TWI425292B - Method and apparatus for external infrared imaging on a mobile phone - Google Patents

Description

Method and apparatus for external infrared imaging on a mobile phone

The invention relates to a device which can be externally attached to a mobile phone, in particular to a method for assisting infrared imaging of a mobile phone by modulating different infrared radiation intensity and infrared passing by an external device.

Current phone overview

The internal image sensor of the mobile phone/smart phone, which is used in the market for communication, can sense wavelengths from visible light to infrared (400 nm to 1,000 nm). Therefore, in the place where the ambient illumination is insufficient, the illumination of the auxiliary light source (such as the illumination lamp or the infrared light source) can cause the image sensor in the mobile phone to sense the visible light or the infrared image.

Usually, in order to save power, most of the internal image sensors use CMOS (Complementary Metal Oxide Semiconductor) CMOS (Complementary Metal Oxide Semiconductor), and very few high-end or special-purpose users will use CCD (Charge-Coupled). Device) Photocharged coupling device.

Just like a common camera, the image sensor inside the phone is also equipped with a filter that blocks infrared (line) (such as the commonly known blue glass or ICF filter) or film to block infrared access (IR). -CUT) causes the image to be "reddish". The industry is generally called the infrared cut filter ICF (Infrared Cut Filter), as shown in Figure 1.

Please refer to Figure 1 for the cut-off diagram of the IR cut filter.

1 includes visible light Lvi (Visible Light), infrared (or infrared) Lir (Infrared Light), a protective transparent glass (or called lens Len) 11, an infrared cut filter 12, an image sensor 13 .

The ambient light (such as sunlight) contains visible light Lvi and infrared Lir (of course, UV UV, microwave Micro wave, etc. are omitted), which is incident on the transparent glass 11 of the mobile phone and then passed through an infrared intercept. The vertical filter 12 passes only the visible light Lvi because the infrared cut filter 12 turns off the infrared light Lir. Therefore, only the visible light Lvi enters the image sensor 13 and is imaged.

After the visible light Lvi enters the latter stage of the image sensor 13 and the image processor DSP, the image of the so-called True Color can be taken. Otherwise, the image taken in the sun will be somewhat [biased] red due to the intervention of infrared light, and the general industry has a false color (False color).

The above method of cutting off the infrared Lir can be roughly divided into two types: infrared Lir [reflection] or infrared Lir [absorption]. For example, the coated ICF is mostly of the [reflective] infrared Lir type and the blue glass is the [absorption] infrared Lir type.

The coated ICF is more expensive than the blue glass.

Please refer to Figure 1A for a blue glass cut-off infrared spectrum.

Using infrared-absorbing blue glass, the blue glass functions like a crystal material ICF filter, which has a visible light transmittance of about 90% at an incident wavelength of 400 to 700 nm, but is incapable of being absorbed by an infrared incident at 700 to 1,000 nm. by.

As shown in Figure A, the peak of the blue glass cut-off infrared spectrum is at 500 nm, which is softer for the human eye in the visible light Lvi range of about 380 nm to 600 nm. For the coated film of Figure 1C, the quality of the image (not reddish) appears to be good. Some high-end communication mobile phones will be additionally coated with an anti-reflection AR film to improve the quality of imaging.

Generally, in a mobile phone with a photographic function, in order to achieve video recording at night (or insufficient ambient illumination), there are basically two methods: the first one is to assist the white light (visible light) visible to the human eye. The method of illumination and the second method is a method of projecting infrared-assisted radiation that is invisible to the human eye.

The first type of projection LED white light (when recording) or flash (when taking pictures) is used to assist the mobile phone in the case of insufficient ambient white light illumination, so that the image sensor inside the mobile phone can be induced as if it had enough lighting environment during the day. To the visible light image, the mobile phone can capture images in visible light.

The second type is an infrared source (infrared source, such as a radiant infrared light-emitting diode IR-LED), which is used to assist the illumination in the mobile phone environment when the infrared is insufficient, so that the image sensor in the mobile phone is in a dark environment. With enough infrared energy illumination, infrared images can be sensed, so that the phone can capture infrared mono images. However, for the second method of imaging an infrared source, it is a prerequisite that the infrared can pass through an image sensor in the cell phone. If ICF is added, it is obvious that the image quality is poor or cannot be imaged.

For the second method of projecting the infrared light source, in recent years, some manufacturers have demonstrated the smart phone with Night Vision function, so that the mobile phone can capture the function of infrared monochrome image, which is roughly adopted. Two types of processing methods: the first is a software processing method; the second is a hardware processing method.

In the first type of software processing, most of the color image of visible light is used to apply the software program to process the color image of the visible light for the subsequent color matching. The night vision effect of the software simulation can be displayed on the LCD screen of the machine.

For example, in the smart phone iPhone produced by Apple in 2010, the user can download the Photo-Desk software in the App Store, and then display the “simulation” on the LCD screen of the mobile phone. Infrared images, not the real infrared image of the iPhone.

In the second type of hardware processing, most of them are attached to the mobile phone image sensor 13 as a day and night type filter. In this way, color visible light images can be taken during the day, and infrared images can be taken in the evening with the aid of the infrared light source.

However, in the second type of hardware processing, the mobile phone image sensor 13 can simultaneously pass visible light and infrared light, as shown in FIG. 1B and C.

In recent years, including the security surveillance camera (Security Camera for environment), the handheld video camera (Digital Video Camcorder) and some high-end smart phones and other devices with camera function, the image sensor of the camera is mostly A day and night filter is provided so that the incident light in the visible range and the infrared range can be inductively imaged into the image sensor through the filter of this type.

Please refer to Figure 1B for a schematic diagram of day and night filter imaging.

In Fig. 1B, the ambient light (for example, sunlight) contains visible light Lvi and infrared Lir, which is incident on the protective transparent glass 11 of the mobile phone and then passed through the day and night filter 14 due to the day and night filter 14 It can pass both visible light Lvi and infrared Lir at the same time, and finally can be inductively imaged by entering its image sensor. Therefore, color visible light images can be taken during the day, and infrared images can be taken with the aid of the infrared light source.

However, as shown in FIG. 1B, the infrared Lir incident on the protective transparent glass 11 passes. Before and after the day and night filter 14 is divided into infrared rays having two different energies: the energy of the infrared Lir/1 before passing through the day and night filter 14, and the energy of the infrared Lir/2 after passing through the day and night filter 14 The energy of the infrared Lir/1 shown in the figure is relatively significantly greater than the energy of the infrared Lir/2. Why is this happening?

Please refer to Figure 1C for a schematic diagram of the spectrum of day and night filters.

A day-and-night filter spectrum diagram as shown in FIG. 1C, wherein the ordinate is the percentage of transmittance T% and the abscissa is the wavelength (in nm).

In Fig. 1C, the day and night filter 14 allows both the visible light Lvi and the infrared Lir to pass. However, the passable infrared Lir is limited to a range having a center wavelength of 850 nm. That is to say, if an auxiliary infrared light source radiates infrared from a large energy such as 700 nm to 1,100 nm, after passing through the day and night filter 14, only the center wavelength is 850 nm (850 nm ± 20). Effective filtering (passing), the rest is wasted because it cannot be effectively sensed. Therefore, the infrared light radiated by this auxiliary infrared light source has a large range from 700 nm to 1,100 nm, which is similar to the range of the center wavelength of 850 nm.

Because of the infrared source with a center wavelength of 850 nm (about ± 20 nm), the radiation is often accompanied by a red glow called red storm. Therefore, an infrared light source having a center wavelength of 940 nm can also be used instead. However, it should be noted that the filter with a center wavelength of 850 nm can not be taken as shown in Fig. 1C, but the filter with a center wavelength of 940 nm should be changed. Otherwise, as shown in Fig. 1B, there is energy loss, which affects the image quality.

Looking at the website of Digi-Key, an internationally renowned electronic component agent, we can see that there are various types of infrared light source IR-LEDs with different specifications. The radiation center wavelengths are 850nm, 880nm, 920nm, 940nm and so on. The day and night filter that it is equipped with needs to be adapted to it. The infrared light source is matched, otherwise, the imaging efficiency is not good.

However, as can be seen from FIG. 1B and C, the incident light passing through the day and night filter 14 is in the range of 400 to 700 nm (visible light) and in the region of 850 nm ± 20 (infrared), which is a mobile image sensor. The light transmission area of 13.

How to identify whether this is a day or night filter?

This can be tested by an infrared remote control using a home TV set. After pressing the button of the infrared remote control, the camera lens of the mobile phone is illuminated. At this time, if a large piece is seen on the liquid crystal screen (LCD) of the mobile phone. The transition exposure area indicates that there is a large proportion of transmission through the infrared; on the contrary, if only a small point of transition exposure point is seen, the ratio of transmission through the infrared is relatively small.

At present, in the photographic security industry, higher-end Day & Night Cameras are mostly equipped with an electric double filter switching device, which can be selected to let the infrared pass or cut off after power-on.

