WO2017055402A1

WO2017055402A1 - Mobile device with an optical sensor for capturing an image

Info

Publication number: WO2017055402A1
Application number: PCT/EP2016/073190
Authority: WO
Inventors: Désirée QUEREN; Ulrich Streppel; Ludwig Ploetz
Original assignee: Osram Opto Semiconductors Gmbh
Priority date: 2015-10-01
Filing date: 2016-09-29
Publication date: 2017-04-06
Also published as: DE102015116711A1

Abstract

The invention relates to a mobile device, in particular a mobile telephone, comprising an optical sensor, said optical sensor being designed to capture an image from a capturing area. A lighting element for generating light is provided, a light guide is provided. A first section of the light guide is coupled to the lighting element, a second section of the light guide is guided to the emission region in order to emit light via the emission region to the capturing area.

Description

MOBILE DEVICE WITH AN OPTICAL SENSOR FOR RECEIVING ONE

IMAGE

DESCRIPTION

The invention relates to a mobile device according to claim 1.

This patent application claims the priority of German Patent Application 10 2015 116 711.5, the disclosure of which is hereby incorporated by reference.

In the prior art, mobile phones are known which have on ei ^¬ ner back an LED as a luminous element, and wherein on the back of an optical sensor for receiving a

Image is provided. The lighting element for generating ei ^¬ ner light radiation while taking the picture vorgese ^¬ hen. The object of the invention is to provide an improved mo ^¬ Biles device with which an image can be recorded, wherein a lighting device is provided for providing light for receiving the image. The object of the invention is achieved by the mobile device according to claim 1.

Further embodiments are given in the dependent claims.

An advantage of the mobile device described is that an increased flexibility in the arrangement of the light ^¬ telementes independent of a radiation area is possible. This is achieved in that a light guide is provided which directs the light generated by the light emitting element to a Ab ^¬ beam range of the mobile device. In this way, the lighting element can be angeord ^¬ net at a position of the device, at the place for the light emitting element available stands. Thus, the design of the mobile device can be reduced. For example, the thickness of the device can be reduced because the lighting element does not have to be arranged directly behind the Ab ^¬ beam area, but can be arranged laterally thereof. The use of the light guide bie ^¬ tet a reliable line of light from the Leuchtele ^¬ ment to the radiation area.

In one embodiment, a second emission region is provided, wherein the luminous element is arranged on the second emission region in order to emit light over the second emission region. In this way it is possible to provide the light of the light-emitting element at two different emission areas. In this case, a direct light output without light ^¬ conductor takes place at the second emission area, whereas the light output takes place at the first emission area via the light guide.

In a further embodiment, a means is provided for guiding the light emitted by the luminous element into the optical waveguide or into the second radiating region. Thus, depending on the desired light output, the light can be emitted either at the first and / or at the second emission area. In this way, on the one hand, the available light can be emitted bundled at a desired emission area. On the other hand, unnecessary light emission is avoided at least one of the two emission areas. Depending on the selected embodiment, a receiving area for taking a picture may also be provided on the second emitting area.

The means may be in the form of a mechanical or electronic diaphragm, wherein the diaphragm is arranged in the beam ^path between the luminous element and the radiating region, in particular between the luminous element and the light guide. In addition, depending on the chosen embodiment, both in the beam path between the luminous element and the light guide and in the beam path between the Luminous element and the second radiating the shutter be provided. Mechanical and electronic diaphragms provide reliable means for sealing light. In a further embodiment, the light element is associated with an optical element, in particular a lens for guiding the light, wherein the light guide is coupled to the optical element. By means of the optical element, an improved coupling of the light can be achieved in the light guide.

In a further embodiment, the second emission region is arranged on a first side of the optical element, wherein the optical fiber is coupled to the optical element laterally next to the first side. Thus, both an efficient radiation over the second radiation area and a good coupling into the optical element can be achieved. The lateral coupling of the light guide to the op ^¬ diagram element prevents shadowing of the light emitted through the second emission region.

In a further embodiment the lighting element is arranged on a carrier, wherein an optical element is provided for Füh ^¬ ren of light, wherein the carrier has an opening, wherein the light guide on a second side of the

Support is coupled to the opening, wherein the optical ele ^¬ ment is formed to guide light at least partially from the first side of the carrier via the opening to the light guide. In this case, the emission direction of the luminous element is directed away from the first side of the carrier. To this

A compact arrangement of the light-emitting element and the light guide is possible with a low overall height of the device.

