CN113364958B

CN113364958B - Light guide part applied to camera assembly

Info

Publication number: CN113364958B
Application number: CN202110680649.2A
Authority: CN
Inventors: 汪迎福; 严慎波; 钟进志; 曾鸿敏; 陈仕权
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2019-12-25
Filing date: 2019-12-25
Publication date: 2022-12-27
Anticipated expiration: 2039-12-25
Also published as: CN110830703A; CN113364958A; CN110830703B

Abstract

The application mainly relates to a light guide part applied to a camera assembly, the camera assembly comprises a camera module and a flash lamp, the light guide part is provided with a through hole and a groove arranged on one side of the through hole, the inner side wall of the through hole is surrounded to form a light outlet surface, the inner side wall and the bottom wall of the groove are surrounded to form a light inlet surface, the groove is used for arranging the flash lamp, and light emitted by the flash lamp is emitted through the light inlet surface and is emitted from the light outlet surface after being conducted by the light guide part; the aperture of the through hole is gradually increased along the light emergent direction of the light guide piece, so that light emitted from the light emergent surface is conical to realize light condensation. The application provides a light that leaded light spare not only can guide the flash light and jet out for the camera module can obtain brighter light when shooing, and the aperture of through-hole increases along the light-emitting direction of leaded light spare gradually in the leaded light spare moreover, makes the light that goes out the plain noodles and jets out for the toper is in order to realize spotlight, so that light gathers better when the microspur is shot on being shot the object.

Description

Light guide part applied to camera assembly

Technical Field

The application relates to the technical field of electronic equipment structures, in particular to a light guide part applied to a camera assembly.

Background

With the development of electronic devices (mobile phones, tablet computers, notebook computers, wearable devices, etc.) having a camera assembly, a camera assembly having a microscope function is popular with users because it can clearly photograph tiny objects.

The camera assembly with the microscope function can photograph the tiny objects by magnifying by tens of times. However, to obtain a clear picture taking effect, an extremely bright light is required to illuminate the subject.

Disclosure of Invention

The embodiment of the application provides a light guide member applied to a camera assembly, the camera assembly comprises a camera module and a flash lamp, the light guide member is provided with a through hole and a groove arranged on one side of the through hole, the inner side wall of the through hole is surrounded to form a light outlet surface, the inner side wall and the bottom wall of the groove are surrounded to form a light inlet surface, the groove is used for arranging the flash lamp, and light emitted by the flash lamp is emitted through the light inlet surface and is emitted from the light outlet surface after being conducted by the light guide member; the aperture of the through hole is gradually increased along the light emergent direction of the light guide piece, so that light emitted from the light emergent surface is conical to realize light condensation.

The beneficial effect of this application is: compare in correlation technique, the light guide that this application provided not only can guide the light that the flash light jetted out for the camera module can obtain brighter light when shooing, and the aperture of through-hole increases gradually along the light-emitting direction of light guide in the light guide moreover, makes the light that goes out the plain noodles and jets out for the toper in order to realize spotlight, so that light gathers better on being shot the object when the microspur is shot.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic view of a camera assembly according to some embodiments of the present application;

FIG. 2 is a schematic exploded view of a camera assembly according to some embodiments of the present application;

FIG. 3 is a schematic diagram of a light guide in a camera assembly according to some embodiments of the present application;

FIG. 4 is a schematic structural diagram illustrating another perspective of a light guide in a camera assembly according to some embodiments of the present application;

FIG. 5 isbase:Sub>A schematic cross-sectional view of the light guide of FIG. 4 along the line A-A;

FIG. 6 is a schematic illustration of a portion of a light guide in a camera assembly according to some embodiments of the present application;

FIG. 7 is a schematic diagram of a partial stack of light guides in a camera assembly according to some embodiments of the present application;

FIG. 8 is a schematic view of a partial cross-sectional configuration of a camera head assembly according to some embodiments of the present application;

FIG. 9 is a schematic view of a portion of a camera head assembly according to some embodiments of the present application;

FIG. 10 is a schematic view of the attachment of a seal in a camera head assembly according to some embodiments of the present application;

FIG. 11 is a schematic diagram of an electronic device in some embodiments of the present application.