This electric double filter switches the "electric" automatic sensing method. The main function of the automatic sensing mode is to sense whether the ambient illumination is greater than a preset value (for example, 10 Lux) by a light sensor. If so, an infrared cut filter is automatically cut in front of the image sensor to filter the incident light to remove the infrared portion, so that the remaining visible light enters to capture the true color. If not, automatically cut a normal transparent glass sheet (while removing the infrared cut filter) in front of the image sensor, so that the incident incident light includes both infrared and visible light, depending on the infrared and visible light. The size of the image can be captured into visible light or a mixture of infrared or visible light and infrared.

If the device for switching the electric double filter is to be placed in front of the mobile phone image sensor, the volume (including the drive motor and the drive structure) should not be too large. Otherwise, the mobile phone user is not carrying Will. In the future, if you want to switch the filter function, the design of the volume structure must be short and the structure should be simpler.

At present, the switching method of the double filter switching device, whether it is an electromagnetic force driving or a small DC motor driving method, often has a lack of double filter switching. For example, a transparent glass sheet and a filter that blocks infrared transmission are incompletely switched, so that a part of the transparent glass or a part of the ICF is simultaneously overlapped to appear on the image sensor, so that the sensing The output image frame forms two distinct regions that directly affect the image quality.

At present, a mobile phone with a photographic function, an ICF installed in front of the image sensor, can not be separated by a percentage of infrared, and some will leak a small part of the infrared. In most cases, for example, when most of the visible light [passes over] this small portion of the infrared, the image does not show redness, so this small portion of the infrared can be ignored. At present, the [Xi Zhai] mobile phone, which is famous for its famous international brand name, affects the image quality by using rough ICF to save cost.

A digital camcorder with infrared night vision (Night Vision) is common in the Japanese Sony model DSC-F707. When it is cut into the night lightless shooting mode, there are two functions for the operator to manually operate: one of the NightShot functions is manually removed by the operator with a filter with infrared cutoff (similar to ICF), supplemented by an infrared light source. Radiation.

Another Night Framing function uses an image sensor that simultaneously senses visible and infrared wavelengths, similar to the aforementioned day and night filter 14.

It is a pity that some unscrupulous users use the swimming device with infrared penetrating nylon cloth to perform [sneak shots] on women, causing the product DSC-F707 to be taken off the shelf.

In addition to its own image sensor, the DSC-F707 is also indispensable for infrared band sensing with a suitable infrared filter. For example Hoya R72, RM90; B+W 092, 093; Kaya PF2, PF4; Kodak Wratten 87, 87C, etc. These filters differ mainly in the proportion of visible light that can pass.

Currently commercially available optical low pass filters have allowed partial, relatively large amounts of infrared transmission, such as D70/D70s from Nikon made in Japan to the later D50. Professional photographers use external filters on their cameras. For example, Hoya RM90 filters out wavelengths below 900 nm, and Hoya R72 and Wratten 89B filters out wavelengths below 720 nm. These professional filters (filters) are the necessary environment to manually lock this filter on the lens of the camera lens to capture the strange infrared photo (Infrared Photo). Therefore, as long as an additional infrared light source is added, an infrared image can be taken.

As can be seen from FIG. 1B and FIG. 1C, if an inappropriate filter and an inappropriate infrared light source are used, the LCD image on the mobile phone cannot display an appropriate infrared image or only display an infrared image of poor quality.

Filter products are mainly classified according to the spectral band, spectral characteristics, application characteristics and other methods.

Spectral band: ultraviolet (280nm~400nm) filter, visible light (400nm~700nm) filter, infrared (700nm~1,000nm) filter; spectral characteristics: band pass (only through the selected band range) Filter, cutoff (only cut through the selected range of wavelengths) filters, spectroscopic filters, reflective filters, etc.

Among them, the more important application characteristics are the spectral characteristics (as explained in the following examples). What is the difference between the filter ICF and the OLPF for the cut-off infrared (only the selected band range can be cut)?

Simply put, ICF is the control wavelength and OLPF is the control frequency.

The commonly known OLPF (Optic Low Pass Filter) optical low-pass filter is a filter with an IR Absorption Filter function. It is mainly used on higher-order image sensors because when the sensor is imaged in high-resolution images, it will be affected by the spatial frequency of different spatial frequencies, causing the influence of the so-called Moire Pattern. , the image will appear ghost or unusual stripes. By utilizing the birefringency effect of the OLPF quartz crystal structure, it is possible to eliminate the influence of moiré by imaging.

Due to the different orientation of the pinstripes, optical low-pass filter wafers with corresponding angles need to be eliminated, and because different models of CCD cameras and CMOS image sensors have different specifications, they are generated for different models and different directions. Interference noise, need to use different thickness, number of pieces, angle combination of OLPF design to enhance the image

The current optical low-pass filter OLPF is usually composed of several quartz plates stacked together, each of which has different optical functions, some with additional IR-cut, and some with additional AR anti-reflection (due to the refractive index of quartz) Different from air, reflection is generated on the interface to reduce the intensity of incident light. In order to reduce the loss of reflection, an anti-reflection AR film is coated on the other side of the low-pass filter OLPF to improve the transmittance and enhance the image. quality).

The optical low-pass filter OLPF commonly found on the market has a so-called two-piece type and is composed of two pieces of quartz. The three-piece is composed of a piece of glass and two pieces of quartz. Such glass is often coated with an IRcut film, and some of the glass has the function of IR Absorption Filter.

Because the optical low-pass filter OLPF involves quite a lot of technology in the patent protection stage, the quality of the optical low-pass filter OLPF is equal to the main key to directly determine the image quality. Many manufacturers do not want this information column. Strictly controlled for confidentiality.

The main function of the optical low-pass filter OLPF is to filter different incident light. The frequency wavelength optical signal is transmitted to the CCD, and the different frequency signals are prevented from interfering with the CCD to interpret the color. When the optical low-pass filter OLPF is composed of three to five glasses, one of them is called infrared absorption glass, which is used to absorb infrared light. It acts like an infrared filter to block the passage of infrared light.

It can be seen from FIG. 1B and FIG. 1C that the camera of the day and night filter can simultaneously “simultaneously sense” the wavelengths of visible light and infrared (400~1,000 nm).

This kind of "simultaneous sensing", if it is in the presence of both visible light and infrared, enters the incident light mixed by the image sensor inside the mobile phone, and may have three different situations: the first one is visible light. Greater than infrared; the second is visible light equal to infrared; and the third is visible light less than infrared

In the first case mentioned above, for example, when shooting in outdoor sunlight, a large number of visible light [covers] a small number of infrared rays, so that the infrared energy is reduced, and the image after entering the mobile phone image sensor is displayed on the LCD screen. As with only visible light images.

In the second case, visible light [about equal to] infrared, resulting in an image after entering the mobile phone image sensor, displaying an image of both visible light and infrared light on the LCD screen; the mixed image of the two is on the LCD screen. It shows a feeling that the human eye looks a bit like [overexposed] and the color of the image is not good.

This [overexposed] image seems to have lost the color of reality and lost the monochromatic high contrast level.

In the third case, for example, at night and with the aid of an infrared light source, the visible light is much smaller than the infrared light, so that the image entering the mobile phone image sensor only displays the infrared image on the LCD screen.

A camera using the above-mentioned day and night filter, if it is to be used as an infrared night vision function In time, it is obvious that in the third case, it is better to take conditions than [pure] infrared images. In other words, the infrared night vision function of the mobile phone can shoot more [pure] infrared images under the rich infrared light source.

What is the purpose of shooting compared to [pure] infrared images? Mainly used as infrared anti-counterfeiting identification function. This will be explained in the following embodiments.

In the third case above, the energy richness of the infrared source is proportional to the required power source. For an infrared source under the same conditions, the greater the power required, the longer the relative duration of the radiation; the smaller the required power, the shorter the energy of the relatively continuous radiation.

For the mobile phone itself, the greater the power required by the infrared source, the greater the energy radiated relative to it. But the shorter the time relative to the call. For mobile phone users, the number of people who need the [long-term call] function is more than the number of people who need the [night vision] function.

Because, after all, the mobile phone is used for the function of [call], the power supply in the mobile phone should be to maintain [long] talk time as a request. It is not allowed to sacrifice talk time due to night vision photography. Obviously, for mobile phone users, under the condition of [long-term call] that does not affect the demand, it is also a better choice for those who have additional demand [night vision photography] and other functions.

[Previous Patent M281197 Case Description]

For example, in the case of the former Republic of China New Patent Certificate No. M281197, the patent name is [switchable front attachment lens device for portable camera device], and its representative diagram is shown in Figure 2, Figure 2A and Figure 2B.

According to the disclosure of the M281197 manual and the contents of the illustration, there is obviously a problem to be improved: Please refer to Figure 2 for a schematic diagram of the creation of the previous patent M281197.