In a further embodiment, the light guide on the first and / or on the second section to an optical element for coupling or for coupling out of light. As a result, an improved coupling or decoupling of the light is achieved. The optical element can, for example, be formed in the form of a lens. In one embodiment of the device the light emitting element is formed as lichtemittie ^¬ emitting diode or a semiconductor laser. Both a light-emitting diode and a semiconductor laser have a sufficient light output for providing light, in particular for providing flash light for recording an image.

In a further embodiment, a second light-emitting element is provided, the input of the light guide is coupled to the second light-emitting element, and wherein the two proposed Leuch ^¬ sliding elements light with different wavelength spectra. In this way, a desired light color, in particular a desired white light can be generated.

Also may be formed depending on the selected embodiment, at least one of the light-emitting elements to generate light in the infra red wavelength range ^¬. The above-described characteristics, features and advantages of this invention, as well as the manner in which they are achieved, will become clearer and more clearly understood in connection with the following description of the embodiments, which will be described in detail in conjunction with the drawings

1 is a schematic cross-sectional view of an arrangement with a luminous element and with a light guide, FIG. 2 is a side view of the arrangement of FIG. 1,

3 is a schematic cross-sectional view of another arrangement with a luminous element, a light guide and a diaphragm,

4 is a side view of the arrangement of Fig. 3, 5 is a schematic representation of a further arrangement with a luminous element, with a diaphragm, with a light ^¬ conductor and with another aperture, Fig. 6 is a schematic representation of a further arrangement of a luminous element with an optical element,

7 is a schematic representation of a first embodiment of a mobile device with a display and an arrangement with a luminous element and a light guide,

Fig. 8 is a schematic representation of another embodiment of a mobile device having a display and an arrangement with a luminous element, and

9 shows a schematic representation of a further embodiment of a mobile device with a luminous element and a light guide. Fig. 1 shows a schematic representation of a cross section through a first embodiment of a luminous element 1, which is formed in the illustrated embodiment in the form of a light emitting diode. In the illustrated embodiment, a second light-emitting element 2 is provided in the form of a second light-emitting diode. The light-emitting diodes may be formed, for example, in the form of semiconductor chips. In addition, instead of the light-emitting diodes, laser diodes may also be arranged in the form of semiconductor chips.

The lighting elements 1, 2 are arranged on a first side 3 of a carrier 4. The lighting elements 1, 2 are ^{ausgebil ¬} det to deliver light from the first side 3 of the carrier away from Trä ^¬ ger 4. Depending on the selected embodiment, only one light-emitting element 1 can be provided. Further, an optical element 5 is provided, for example in the form of a lens or as a reflector to the light emitted by the ERS Leuchtele ^¬ elements 1, 2 in a light emitting region 7 give. Furthermore, a light guide 8 is shown schematically, which is coupled to the optical element 5.

Fig. 2 shows a schematic view of a side view of the arrangement of FIG. 1, wherein in this embodiment, a diaphragm 9 is provided between the optical element 5 and the light guide 8. The light guide 8 may be in the form of a glass fiber or plastic fiber. The aperture 9 may be in the form of an electrically or mechanically controlled aperture. For example, the aperture may be formed 9 in the form of a liquid phase crystal with partially applied electrode that applies a voltage depending on an electromagnetic field and so causes ^¬ with a gradual change of the refractive indices of the liquid phase crystal. In addition, however, the diaphragm 9 can also be designed in the form of a mechanical diaphragm, wherein the mechanical diaphragm has a cover which is opaque and which can be pushed between the optical element 5 and the optical fiber 8 in order to make out light to prevent the optical element 5 in the light guide 8. Thus, in this embodiment, when using the aperture 9, light 6 can be emitted via the emission area 7 or additionally via the light guide 8. The control of the diaphragm 9 takes place via an electronic circuit not shown above via a mechanical lever.

