Lens assembly, optical unit and electronic device

This disclosure provides a lens assembly that has an optical path and includes a lens element and a light-blocking membrane layer. The lens element has an optical portion, and the optical path passes through the optical portion. The light-blocking membrane layer is coated on the lens element and adjacent to the optical portion. The light-blocking membrane layer has a distal side and a proximal side that is located closer to the optical portion than the distal side. The proximal side includes two extension structures and a recessed structure. Each of the extension structures extends along a direction away from the distal side, and the extension structures are not overlapped with each other in a direction in parallel with the optical path. The recessed structure is connected to the extension structures and recessed along a direction towards the distal side.

BACKGROUND

Technical Field

The present disclosure relates to a lens assembly, an optical unit and an electronic device, more particularly to a lens assembly and an optical unit applicable to an electronic device.

Description of Related Art

With the development of technology, featuring high image quality becomes one of the indispensable features of an optical system nowadays. Furthermore, electronic devices equipped with optical systems are trending towards multi-functionality for various applications, and therefore the functionality requirements for the optical systems have been increasing.

However, conventional optical systems are difficult to meet the requirement of high optical quality of an electronic device under diversified development in recent years, especially a light-blocking membrane layer disposed on a lens element for eliminating stray light. Conventional light-blocking membrane layer usually has shortcomings of poor blocking-range controlling, over light blocking or severe decline of passable light, thereby unable to meet the optical quality requirement in the market of the current technology trends. Therefore, how to improve the light-blocking membrane layer to accurately control light-blocking range so as to obviously eliminate stray light for meeting the requirement of high-end-specification electronic devices is an important topic in this field nowadays.

SUMMARY

According to one aspect of the present disclosure, a lens assembly has an optical path, and the lens assembly includes a lens element and a light-blocking membrane layer. The lens element has an optical portion, and the optical path passes through the optical portion. The light-blocking membrane layer is coated on the lens element and adjacent to the optical portion. The light-blocking membrane layer has a distal side and a proximal side. The proximal side is located closer to the optical portion than the distal side. The proximal side includes two extension structures and a recessed structure. The extension structures extend along a direction away from the distal side, and the extension structures are not overlapped with each other in a direction in parallel with the optical path. The recessed structure is connected to the extension structures and recessed along a direction towards the distal side. When a shortest distance between the two extension structures at a side farthest from the distal side is ΔG, the following condition is satisfied: 0.1 [um]≤ΔG≤299.5 [um].

According to another aspect of the present disclosure, a lens assembly has an optical path, and the lens assembly includes a reflection component and a light-blocking membrane layer. The reflection component has an optical portion, and the optical path passes through the optical portion. The light-blocking membrane layer is coated on the reflection component and adjacent to the optical portion. The light-blocking membrane layer has a distal side and a proximal side. The proximal side is located closer to the optical portion than the distal side. The proximal side includes two extension structures and a recessed structure. The extension structures extend along a direction away from the distal side, and the extension structures are not overlapped with each other in a direction in parallel with the optical path. The recessed structure is connected to the two extension structures and recessed along a direction towards the distal side. When a shortest distance between the two extension structures at a side farthest from the distal side is ΔG, the following condition is satisfied: 0.1 [um]≤ΔG≤299.5 [um].

According to another aspect of the present disclosure, a lens assembly has an optical path, and the lens assembly includes a light-transmittable component and a light-blocking membrane layer. The light-transmittable component has an optical portion, and the optical path passes through the optical portion. The light-blocking membrane layer is coated on the light-transmittable component and adjacent to the optical portion. The light-blocking membrane layer has a distal side and a proximal side. The proximal side is located closer to the optical portion than the distal side. The proximal side includes two extension structures and a recessed structure. The extension structures extend along a direction away from the distal side, and the two extension structures are not overlapped with each other in a direction in parallel with the optical path. The recessed structure is connected to the two extension structures and recessed along a direction towards the distal side. When a shortest distance between the two extension structures at a side farthest from the distal side is ΔG, the following condition is satisfied: 0.1 [um]≤ΔG≤299.5 [um].

According to another aspect of the present disclosure, a lens assembly has an optical path, and the lens assembly includes a light-transmittable component and a light-blocking membrane layer. The light-transmittable component has an optical portion, and the optical path passes through the optical portion. The light-blocking membrane layer is coated on the light-transmittable component and adjacent to the optical portion. The light-blocking membrane layer further has a plurality of light-blocking areas that are spaced apart from one another. The plurality of light-blocking areas include a first light-blocking area and a second light-blocking area. The first light-blocking area is located closer to the optical path than the second light-blocking area. When a shortest distance between the first light-blocking area and rest areas of the light-blocking membrane layer is D1, and a shortest distance between the second light-blocking area and rest areas of the light-blocking membrane layer is D2, the following condition is satisfied: 0.15≤D2/D1≤1.5.

According to another aspect of the present disclosure, a lens assembly has an optical path, and the lens assembly includes a light-transmittable component and a light-blocking membrane layer. The light-transmittable component has an optical portion, and the optical path passes through the optical portion. The light-blocking membrane layer is coated on the light-transmittable component and adjacent to the optical portion. The light-transmittable component further has a first light-passable opening and a second light-passable opening that are surrounded by the light-blocking membrane layer. The first light-passable opening is closer to the optical path than the second light-passable opening. A reference plane perpendicular to the optical path is defined. When a projection area of the first light-passable opening on the reference plane is HA1, a shortest distance between the first light-passable opening and the optical path on the reference plane is HD1, a projection area of the second light-passable opening on the reference plane is HA2, and a shortest distance between the second light-passable opening and the optical path on the reference plane is HD2, the following condition is satisfied: 0.02≤(HA2{circumflex over ( )}0.5/HD2)/(HA1{circumflex over ( )}0.5/HD1)≤0.98.

According to another aspect of the present disclosure, an optical unit includes one of the aforementioned lens assemblies.

According to another aspect of the present disclosure, an electronic device includes the aforementioned optical unit.

DETAILED DESCRIPTION

The present disclosure provides a lens assembly that can be applied to an imaging system or a light emitting system. The imaging system can be an image lens module with an auto focus function or an optical image stabilization function, but the present disclosure is not limited thereto. The light emitting system can be a projection module or a display module with a zoom function, an aberration correction function or a 3D image generation function, but the present disclosure is not limited thereto.

When the lens assembly is applied to the imaging system, the incident side is considered as an object side, the emitting side is considered as an image side, and an image surface at the image side on which an image sensor is disposed can be defined. When the lens assembly is applied to the light emitting system, a light source can be, but is not limited to, an image source (e.g., liquid crystal module, digital light processing module, etc.), a laser light source, or an ultraviolet/infrared light source that is disposed at the incident side. Light from the light source at the incident side can be converged or diverged by the lens assembly and then emits towards the emitting side. Moreover, lens assembly can also be applied to the imaging system and the light emitting system at the same time, such as a time of flight (ToF) system or a lidar, but the present disclosure is not limited thereto.

The lens assembly has an optical path. The lens assembly includes an optical component and a light-blocking membrane layer. The optical component can be a light-transmittable component for the optical path to pass through or can be a reflection component for changing the direction of the optical path. Moreover, the light-transmittable component can by a lens element, a prism, or a filter, but the present disclosure is not limited thereto. Moreover, the reflection component can have a total reflection surface, a specular reflection surface or a partial reflection surface, but the present disclosure is not limited thereto. Note that the partial reflection means that light is partially reflected but partially passes or is absorbed. Further, light can be selectively and partially reflected according to its characteristics, such as wavelength.

The optical component has an optical portion, and the optical path passes through the optical portion. When the optical component is the lens element, the lens element can be a molded glass lens element which can be manufactured by a compression molding process, an injection molding process, or an injection-compression molding process. When the optical component is a reflection component, the reflection component can have a V-shaped groove. The V-shaped groove can have two light-blocking surfaces that are gradually spaced apart from each other from the optical portion along a direction away from the optical path. Moreover, the V-shaped groove can further have a plurality of curved protrusions that are sequentially arranged and are connected to the light-blocking surfaces.