Please refer to Figure 2A for the second schematic of the previous patent M281197.

Problem 1: The power required to assist the infrared light source captured by [Night Vision] is provided by the mobile phone itself, which will seriously affect the reduction of relative talk time.

The specification of M281197 shown in Fig. 2 states that [the power supply for the infrared lamp (51) is provided by the power source in the mobile phone (10)].

In fact, the limited power supply in the mobile phone, in addition to the consumption of the LCD screen during photography, plus the consumption of the infrared light source used for [night vision] shooting, is currently used in the mobile phone built-in one voltage DC3.7V capacity 1,000mA lithium battery For the pool, if the talk time can be maintained for 8 hours as an example. If you use 1.5W infrared LED (about 3~8 meters visual distance) to consume 1,000mA/hour for the simple calculation of night vision light source, you can use almost less than one hour of night vision shooting. Make the phone unable to talk properly. Therefore, the power required to assist the infrared light source captured by [Night Vision] should not be provided by the mobile phone itself.

Question 2: The infrared light source that is assisted by [night vision] should not be controlled by its mobile phone, so as to avoid unnecessary interference and increase cost and maintenance cost due to control requirements. For example, the description of the fifth figure of the M281197 case describes that [the infrared lamp tube (51) is disposed in front of the additional device (50) of the present invention, and the power supply is from the mobile phone body (10), and the infrared light tube (51) is subjected to the The mobile phone controls, and the infrared lamp tube (51) can function after the attachment device (50) is combined with the mobile phone body (10).

In addition, as stated in the manual of M281197: [The infrared emitting light source has a reserved circuit that can be connected to the mobile phone (10) with the camera function of the main function], [the infrared light tube (51) is controlled by the mobile phone (10) ]....

Problem 3: The addition of too many relatively complicated structures in the attachment device increases the cost of the original mobile phone assembly and the possibility of easy failure.

The first diagram, the sixth diagram, and the seventh diagram of the M281197 case describe that [the switching mechanism (20) on the attachment device (50) is pivotally provided with a circular turntable (25), and the center of the turntable (25) is positioned to be positioned. (52) The pivot is fixed in the housing of the attachment (50).].

As shown in the first, sixth, and seventh figures of the M281197 case, [the additional optical lens mounting hole (21) provided with six different functions on the turntable (25)]; and the eleventh figure [The turntable (25) of the switching mechanism (20) is provided with a bump-like sensing structure (24) corresponding to the V-shaped positioning groove (22), and the turntable (20) of the attaching device (50) and the switching mechanism (20) a contact sensor (40) is disposed in the middle, and the sensor (40) has a plurality of contact switches (41). When the turntable (20) of the switching mechanism (20) is turned to a preset position, the switching mechanism ( 20) The bump-like sensing structure (24) on the turntable (25) will activate a specific switch (41) on the sensor (40). At this time, different switches (41) are activated to represent different additional optical lenses. effect].

In the practical application, the structure of the bump-like sensing structure (24), the inductor (40) and its plurality of contact switches (41) can be omitted.

Problem 4: Adding additional optical lenses with too many different functions at once will increase the complexity of the structure and use.

The M281197 specification refers to [the additional optical lens mounting hole (21) provided with six different functions on the turntable (25).].

In use, the turntable (25) does not have to be provided with an additional optical lens with six different functions, such as a positive refractive power lens (211) in which the function of macro zooming can be obtained. Usually, the software inside the mobile phone has a close-up. The function of zooming in.

In fact, adding software can save the size of the phone than adding hardware.

Question 5: Do not have electrical lines on the attached device and the electricity on the phone body The gas line is connected, so as not to affect the safety certification and maintenance of the phone body call. For example, the specification of M281197 states that [the sensor (40) additionally uses the electrical circuit (53) on the additional device (50) to be connected to the electrical circuit (13) on the mobile phone body (10), and the different switches (41) When it is touched, the signal will be transmitted back to the phone body (10)].

The M281197 specification refers to [the number of contact switches (41) on the inductor (40) and the bump-like sensing structure (24) on the switch mechanism (20) turntable (25)]. In actual use, it is not necessary to increase the signal (back to the mobile phone body (10) when the different switch (41) is touched, because the user only needs to manually rotate the turntable (25) to achieve this effect.

If the electrical circuit on the accessory is connected to the electrical line on the body of the mobile phone, it is difficult to pass the safety certification of the electromagnetic interference.

Question 6: The touch of the mobile phone (40) and the specific switch (41) sometimes cause looseness due to frequent movement of the user in a small space and is not easy to align and malfunction.

Question 7: Expose the deficiencies and improper attachments.

The specification of M281197 refers to [film plate glass 214 which is penetrated by infrared light and does not penetrate through visible light]; however, this block is not disclosed in the specification and drawings, etc. What is the use of the light-impermeable film flat glass 214] on its mobile phone body (10)? How to use it with the phone body (10)? What is the spectrum of the film? What kind of infrared light source is used?

How can a general general practitioner implement it without multiple experiments? It is not possible to mention only the terms [plating], [the layer through which infrared light penetrates and the visible light does not penetrate], and the terms that are conventionally known are included in the specification and are limited to the scope of patents of their subsidiary items. ?

From the above problems one to six, it is necessary to design a simple structure to solve The problem described.

From the above-mentioned problem 7, there is a lack of the necessary explanation [the plating of the plate glass plate 214 through which the infrared light is transmitted and the visible light does not penetrate] is related to the body of the mobile phone (10).

[Previous US Patent US2010/0128129A1 cited description]

According to US 2010/0128129 A1, a device (100) and method for acquiring an image is described. As described in the second page of the specification [0033] The apparatus 100 of an image may receive visible light and an infrared ray (IR) and generate a color image and a depth image: it is a visible image (VISIBLE LIGHT) to produce a color image ( Color image) and the reflected infrared (REFLECTED IR) to generate a deep image (Depth image).

The embodiment and description of the first embodiment illustrate that the incident visible light and the reflected infrared light pass through an optical lens (LENS 102) and then enter a filter assembly 110.

The filter assembly 110 is operated by an operating unit 130 to rotate a first filter (FILTER 1) and a second filter (FILTER 2), as shown in FIG.

The sensor unit 120 may pass the light passing through the filter set 110 under control of 110. The sensor unit 120 may pass the light passing through the filter set 110 under control of The control module 103, and provide an electric signal to a processor 104, AIso, the processor 104 may generate the color image using the electric signal. [0037] The filter set 110 may pass a reflected IR which was emitted by the IR LED 101 In a second operation mode. Sense the light passing through the filter set 110 under control of the control module 103, and provide an electric signal to a processor 104, Also, the processor 104 may generate the depth image using the electric signal: the filtered filter assembly 110 Incident on a light sensing unit (120), the light sensing unit (120) provides an electrical signal to the microcomputer 104 (Processor 104) by the sensed incident light, the microcomputer The processor 104 then uses the electronic signal to generate a color image or a deep image.

As shown in page 2 of the specification [0034] Alight emitting, forexample, an IR Light-Emitting Diode (LED) 101 may emit an IR under control of a control module 103, that is, an LED driver and sensor controller 103. The sensing action of the light sensing unit and the action of the infrared light emitted by the IR-LED 101 are controlled by a controller (LED DRIVER & SENSOR CONTROLLER 103).

To sum up, according to the US2010/0128129A1 application filed in November 2009, two key points are proposed here:

(1) The first filter (FILTER 1) and the second filter (FILTER 2) are rotated by a motor.

In the prior patent concerning the use of a motor to rotate a plurality of filters, there is a new type of anti-theft photography monitoring device of the electric dual-layer near-infrared filter type 191918, which was filed by the inventor Xie in May 2000. ], and the inventor Xie Mou applied for the Republic of China new patent No. M356920 [wide-angle mirror device with day and night surveillance photography function] which was applied in December 2007.

(2) The action of IR-LED 101 to emit infrared is controlled by a controller.

[Other new product case citations]

In this reference to other new product cases, two smart phones with night vision function are mentioned. These two cases were obtained when the inventor visited the 2010 International Mobile Phone New Product Presentation Conference at the time of writing the application for the present invention. For related information, a reference cited at the time of writing the application of the present invention is proposed.

In the first case, the SCH-W760 smart phone from Samsung in South Korea has night vision function. The main camera is 3 megapixels. The front camera has infrared sensing function. This function can adjust the aperture according to the light and darkness of the light to capture the darkness. The scenery in the middle, and can display the effect in black and white.

The second case is the first infrared night vision mobile phone in mainland China. This is the OBEE628 infrared night vision mobile phone launched by China Zhenhua Group in 2008.

In the above-mentioned two cases, the night vision function such as Samsung SCH-W760 and OBEE628, after being disassembled by the repairer, it was found that the day and night filter 14 as described above was built in.

If it is illuminated by the infrared remote control of a home TV set, it can be found that the infrared pens can be seen on the LCD screens of the Samsung SCH-W760 and OBEE628 mobile phones.