FIG. 3 shows a further embodiment of the arrangement of FIG. 1, wherein in this embodiment the light guide is arranged in the upper region of the optical element 5. ^¬ to which the diaphragm 9 is arranged in this embodiment above the light guide 8 between the optical element 5 and the Ab ^¬ beam area. 7 4 shows a schematic side view of the arrangement of FIG. 3. The light guide 8 can have a first coupling element 12 both in a first section 10 in order to better insert the light of the luminous element into the light guide 8. couple. In addition, depending on the selected embodiment, the light guide 8 has a decoupling element 13 at a second section, in particular at the end of the light guide, in order to better decouple the light and, in particular, to decouple the light in a desired direction. The coupling element 12 and output coupling element 13 are formed in the form of opti ^¬ rule elements, in particular in the form of lenses or reflectors. For example, domed lenses can be used as opti ^¬ cal elements. In addition, or instead of the opti- see elements reflectors may be provided to the

Redirecting light, in particular to umzulen the light by 90 ° ^¬ ken.

With the aid of the diaphragm 9 in the emission area 7, an emission of the light of the lighting elements 1, 2 can be prevented. Depending on the selected embodiment, the light guide 8 can be coupled laterally to the optical element 5 in the arrangement of the aperture 9 in the emission region 7, as shown in Fig. 2. In addition, depending on the selected embodiment, an aperture can be provided both in the emission area 7 and in the entrance area of the light guide 8, as shown schematically with reference to FIG. 5.

5 shows an embodiment of an arrangement with a luminous element 1, 2 with a diaphragm 9 in the emission area 12 and with a second diaphragm 14 between the optical element 5 and the light conductor 8. In addition, depending on the selected embodiment, the second diaphragm 14 on the second Section 11 may be located at the end of the light guide. In this embodiment, the emission of light can be prevented both via the light guide 8 and via the emission area 7 by means of the shutters 9, 14.

FIG. 6 shows, in a schematic cross-section, a further embodiment of an arrangement in which two light-emitting elements 1, 2 are arranged on a first side 3 of the carrier 4. Depending on the selected embodiment, only one light-emitting element can be provided. In addition, the carrier 4 has a Opening 15. Above the first side 3 of the carrier 1, a second optical element 16 is provided. The second optical element 16 is formed in such a way that light 6 of the luminous elements 1, 2 is partially emitted via the emission area 7 and is partially reflected back into the opening 15. The light guide 8 is coupled via a second side 31 of the carrier 4 to the opening 15. For this purpose a coupling element is beispielswei ^¬ se provided in the form of a lens, in particular in the form of a Domlinse at the end of the light guide 8 12th In addition, in the illustrated embodiment, a second

Aperture 14 between the opening 15 and the light guide 8 is arranged. Likewise, after the second optical element 16, a diaphragm 9 is arranged in the emission region 7. The second optical element 16 is in the form of a lens structure to partially pass the light 6 in the desired manner and to partially redirect it into the opening 15. For this purpose, the optical element 16 can have deflecting structures 18, for example in the form of recesses, on an upper side 17, which deflects a corresponding reflection of part of the light 6 of the lighting elements 1, 2 into the opening 15. The other part of the light 6 is emitted via the emission area 7 upwards. Depending on the selected embodiment can be dispensed with the deflecting structures 18 and the second op ^¬ table element 16 may be provided with scattering particles, so that light 6 is partially scattered back in the direction of the opening 15. With this arrangement, a small size is he ^¬ sufficient.

FIGS. 7 to 9 show various application possibilities of the arrangement of FIGS. 1 to 6 in a device 19. In the following embodiments, the embodiments of FIGS. 1 to 6 are no longer shown in detail, but are only indicated with illustration of the luminous element 1 , In each of the devices 19 of FIGS. 7 to 9, one of the embodiments of FIGS. 1 to 6 can be arranged.

Fig. 7 shows a schematic representation of a mobile device 19, for example in the form of a mobile phone or a tablet PC or in the form of a camera is formed. The mobile device 19 has a first side 20 and a second side 21. The first and second sides 20, 21 may be arranged in different directions. For example, the two sides 20, 21 can be formed by 90 ° or by 180 ° in the form of a front side and a rear side. The device 19 has an arrangement according to one of the figures 1 to 6, wherein in the illustrated embodiment the at least one luminous element 1 is arranged in the region of the rear side 21. A housing 35 of the device 19 has on the back 21 an illumination opening 22, can be emitted via the light 6 of the Leuchtele ^¬ Mentes 1. The luminous element 1 is connected to a control unit 23, which drives the luminous element 1 for emitting light. Furthermore, on the second side 21, an optical sensor 24 is provided to take a picture of a receiving area in front of the back. The optical sensor 24 is connected to the control unit 23 in connection and is driven for recording images according to the STEU ^¬ ereinheit 23rd Furthermore, the control unit 23 in the provision of diaphragms with the controllable aperture in conjunction to control depending on the desired illumination of the panels accordingly.