Detailed Description

The present application will be described in further detail with reference to the following drawings and examples. It is to be noted that the following examples are only illustrative of the present application, and do not limit the scope of the present application. Likewise, the following examples are only some examples and not all examples of the present application, and all other examples obtained by a person of ordinary skill in the art without any inventive work are within the scope of the present application.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

As used herein, an "electronic device" (or simply "terminal") includes, but is not limited to, an apparatus that is configured to receive/transmit communication signals via a wireline connection, such as via a Public Switched Telephone Network (PSTN), a Digital Subscriber Line (DSL), a digital cable, a direct cable connection, and/or another data connection/network, and/or via a wireless interface (e.g., for a cellular network, a Wireless Local Area Network (WLAN), a digital television network such as a DVB-H network, a satellite network, an AM-FM broadcast transmitter, and/or another communication terminal). A communication terminal arranged to communicate over a wireless interface may be referred to as a "wireless communication terminal", "wireless terminal" or "mobile terminal". Examples of mobile terminals include, but are not limited to, satellite or cellular telephones; a Personal Communications System (PCS) terminal that may combine a cellular radiotelephone with data processing, facsimile and data communications capabilities; PDAs that may include radiotelephones, pagers, internet/intranet access, web browsers, notepads, calendars, and/or Global Positioning System (GPS) receivers; and conventional laptop and/or palmtop receivers or other electronic devices that include a radiotelephone transceiver. A cellular phone is an electronic device equipped with a cellular communication module.

It should be noted that the electronic device in the embodiment of the present application is mainly directed to an electronic device with a camera structure, so as to implement functions related to photographing or image capturing of the electronic device. It can be understood that the electronic device in the present application may include an electronic device having a camera structure, such as a mobile phone, a tablet computer, a notebook computer, and a wearable device, and specifically, the electronic device in the embodiment of the present application may be a mobile phone.

The mobile phone with the microscope function has become a development trend of a future whole machine design scheme, and the mobile phone with the microscope function has the main advantage of improving the shooting effect of the whole machine on tiny objects. However, in the current technology, the difficulty is how to provide light with higher brightness for the mobile phone with microscope function when shooting tiny objects, so as to shoot tiny object images with clearer detail effect.

In the related art, in order to provide light with higher brightness to facilitate shooting tiny objects, an external light source is usually selected to supplement the light source of the mobile phone. However, the applicant finds in research that the external light source is convenient to carry and is convenient to operate with one hand; on the other hand, the plug-in light source needs an external power supply and is difficult to realize in some application scenes.

In order to solve the above problems, the idea of the technical scheme of this embodiment is to guide out and condense light emitted by a flash lamp for taking a picture of the mobile phone through a light guide structure, so that when a camera of the mobile phone takes a small object, the camera of the mobile phone is prevented from affecting the shooting effect due to insufficient light brightness. Meanwhile, the flashlight of the mobile phone is used as a light source, so that the operation by one hand is more convenient, an external power supply is not needed, and the additional power consumption of the mobile phone is not increased.

Referring to fig. 1 and 2 in combination, fig. 1 is a schematic structural diagram of a camera assembly 100 according to some embodiments of the present disclosure, and fig. 2 is a schematic structural diagram of a camera assembly 100 according to some embodiments of the present disclosure, in which the camera assembly 100 generally includes a light guide 10, a camera module 20, a circuit board 30, and a flash 40.

Specifically, the light guide 10 and the camera module 20 are respectively disposed on two sides of the circuit board 30, and the flash 40 is disposed between the light guide 10 and the circuit board 30. In addition, the circuit board 30 is electrically connected to the camera module 20 and the flash 40, respectively, to provide power for the operation of the camera module 20 and the illumination of the flash 40. As can be understood, the camera module 20 is generally composed of a lens and a photosensitive chip, and the lens is used for collecting light and then imaging an object on the surface of the photosensitive chip; the photosensitive chip is used for converting the optical signal sent by the lens into an electric signal.