The optical component can have at least one aspheric surface where the optical portion can pass. When the optical component is the reflection component, the aspheric surface of the reflection component can provide a light convergence function or a light divergence function so as to reduce the quantity of the components in the lens assembly. Moreover, the aspheric surface can also be a freeform surface.

The optical component can further have an optical surface and a connection surface. The optical portion can pass to the optical surface. The optical portion can generate refraction or reflection on the optical surface. Specifically, the surface shape of the optical surface can be, but is not limited to, a flat surface, a spherical surface, or an aspheric surface, and the optical surface can be, but is not limited to, a light-transmittable surface, a reflective surface, or a light splitting surface. The connection surface can be connected to the optical surface with a boundary therebetween. The boundary can be generated by two non-parallel planes, a chamfer, a rounded corner, or any method to connect two surfaces.

The optical component can further have an incident surface, at least one reflection surface and an emitting surface that are sequentially passed by the optical portion along the optical path.

The optical component can further have an edge portion that is recessed along a direction towards the optical path or protruded along a direction away from the optical path. The edge portion can be configured to correspond to a counterpart portion of a carrier, and the edge portion can be configured to be disposed opposite to the counterpart portion so that the optical component is accommodated in the carrier. Therefore, it is favorable for positioning the orientation of the optical component with respect to the carrier.

The optical component can further have a first light-passable opening and a second light-passable opening that are surrounded by the light-blocking membrane layer, and the first light-passable opening is closer to the optical path than the second light-passable opening. Therefore, it is favorable for increasing the light amount passing through the edge of the optical portion so as to increase optical quality.

The light-blocking membrane layer is coated on the optical component and is adjacent to the optical portion. Moreover, the light-blocking membrane layer can also be coated on the edge portion of the optical component. Therefore, it is favorable for preventing generating stray light at the edge portion. Moreover, the light-blocking membrane layer can also be coated on the optical surface and the boundary at the same time. Since stray light may be easily generated on two connected surfaces of the optical component at a side close to the boundary due to a relatively large change of lens surface, coating the light-blocking membrane layer on the optical surface and the boundary at the same time can reduce the stray light. Moreover, the light-blocking membrane layer can also be coated on at least one of the two light-blocking surfaces of the V-shaped groove. Moreover, the light-blocking membrane layer can also be coated on the plurality of curved protrusions of the V-shaped groove so as to form extension structures and recessed structure which will be descried later.

The light-blocking membrane layer can be a single-layer membrane including a light-blocking layer with a light blocking function. In detail, the light-blocking layer can be a black coating that achieves the purpose of blocking light by absorbing visible light. The light-blocking layer can also be a neutral-density coating that achieves the purpose of blocking light by preventing light from passing through. However, the abovementioned methods and coatings are not intended to limit the present disclosure. The light-blocking layer can have different degrees of light-blocking due to different light-blocking methods and manufacturing processes, and light with specific wavelengths can selectively pass through. The light-blocking layer can have various light-blocking characteristics at the same time so as to further increase optical quality. Please refer toFIG.79, which shows the light-blocking membrane layer BM coated on the optical component OL, wherein the light-blocking membrane layer BM inFIG.79is a single-layer membrane including the light-blocking layer BM1. However, the thickness of the layer inFIG.79is not intended to limit the present disclosure.

The light-blocking membrane layer can also be formed by stacking a plurality of layers. In addition to a light-blocking layer, the plurality of layers can further include, but is not limited to, various layers, such as an interlayer, an insulation layer, an ultraviolet/infrared (UV/IR) resistance layer, an anti-reflection layer, and a hydrophobic layer. Therefore, it is favorable for achieving more effects such as better light-blocking, increased adhesion, and longer life span. However, the abovementioned effects are not intended to limit the present disclosure. Please refer toFIG.80, which shows the light-blocking membrane layer BM coated on the optical component OL, wherein the light-blocking membrane layer BM is formed by stacking a plurality of layers including the interlayer BM2, the IR resistance layer BM3, the light-blocking layer BM1, the UV resistance layer BM4, the anti-reflection layer BM5, and the hydrophobic layer BM6. However, the stacking sequence and the thicknesses of the layers inFIG.80are not intended to limit the present disclosure.

The light-blocking membrane layer can also include a photosensitive layer, such that the light-blocking membrane layer can be patterned by irradiating light with specific wavelengths so as to control the light-blocking range in the circumferential direction. Therefore, it is favorable for increasing the precision and quality of light-blocking. Moreover, the photosensitive layer can be a light-blocking layer or an interlayer, but the present disclosure is not limited thereto. When the photosensitive layer is the light-blocking layer, a patterned surface with high-precision can be formed by irradiating light with specific wavelengths so as to increase optical quality. When the photosensitive layer is the interlayer, the patterned light-blocking layer can be coated through the difference in affinity so as to increase optical quality. Moreover, the light-blocking membrane layer can further include a cover layer which insulates the photosensitive layer from air. Therefore, it is favorable for protecting the photosensitive layer. Note that the cover layer can have functions such as air insulation and UV/IR resistance and can further have other functions such as anti-reflection, anti-fouling, and hydrophobic. For example, the anti-reflection layer BM5and the hydrophobic layer BM6inFIG.80. However, the present disclosure is not limited thereto.

The light-blocking membrane layer coated on the optical component can have an edge with a vertical surface. Therefore, it is favorable for simplifying the manufacturing process and increasing manufacturing efficiency. Please refer toFIG.81, which shows the vertical edge of the light-blocking membrane layer BM coated on the optical component OL. Alternatively, the light-blocking membrane layer coated on the optical component can have an edge with an inclined surface or a curved surface. Therefore, it is favorable for further reducing stray light generated by light passing through the edge so as to increase optical quality. Please refer toFIG.82toFIG.83, which respectively show the inclined edge and the curved edge of the light-blocking membrane layer BM coated on the optical component OL.

The light-blocking membrane layer can have a distal side and a proximal side. The proximal side is located closer to the optical portion than the distal side. The proximal side can include two extension structures and a recessed structure. Each of the extension structures can extend along a direction away from the distal side, and the extension structures can be not overlapped with one another in a direction in parallel with the optical path. The recessed structure can be connected to the extension structures and can be recessed along a direction towards the distal side. Therefore, it is favorable for preventing light diffraction while effectively blocking unwanted light, thereby ensuring optical quality. It is noted that the unwanted light can be stray light generated on the image surface in the imaging system or can generate light spots on the projection surface in the light emitting system, but the present disclosure is not limited thereto. Moreover, the extension structures can also be coated on part of the optical surface. Moreover, the extension structures can be disposed at a side of the V-shaped groove close to the optical path. Moreover, the extension structures can be disposed at least one of the incident surface, the at least one reflection surface and the emitting surface.

The light-blocking membrane layer can further have a plurality of light-blocking areas. Therefore, it is favorable for improving optical quality at periphery of the optical portion. The light-blocking areas can be spaced apart from one another. The light-blocking areas can include a first light-blocking area and a second light-blocking area, and the first light-blocking area is located closer to the optical path than the second light-blocking area. Moreover, the light-blocking areas can be disposed on at least one of the incident surface, the at least one reflection surface and the emitting surface.

A thickness of the light-blocking membrane layer can gradually decrease from the recessed structure to the extension structures. That is, a thickness of the light-blocking membrane layer can gradually increase from a side of the extension structures close to the optical path towards the recessed structure. Therefore, it is favorable for increasing dimensional accuracy of the extension structures so as to ensure optical quality. Moreover, a thickness of the first light-blocking area can be smaller than a thickness of the second light-blocking area. When a shortest distance between the extension structures at a side farthest from the distal side is ΔG, the following condition can be satisfied: 0.1 [um]≤ΔG≤299.5 [um]. Therefore, it is favorable for controlling the degree of blocking light through changing the distance between the extension structures so as to improve optical quality. Moreover, the following condition can also be satisfied: 0.5 [um]≤ΔG≤200 [um]. Moreover, the following condition can also be satisfied: 0.7 [um]≤ΔG≤150 [um]. Please refer toFIG.7, which shows ΔG according to the 1st embodiment of the present disclosure.