Furthermore, the light guide 10 is guided from the light-emitting element 1 to the first side 20, which represents a front side, to a second emission region 25. The second Abstrahlbe ^¬ rich is realized by an opening in the housing 35. Thus, light 6 can be emitted on the front side via the light guide 10 via the second emission area 25. Furthermore, on the first side 20, a second optical sensor 26 is provided to take a picture of a receiving area in front of the front side. For this purpose, the second optical ^sensor 26 is connected to the control unit 23. Thus, for example, in the embodiment of the device 19 in the form of a mobile telephone on the first side 20, a display 27 for displaying information may be formed. With the embodiment shown in FIG. 7, a picture can be taken of both the first side 20 and the second side 21. men, wherein both the radiation area 7 on the second side 21 and the second radiation area 25 on the first side 20 can be supplied with light from the light-emitting element 1.

Depending on the selected embodiment, the optical waveguide 10 or a second optical waveguide 28, which is coupled to the luminous element 1, can be guided to a third radiating region 29. The third emission region 29 may be arranged in such a way that the third emission region 29 providing a Hin ^¬ background lighting for the display 27th

FIG. 8 shows a further embodiment in which only one optical waveguide 10 is coupled to the luminous element 1. The light-emitting element 1 is formed to 7 light on the emitting region 7 on the second side 21 for receiving an image using the optical sensor 24 bereitzustel ^¬ len as shown in Fig.. The light guide 10 is guided in this embodiment to the display 27. The display 27 is arranged on the first side 20 of the device. The light guide 10 is connected to a third radiation area 29, which provides light in the form of a backlight for the display 27. The control unit 23 is connected to the diaphragms when diaphragms are provided in order to emit light of the light-emitting element 1 via the first and / or the third emission area 7, 29, depending on the selected exposure.

Fig. 9 shows a further embodiment of a device 19 in which is provided an arrangement according to the figures 1 to 6, wherein a light guide is gekop ^¬ pelt 10 to the light-emitting element 1, for directing light to a second emission region 25th In the illustrated embodiment, the second radiation region 25 is arranged on a third side 30 of the device. Depending on the selected embodiment, the second radiation region 25 can also be arranged on another side of the device 19. In addition, an optical sensor 24 is provided on the third side 30. The optical sensor represents a photosensor for taking a picture Luminous element 1 and the optical sensor 24 are driven by the control unit 23. The luminous element 1 is arranged at a distance from the second emission region 25 in the illustrated embodiment. Due to the light guide 10, an available space in the device 19 for the arrangement of the light-emitting element 1 or for the arrangement of an arrangement according to Figures 1 to 6 are selected. Thus, it is not necessary that space for the arrangement of FIGS. 1 to 6 or for the arrangement of a luminous element 1 is provided in the vicinity of the second emission area 25.

Use of the arrangements described can be provided as a lighting element for a front flash of a mobile phone for receiving a ^¬ selfies example, an LED, in addition, the LEDs are used as the main flash to record an image on the back of the phone. With ^¬ help the proposed arrangements, an available space of a device can be optimally utilized. When using a light element for a Mainflash and a frontflash of a mobile phone both space and a corresponding wiring of a second LED can be saved. Furthermore, the light guide in the second section, that is to say on an output side, can have a directional optical system. Thus, no further optics on the device is required. Furthermore, the exposure emitted by the light guide can be used for applications requiring lower brightness.

At least one of the two lighting elements 1, 2 can generate light in the infrared wavelength range. Furthermore, may be formed the first and / or the second light-emitting element 1.2, depending on the selected embodiment, in order to produce light in the visible ^¬ cash wavelength range. Although the invention in detail by the preferred embodiment has been illustrated and described in detail, the invention is not limited ^¬ by the disclosed examples and other variations may by those skilled thereof can be derived without departing from the scope of the invention.