A single white LED flashlight of about 0.1W is used to illuminate the camera lens of the two mobile phones, and a single white light image is seen on the LCD screen of the mobile phone, indicating that the visible light is transparent. Then, the same camera lens of about 0.1W IR-LED flashlight is used to illuminate the camera lens of the mobile phone, and a single white light image is also seen on the LCD screen of the mobile phone, indicating that the infrared light is transparent.

When using IPF filter, the former is about 0.1W white LED flashlight When shooting a camera lens of a mobile phone, a single white light image will not be visible on the LCD screen of the mobile phone.

Also, when the IPF filter is used, if the former 0.1W white LED is changed to a 10W white LED, and the original flashlight is used to illuminate the camera lens of the mobile phone, the LCD screen of the mobile phone should still not be visible. Point white light image; if you still see a single white light image, it means that this IPF filter is not a percentage of valid cut-off visible light.

According to the test, in the above-mentioned two night vision functions of Samsung SCH-W760 and OBEE628, filters or films which can pass visible light and infrared light at the same time are used.

Moreover, according to the catalogue data of the above-mentioned two cases of night vision function phones or other types of mobile phones, no IPF filter was found.

Obviously, the device IPF filter seems to have no obvious use for the above two cases of night vision function phones or other types of mobile phones. In the night vision function phone, the IPF is discarded, and with the infrared light source, the infrared night vision function is also available. Obviously, there is no need to add an IPF filter. Unless you add an IPF filter, you can combine functions other than infrared night vision.

In other words, what are the functions and uses of the IPF filter installed in the above two cases of night vision function phones or other types of mobile phones? At present, there is no patent and product information to confirm the role and use of IPF filters in these mobile devices.

In the following embodiments, how does the mobile phone of the present invention match an IPF filter? What is the use after the match? ! Why do you need to modulate the intensity of infrared radiation?

Please refer to FIG. 3 for a schematic diagram of an exception hanging device according to the present invention.

As shown in FIG. 3, the portable device of the mobile phone 10 having the photographic function includes: the switchable infrared of the first device is a dual filter set 20 that passes or passes, and the infrared of the second device The modulation module 30 and the support 40 of the third device are used to support the first device and the second device.

FIG. 4 is a schematic diagram of a combination of an exception hanging device according to the present invention; FIG. 4A is a schematic diagram 2 of an exemplary accessory device according to the present invention; FIG.

4 and FIG. 3 both include: the switchable infrared of the first device is a dual filter set 20 that is cut off or passed, the infrared modulation module 30 of the second device, and the support 40 of the third device are used to support the A device and a second device.

As shown in FIG. 4A, a mobile phone charging plug 50 is further included (the other end includes an AC power supply of 100 to 240 V input terminals not shown), and when the mobile phone 10 is inserted into the support base 40, the mobile phone 10 can be charged by the charging plug 11.

As shown in FIG. 4A, the support base 40 includes two stop points 40a for supporting the mobile phone 10. When the mobile phone 10 is inserted into the support base 40 for charging, a space is reserved between the two stop points 40a for charging. The plug 50, as shown in the space 41 (shown by the double arrow symbol), allows the handset 10 to remain "standing" when inserted into the charging device as shown. Otherwise, when the mobile phone 10 is charged with the charging plug 50, if the mobile phone 10 is often "crossed" by the AC power socket on the ground, it is easily stepped on by others.

As shown in FIG. 4 to FIG. 4B and the foregoing FIG. 3, the external device (the infrared modulation module 30, the dual filter group 20, and the support base 40) of the mobile phone 10 of the present invention can be separated from or combined with the mobile phone 10. Together.

Moreover, each of the external devices can be freely separated or combined.

Please refer to FIG. 5 for a schematic diagram of an auxiliary infrared imaging method according to an embodiment of the present invention.

A method of providing assisted infrared imaging as disclosed in FIG. 5 includes:

(1) The operator manually turns on the modulated infrared modulation module 30 to cause the infrared modulation module 30 to radiate the infrared Lir.

(2) Modulating the VR of the infrared modulation module 30, so that the infrared modulation module 30 can radiate infrared Lir of a certain intensity.

(3) The radiated infrared Lir is projected on the object A, and the environment in which the object A is located may include visible light Lvi and infrared Lir. When the incident light of the mixed light Lvi and the infrared Lir reaches the double filter set 20 which can switch the infrared cutoff or pass, if the double filter set 20 is switched to the IPF filter, only the infrared Lir can enter the mobile phone 10. Imaging allows for clear, high-contrast infrared images on the LCD screen of these handsets 10.

This infrared image contains almost no visible color image (blocked by IPF filter), which can be said to be a "pure" infrared image. Please refer to the description shown in Figure 9 for details. As shown in Figure 5, if the dual filter set 20 is switched to the IPF filter and there is no Lir, then Lvi is far larger than Lir but the Lvi cannot pass the IPF filter, which makes the LCD screen of these mobile phones 10 invisible. Any image (visible and infrared).

In FIG. 5, if the infrared modulation module 30 is turned off and there is no infrared radiation, if there is enough infrared Lir radiation source in the environment where the object A is located, the LCD screen of the mobile phone 10 can also see clear high contrast. Infrared image.

For example, in the outdoor sun during the day, because about 45% of the sunlight is in the infrared range. The infrared in the sunlight is much stronger than the Lir radiated by the infrared modulation module 30. The power required for the infrared modulation module 30 to be turned on in FIG. 5 is provided by the infrared modulation module 30, and is independent of the power supply of the mobile phone, as illustrated in FIG.

As can be seen from Figure 5, in the environment with sufficient infrared radiation source radiation, these mobile phones 10 can capture monochrome infrared images during day or night.

Moreover, as shown in FIG. 5, when the dual filter set 20 is switched to the ICF filter, only the visible light Lvi can enter the image of the mobile phone 10, so that the actual (almost no infrared) color can be seen on the LCD screen of the mobile phones 10. An image of the industry (called True Color). This is the same as the shooting function of a typical camera phone.

Moreover, as shown in FIG. 5, the mobile phone 10 of the embodiment of the present invention is different from the general mobile phone with a camera. The inside of the mobile phone 10 of the present invention is not provided between the internal image capturing lens and the image sensor. There is a cut-off filter that blocks infrared entry, otherwise the infrared cannot enter the image sensor for imaging.

However, if there is a day/night filter between the lens for capturing the image and the image sensor as shown in FIG. 1, the infrared and visible light are both under the radiation of a sufficient matching infrared radiation source. Both can also enter the image sensor imaging, and the mixed infrared and visible light will produce the aforementioned non-"pure" infrared or "pure" visible light.

In order to obtain "pure" infrared or "pure" visible light, it is necessary to perform the switching operation of the dual filter set 20.

The object of the present invention is to provide an external device for a mobile phone, which can be separated or combined with each other between the mobile phone and the external device to achieve the user's simple and flexible use.

Another object of the present invention is to provide an external device for a mobile phone, so that the external device has the power required by the device body, and does not directly use the power source in the mobile phone body, so as to reduce the call time of the mobile phone and reduce the failure due to sharing. The incidence.

It is still another object of the present invention to provide a color image of a mobile phone that can capture a simple infrared image or a simple (true color) image.

A further object of the present invention is to provide a method for manually modulating the radiation intensity of an infrared light source, so that when the mobile phone captures an infrared image, a high-contrast image with a high distance can be captured at an appropriate distance.

It is still another object of the present invention to provide a support base 40 for supporting a dual filter set 20 and an infrared modulation module 30; and for enabling the mobile phone to perform charging work in a standing condition.

In order to achieve the above object, the external device of the present invention has two technical solutions:

(1) Using the switchable infrared cut-off or pass-through dual filter set 20 of the external device to manually switch the infrared cut-off ICF or switch the infrared filter IPF or the like to the double filter set 20.

(2) Using the infrared modulation module 30 of the external device to control the intensity of the infrared radiation by manual modulation.

(3) using a support base 40 of the external device to support the dual filter set 20 and the infrared modulation module 30; and freely separating and combining the mobile phone 10 and the dual filter set 20 and the infrared modulation module 30 Moreover, the mobile phone 10 can be charged in a standing condition.

FIG. 6 is a schematic diagram 1 of a dual filter set according to an embodiment of the present invention; FIG. 6A is a schematic diagram 2 of a dual filter set according to an embodiment of the present invention.

As shown in Fig. 6, the incident light containing the visible light Lvi and the infrared Lir can only be used to image the visible light Lvi by entering the image sensor when the double filter set 20 window passes through the infrared cut filter ICF.

As shown in Figure 6A, the visible light Lvi of the incident light L and the infrared Lir, in the double filter set 20 window When the mouth passes through the infrared filter IPF, only the infrared Lir can pass through (block the visible light Lvi) into the image sensor.