When a shortest distance between the first light-blocking area and rest areas of the light-blocking membrane layer is D1, and a shortest distance between the second light-blocking area and rest areas of the light-blocking membrane layer is D2, the following condition can be satisfied: 0.15≤D2/D1≤1.5. Therefore, it is favorable for making the transition of light smooth from the center to the edge of the optical portion. Please refer toFIG.38, which shows D1and D2according to the 4th embodiment of the present disclosure. It is noted that the term “rest areas of the light-blocking membrane layer” used herein can be considered as a part of the light-blocking membrane layer without including the first light-blocking area when referring D1or without including the second light-blocking area when referring D2.

A reference plane perpendicular to the optical path is defined. When a projection area of the first light-passable opening on the reference plane is HA1, a shortest distance between the first light-passable opening and the optical path on the reference plane is HD1, a projection area of the second light-passable opening on the reference plane is HA2, and a shortest distance between the second light-passable opening and the optical path on the reference plane is HD2, the following condition can be satisfied: 0.02≤(HA2{circumflex over ( )}0.5/HD2)/(HA1{circumflex over ( )}0.5/HD1) 0.98. Therefore, it is favorable for making the transition of light smooth from the center to the edge of the optical portion.

There are a first axis and a second axis defined on the reference plane that is perpendicular to the optical path. The first axis, the second axis and the optical path are perpendicular to one another. The optical portion can be symmetrical with respect to at least one of the first axis and the second axis. Moreover, the edge portion can be spaced apart from the first axis or the second axis. When a width of the optical portion along the first axis is S1, and a width of the optical portion along the second axis is S2, the following condition can be satisfied: 0.3<S1/S2<0.9. Therefore, it is favorable for making the optical portion to be non-circular so as to reduce the size thereof, and it is also favorable for arranging the edge portion to correspond to the width range of the optical portion so as to further position the optical portion and the carrier in a particular direction. Please refer toFIG.6, which shows S1and S2according to the 1st embodiment of the present disclosure.

When an average thickness of the light-blocking membrane layer is T, the following condition can be satisfied: 0.9 [um]≤T≤10 [um]. Therefore, it is favorable for reducing the average thickness of the light-blocking membrane layer under the premise that the light-blocking membrane layer can effectively block light so as to prevent generating stray light due to light passing through the edge of the light-blocking membrane layer.

When a longest distance in parallel with the optical path between the extension structures and the recessed structure is ΔH, the following condition can be satisfied: 0.5 [um]≤ΔH≤249.5 [um]. Therefore, it is favorable for increasing the incident amount of oblique light so as to increase the amount of passable light. Moreover, the following condition can also be satisfied: 1 [um]≤ΔH≤200 [um]. Moreover, the following condition can also be satisfied: 2 [um]≤ΔH≤150 [um]. Note that the junction of the light-blocking membrane layer and the optical component is used for calculating ΔH if the thickness of the light-blocking membrane layer is not negligible. Please refer toFIG.10andFIG.11, which show ΔH according to the 1st embodiment of the present disclosure.

When a longest distance in parallel with the optical path between the first light-blocking area and the second light-blocking area is ΔHs, the following condition can be satisfied: 0.5 [um]≤ΔHs≤249.5 [um]. Therefore, it is favorable for increasing the incident amount of oblique light so as to increase the amount of passable light. Moreover, the following condition can also be satisfied: 1 [um]≤ΔHs≤200 [um]. Moreover, the following condition can also be satisfied: 2 [um]≤ΔHs≤150 [um]. Note that the junction of the light-blocking membrane layer and the optical component is used for calculating ΔHs if the thickness of the light-blocking membrane layer is not negligible.

When a longest distance in parallel with the optical path between the first light-passable opening and the second light-passable opening is ΔHh, the following condition can be satisfied: 0.5 [um]≤ΔHh≤249.5 [um]. Therefore, it is favorable for increasing the incident amount of oblique light so as to increase the amount of passable light. Moreover, the following condition can also be satisfied: 1 [um]≤ΔHh≤200 [um]. Moreover, the following condition can also be satisfied: 2 [um]≤ΔHh≤150 [um]. Note that the junction of the light-blocking membrane layer and the optical component is used for calculating ΔHh if the thickness of the light-blocking membrane layer is not negligible.

According to the present disclosure, the aforementioned features and conditions can be utilized in numerous combinations so as to achieve corresponding effect.

Please refer toFIG.1toFIG.11, whereFIG.1is an isometric view of an optical unit according to the 1st embodiment of the present disclosure,FIG.2is an exploded view of the optical unit inFIG.1,FIG.3is another exploded view of the optical unit inFIG.1,FIG.4is a partially exploded view of the optical unit inFIG.3for showing a fifth lens element and a carrier thereof,FIG.5is an image-side view of the fifth lens element inFIG.4with no light-blocking membrane layer coated thereon,FIG.6is an image-side view of the fifth lens element assembled in the carrier inFIG.4with a light-blocking membrane layer coated thereon,FIG.7is an enlarged view of AA region of the fifth lens element inFIG.6,FIG.8is a side view of the fifth lens element inFIG.6,FIG.9is an image-side view of the fifth lens element inFIG.6,FIG.10is a cross-sectional view of the fifth lens element inFIG.9taken along line10-10, andFIG.11is a cross-sectional view of the fifth lens element inFIG.9taken along line11-11.

In this embodiment, the optical unit1is an image lens. The optical unit1includes a carrier11, a lens assembly12and a filter13and has an image surface14. The carrier11has a counterpart portion11athat is a flat area at the inner side of the carrier11for easily accommodating and positioning the lens assembly12in the carrier11. The lens assembly12has an optical path101and includes, in order from an object side to an image side along the optical path101, a first lens element110, a first spacer SP1, a second lens element120, a second spacer SP2, a third lens element130, a fourth lens element140, a third spacer SP3, a fifth lens element150, a light-blocking membrane layer190and a retainer RT. The filter13is located at an image side of the lens assembly12. The image surface14is located at an image side of the filter13. Light will be converged and then image on the image surface14after passing through the lens assembly12. When a maximum image height of the lens assembly12is 5.0 millimeters (mm), half of a maximum field of view (HFOV) is correspondingly 60.0 degrees, and the optical unit1is therefore an ultra-wide-angle lens.

There are a first axis AX1and a second axis AX2defined on a reference plane that is perpendicular to the optical path101, and the first axis AX1, the second axis AX2and the optical path101are perpendicular to one another.

The fifth lens element150has an optical portion151that is symmetrical with respect to the first axis AX1and the second axis AX2, and the optical path101passes through the optical portion151. The fifth lens element150further has an optical surface152and a connection surface153at an image side thereof. The optical surface152is a light-passable aspheric surface; more specifically, the optical surface152is a freeform surface. The optical portion151passes through the optical surface152, and the optical portion151generates refraction on the optical surface152. The connection surface153is connected to the optical surface152with a boundary BD therebetween.

The fifth lens element150further has two edge portions154that are recessed along the second axis AX2towards the optical path101and are spaced apart from the first axis AX1. The edge portions154correspond to counterpart portions11aof the carrier11and are disposed opposite to the counterpart portions11aso that the fifth lens element150is easily accommodated and positioned in the carrier11for increasing manufacturing efficiency.

The light-blocking membrane layer190is surrounding and disposed adjacent to the optical portion151and is coated on the optical surface152, the boundary BD and the connection surface153of the fifth lens element150so as to reduce stray light generated at the boundary BD and thus increase optical quality. Please refer toFIG.5toFIG.6, which show the steps before and after coating the light-blocking membrane layer190on the fifth lens element150.

The light-blocking membrane layer190has a distal side191and a proximal side192respectively at two ends thereof along the first axis AX1. The proximal side192is located closer to the optical portion151than the distal side191. The proximal side192includes a plurality of extension structures1921and a plurality of recessed structures1922. The extension structures1921and the recessed structures1922are disposed on the optical surface152. Each of the extension structures1921extends along a direction away from the distal side191, and the extension structures1921are not overlapped with one another in a direction in parallel with the optical path101. The recessed structures1922are connected to and located between two adjacent extension structures1921and are recessed along a direction towards the distal side191.