Further, please refer to fig. 3, fig. 3 is a schematic structural diagram of a light guide 10 according to some embodiments of the present application, in which the light guide 10 has a through hole 11 and a groove 12 disposed at one side of the through hole 11. The camera module 20 is disposed corresponding to the through hole 11 of the light guide 10, and the flash 40 is disposed in the groove 12 of the light guide 10, so that the light emitted from the flash 40 is emitted through the light guide 10 to realize light condensation. Specifically, through hole 11 may serve as a light exit path of light guide 10, and light entering from groove 12 may be transmitted through light guide 10 and then emitted from through hole 11, which is the light exit path of light guide 10.

Further, the aperture of the through hole 11 gradually increases along the light exit direction of the light guide member 10. Specifically, referring to fig. 4 and 5 in combination, fig. 4 isbase:Sub>A schematic structural view of another view angle of the light guide 10 in some embodiments of the present application, and fig. 5 isbase:Sub>A schematic structural view ofbase:Sub>A cross section of the light guide 10 along the directionbase:Sub>A-base:Sub>A in fig. 4. The inner side wall of the through hole 11 is surrounded to form a light emitting surface 113, the inner side wall and the bottom wall of the groove 12 are surrounded to form a light inlet surface 121, light emitted by the flash lamp 40 is emitted through the light inlet surface 121 and is transmitted by the light guide 10 and then emitted from the light emitting surface 113, and the light emitted from the light emitting surface 113 is conical so as to realize light condensation. Specifically, the light f incident from the light entrance surface 121 is transmitted by the light guide 10 and then emitted from the light exit surface 113, and the aperture of the through hole 11 gradually increases in the light emission direction of the light f, so that the emitted light f is tapered, thereby achieving a light condensing effect. The light emitting surface 113 and the light entering surface 121 are disposed at an interval, so that light entering the light entering surface 121 is transmitted by the light guide 10 and then emitted from the light emitting surface 113, that is, the light guide 10 itself realizes the planning of the light transmission path.

Specifically, please refer to fig. 6 in combination, fig. 6 is a partial structural schematic diagram of the light guide 10 according to some embodiments of the present disclosure, in which the light guide 10 includes a bottom wall 101 and a top wall 102 disposed oppositely, and a side wall 103 connecting the top wall 102 and the bottom wall 101, and the through hole 11 penetrates through the bottom wall 101 and the top wall 102. At least one of the bottom wall 101, the top wall 102 and the side wall 103 is recessed to form a groove 12, and the through-hole 11 is spaced apart from the groove 12. It is understood that in the present embodiment, the bottom wall 101 is recessed to form the groove 12. Of course, in other embodiments, the recess 12 may be formed by recessing the top wall 102 or the side wall 103.

Further, in the present embodiment, the groove 12 is formed by recessing the bottom wall 101. Specifically, the bottom wall 101 is recessed in a direction toward the top wall 102 to form a light entrance surface 121. In other words, the bottom wall 101 is recessed toward the top wall 102 to form a groove 12, and the inner side wall and the bottom wall of the groove 12 surround to form the light inlet surface 121. Of course, in other embodiments, the sidewall 103 of the light guide 10 may be recessed to form the light inlet surface 121, or the bottom wall 101 and the sidewall 103 may be recessed in different directions to form a plurality of light inlet surfaces 121, so that light incident in multiple directions may be incident simultaneously.

Further, in the embodiment of the present application, the light emitting surface 113 is disposed near the top wall 102, and the light entering surface 121 is disposed near the bottom wall 101. It can be understood that, in the embodiment of the present application, the direction from the bottom wall 101 to the top wall 102 is taken as the light emitting direction, and when the light emitting direction is changed, the position relationship between the light emitting surface 113 and the light entering surface 121 can be adaptively adjusted. For example, in other embodiments, when the direction from the top wall 102 to the bottom wall 101 is taken as the light emitting direction, the light emitting surface 113 may be disposed near the bottom wall 101, and the light entering surface 121 may be disposed near the top wall 102.