6B is a schematic diagram of a spectrum of an ICF filter set (FIG. 6) according to an embodiment of the present invention; FIG. 6C is a schematic diagram of a spectrum of an IPF filter set (FIG. 6A) according to an embodiment of the present invention.

As shown in Figures 6B and C, the ordinate is the percentage of penetration (T%) and the abscissa is the wavelength (in nm).

As shown in Figure 6B, the ICF can penetrate more than 90% of the visible range from 400 nm to 700 nm.

As shown in Figure 6C, the IPF can penetrate more than 90% of the infrared (or near-infrared) range from 700 nm to 1000 nm.

In this way, only one of the visible light Lvi and the infrared light Li can be passed through the incident light L to enter the mobile phone 10 for imaging.

Please refer to FIG. 7 for a schematic structural view of a dual filter set according to an embodiment of the present invention.

As shown in FIG. 7, the dual filter set 20 includes an empty casing 21, a pair of filter templates 22, and a stop 23. The empty casing 21 includes three notches, such as a circular hole 21a, an elongated sliding groove 21b, and a rectangular groove 21c.

The notch of the circular hole 21a is aligned with the photographic lens of the mobile phone 10, so that the incident light passes through the circular hole 21a before entering the photographic lens of the mobile phone 10.

The elongated chute 21b is for the user to push the pusher plate 22a into the empty casing 21 and then fit into the retaining post 23. Its elongated range is a range of limited distances that the user can push the pusher plate 22a with his fingers.

Here, the limit distance range is at least: when any one of the ICF and the IPF can be moved to both ends of the limit distance, any one of the ICF and the IPF can be correctly moved to the notch of the circular hole 21a. After the incident light enters the notch of the circular hole 21a, it must pass through either the ICF and the IPF to enter the lens 10a of the mobile phone 10 for imaging.

Among them, the rectangular groove 21c is used for the button on the mobile phone 10 to free up its desired position.

The double filter template 22 further includes a shifting plate 22a and a pair of double circular orifices 22b.

A double filter such as an ICF and an IPF is adhered to the two circular holes of the double circular hole piece 22b.

Because the visible light and infrared imaging have different focal points, generally the infrared focus is behind the visible light. In order to reduce the defocus phenomenon, in this embodiment, the ICF lens thickness is made 0.5 mm and the IPF lens thickness is made into 0.4 mm different thickness. Reduce the optical path difference, the test results are not obvious.

The size range of both the circular hole 21a and the double circular hole piece 22b should be consistent with the size range of the photographic lens of the mobile phone 10; otherwise, if it is too large, the volume of the empty casing 21 is affected, and if it is too small, the incident light entering position and the amount of light entering are affected.

The stopper 23 prevents the double filter template 22 from being pushed out of the elongated chute 21b when the pusher plate 22a pushed by the user with the finger moves on the elongated chute 21b.

When the double filter template 22 is adhered to an ICF and IPF double filter, it can be placed into the elongated chute 21b and then inserted into the retaining post 23 to prevent the double filter template 22 from being pushed out of the elongated chute 21b.

Please refer to FIG. 7A for a schematic diagram of the dual filter set 20 and the mobile phone 10; see FIG. 7B for the dual filter set 20 and the mobile phone 10.

As shown in Fig. 7A, the circular aperture 21a of the double filter set 20 needs to be aligned with the lens 10a of the mobile phone 10, so that the incident light passes through the circular aperture 21a and then passes through the photographic lens 10a to enter the imaging.

The size of the double circular orifice piece 22b should not be too large, otherwise the volume of the empty casing 21 is affected. It should not be too small or it will affect the incident light entering position and the amount of incoming light. It should be noted that when the user pushes the shifting plate 22a with a finger, one of the two pieces of ICF or IPF should be aligned with the circular hole 21a, and if one of the two pieces is displaced to the mobile phone 10 image sensing Directly in front of the device, a color image with a portion of visible light or a monochrome image with infrared light is generated, so that the user can easily adjust the push plate 22a with a finger.

The smart phone 10 used in this embodiment has a camera of different sizes on the front and rear sides of the mobile phone 10. One of the cameras 10b with a smaller pixel size (for example, 2M Pixel) is disposed on the same side as the LCD (as shown in FIG. 7B), and the user's self-photograph can be uploaded to the network; the other is larger. A higher (e.g., 5M Pixel) camera 10a is disposed on the other side (Fig. 7A) for providing a user with a mobile phone for photographing.

As shown in Fig. 7A, the circular aperture 21a of the double filter set 20 needs to be aligned with the lens photographed by the mobile phone 10, so that the incident light passes through the circular aperture 21a and then passes through the photographic lens to enter the shooting operation.

In the embodiment, the dual filter set 20 of the mobile phone 10 of the present invention is externally attached to the outside of the mobile phone 10, which is determined for the aftermarket mobile phone. In the future, if it is mass production, it can be considered to be designed inside the mobile phone 10.

That is to say, during the processing and assembly process of the mobile phone 10, the dual filter set 20 is disposed between the image sensor inside the mobile phone 10 and the photographic lens, and the double filter set is hardly seen from the outside of the mobile phone 10. 20, only a small exposed handle (similar to the shifting plate 22a of Figure 7) can be seen.

As described in the foregoing FIG. 6 to FIG. 7 , the IPF of the dual filter set 20 mainly allows the infrared image to enter the image sensor in the mobile phone 10 to sense the image, so that the mobile phone 10 can capture a relatively "pure" image. Infrared image.

Why does the phone 10 need to capture a purer infrared image?

As we know from optical physics, the speed of light is fixed. The speed is the same whether infrared or white light, where the speed of light = wavelength × frequency (C = λ * f). Seen in the electromagnetic spectrum: because the infrared wavelength is longer, the frequency is lower. The refractive index is related to the frequency, because the angle of refraction of the light-diffusing medium into the optically dense medium will be different.

The infrared wavelength is longer, so the frequency is lower, the angle of refraction is smaller, and the infrared penetrating power is relatively strong. For example, infrared can penetrate some thin materials that are not transparent to visible light, such as chemical fiber cloth, plastic, and tinted glass.

Since the contrast of the infrared image is relatively bright, it has a particularly bright visual effect. For an object to be observed that can reflect a large amount of infrared light, the reflected infrared image is more apparent than the visible image.

For example, infrared is particularly sensitive to carbon, and can detect weak ink lines, infrared inks that are made by adding infrared-absorbing substances to an ink, because infrared inks absorb infrared rays, such as in some parts of printed products. The ink does not react in daylight, but under infrared illumination, the corresponding signal or dark image can be observed.

However, for infrared non-absorbed objects to be observed, for example, a red pattern of paper, a red pattern can be seen under white light, but under infrared illumination, only a blank sheet of paper is seen and no red color is seen. picture of.

Obviously, infrared also exhibits different absorption characteristics for different objects to be observed. That is to say, if the object to be observed is illuminated by white light, the corresponding color pattern and text can be observed. If under infrared illumination, some of the objects to be observed can observe the corresponding monochrome pattern and text, and some objects to be observed do not observe anything.

In addition, infrared has a relatively strong penetrating power with respect to white light. For example, forensic experts use infrared to penetrate the surface of the picture into the interior of the paint to identify the authenticity of the masters' famous paintings.

Some substances to be observed generate a kind of fluorescence in the infrared region by means of excitation of blue light, green light or ultraviolet light, which is generally referred to as infrared fluorescence photography.

Because infrared images can provide picture information that is not available in visible light, infrared monochromatic images can also bring a contrasting layer effect that is completely different from black and white images (B & W). This is also one of the most different characteristics of infrared and visible light.

If an incident source of infrared and visible light is used, the infrared contrast will make the infrared characteristic appear "not obvious" due to the interference of visible light [blur]. The image quality of the recognition becomes [very] poor, so that its infrared anti-counterfeiting function is greatly reduced, as explained in the embodiment.

The mobile phone 10 of the present embodiment utilizes a simple infrared shooting function, in addition to communication (calling), and can also play the function of infrared night vision (Night Vision) and anti-counterfeiting identification of infrared instruments.

The mobile phone 10 takes a photo at night (photo) using a flash, but the mobile phone 10 is recorded at night (video) in two ways: (1) shooting a color image with a white light, or (2) using an infrared light (a light source). ) Projecting a monochrome image.

The infrared photographing function of the mobile phone 10 of the present invention mainly provides police public security personnel to conduct case investigation, infrared documents for anti-counterfeiting identification, and students to observe night-shaped ecology (such as insects) at night. The preferred method as described above employs infrared (mixed with visible light).

The infrared shooting function of the mobile phone 10 relies on the assistance of the infrared light source, whether it is the artificial assistance at night or the infrared radiation contained in the natural environment during the day (such as sunlight), which is reflected by the object and then enters the image sensor of the mobile phone 10 for imaging. .

The auxiliary infrared light source on which the infrared imaging function of the mobile phone 10 of the present invention is based is derived from the infrared modulation module 30.