A thickness of the light-blocking membrane layer190gradually decreases from the recessed structures1922to the extension structures1921. In other words, a thickness of the light-blocking membrane layer190gradually increases from a side of the extension structures1921close to the optical path101towards the recessed structures1922. It is noted that for clearly showing the coating range of the light-blocking membrane layer190, the light-blocking membrane layer190inFIG.10toFIG.11is not at its real scale.

When a shortest distance between the extension structures1921at a side farthest from the distal side191is ΔG, the following condition is satisfied: ΔG=105.5 [um].

When a width of the optical portion151along the first axis AX1is S1, and a width of the optical portion151along the second axis AX2is S2, the following conditions are satisfied: S1=2.384 [mm]; S2=3.072 [mm]; and S1/S2=0.776.

When an average thickness of the light-blocking membrane layer190is T, the following condition is satisfied: 0.9 [um]≤T≤10 [um].

As shown in the cross-sectional views ofFIG.10andFIG.11, when a longest distance in parallel with the optical path101between the extension structures1921and the recessed structures1922is ΔH, the following conditions are satisfied: ΔH=36.4 [um] while in the cross-sectional view ofFIG.10; ΔH=47.8 [um] while in the cross-sectional view ofFIG.11.

Please refer toFIG.12toFIG.19, whereFIG.12is an isometric view of an optical unit according to the 2nd embodiment of the present disclosure,FIG.13is an exploded view of the optical unit inFIG.12,FIG.14is another exploded view of the optical unit inFIG.12,FIG.15is an enlarged view of a fourth lens element of the optical unit inFIG.13,FIG.16is an object-side view of the fourth lens element inFIG.15,FIG.17is a side view of the fourth lens element inFIG.15,FIG.18is a cross-sectional view of the fourth lens element inFIG.16taken along line18-18, andFIG.19is an enlarged view of BB region of the fourth lens element inFIG.16.

In this embodiment, the optical unit2is an image lens. The optical unit2includes a carrier21, a lens assembly22and a filter23and has an image surface24. The carrier21accommodates the lens assembly22. The lens assembly22has an optical path201and includes, in order from an object side to an image side along the optical path201, a first lens element210, a first spacer SP1, a second lens element220, a second spacer SP2, a third lens element230, a light-blocking membrane layer290, a fourth lens element240, a third spacer SP3, a fifth lens element250and a retainer RT. The filter23is located at an image side of the lens assembly22. The image surface24is located at an image side of the filter23. Light will be converged and then image on the image surface24after passing through the lens assembly22. When a maximum image height of the lens assembly22is 5.0 millimeters (mm), half of a maximum field of view (HFOV) is correspondingly 60.0 degrees, and the optical unit2is therefore an ultra-wide-angle lens.

The fourth lens element240has an optical portion241, and the optical path201passes through the optical portion241. The fourth lens element240is a molded glass lens element, such that the sensitivity of the fourth lens element240to temperature changes is reduced. The fourth lens element240further has an optical surface242at an object side thereof. The optical surface242is a light-passable aspheric surface. The optical portion241passes through the optical surface242, and the optical portion241generates refraction on the optical surface242. The fourth lens element240further has a plurality of first light-passable openings245a, a plurality of second light-passable openings245b, a plurality of third light-passable openings245c, a plurality of fourth light-passable openings245d, a plurality of fifth light-passable openings245e, a plurality of sixth light-passable openings245f, a plurality of seventh light-passable openings245g, a plurality of eighth light-passable openings245h, a plurality of ninth light-passable openings245i, a plurality of tenth light-passable openings245j, a plurality of eleventh light-passable openings245k, a plurality of twelfth light-passable openings245mand a plurality of thirteenth light-passable openings245n. Each of the first light-passable openings245ato the thirteenth light-passable openings245nare surrounded by the light-blocking membrane layer290for increasing the amount of passable light of the fourth lens element240. The first light-passable openings245ato the thirteenth light-passable openings245nare sequentially arranged along a direction away from the optical path201.

The light-blocking membrane layer290is surrounding and disposed adjacent to the optical portion241and is coated on the optical surface242and an outer diameter surface ODS of the fourth lens element240.

The light-blocking membrane layer290has a distal side291and a proximal side292. The distal side291is disposed on the outer diameter surface ODS of the fourth lens element240. The proximal side292is disposed on an object side of the fourth lens element240and located closer to the optical portion241than the distal side291. The proximal side292includes a plurality of extension structures2921and a plurality of recessed structures2922. The extension structures2921and the recessed structures2922are disposed on the optical surface242. Each of the extension structures2921extends along a direction away from the distal side291, and the extension structures2921are not overlapped with one another in a direction in parallel with the optical path201. The recessed structures2922are connected to and located between two adjacent extension structures2921and are recessed along a direction towards the distal side291.

A thickness of the light-blocking membrane layer290gradually decreases from the recessed structures2922to the extension structures2921. In other words, a thickness of the light-blocking membrane layer290gradually increases from a side of the extension structures2921close to the optical path201towards the recessed structures2922. It is note that for clearly showing the coating range of the light-blocking membrane layer290, the light-blocking membrane layer290inFIG.18is not at its real scale.

When a shortest distance between the extension structures2921at a side farthest from the distal side291is ΔG, the following condition is satisfied: ΔG=51.0 [um].

A reference plane perpendicular to the optical path201is defined. When a projection area of the first light-passable opening245aon the reference plane is HA1, a shortest distance between the first light-passable opening245aand the optical path201on the reference plane is HD1, a projection area of the second light-passable opening245bon the reference plane is HA2, a shortest distance between the second light-passable opening245band the optical path201on the reference plane is HD2, a projection area of the third light-passable opening245con the reference plane is HA3, a shortest distance between the third light-passable opening245cand the optical path201on the reference plane is HD3, a projection area of the fourth light-passable opening245don the reference plane is HA4, a shortest distance between the fourth light-passable opening245dand the optical path201on the reference plane is HD4, a projection area of the fifth light-passable opening245eon the reference plane is HA5, a shortest distance between the fifth light-passable opening245eand the optical path201on the reference plane is HD5, a projection area of the sixth light-passable opening245fon the reference plane is HA6, a shortest distance between the sixth light-passable opening245fand the optical path201on the reference plane is HD6, a projection area of the seventh light-passable opening245gon the reference plane is HA7, a shortest distance between the seventh light-passable opening245gand the optical path201on the reference plane is HD7, a projection area of the eighth light-passable opening245hon the reference plane is HA8, a shortest distance between the eighth light-passable opening245hand the optical path201on the reference plane is HD8, a projection area of the ninth light-passable opening245ion the reference plane is HA9, a shortest distance between the ninth light-passable opening245iand the optical path201on the reference plane is HD9, a projection area of the tenth light-passable opening245jon the reference plane is HA10, a shortest distance between the tenth light-passable opening245jand the optical path201on the reference plane is HD10, a projection area of the eleventh light-passable opening245kon the reference plane is HA11, a shortest distance between the eleventh light-passable opening245kand the optical path201on the reference plane is HD11, a projection area of the twelfth light-passable opening245mon the reference plane is HA12, a shortest distance between the twelfth light-passable opening245mand the optical path201on the reference plane is HD12, a projection area of the thirteenth light-passable opening245non the reference plane is HA13, and a shortest distance between the thirteenth light-passable opening245nand the optical path201on the reference plane is HD13, the following conditions in TABLE 1 are satisfied:

In TABLE 1, “X” represent to “1” in parameter referring values for the first light-passable opening245ato “13” in parameter referring values for the thirteenth light-passable opening245n. For example, if X equals to “2” (e.g., X=2 in TABLE 1), HAX=HA2, HDX=HD2, HAX{circumflex over ( )}0.5/HDX=HA2{circumflex over ( )}0.5/HD2, and (HAX{circumflex over ( )}0.5/HDX)/(HA(X−1){circumflex over ( )}0.5/HD(X−1))=(HA2{circumflex over ( )}0.5/HD2)/(HA1{circumflex over ( )}0.5/HD1), wherein HAX{circumflex over ( )}0.5/HDX can represent to aperture ratio. According to TABLE 1, the aperture ratio is gradually decreased along a direction away from the optical path201, such that the amount of light passing through the lens element is gradually reduced so as to ensure smooth light intensity.