Further, the end of the light emitting surface 113 away from the bottom wall 101 and the top wall 102 are located on the same plane, so that the light guide 10 in the embodiment of the present application has a better appearance performance. Of course, in other embodiments, the end of the light emitting surface 113 away from the bottom wall 101 and the top wall 102 may not be in the same plane. For example, the end of the light emitting surface 113 away from the bottom wall 101 is disposed in a step structure with the top wall 102.

It can be understood that, the light guide 10 provided in the embodiment of the present application performs polishing processing on the surfaces of the light emitting surface 113 and the light entering surface 121, so that the light guide 10 has a better light entering effect and a better light emitting effect.

In some embodiments of the present application, the through-hole 11 comprises a first hole section 111 and a second hole section 112, the first hole section 111 being disposed adjacent to the top wall 102, the second hole section 112 being disposed adjacent to the bottom wall 101; the diameter of the first hole section 111 gradually increases along a direction away from the second hole section 112, and the camera module 20 is disposed close to the second hole section 112.

Further, the inner side wall of the first hole section 111 is surrounded to form the light emitting surface 113, and the second hole section 112 is formed by extending the end part of the first hole section 111 close to the bottom wall 101 toward the bottom wall 101. It is understood that the through hole 11 is substantially horn-shaped, the first hole section 111 is substantially close to the opening of the horn, and the second hole section 112 is substantially the structural portion of the horn body. The inner sidewall of the second hole section 112 is surrounded to form a cylindrical surface to match with the camera module 20.

It will be appreciated that the diameter of the first aperture section 111 increases gradually in the light exit direction, i.e. the first aperture section 111 is substantially conical. The light emitted through the first hole segment 111 is tapered and converges towards a certain direction, i.e. the light emitted through the first hole segment 111 can achieve a light-focusing effect.

It should be noted that the terms "first", "second" and "third" in the present invention are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of the feature.

The camera subassembly that this application embodiment provided sets up out the plain noodles and advances the plain noodles through the leaded light spare interval for the light that jets out via going out the plain noodles is the toper, and then converts sharp incident light into toper emergent light, thereby realizes the spotlight effect of leaded light spare.

It can be understood that the light guide 10 is made of a transparent material so as to transmit the incident light from the light inlet surface to the light outlet surface for emission. The light guide 10 may be made of an acrylic or polycarbonate plate material, wherein the acrylic or polycarbonate plate material is an optical grade material. And printing light guide points on the bottom surface of the optical acrylic or polycarbonate plate by using processes such as laser engraving, V-shaped cross grid engraving, UV screen printing and the like. The optical grade acrylic or polycarbonate sheet material is used for absorbing incident light to stay on the surface of the optical grade sheet material, when the light irradiates each light guide point, the incident light can be diffused towards each angle, and then the incident light is emitted from the front surface of the light guide piece. The light guide pieces can uniformly emit light through various light guide points with different densities and sizes.

Further, referring to fig. 7, fig. 7 is a schematic view of a partial stacked structure of the light guide 10 in some embodiments of the present application, in which the bottom wall 101, the top wall 102, and the side wall 103 of the light guide 10 are all provided with a reflective layer 105 to improve the utilization efficiency of incident light and the conduction efficiency of light in the light guide 10. The purpose of the reflective layer 105 is to reflect the light exposed from each inner sidewall of the light guide 10 back into the light guide, thereby improving the utilization efficiency of the light.

Further, the light-shielding layer 106 is stacked on the surface of the light-reflecting layer 105 away from the light guide 10 to prevent light leakage from the light guide 10. It will be appreciated that the light-reflecting layer 105 may be formed by spraying a silver primer and then the light-blocking layer 106 may be formed by spraying a black paint.

Of course, in other embodiments, the light reflecting layer 105 and the light shielding layer 106 may be formed by, for example, coating, printing, or the like, and the formation manner of the light reflecting layer 105 and the light shielding layer 106 is not particularly limited in the embodiments of the present application.

The camera subassembly that this application embodiment provided sets up reflector layer and light shield layer through the surface at the leaded light spare, realizes effectively conducting and jets out from going out the plain noodles in the leaded light spare from the light that advances the plain noodles and jet into, and then makes the leaded light spare spotlight in order to provide the light of higher luminance.