LIST OF REFERENCE NUMBERS

1 luminous element

2 second light element

3 first side bearer

4 carriers

5 optical element

6 light

7 radiation area

8 light guides

9 aperture

10 first section light guide

11 second section light guide

12 coupling element

13 decoupling element

14 second aperture

15 opening

16 second optical element

17 top

18 deflection structure

19 device

20 first page

21 second page

22 lighting opening

23 control unit

24 optical sensor

25 second radiation area

26 second optical sensor

27 display

28 second light guide

29 third emission area

30 third page

31 second side carrier

35 housing

Claims

PATENTA'S TEST

1. Mobile device (19), in particular a mobile telephone, with an optical sensor (24, 26), wherein the optical sensor (24, 26)

is formed to receive an image of a receiving area, wherein a luminous element (1, 2) is provided for generating light, wherein a light guide (10, 28) is provided, wherein a first portion (10) of the light ^¬ conductor (10 , 28) is coupled to the light-emitting element (1, 2), wherein a second section (11) of the light guide (10, 28) is guided to a radiation area (25) in order to transmit light (6) to the light source (6) via the radiation area (25) To leave the recording area.

2. Apparatus according to claim 1, wherein the luminous element (1, 2) at a further radiation area (7) is arranged, and wherein light (6) of the luminous element (1, 2) via the wei ^¬ direct radiation area (7) can be discharged ,

3. Apparatus according to claim 2, wherein a means (9) provided

is to guide the light emitted by the light-emitting element (1, 2) light (6) in the light guide (10) or in the further radiation area (7).

4. Apparatus according to claim 3, wherein the means in the form of a

controllable diaphragm (9) is formed, wherein the diaphragm (9) in the beam path between the luminous element (1, 2) and the radiation area (25), in particular between the

Luminous element (1, 2) and the light guide (10, 20) is arranged ^¬ .

5. Apparatus according to claim 4, wherein the diaphragm (9) between the luminous element (1, 2) and the further radiation region (7) is arranged.

6. Device according to one of the preceding claims, wherein the luminous element (1, 2) an optical element (5) for guiding is associated with the light, and wherein the light guide (10, 28) is coupled to the optical element (5), wherein the optical element (5) is formed in particular in the form of a lens.

7. Device according to one of claims 2 to 5, wherein the light ^¬ telement (1, 2) is associated with an optical element (5) for guiding the light (6), and wherein the light guide (10) to the optical element (5 ), wherein the optical element (5) is formed in particular in the form of a lens, wherein the further radiation region (7) on a first side of the optical element (5) is ^{ausgebil ¬} det, and wherein the light guide (10) laterally next to the first side is coupled to the optical element (5).

8. Device according to one of the preceding claims, wherein the device (19) on a first side (20) has a display (27), wherein the emission area (25, 29) on the first side ^¬ (20) is arranged, and wherein the further Ab ^¬ beam area (7) on a second side (21) is arranged and wherein in particular the second side (21) of the first ^¬ th side opposite.

9. Device according to one of the preceding claims, wherein the luminous element (1, 2) on a first side (3) of a support (4) is arranged, wherein an optical element (16) is provided for guiding the light, wherein the carrier ( 4) has an opening (15), wherein the light ^¬ conductor (10) on a second side (31) of the carrier (4) to the opening (15) is coupled, wherein the optical element (16) is adapted to light (6) at least partially into the opening (15) to direct the light guide (10).

10. Device according to one of the preceding claims, wherein the light guide (10) on a first portion (10) and / or on a second portion (11) an optical element (12, 13) for coupling or for coupling out of light.

11. Device according to one of the preceding claims, wherein the luminous element (1, 2) is designed as a light-emitting diode or as a semiconductor laser.

12. Device according to one of the preceding claims, wherein a second luminous element (2) is provided, wherein the

Light guide (10) to the second light-emitting element (2) gekop ^¬ pelt, and wherein the two light-emitting elements (1, 2) generate light with different wavelength spectra.

13. Device according to one of the preceding claims, wherein we ^¬ least one light-emitting element (1,2) is formed to generate light in the infrared wavelength range.