When an average thickness of the light-blocking membrane layer290is T, the following condition is satisfied: 0.9 [um]≤T≤10 [um].

When a longest distance in parallel with the optical path201between the first light-passable opening245aand the thirteenth light-passable opening245nis ΔHh, the following condition is satisfied: 0.5 [um]≤ΔHh≤249.5 [um].

Please refer toFIG.20toFIG.29, whereFIG.20is an isometric view of an optical unit according to the 3rd embodiment of the present disclosure,FIG.21is an isometric view of the optical unit inFIG.20that is partially sectioned,FIG.22is an exploded view of the optical unit inFIG.20,FIG.23is an enlarged view of a fifth lens element of the optical unit inFIG.22,FIG.24is a side view of the fifth lens element inFIG.23along a first axis,FIG.25is an emitting-side view of the fifth lens element inFIG.23,FIG.26is a side view of the fifth lens element inFIG.23along a second axis,FIG.27is an emitting-side view of the fifth lens element inFIG.23,FIG.28is a cross-sectional view of the fifth lens element inFIG.27taken along line28-28, andFIG.29is a cross-sectional view of the fifth lens element inFIG.27taken along line29-29.

In this embodiment, the optical unit3is a projector lens. The optical unit3includes a carrier31and a lens assembly32and has a light source surface35. The carrier31has a counterpart portion31athat is a flat area at the inner side of the carrier31for easily accommodating and positioning the lens assembly32in the carrier31. The lens assembly32has an optical path301and includes, in order from an object side to an image side along the optical path301, a first lens element310, a second lens element320, a first spacer SP1, a third lens element330, a fourth lens element340, a fifth lens element350and two light-blocking membrane layers390. The light source surface35is located at an incident side of the lens assembly32. When the optical unit3is applied to an electronic device (not shown in this embodiment), an image source (not shown in this embodiment) such as a liquid crystal module or a digital light processing module can be used as a light source which is disposed on the light source surface35for projecting light towards the lens assembly32. Light will be converged and then image on a projection surface (not shown in this embodiment) after passing through the lens assembly32, wherein a focal length (f) of the lens assembly32is 14.5 millimeters (mm), an f-number (Fno) of the lens assembly32is 3.4, and an angle of projection (AOP) in the diagonal direction of the lens assembly32is 21.8 degrees. Note that the lens assembly32can also be applied to an imaging system; when a maximum image height of the lens assembly32is 2.5 millimeters, half of a maximum field of view (HFOV) is correspondingly 9.75 degrees, and the optical unit3is therefore a telephoto lens.

There are a first axis AX1and a second axis AX2defined on a reference plane that is perpendicular to the optical path301, and the first axis AX1, the second axis AX2and the optical path301are perpendicular to one another.

The fifth lens element350has an optical portion351that is symmetrical with respect to the first axis AX1and the second axis AX2, and the optical path301passes through the optical portion351. The fifth lens element350further has an optical surface352at an emitting side thereof. The optical surface352is a light-passable aspheric surface. The optical portion351passes through the optical surface352, and the optical portion351generates refraction on the optical surface352.

The fifth lens element350further has two edge portions354that are recessed along the first axis AX1towards the optical path301and are spaced apart from the second axis AX2. The edge portions354correspond to counterpart portions31aof the carrier31and are disposed opposite to the counterpart portions31aso that the fifth lens element350is easily accommodated and positioned in the carrier31for increasing manufacturing efficiency.

The light-blocking membrane layers390are surrounding and disposed adjacent to the optical portion351and are coated on the optical surface352and the edge portions354of the fifth lens element350so as to reduce stray light generated at the junction between the optical surface352and the edge portions354and thus increase optical quality.

Each of the light-blocking membrane layers390has a distal side391and a proximal side392respectively at two ends thereof along the first axis AX1. The proximal side392is located closer to the optical portion351than the distal side391. The proximal side392includes a plurality of extension structures3921and a plurality of recessed structures3922. The extension structures3921and the recessed structures3922are disposed on the optical surface352. Each of the extension structures3921extends along a direction away from the distal side391, and the extension structures3921are not overlapped with one another in a direction in parallel with the optical path301. The recessed structures3922are connected to and located between two adjacent extension structures3921and are recessed along a direction towards the distal side391.

A thickness of each of the light-blocking membrane layers390gradually decreases from the recessed structures3922to the extension structures3921. In other words, a thickness of each of the light-blocking membrane layers390gradually increases from a side of the extension structures3921close to the optical path301towards the recessed structures3922. It is note that for clearly showing the coating range of the light-blocking membrane layers390, the light-blocking membrane layers390inFIG.28toFIG.29are not at their real scale.

When a shortest distance between the extension structures3921at a side farthest from the distal side391is ΔG, the following condition is satisfied: ΔG=160 [um].

When a width of the optical portion351along the first axis AX1is S1, and a width of the optical portion351along the second axis AX2is S2, the following conditions are satisfied: S1=3.87 [mm]; S2=4.26 [mm]; and S1/S2=0.908.

When an average thickness of the light-blocking membrane layers390is T, the following condition is satisfied: 0.9 [um]≤T≤10 [um].

As shown in the cross-sectional views ofFIG.28andFIG.29, when a longest distance in parallel with the optical path301between the extension structures3921and the recessed structures3922is ΔH, the following conditions are satisfied: ΔH=152.4 [um] while in the cross-sectional view ofFIG.28; ΔH=167.2 [um] while in the cross-sectional view ofFIG.29.

Please refer toFIG.30toFIG.38, whereFIG.30is an isometric view of an optical unit according to the 4th embodiment of the present disclosure,FIG.31is an isometric view of the optical unit inFIG.30that is partially sectioned,FIG.32is an exploded view of the optical unit inFIG.30,FIG.33is an enlarged view of a fourth lens element of the optical unit inFIG.32,FIG.34is a side view of the fourth lens element inFIG.33,FIG.35is an emitting-side view of the fourth lens element inFIG.33,FIG.36is a cross-sectional view of the fourth lens element inFIG.33taken along line36-36,FIG.37is an enlarged view of CC region of the fourth lens element inFIG.35, andFIG.38is an enlarged view of DD region of the fourth lens element inFIG.37.

In this embodiment, the optical unit4is a projector lens. The optical unit4includes a carrier41and a lens assembly42and has a light source surface45. The carrier41accommodates the lens assembly42. The lens assembly42has an optical path401and includes, in order from an object side to an image side along the optical path401, a first lens element410, a second lens element420, a first spacer SP1, a third lens element430, a fourth lens element440, a light-blocking membrane layer490and a fifth lens element450. The light source surface45is located at an incident side of the lens assembly42. When the optical unit4is applied to an electronic device (not shown in this embodiment), an image source (not shown in this embodiment) such as a liquid crystal module or a digital light processing module can be used as a light source which is disposed on the light source surface45for projecting light towards the lens assembly42. Light will be converged and then image on a projection surface (not shown in this embodiment) after passing through the lens assembly42, wherein a focal length (f) of the lens assembly42is 14.5 millimeters (mm), an f-number (Fno) of the lens assembly42is 3.4, and an angle of projection (AOP) in the diagonal direction of the lens assembly42is 21.8 degrees. Note that the lens assembly42can also be applied to an imaging system; when a maximum image height of the lens assembly42is 2.5 millimeters, half of a maximum field of view (HFOV) is correspondingly 9.75 degrees, and the optical unit4is therefore a telephoto lens.

The fourth lens element440has an optical portion441, and the optical path401passes through the optical portion441. The fourth lens element440further has an optical surface442at an emitting side thereof. The optical surface442is a light-passable aspheric surface. The optical portion441passes through the optical surface442, and the optical portion441generates refraction on the optical surface442.

The light-blocking membrane layer490is surrounding and disposed adjacent to the optical portion441and is coated on the optical surface442of the fourth lens element440.

