process, machine, manufacture, material composition, device, method and steps. Any embodiment or claim of the present invention is not required to achieve all the purposes, advantages and / or features disclosed in the present invention.

Claims

1. An optical module, comprising: A resin package having a receiving groove; A lens, the lens is disposed on the resin package, the lens comprises a light emitting surface, a light incident surface and a central axis, wherein the light incident surface has an asymmetric structure; as well as A light emitting element is disposed in the accommodating groove, and the light emitting element is disposed away from the central axis of the lens.

2. The optical module according to claim 2, wherein: The asymmetric structure includes a first region, a second region, a third region and a fourth region. 3 . The optical module of claim 1 , wherein in a top perspective view, the asymmetric structure is symmetric in the second direction and asymmetric in the first direction.

4. The optical module as claimed in claim 2, wherein in a top perspective view, in the first region, the width of the asymmetric structure in the second direction along the first direction gradually increases; in the second region, the width of the asymmetric structure in the second direction along the first direction is substantially uniform; in the third region, the width of the asymmetric structure in the second direction along the first direction is substantially uniform; in the fourth region, the width of the asymmetric structure in the second direction along the first direction gradually decreases.

5. The optical module as claimed in claim 2, wherein in the cross-sectional view, in the first region, the asymmetric structure has a first curvature; in the second region, the asymmetric structure has a second curvature; in the third region, the asymmetric structure has a third curvature; and in the fourth region, the asymmetric structure has a fourth curvature.

6. The optical module as claimed in claim 5, wherein in the cross-sectional view, in the first region, the asymmetric structure is a convex surface; in the second region, the asymmetric structure is a convex surface; in the third region, the asymmetric structure is a concave surface; in the fourth region, the asymmetric structure is a concave surface. 7 . The optical module as claimed in claim 1 , wherein in a cross-sectional view, a protrusion height of the asymmetric structure of the light incident surface along the first direction in a third direction is non-uniform.

8. The optical module as claimed in claim 5, wherein in the cross-sectional view, along the first direction, in the first region, the protrusion height of the asymmetric structure in the third direction gradually increases; in the middle position of the second region, the protrusion height of the asymmetric structure in the third direction reaches the maximum height of the asymmetric structure; in the third region, the protrusion height of the asymmetric structure in the third direction gradually decreases. 9 . The optical module as claimed in claim 1 , wherein in a cross-sectional view, the asymmetric structure is a convex structure shaped like a slide. 10 . The optical module of claim 8 , wherein in a cross-sectional view, a highest point of the asymmetric structure does not overlap with a central axis of the lens.

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