Further, referring to fig. 8, fig. 8 is a schematic partial cross-sectional view of a camera module 100 according to some embodiments of the present disclosure, in which the camera module 20 is disposed at an end of the through hole of the light guide 10 away from the light emitting surface. Specifically, the diameter of the first hole section of through-hole is the gradual change form, and camera module 20 is close to the tip setting that first hole section diameter is less. The circuit board 30 and the groove of the light guide 10 are enclosed to form a closed space 31, and the flash lamp 40 is disposed in the closed space 31 and electrically connected to the circuit board 30.

Specifically, the circuit board 30 and the groove of the light guide 10 are enclosed to form a sealed space 31, and the flash 40 is disposed in the sealed space 31 and connected to the circuit board 30. The camera module 20 is disposed on a side of the circuit board 30 away from the groove of the light guide 10, and the camera module 20 is electrically connected to the circuit board 30.

Specifically, the camera module 20 is matched with the smaller end of the first hole section so as to conveniently obtain light rays for photographing. The circuit board 30 is electrically connected with the flash lamp 40 to supply power to the flash lamp 40, and the flash lamp 40 emits light after being powered on and enters the light inlet surface formed by the surrounding of the groove of the light guide member 10. The light rays emitted from the light inlet surface are transmitted by the light guide member and then emitted from the light emitting surface of the light guide member, and the light emitted from the light emitting surface is conical so as to realize light condensation. In the embodiment of the present application, a flash 40 is employed as the light source. Of course, in other embodiments, a light emitting diode light source similar to an LED lamp may be used as the light emitting element to provide light for the camera module to shoot.

Further, the circuit board 30 is generally disposed between the light guide 10 and the camera module 20, and the circuit board 30 can supply power to the flash 40, and can also position the light guide 10 and the camera module 20, so that the camera module 20 is opposite to the through hole of the light guide 10. The light guide 10 is fixedly connected to the circuit board 30, and it can be understood that the fixing connection mode includes, but is not limited to, gluing, snapping, screwing, and the like.

In some embodiments of the present application, please refer to fig. 9, fig. 9 is a schematic partial structural view of a camera head assembly 100 according to some embodiments of the present application, where the camera head assembly 100 further includes a sealing member 50. Specifically, the sealing member 50 is disposed between the circuit board 30 and the groove of the light guide 10 to seal the closed space 31.

Specifically, the sealing member 50 is disposed between the light guide 10 and the circuit board 30 and is fixedly connected to the light guide 10 and the circuit board 30, respectively, and it can be understood that the fixing connection manner includes, but is not limited to, gluing, snapping, screwing, and the like.

Further, the sealing member 50 substantially comprises foam, which is disposed around the flash lamp 40 and forms the enclosed space 31 together with the groove of the light guide 10 and the circuit board 40.

Specifically, a slotted hole may be formed in the contact position between the circuit board 30 or the light guide member 10 and the foam to embed and fix the foam in the slotted hole, and then the stability of the camera assembly provided in the embodiment of the present application may be further enhanced by dispensing and fixing.

Of course, in some other embodiments of the present application, please refer to fig. 10, fig. 10 is a schematic view illustrating a connection structure of a sealing member 50 in some embodiments of the present application, the sealing member 50 generally includes a foam 51, and a contact surface between the foam 51 and the light guide 10 may be configured to be stepped. The step surface of the foam 51 abuts against the light guide member 10, so that the foam 51 can play a buffering role and can position the light guide member 10. It is understood that the foam 51 and the light guide 10 can be fixedly connected by glue.

The camera assembly provided by the embodiment of the application can avoid the light leakage phenomenon by arranging the flash lamp in the closed space. Meanwhile, the foam sealing element is arranged between the light guide piece and the circuit board, so that the light guide piece and the circuit board can be prevented from being in direct contact while the sealing effect is achieved. It can be understood that the light guide member is a hard body, the circuit board can be scratched by direct contact with the circuit board, and the foam sealing member can play a certain buffering role to avoid direct contact of the circuit board and the light guide member.