The light-blocking membrane layer490has a distal side491and a proximal side492. The proximal side492is located closer to the optical portion441than the distal side491. The proximal side492includes a plurality of extension structures4921and a plurality of recessed structures4922. The extension structures4921and the recessed structures4922are disposed on the optical surface442. Each of the extension structures4921extends along a direction away from the distal side491, and the extension structures4921are not overlapped with one another in a direction in parallel with the optical path401. The recessed structures4922are connected to and located between two adjacent extension structures4921and are recessed along a direction towards the distal side491.

The light-blocking membrane layer490further has a plurality of light-blocking areas493. The light-blocking areas493are spaced apart from one another and disposed on the optical surface442. The light-blocking areas493includes a plurality of first light-blocking areas4931and a plurality of second light-blocking areas4932, and the first light-blocking areas4931are located closer to the optical path401than the second light-blocking areas4932.

A thickness of the light-blocking membrane layer490gradually decreases from the recessed structures4922to the extension structures4921. In other words, a thickness of the light-blocking membrane layer490gradually increases from a side of the extension structures4921close to the optical path401towards the recessed structures4922. Also, a thickness of the first light-blocking areas4931is smaller than a thickness of the second light-blocking areas4932. It is noted that for clearly showing the coating range of the light-blocking membrane layer490, the light-blocking membrane layer490inFIG.36is not at its real scale.

When a shortest distance between the extension structures4921at a side farthest from the distal side491is ΔG, the following condition is satisfied: ΔG=83 [um].

When a shortest distance between the first light-blocking areas4931and rest areas of the light-blocking membrane layer490is D1, and a shortest distance between the second light-blocking areas4932and rest areas of the light-blocking membrane layer490is D2, the following conditions are satisfied: D1=27.5 [um]; D2=21.3 [um]; and D2/D1=0.775. When an average thickness of the light-blocking membrane layer490is T, the following condition is satisfied: 0.9 [um]≤T≤10 [um].

As shown in the cross-sectional view ofFIG.36, when a longest distance in parallel with the optical path401between the extension structures4921and the recessed structures4922is ΔH, the following condition is satisfied: ΔH=2.5 [um] while in the cross-sectional view ofFIG.36.

When a longest distance in parallel with the optical path401between the first light-blocking areas4931and the second light-blocking areas4932is ΔHs, the following condition can be satisfied: 0.5 [um]≤pHs≤249.5 [um].

Please refer toFIG.39toFIG.46, whereFIG.39is an isometric view of an optical unit according to the 5th embodiment of the present disclosure,FIG.40is an exploded view of the optical unit inFIG.39,FIG.41is another exploded view of the optical unit inFIG.39,FIG.42is an enlarged view of a fifth lens element of the optical unit inFIG.41,FIG.43is a side view of the fifth lens element inFIG.42,FIG.44is an image-side view of the fifth lens element inFIG.42,FIG.45is a cross-sectional view of the fifth lens element inFIG.44taken along line45-45, andFIG.46is an enlarged view of EE region of the fifth lens element inFIG.44.

In this embodiment, the optical unit5is an image lens. The optical unit5includes a carrier51, a lens assembly52and a filter53and has an image surface54. The carrier51accommodates the lens assembly52. The lens assembly52has an optical path501and includes, in order from an object side to an image side along the optical path501, a first lens element510, a second lens element520, a third lens element530, a fourth lens element540, a fifth lens element550, a light-blocking membrane layer590, a first spacer SP1, a sixth lens element560, a seventh lens element570, a second spacer SP2, an eighth lens element580and a retainer RT. The filter53is located at an image side of the lens assembly52. The image surface54is located at an image side of the filter53. Light will be converged and then image on the image surface54after passing through the lens assembly52. When a maximum image height of the lens assembly52is 8.2 millimeters (mm), half of a maximum field of view (HFOV) is correspondingly 42.5 degrees, and the optical unit5is therefore a wide-angle lens.

The fifth lens element550has an optical portion551, and the optical path501passes through the optical portion551. The fifth lens element550further has an optical surface552and a connection surface553at an image side thereof. The optical surface552is a light-passable aspheric surface. The optical portion551passes through the optical surface552, and the optical portion551generates refraction on the optical surface552. The connection surface553is connected to the optical surface552with a boundary BD therebetween.

The light-blocking membrane layer590is surrounding and disposed adjacent to the optical portion551and is coated on the optical surface552, the boundary BD and the connection surface553of the fifth lens element550so as to reduce stray light generated at the boundary BD and thus increase optical quality.

The light-blocking membrane layer590has a plurality of light-blocking areas593. The light-blocking areas593are spaced apart from one another and disposed on the optical surface552. The light-blocking areas593includes a plurality of first light-blocking areas5931and a plurality of second light-blocking areas5932, and the first light-blocking areas5931are located closer to the optical path501than the second light-blocking areas5932.

A thickness of the first light-blocking areas5931is smaller than a thickness of the second light-blocking areas5932. It is noted that for clearly showing the coating range of the light-blocking membrane layer590, the light-blocking membrane layer590inFIG.45is not at its real scale.

When a shortest distance between the first light-blocking areas5931and rest areas of the light-blocking membrane layer590is D1, and a shortest distance between the second light-blocking areas5932and rest areas of the light-blocking membrane layer590is D2, the following conditions are satisfied: D1=15.7 [um]; D2=4.45 [um]; and D2/D1=0.286.

When an average thickness of the light-blocking membrane layer590is T, the following condition is satisfied: 0.9 [um]≤T≤10 [um].

When a longest distance in parallel with the optical path501between the first light-blocking areas5931and the second light-blocking areas5932is ΔHs, the following condition can be satisfied: 0.5 [um]≤Hs≤249.5 [um].

Please refer toFIG.47toFIG.53, whereFIG.47is an isometric view of an optical unit according to the 6th embodiment of the present disclosure,FIG.48is an exploded view of the optical unit inFIG.47,FIG.49is another exploded view of the optical unit inFIG.47,FIG.50is an enlarged view of a first lens element of the optical unit inFIG.48,FIG.51is a side view of the first lens element inFIG.50,FIG.52is an object-side view of the first lens element inFIG.50, andFIG.53is a cross-sectional view of the first lens element inFIG.52taken along line53-53.

In this embodiment, the optical unit6is an image lens. The optical unit6includes a carrier61, a lens assembly62and a filter63and has an image surface64. The carrier61accommodates the lens assembly62. The lens assembly62has an optical path601and includes, in order from an object side to an image side along the optical path601, a light-blocking membrane layer690, a first lens element610, a second lens element620, a third lens element630, a fourth lens element640, a fifth lens element650, a first spacer SP1, a sixth lens element660, a seventh lens element670, a second spacer SP2, an eighth lens element680and a retainer RT. The filter63is located at an image side of the lens assembly62. The image surface64is located at an image side of the filter63. Light will be converged and then image on the image surface64after passing through the lens assembly62. When a maximum image height of the lens assembly62is 8.2 millimeters (mm), half of a maximum field of view (HFOV) is correspondingly 42.5 degrees, and the optical unit6is therefore a wide-angle lens.

The first lens element610has an optical portion611, and the optical path601passes through the optical portion611. The first lens element610further has an optical surface612and a connection surface613at an object side thereof. The optical surface612is a light-passable aspheric surface. The optical portion611passes through the optical surface612, and the optical portion611generates refraction on the optical surface612. The connection surface613is connected to the optical surface612with a boundary BD therebetween.

The light-blocking membrane layer690is surrounding and disposed adjacent to the optical portion611and is coated on the optical surface612, the boundary BD, the connection surface613, an outer diameter surface ODS and a non-optical-effect area (not numbered) at an image side of the first lens element610so as to reduce stray light generated at the boundary BD, the junction between the connection surface613and the outer diameter surface ODS, and the junction between the outer diameter surface ODS and the non-optical-effect area and thus increase optical quality.