Please refer to FIG. 8 , which is a schematic diagram of the infrared modulation module 30; FIG. 8A is a schematic diagram 2 of the infrared modulation module 30.

FIG. 8 includes a housing 30a, an IR-LED (Infrared LED) infrared light emitting diode, a power switch SW, and a half fixed resistor VR.

The housing 30a is provided with three one-watt IR-LEDs which are mainly infrared light sources having a radiation power of about 3 W (1 W*3) whose center wavelength is 850 nm or 940 nm.

A power switch SW is disposed on the front side of the housing 30a for enabling or disabling the power of the IR-LED.

A half of the fixed resistor VR is disposed on the front panel end of the housing 30a for adjusting the PWM signal width ratio to control the radiation intensity of the IR-LED.

As shown in FIG. 8A, there are two input/output interfaces (30b, 30d) and three small LED indicators 30c; wherein, the power output 埠30b means that the infrared modulation module 30 is a discharge output, and can output about 4.7V~5V. DC. The 30d charging interface is input with DC5V1A power.

Among them, three small LED indicators 30c indicate [charging], [low power Quantity] and the status of [High Battery]. When the battery is lowered, the 3.2V [Low Battery] light is on, and when the battery is full, the 4.7V [High Battery] light is on. The LED indicator light 30c is instructed by a conventional battery management IC circuit signal output.

The infrared modulation module 30 includes a modulatable method and an infrared light source group.

The modulatable method refers to the infrared intensity that can be modulated by the modulating IR-LED. For example, in this embodiment, a modulation method controlled by a PWM signal is used.

An infrared light source group refers to a radiation source that can radiate infrared light. For example, in this embodiment, an IR-LED having a center wavelength of 850 nm or 940 nm is used.

In other words, the IR-LED, which can modulate the infrared intensity in the infrared modulation module 30, can be used to modulate the IR-LED.

Because the intensity of the radiation is inversely proportional to the square of the distance radiated; the width of the radiation is related to the distance radiated, and the wider the radiation, the relatively effective distance of the radiation.

For example, a distance of 5 meters from the distance requires an IR-LED radiation power of 1.5W. However, the recognition of the desktop infrared anti-counterfeiting instrument by a distance of 5 cm is not clear because of the intensity of the radiation [too strong] and the over-contrast image range of the cover.

That is to say, it is necessary to adjust the anti-counterfeiting documents during close-up daytime to adjust the intensity, and sometimes to increase the contrast of the identification, it is necessary to gradually increase its strength and weakness.

For another example, if the butterfly larva on the leaves in the cofferdam is observed at about 1 meter at night, the radiation intensity should be properly modulated until the subject can be seen clearly.

Because IR-LEDs consume less power at the same power than other infrared sources (such as halogen lamps). A central wavelength of 850 nm or 940 nm can be used.

As for how the infrared modulation module 30 can modulate the intensity of the infrared radiation. The intensity of the radiation radiated by the infrared source is mostly controlled by the current or voltage of the IR-LED. At present, there are many conventional control ICs and templates for sale. Unless otherwise stated, this embodiment uses a PWM (pulse width modulation) method combined with a variable resistor VR to adjust its pulse width, and controls the proportional pulse width signal ratio. To modulate the brightness of the IR-LED.

In fact, there are currently many well-known LED control brightness application circuits and kits for sale. The simplest one is to use a variable resistor, which is inefficient. However, the majority is a method of pulse width modulation PWM dimming. Others such as a microprocessor MCU or an operational amplifier OP can also be applied to generate a PWM circuit.

In the PWM circuit, a variable resistor (commonly with a circular or linear shift) VR is used to adjust the impedance value to adjust the PWM turn-on time ratio. For example, at certain frequencies greater than 200 Hz, the LED power is turned on and off at a different percentage of on-time (duty cycle) from 0% to 100%. The LED operates at full current during turn-on and no current flows through the LED during turn-off. Another method is to control the amount of current flowing through the LED string. This can cause the voltage of the LED string to drop.

Therefore, it can be seen that the LED is a light-emitting element that is very easy to change its brightness, and can be dimmed by inputting a pulse width modulation (PWM) signal.

L, L1, L2‧‧‧ incident light

Lvi‧‧ Visible light

Lir, Lir/1, Lir/2, Lir/3, Lir/4‧‧‧ Infrared

IR-LED (Infrared LED)‧‧‧Infrared LED

ICF‧‧‧Infrared cut filter

IPF‧‧‧Infrared filter

SW‧‧‧Power switch

VR‧‧‧ semi-fixed resistor

10‧‧‧Mobile phones

10a‧‧‧ camera

10b‧‧‧ camera

11‧‧‧Protective clear glass

12‧‧‧Infrared cut filter

13‧‧‧Image sensor

14‧‧‧Day and Night Filters

20‧‧‧Double filter set

21‧‧‧ empty shell

21a‧‧‧ round hole

21b‧‧‧Slim chute

21c‧‧‧ rectangular trough

22‧‧‧Double filter template

22a‧‧‧Move board

22b‧‧‧Double round hole piece

23‧‧ ‧ blocking column

30‧‧‧Infrared modulation module

30a‧‧‧shell

30b‧‧‧Power output埠

30c‧‧‧Three small LED indicators

30d‧‧‧discharge output埠

40‧‧‧Support

40a‧‧‧

41‧‧‧ Space

50‧‧‧Mobile phone charging plug

90‧‧‧Black box

91‧‧‧Insects

Infrared image of 91a‧‧ insects

Figure 1 is a cut-off diagram of the infrared cut filter

Figure 1A is a schematic diagram of the cut-off infrared spectrum of blue glass

Figure 1B is a schematic diagram of day and night filter imaging

Figure 1C is a schematic diagram of the spectrum of the day and night filter

Figure 2 is a schematic diagram of the creation of the previous patent M281197.

Figure 2A is a schematic diagram of the creation of the previous patent M281197

Figure 2B is a schematic diagram of the creation of the previous patent M281197

FIG. 3 is a schematic diagram of an exception hanging device according to the present invention

Figure 4 is a schematic diagram 1 of the combination of the special hanging device of the present invention

FIG. 4A is a schematic diagram of the combination of the exception hanging device according to the present invention.

FIG. 4B is a schematic diagram 3 of the combination of the special hanging device of the present invention

FIG. 5 is a schematic diagram of an auxiliary infrared imaging method according to an embodiment of the present invention

FIG. 6 is a schematic diagram of a dual filter set according to an embodiment of the present invention;

FIG. 6A is a schematic diagram of a double filter set according to an embodiment of the present invention

FIG. 6B is a schematic diagram of the spectrum of an ICF double filter set according to an embodiment of the present invention;

Figure 6C is a schematic diagram of the spectrum of an IPF double filter set according to an embodiment of the present invention

FIG. 7 is a schematic structural diagram of an ICF double filter set according to an embodiment of the present invention;

Figure 7A is a schematic diagram of the composition of the dual filter set 20 and the mobile phone 10.

Figure 7B shows the composition of the dual filter set 20 and the mobile phone 10

Figure 8 is a schematic diagram of the composition of the infrared modulation module 30

Figure 8A is a schematic diagram of the infrared modulation module 30

Figure 9 is a schematic view of the nighttime activity of insects observed during the day in this embodiment.

[1], providing and making components:

As shown in FIG. 4, the structure of the present invention comprises a mobile phone 10, a dual filter set 20, an infrared modulation module 30, and a support base 40.

(1) If the mobile phone 10 is equipped with a ready-made mobile phone, it must be modified to remove the ICF first or “not set” the ICF, a glass filter or film that blocks infrared access during the production process. Otherwise, the infrared cannot enter the image sensor. . For example, a general mobile phone using a day and night filter can also be used.

(2) The double filter set 20 is produced, and the double filter set 20 has two methods: the first one is an external type and the second type is a built-in type. In this embodiment, an external double filter set 20 is adopted, as shown in FIG. 3, FIG. 4, and FIG.

(3) Making the infrared modulation module 30 as shown in FIG. 8 and making the infrared modulation module 30 The direction of the infrared radiation should be set to the same direction as the image taken by the lens of the mobile phone 10 (see Figure 4B, Figure 9).

The length of the casing 30a should be [short] than the length of the mobile phone 10 to the photographic lens of the mobile phone 10 (see FIG. 4B).

Wherein, a rechargeable battery is disposed inside the casing 30a, and a 3.7V lithium battery is used, which is 4.2V when fully charged. The side is provided with a power management IC control board that is commonly used.

The position where the IR-LED is radiated should be as close as possible to the front end of the casing 30a and close to the photographic lens of the mobile phone 10, so that the direction of the radiation is as close as possible to the direction of the image taken by the lens of the mobile phone 10, so that the radiated infrared radiation is made. A "larger" amount of reflection is obtained after being photographed.

The IR-LED uses a 1W high power Infrared Illminator from OSRAM Opyo Semiconductors.