Of course, in other embodiments, the sealing member 50 may also include a gel, and the contact surface of the light guide 10 and the circuit board 30 is hermetically connected by the gel. For example, the contact surface between the light guide 10 and the circuit board 30 is coated with a double-sided adhesive tape and then bonded, or the light guide 10 and the circuit board 30 may be fixedly connected by dispensing.

The camera assembly that this application embodiment provided sets up through leaded light spare and camera module relatively for the camera module can obtain brighter light when shooing, and then obtains comparatively clear effect of shooing, makes the camera assembly that this application embodiment provided have microscope shooting effect, the image of the small thing of shooting that can understand.

Referring to fig. 11, fig. 11 is a schematic structural diagram of an electronic device 1000 in some embodiments of the present application, where the electronic device 1000 generally includes a camera assembly 100 and a housing 200, where the camera assembly 100 is the camera assembly 100 in the foregoing embodiments and is not described again.

Specifically, the housing 200 has an accommodating space 201, and the camera assembly 100 is disposed in the accommodating space 201. The housing 200 has an opening 202, and the opening 202 is disposed corresponding to the camera module of the camera module assembly 100. It can be understood that, an opening 202 is opened on one side of the casing 200 close to the camera module of the camera assembly 100, and the opening 202 and the camera module are correspondingly disposed, so that the camera module of the camera assembly 100 can take/record pictures through the opening.

The electronic equipment that this application embodiment provided, in locating the accommodation space of casing with the camera subassembly, the light that sends the flash light through the light-guiding piece is derived and is gathered together through the leaded light and shine on waiting the little object of shooting to make this electronic equipment have the microscope and shoot the function, thereby can shoot the image of clear little thing.

It is noted that the terms "comprises" and "comprising," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.

The above description is only a part of the embodiments of the present application, and not intended to limit the scope of the present application, and all equivalent devices or equivalent processes performed by the contents of the specification and the drawings, or applied directly or indirectly to other related technical fields, are all included in the scope of the present application.

Claims

1. A light guide member applied to a camera assembly is characterized in that the camera assembly comprises a camera module and a flash lamp, the light guide member is provided with a through hole and a groove arranged on one side of the through hole, the inner side wall of the through hole is surrounded to form a light emitting surface, the inner side wall and the bottom wall of the groove are surrounded to form a light inlet surface, the groove is used for arranging the flash lamp, and light emitted by the flash lamp is emitted through the light inlet surface and is transmitted by the light guide member and then is emitted from the light emitting surface; the aperture of the through hole is gradually increased along the light emergent direction of the light guide piece, so that light emitted from the light emergent surface is conical to realize light condensation.

2. The light guide of claim 1, wherein the light guide comprises a bottom wall, a top wall and a side wall connecting the top wall and the bottom wall, the through hole penetrates through the bottom wall and the top wall, at least one of the bottom wall, the top wall and the side wall is recessed to form the groove, and the through hole is spaced from the groove.

3. A light guide as claimed in claim 2, wherein the through-hole comprises a first hole section disposed proximate the top wall and a second hole section disposed proximate the bottom wall; the diameter of the first hole section is gradually increased along the direction far away from the second hole section, and the camera module is arranged close to the second hole section.

4. A light guide as claimed in claim 2, wherein the light guide is made of a transparent material, and the bottom, top and side walls of the light guide are provided with a reflective layer.

5. The light guide of claim 4, wherein a light shielding layer is stacked on a surface of the light reflecting layer away from the light guide to prevent light leakage from the light guide.

6. The light guide of claim 1, wherein the camera assembly further comprises a circuit board, the circuit board and the groove enclose a closed space, and the flash is disposed in the closed space and electrically connected to the circuit board.

7. The light guide of claim 6, wherein the camera module is disposed on a side of the circuit board away from the recess, the camera module being electrically connected to the circuit board.

8. The light guide of claim 6, wherein the camera assembly further comprises a seal disposed between the circuit board and the recess to seal the enclosed space.

9. The light guide of claim 8, wherein the sealing member comprises foam, the foam surrounds the flash lamp and forms a closed space together with the groove and the circuit board.