The light-blocking membrane layer690has a distal side691and a proximal side692. The proximal side692is located closer to the optical portion611than the distal side691. The proximal side692includes a plurality of extension structures6921and a plurality of recessed structures6922. The extension structures6921and the recessed structures6922are disposed on the optical surface612. Each of the extension structures6921extends along a direction away from the distal side691, and the extension structures6921are not overlapped with one another in a direction in parallel with the optical path601. The recessed structures6922are connected to and located between two adjacent extension structures6921and are recessed along a direction towards the distal side691.

A thickness of the light-blocking membrane layer690gradually decreases from the recessed structures6922to the extension structures6921. In other word, a thickness of the light-blocking membrane layer690gradually increases from a side of the extension structures6921close to the optical path601towards the recessed structures6922. It is noted that for clearly showing the coating range of the light-blocking membrane layer690, the light-blocking membrane layer690inFIG.53is not at its real scale.

When a shortest distance between the extension structures6921at a side farthest from the distal side691is ΔG, the following condition is satisfied: ΔG=7 [um].

When an average thickness of the light-blocking membrane layer690is T, the following condition is satisfied: 0.9 [um]≤T≤10 [um].

As shown in the cross-sectional views ofFIG.53, when a longest distance in parallel with the optical path601between the extension structures6921and the recessed structures6922is ΔH, the following condition is satisfied: ΔH=1.25 [um] while in the cross-sectional view ofFIG.53.

Please refer toFIG.54toFIG.64, whereFIG.54is an isometric view of an optical unit according to the 7th embodiment of the present disclosure,FIG.55is an exploded view of the optical unit inFIG.54,FIG.56is an enlarged view of a reflection component of the optical unit inFIG.55,FIG.57is an isometric view of the reflection component inFIG.56with no light-blocking membrane layer coated thereon,FIG.58is an isometric view of the reflection component inFIG.56with a light-blocking membrane layer coated thereon,FIG.59is a side view of the reflection component inFIG.58,FIG.60is another side view of the reflection component inFIG.58,FIG.61is a cross-sectional view of the reflection component inFIG.56taken along line61-61,FIG.62is an enlarged view of FF region of the reflection component inFIG.61,FIG.63is a cross-sectional view of the reflection component inFIG.56taken along line63-63, andFIG.64is an enlarged view of GG region of the reflection component inFIG.63.

In this embodiment, the optical unit7is an image lens. The optical unit7includes a carrier71, a lens assembly72and a supporter ST and has an image surface74. The carrier71accommodates the lens assembly72. The lens assembly72has an optical path701and includes, in order from an object side to an image side along the optical path701, a first lens element710, a first spacer SP1, a second spacer SP2, a second lens element720, a third spacer SP3, a third lens element730, a fourth spacer SP4, a fourth lens element740, a retainer RT, a reflection component750and a light-blocking membrane layer790. The supporter ST is located closer to the image side than part of the reflection component750and is used for the reflection component750to abut thereon. The image surface74is located at an image side of the reflection component750. Light will be reflected by the reflection component750after passing through the lens assembly72and then will be converged and image on the image surface74.

The reflection component750has an optical portion751, and the optical path701passes through the optical portion751. The reflection component750further has, in order from the object side to the image side along the optical path701, an incident surface756, a first reflection surface757a, a second reflection surface757b, a third reflection surface757c, a fourth reflection surface757dand an emitting surface758, and the optical portion751generates reflection on the first reflection surface757ato the fourth reflection surface757d. The incident surface756and the emitting surface758can be light-passable aspheric surfaces so as to provide a light convergence function or a light divergence function and thus to reduce the quantity of the components in the lens assembly72.

The reflection component750further has two V-shaped grooves759. The V-shaped grooves759each have two light-blocking surfaces7591and a plurality of curved protrusions7592. In each V-shaped groove759, the light-blocking surfaces7591are gradually spaced apart from each other from the optical portion751along a direction away from the optical path701, and the curved protrusions7592are sequentially arranged and are connected to the light-blocking surfaces7591.

The light-blocking membrane layer790is disposed adjacent to the optical portion751and is coated on the light-blocking surfaces7591and the curved protrusions7592of the V-shaped grooves759of the reflection component750. Please refer toFIG.57toFIG.58, which show the steps before and after coating the light-blocking membrane layer790on the reflection component750.

The light-blocking membrane layer790has a distal side791and a proximal side792respectively at two ends thereof close to the V-shaped groove759. The proximal side792is located closer to the optical portion751than the distal side791. The proximal side792includes a plurality of extension structures7921and a plurality of recessed structures7922. The extension structures7921are disposed at a side of the V-shaped groove759close to the optical path701. Each of the extension structures7921extends along a direction away from the distal side791, and the extension structures7921are not overlapped with one another in a direction in parallel with the optical path701. The recessed structures7922are connected to and located between two adjacent extension structures7921and are recessed along a direction towards the distal side791. In this embodiment, the extension structures7921can also be disposed on at least one of the incident surface756, the first reflection surface757a, the second reflection surface757b, the third reflection surface757c, the fourth reflection surface757dand the emitting surface758based on actual requirements.

A thickness of the light-blocking membrane layer790gradually decreases from the recessed structures7922to the extension structures7921. In other words, a thickness of the light-blocking membrane layer790gradually increases from a side of the extension structures7921close to the optical path701towards the recessed structures7922. It is noted that for clearly showing the coating range of the light-blocking membrane layer790, the light-blocking membrane layer790on the V-shaped groove759inFIG.59toFIG.60is not at its real scale.

When a shortest distance between the extension structures7921at a side farthest from the distal side791is ΔG, the following condition is satisfied: ΔG=75 [um].

When an average thickness of the light-blocking membrane layer790is T, the following condition is satisfied: 0.9 [um]≤T≤10 [um].

Please refer toFIG.65toFIG.69, whereFIG.65is an isometric view of a reflection component of an optical unit according to the 8th embodiment of the present disclosure,FIG.66is a cross-sectional view of the reflection component inFIG.65taken along line66-66,FIG.67is an enlarged view of HH region of the reflection component inFIG.66,FIG.68is a cross-sectional view of the reflection component inFIG.65taken along line68-68, andFIG.69is an enlarged view of II region of the reflection component inFIG.68.

Note that this embodiment is similar to the 7th embodiment, and only differences between this and the 7th embodiments will be illustrated.

The shapes of the curved protrusions8592of this embodiment are different from that of the curved protrusions7592of the 7th embodiment, such that the shape of the light-blocking membrane layer890coated on the curved protrusions8592is also different from that of the 7th embodiment, thereby causing the shapes of the extension structures8921and the recessed structures8922are also different from that of the 7th embodiment.

When a shortest distance between the extension structures8921at a side farthest from the distal side891is ΔG, the following condition is satisfied: ΔG=0.15 [um].

Please refer toFIG.70toFIG.72, whereFIG.70is an isometric view of an electronic device according to the 9th embodiment of the present disclosure,FIG.71is another isometric view of the electronic device inFIG.70, andFIG.72is a block diagram of the electronic device inFIG.70.

In this embodiment, an electronic device9is a mobile device such as a computer, a smartphone, a smart wearable device, a camera drone, and a driving recorder and displayer, but the present disclosure is not limited thereto. The electronic device9includes an optical unit9a, an optical unit9b, an optical unit9c, an optical unit9d, an optical unit9e, an optical unit9f, an optical unit9g, an optical unit9h, a flash module92, a focus assist module93, an image signal processor, a display module95, an image software processor, a biometric identification device97and image sensor(s).

Each of the optical unit9a, the optical unit9b, the optical unit9c, the optical unit9d, the optical unit9e, the optical unit9f, the optical unit9gand the optical unit9hcan include one of the lens assemblies12-72abovementioned in the 1st to the 7th embodiments, and the image sensor(s) can be disposed on one of the image surfaces14-24and54-74of the lens assemblies12-22and52-72for converting an optical signal into an electric signal.

The optical unit9a, the optical unit9b, the optical unit9c, the optical unit9dand the optical unit9eare disposed on the same side of the electronic device9. The optical unit9f, the optical unit9g, the optical unit9hand the display module95are disposed on the opposite side of the electronic device9. The display module95can be a user interface, so that the optical units9f,9gand9hcan be front-facing cameras of the electronic device9for taking selfies, but the present disclosure is not limited thereto.