The arrangement of a power switch SW and a half of the fixed resistor VR should not interfere with the operation of the user, and should not interfere with the action of inserting the support 40.

(4) A support base 40 is made, and in order to reduce the weight, a simple mechanism is mainly molded by plastic molding. Because it is necessary to place the infrared modulation module 30 group and a mobile phone 10 on both sides of the space of the support base 40, it is preferable to select a slightly elastic material.

The elastic design of the support base 40 should allow an infrared modulation module 30 and a mobile phone 10 to form an easy-to-separate "separate disassembly" and "recombination" functions, as shown in Figs. 4, 4A, and 4B.

[2], the first embodiment:

(Dimethyl) Shooting visible light images during the day: for example, a travel or birthday party, and only want to take a color image of daily life records, it is not necessary to use the infrared modulation module 30. However, it is necessary to note whether the dual filter set 20 has been switched to an ICF for visible light entry, otherwise the visible light cannot penetrate the IPF imaging.

(2) Shooting infrared light images during the daytime sunshine: During the daytime travel in the wild, for beautiful landscape trees, in addition to the color image of visible light, if you want to capture a strange infrared image, switch the dual filter set 20 to one. IPF filter, this strange infrared image is formed by monochromatic high contrast infrared photos or video. At this time, it is not necessary to use the infrared modulation module 30. Because the infrared in the daytime sunlight accounts for about 45% of the incident light, it can be said that it is like a separate one. The infrared source of the fee.

(2) Identification of infrared forgery documents: This mobile phone 10 should recognize infrared forgery documents, regardless of day or night, whether in the laboratory or on the table, readily identifiable. When performing the identification work, the dual filter set 20 is switched to an IPF filter, and the infrared modulation module 30 is required to modulate the intensity of the infrared.

Ways to identify infrared instruments:

(a) Try to identify an infrared file to be identified:

(a1) A sample of the infrared file to be identified is printed using the digital halftoning technique currently popular in the printing industry. The traditional printing technology, because printing or printer printing images can only control the presence or absence of ink dots, can not express the continuous color of the image, you need to adjust the different shapes and different sizes of ink dots through halftone technology to indirectly simulate The continuous tone level is such that when the printed image is viewed at a certain distance, the human eye observes the integral and the average value of the adjacent ink dots, so that the output images of the two different stages of color tone appear to have a continuous color tone. With the rapid calculation of computer technology and the emergence of high-resolution printers, this printing technology has become popular in the modern printing industry. In order to save the cost of implementing the test, this embodiment has to manually create a simple infrared file to be identified from the existing materials.

(a2) Powerpoint on the personal computer, type [infrared file] and other words. Among them, [red] is drawn in red, [outside] is drawn in blue, [] is drawn in black, [text] is drawn in yellow, and [piece] is drawn in green.

Then, a sheet of paper printed with [infrared document] five-color characters is printed by an inkjet printer.

Again, Powerpoint on the personal computer, type [to be identified] and other words. Then, put this paper with the [infrared file] five-color word into another laser black-and-white printer and print it again. Finally, get a cumulatively printed [infrared file to be recognized] eight-character five-color paper.

These eight characters are [infrared files to be identified], and the five colors are red, blue, black, yellow, green, and other five colors and one black carbon black paper.

The black ink K among the basic 4-color inks of CMYK generally used for commercial printing is a black pigment mainly composed of carbon black, and the black pigment exhibits absorption from the ultraviolet region to the entire region of the infrared region. Usually in the market, there is a safety record that can exert the specific qualities that do not absorb infrared. Recorded material, but the CMY3 color overlaps in the basic 4 colors, and the human visual looks black, but this "black" does not absorb infrared. When the mobile phone 10 is cut into the IPF and the appropriate infrared radiation is modulated to observe, the image printed with the black ink K containing carbon black can be seen.

In other words, when you use the mobile phone 10 to see only the words [to be recognized], you can't see the words [infrared files].

The above (a2) example is only an experiment of the embodiment of the mobile phone 10. Really valuable documents, etc. are of course not so simple, and some include new technologies such as ultraviolet light, various types of phosphors, lasers, and so on. However, this is indeed a good teaching material for school teaching experiments, especially for the Department of Optoelectronics and Art.

(b) Infrared detection observation:

(b1) Taking (a2) as an example, the ink jet printer prints out CMYK four-color inks (also six-color inks) whose color is mostly transparent. These formed ink prints are [transparent] to the infrared, and they absorb infrared results. The LCD screen of the mobile phone 10 is not easy or does not see the words [infrared file].

The laser black and white printer uses black toner, and the black toner is [opaque] for infrared. They do not absorb infrared results. It is easy to see the words [to be recognized] on the LCD screen of this mobile phone 10.

When the dual filter set 20 is cut into the ICF, if the intensity of the infrared radiation radiated by the infrared modulation module 30 is insufficient, the LCD screen of the mobile phone 10 will be "faintly" or see a light color [infrared file] due to the intervention of visible light. Wait for the words.

This is one of the reasons why a single "pure" infrared is needed.

Therefore, when the dual filter set 20 of the mobile phone 10 is used for infrared identification work, the intervening visible light can be blocked when cutting into the IPF, which makes the identification clearer.

Otherwise, increase the intensity of the infrared radiation so that the infrared "covers" the visible light, which also makes the identification clearer.

At present, there are a variety of infrared excitation inks on the market, and the infrared-activated ink prints can exhibit visible ink ink prints after being irradiated by infrared rays of 940 nm to 1,000 nm. For example, the anti-counterfeiting design of NT$1000 banknotes in China, some of the infrared inks used for printing can reflect infrared light in addition to ordinary visible light. The “two children” are not printed with this infrared ink, so they cannot see it. !

Generally inorganic or organic compounds. By appropriately adjusting the appropriate ratio of the three components of the pigment, the linking agent and the additive, the printing ink for different uses can be prepared. This ink is made by adding one or several infrared absorbing substances to the ink. Since the infrared ink absorbs infrared light, for example, in a certain part of the printed matter, there is no reaction in sunlight, but in the case of Under infrared radiation, the corresponding signal or dark pattern text can be observed on the screen of the mobile phone 10 screen.

The ink has different absorption characteristics for the infrared wavelength range <700~1500nm>, and can also be matched to produce non-absorbent infrared anti-counterfeiting ink and infrared absorption anti-counterfeiting ink. The non-absorbent infrared anti-counterfeiting ink is a printing ink that does not have an absorption effect on infrared rays. When used, it can be composed of a pair of infrared absorbing ink and non-absorbing infrared anti-counterfeiting ink. It is suitable for printing on various lithographic printing machines equipped with color plates in ink fountains. That is to say, there are two kinds of infrared absorbing inks and non-absorbing infrared anti-counterfeiting inks in the ink fountain. The pattern or writing of the printed matter is also composed of two kinds of inks. When used, it is not subject to any printing conditions, and this ink has a good anti-counterfeiting effect. That is to say, the identification of non-absorbing infrared anti-counterfeiting ink and infrared absorbing ink: under the observation of the mobile phone 10, where the infrared absorbing ink is used, the pattern and the text are clearly identifiable, and wherever the infrared absorbing anti-counterfeiting ink is used, The pattern and text of the printed matter are unrecognizable.

If it is recognized by the human eye, there is no absorption of infrared anti-counterfeiting ink, and the pattern and text of the printed matter cannot be recognized. The advantages of this kind of ink: strong anti-counterfeiting, technical difficulty, simple use, almost no restrictions on any printing conditions. Applicable to anti-counterfeiting printing of bills, certificates, etc.

In the above identification operation, the file to be recognized is usually placed on the desktop, and the user holds the mobile phone 10 to take a close-up (about 5 to 20 cm) for the identification file.

For close-up shooting, if an infrared light source is projected on the smooth surface of the document to be recognized, the pattern and text using the infrared absorbing ink are often invisible; this is because the projected infrared light source is too strong on the smooth surface. Reflective" enters the interference imaging.

To solve this problem of excessive reflection on a smooth surface, there are two ways:

(1) It is to adjust the intensity of infrared radiation. That is, the infrared intensity radiated by the infrared modulation module 30 is weakened by PWM control until it is discernible.

(2) illuminating the direction of the infrared modulation module 30 directly without forming a vertical illumination on the smooth surface, that is, illuminating the direction of the infrared modulation module 30 with an angle θ on the smooth surface, so that The angle θ is preferably between about 10 and 30 degrees.

(b2) Observing the "night" activities of the ecology (such as insects) during the day: Since it is necessary to observe the nighttime activities of the insects during the daytime, it is necessary to create a "simulated nighttime" environment for the insects. Since it is nighttime, of course, the observation of the human eye will not be clear. In a nighttime simulated environment, this embodiment produces a black box of the appropriate size.