The optical unit9ais an ultra-telephoto image capturing module, the optical unit9bis a macro-photo image capturing module, the optical unit9cis a wide-angle image capturing module, the optical unit9dis an ultra-wide-angle image capturing module, the optical unit9eis a telephoto image capturing module, the optical unit9fis an ultra-wide-angle image capturing module, the optical unit9gis a wide-angle image capturing module, and the optical unit9his a ToF (time of flight) image capturing module. In this embodiment, the optical unit9a, the optical unit9b, the optical unit9c, the optical unit9dand the optical unit9ehave different fields of view, such that the electronic device9can have various magnification ratios so as to meet the requirement of optical zoom functionality. For example, the ultra-wide-angle image capturing module9dwith the maximum field of view ranging between 105 degrees and 125 degrees can achieve an image with an equivalent focal length between 11 mm and 14 mm. In this case, the image captured by the ultra-wide-angle image capturing module9dcan refer toFIG.73, which shows an image captured by the electronic device9with an equivalent focal length ranging between 11 mm and 14 mm, and the captured image as shown inFIG.73includes the whole cathedral, surrounding buildings and people on the square. The captured image as shown inFIG.73has a relatively large field of view and depth of view, but it often has a relatively large degree of distortion. The wide-angle image capturing module9cwith the maximum field of view ranging between 70 degrees and 90 degrees can achieve an image with an equivalent focal length between 22 mm and 30 mm. In this case, the image captured by the wide-angle image capturing module9ccan refer toFIG.74, which shows an image captured by the electronic device9with an equivalent focal length ranging between 22 mm and 30 mm, and the captured image as shown inFIG.74includes the whole cathedral and people in front of the cathedral. The zoom-telephoto image capturing module9ewith the maximum field of view ranging between 10 degrees and 40 degrees can achieve an image with an equivalent focal length between 60 mm and 300 mm, and the zoom-telephoto image capturing module9ecan be regarded as able to provide 5× magnification. In this case, the image captured by the zoom-telephoto image capturing module9ecan refer toFIG.75, which shows an image captured by the electronic device9with an equivalent focal length ranging between 60 mm and 300 mm, and the captured image as shown inFIG.75includes the birds flying in front of the cathedral. The captured image as shown inFIG.75has a relatively small field of view and depth of view, and the zoom-telephoto image capturing module9ecan be used for shooting moving targets. For this, an optical element driving unit (not shown) can drive the lens assembly to quickly and continuously autofocus on the target, such that the captured image of the target would not be blurred due to long focusing distance. When imaging, the zoom-telephoto image capturing module9ecan further perform optical zoom for imaged objects so as to obtain clearer images. Said magnification ratio of one optical unit is defined as a ratio of the maximum focal length to the minimum focal length of the optical unit. For instance, the magnification ratio of the zoom-telephoto image capturing module9eis 5× magnification. The ultra-telephoto image capturing module9awith the maximum field of view ranging between 4 degrees and 8 degrees can achieve an image with an equivalent focal length between 400 mm and 600 mm. In this case, the image captured by the ultra-telephoto image capturing module9acan refer toFIG.76, which shows an image captured by the electronic device9with an equivalent focal length ranging between 400 mm and 600 mm, and the captured image as shown inFIG.76includes the angel-and-cross-topped spire of the cathedral. The captured image as shown inFIG.76has a further smaller field of view and depth of view, and the lens assembly of the ultra-telephoto image capturing module9amay easily capture an out of focus image due to slight camera shake. For this, the optical element driving unit can provide a feedback force to correct the shake so as to achieve optical image stabilization while providing a force to drive the lens assembly of the ultra-telephoto image capturing module9ato focus on a target. In addition, the optical unit9hcan determine depth information of the imaged object. In this embodiment, the electronic device9includes multiple optical unit9a,9b,9c,9d,9e,9f,9gand9h, but the present disclosure is not limited to the number and arrangement of optical units. The equivalent focal lengths to which the abovementioned optical units correspond are estimated values based on particular conversion functions, and the estimated values may be different from actual focal lengths of the optical unit due to designs of the lens assemblies and sizes of the image sensors.

When a user captures images of an object OBJ, light rays converge in the optical unit9a, the optical unit9b, the optical unit9cor the optical unit9eto generate images, and the flash module92is activated for light supplement. The focus assist module93detects the object distance of the imaged object OBJ to achieve fast auto focusing. The image signal processor is configured to optimize the captured image to improve image quality. The light beam emitted from the focus assist module93can be either conventional infrared or laser.

In addition, the light rays may converge in the optical unit9f,9gor9hto generate images. The electronic device9can include a reminder light9kthat can be illuminated to remind the user that the optical unit9f,9gor9hof the electronic device9is working. The display module95can be a touch screen or physical buttons such as a zoom button951and a shutter release button952. The user is able to interact with the display module95and the image software processor having multiple functions to capture images and complete image processing. The image processed by the image software processor can be displayed on the display module95. The user can replay the previously captured image through an image playback button953of the display module95, can choose a suitable optical unit for shooting through an optical units switching button954of the display module95, and can properly adjust shooting parameters according to current shooting situations through an integrated menu button955of the display module95.

When the lens assembly in the optical unit9a, the optical unit9b, the optical unit9c, the optical unit9d, the optical unit9e, the optical unit9f, the optical unit9gor the optical unit9his applied to a projection system, a light source LS can be disposed at the incident side of the lens assembly, such that the electronic device9can be used as a projector, which can refer toFIG.77andFIG.78showing application scenarios of the electronic device9as a projector. One or more among the optical unit9a, the optical unit9b, the optical unit9c, the optical unit9d, the optical unit9e, the optical unit9f, the optical unit9gand the optical unit9hcan be used as a projection lens module PLM to project an image source IMS to a plane or human's eyes via the abovementioned lens assembly and an image transmission module ITM, wherein the image transmission module ITM can be a waveguide or an optical path folding lens assembly, but the present disclosure is not limited thereto.

Further, the electronic device9further includes a circuit board98and a plurality of electronic components99disposed on the circuit board98. The optical unit9a,9b,9c,9d,9e,9f,9g, and9hare electrically connected to the electronic components99via connectors981on the circuit board98. The electronic components99can include a signal emitting module and can transmit image(s) to other electronic device or a cloud storage via the signal emitting module. The signal emitting module can be a wireless fidelity (WiFi) module, a Bluetooth module, an infrared module, a network service module or an integrated module for transmitting various signals mentioned above, but the present disclosure is not limited thereto.

The electronic components99can also include a storage unit, a random access memory for storing image information, a gyroscope, and a position locator for facilitating the navigation or positioning of the electronic device9. In this embodiment, the image signal processor, the image software processor and the random access memory are integrated into a single chip system94, but the present disclosure is not limited thereto. In some other embodiments, the electronic components can also be integrated in the optical unit or can also be disposed on one of the circuit boards. In addition, the user can use the biometric identification device97to turn on and unlock the electronic device9.

The smartphone in this embodiment is only exemplary for showing the lens assembly and the optical unit of the present disclosure installed in an electronic device, and the present disclosure is not limited thereto. The lens assembly and the optical unit can be optionally applied to optical systems with a movable focus. Furthermore, the lens assembly and the optical unit feature good capability in aberration corrections and high image quality, and can be applied to 3D (three-dimensional) image capturing applications, in products such as digital cameras, mobile devices, digital tablets, smart televisions, network surveillance devices, dashboard cameras, vehicle backup cameras, multi-camera devices, image recognition systems, motion sensing input devices, wearable devices and other electronic imaging devices. The foregoing description, for the purpose of explanation, has been described with reference to specific embodiments. It is to be noted that the present disclosure shows different data of the different embodiments; however, the data of the different embodiments are obtained from experiments. The embodiments were chosen and described in order to best explain the principles of the disclosure and its practical applications, to thereby enable others skilled in the art to best utilize the disclosure and various embodiments with various modifications as are suited to the particular use contemplated. The embodiments depicted above and the appended drawings are exemplary and are not intended to be exhaustive or to limit the scope of the present disclosure to the precise forms disclosed. Many modifications and variations are possible in view of the above teachings.