The material of this black box (similar to IPF filters that can pass through the infrared) is required to block visible light through the infrared. This is called infrared permeable material. It can be photographed by the mobile phone 10 of this embodiment through infrared rays. To be able to block visible light, you can "simulate" the night environment.

The material that can block visible light through infrared rays has the following two types used in this embodiment:

The first is to make a black box using an infrared transparent black material. The acquisition of this material is based on the invention patent of the inventor Xie Mou in 2006 [the production method and application of infrared transparent black plastic products] including the invention patent of the Republic of China I 328593, the international patent alliance PCT/CN2006/002234, the United States Manufactured from the literature disclosed in the Patent Office No. 12307267 et al.

The second type is to alternately vaporize two different high and low refractive index oxides of SiO 2 and TiO 2 on a transparent substrate, such transparent glass or transparent resin (for example, PMMA, PC). A substrate called a dielectric film is made of an infrared ray-sensitive material by plating it with infrared interference (about 90%) and blocking visible light (only about 1~10% can pass). Black box (this is not black, usually gold or silver, because it is opaque, it is also a dark environment for insects in the box, so it is also referred to as black box here).

There are many kinds of coating methods for this type of coating, and this embodiment is also a double-layer protective cover for surveillance photography according to the invention of the new patent number M364878 of the inventor X [coated device for imaging a substrate] and the new patent number M346031. The device disclosed in the device] is prepared and applied.

Please refer to FIG. 9 for a schematic view of the nighttime activity of insects observed during the day. Figure 9 includes a mobile phone 10, a pair of filter sets 20, a black box 90, an insect 91, one representing visible light Lvi in the environment, one representing infrared Lir/3 in the environment, and one representing Lir/3 by the black box 90. The infrared Lir/4 reflected inside and the infrared Lir radiated by the infrared modulation module 30.

Among them, the insects in the black box 90 in Figure 9 (represented by the A in the figure) 91 are people. Invisible to the eye, it is drawn into the black box 90 for convenience of explanation, and an insect 91 is shown in the opaque black box 90 in a white irregular shape diagram.

When the dual filter set 20 is switched to an IPF: First, because it is in the daytime or under laboratory fluorescent light, the incident light L1 contains visible light Lvi and infrared Lir/3 (in the environment, fluorescent lamps or laboratory outside incidence) Sunlight) two light sources.

When the incident light L1 (visible light Lvi and infrared Lir/3) is incident on the black box 90, the visible light Lvi in the incident light L1 is blocked outside the black box 90, and the infrared Lir/3 in the incident light L1 can enter the black box 90 Inside.

The insects in the black box 90 (indicated by A in the figure) 91 are reflected by the infrared Lir/3 and then reflected, and the reflected infrared Lir/4 is penetrated through the inside of the black box 90, and penetrates the infrared Lir/4. After the IPF, the infrared image 91a of the insect 91 can be seen on the LCD of the mobile phone 10.

If the radiant energy of the infrared Lir/3 originally represented in the environment is too weak, so that the infrared image 91a of the insect 91 is not clearly visible on the LCD of the mobile phone 10 under the radiation of the infrared Lir/3 alone, it may be indoors. The infrared Lir/3 light energy is insufficient, and the infrared modulation module 30 on the mobile phone 10 can be turned on to radiate Lir to assist.

At this time, the incident light L2 of the double filter group 20 in front of the mobile phone 10 includes the Lvi in the environment, the infrared Lir radiated by the infrared modulation module 30 on the mobile phone 10 (as indicated by the reverse arrow symbol with a diagonal line), And the infrared Lir/4 that has entered the Lir/3 in the black box 90 and penetrates again, as shown by L2=Lvi+Lir+Lir/4.

L2 filters the visible light Lvi through the IPF in the double filter group 20 on the mobile phone 10, leaving Lir and Lir/4 to enter the mobile phone 10 for imaging, and the infrared image 91a of the insect 91 can be clearly seen on the LCD screen on the mobile phone 10.

After the infrared modulation module 30 is turned on, since the infrared Lir radiated by the infrared modulation module 30 is larger than the Lir/3 in the black box 90 and the infrared Lir/4 is penetrated (Lir>Lir/4), it should be possible. It is clear that "the infrared image 91a of the insect 91 is seen.

If it is because Lir is too strong to see clearly (for example, a picture with a transitional exposure), the infrared image 91a of the insect 91. Then, the VR modulates the radiation intensity of the IR-LED of the infrared modulation module 30 until a clearer image 91a of the insect 91 is seen on the LCD screen of the mobile phone 10.

In this embodiment, the infrared image 91a of the insect 91 can be clearly seen using the IPF filter.

If the IPF filter is not used, and the visible light Lvi and the infrared Lir can pass, then what is the situation?

For convenience of explanation, assuming that Lir is much larger than Lir/3, Lir/3 is ignored. That is to say, the infrared rays entering the black box 90 and the infrared rays reflected from the black box 90 are added as Lir. a. Just see the reflection of the surface of the black box 90 (such as the image around the environment or the photographer's own reflection).

2. If the visible light Lvi is approximately equal to the infrared Lir: then, the infrared image 91a of the insect 91 seen on the LCD screen of the mobile phone 10 is not very clear, and is somewhat similar to the [overexposed] picture. Because, what is seen is an image in which both the infrared image 91a and the surface of the black box 90 are reflected.

3. If the visible light Lvi is smaller than the infrared Lir: then, the infrared image 91a of the insect 91 seen on the LCD screen on the mobile phone 10 is clear. Because, I saw a [comparative] simple infrared image.

In the present embodiment, according to the invention, a new type of patent certificate No. M364878, a device for imaging a coated substrate, and a new patent number M346031, a double-layer protective cover device for monitoring photography, etc., are disclosed in the literature. The opaque (for the human eye) formed by the coated substrate has the same effect as the black box 90; that is, the infrared image 91a of the insect 91 that is clearly visible on the LCD screen of the mobile phone 10 is IPF. The filter is one of the necessary conditions.

L, L1, L2‧‧‧ incident light

Lvi‧‧ Visible light

Lir, Lir/1, Lir/2, Lir/3, Lir/4‧‧‧ Infrared

20‧‧‧Double filter set

90‧‧‧Black box

91‧‧‧Insects

Infrared image of 91a‧‧ insects

Claims (14)

A method for externally imaging an infrared image on a mobile phone, the method comprising: providing a first device externally attached to the mobile phone in an environment with infrared, manually switching the first device to an infrared mode to pass through The infrared incident on the first device can be imaged on the mobile phone after entering the lens of the mobile phone; in the environment without infrared, the first device, the second device and the third device are simultaneously externally attached to the mobile phone, and the first Switching the device to an infrared mode, turning on the power of the second device and adjusting the intensity of the IR-LED radiation on the second device, causing the IR-LED to radiate to the object after reflection, and entering the mobile device by the first device Imaging. The method of claim 1, wherein the first device is to manually switch dual filters containing ICF or IPF. The manual switching method of claim 2, wherein the manual switching further comprises front of the handset lens to which only one of the ICF or IPF dual filters can be moved. The method of claim 1, wherein the IR-LED on the second device is an infrared that has a radiation center wavelength of 850 nm or 940 nm. The method of claim 3, wherein the infrared intensity radiated by the IR-LED is controlled by a rotational transformation of the VR on the second device to output a different impedance value to output a PWM signal corresponding to a different pulse width. The method of claim 1, wherein the method for providing auxiliary infrared imaging on the mobile phone, wherein the reflection of the IR-LED after being irradiated to the object, the method for entering the mobile phone by the first device comprises: The second device and the mobile phone are received in the third device, so that the infrared radiation radiated by the IR-LED on the second device is consistent with and parallel to the direction in which the lens of the mobile phone is taken. A device externally attached to a mobile phone for providing auxiliary infrared imaging, the external device comprising: The double filter group hanging in front of the lens of the mobile phone can switch the double filter which is cut off or passed through the infrared; the support seat for accommodating the mobile phone can be externally attached; the infrared modulation module can be externally attached to the support base, wherein the The externally attached device on the mobile phone can be freely detached and combined; after combining, the infrared modulation module radiates different intensities to the infrared reflected by the object, and the infrared filter is switched through the mobile phone to enter the mobile phone for imaging. The device of claim 7, wherein the dual filter set comprises an empty casing, a double filter template and a retaining column. The empty casing according to Item 8 of the claim includes three notches such as a circular hole, an elongated sliding groove and a rectangular groove. The double filter template of claim 8, wherein the double filter template further comprises a double circular aperture plate and a sliding plate. A device as claimed in claim 7 for external infrared imaging, wherein the dual filter set is further movable inside the body of the mobile phone. The device of claim 7, wherein the infrared modulation module comprises a housing having a modulatable IR-LED disposed on the housing. The housing of claim 12, wherein the housing is further provided with a power switch, a variable resistor, and an indicator light having a battery charging input and a power state. The device of claim 7, wherein the support further comprises a space between the two stops to accommodate the charging plug.