TWI755297B - Switchable lens module and sensing device - Google Patents

Abstract

A switchable lens module including a switch mechanism, a positive lens, a non-visible light filter, and a light transmission assembly is provided. The positive lens is fixed at a first position of the switch mechanism. The non-visible light filter is fixed at a second position of the switch mechanism. The light transmission assembly is disposed at a side of the switch mechanism. The first position and the second position respectively cut into a light entrance end of the light transmission assembly in a first mode and a second mode of the switchable lens module. A sensing device is also provided.

Description

Switchable lens module and sensing device

The present invention relates to a lens module and an electronic device, and more particularly, to a switchable lens module and a sensing device.

The transmission path of light is related to the refractive index of the material, and the same material has different refractive indices for light in different wavelength bands. Therefore, it is difficult for a sensing device using a single lens module to take into account the imaging quality of light in different wavelength bands. For example, a sensing device with good imaging in the visible light band may have a defocus phenomenon in the infrared light band, and a sensing device with good imaging in the infrared light band may have a defocus phenomenon in the visible light band.

The present invention provides a switchable lens module and a sensing device, which can take into account the imaging quality of different wavelength bands.

A switchable lens module of the present invention includes a switching mechanism, a positive lens, a non-visible light filter and a light transmission component. The positive lens is fixed at the first position of the switching mechanism. The invisible light filter is fixed at the second position of the switching mechanism. The light transfer assembly is provided on one side of the switching mechanism. The first position and the second position respectively cut into the light incident end of the light transmission component in the first mode and the second mode of the switchable lens module.

A sensing device of the present invention includes a switchable lens module and a sensor. The switchable lens module includes a switching mechanism, a positive lens, a non-visible light filter and a light transmission component. The positive lens is fixed at the first position of the switching mechanism. The invisible light filter is fixed at the second position of the switching mechanism. The light transfer assembly is provided on one side of the switching mechanism. The first position and the second position respectively cut into the light incident end of the light transmission component in the first mode and the second mode of the switchable lens module. The sensor is arranged on the image side of the light transfer assembly.

In order to make the above-mentioned features and advantages of the present invention more obvious and easy to understand, the following embodiments are given and described in detail with the accompanying drawings as follows.

Directional terms mentioned herein, such as "up", "down", "front", "rear", "left", "right", etc., only refer to the directions of the drawings. Accordingly, the directional terms used are intended to illustrate rather than limit the present invention.

In the drawings, each figure illustrates the general characteristics of methods, structures or materials used in particular embodiments. However, these drawings should not be construed to define or limit the scope or nature encompassed by these embodiments. For example, the relative sizes, thicknesses and positions of various layers, regions or structures may be reduced or exaggerated for clarity.

Terms such as "first" and "second" mentioned in this specification or the scope of the patent application are only used to name different elements or to distinguish different embodiments or ranges, and are not used to limit the upper or lower limit of the number of elements, nor Used to define the order of manufacture or arrangement of components. Furthermore, the disposition of an element/film layer on (or over) another element/film layer may encompass that the element/film layer is disposed directly on (or over) the other element/film layer, and both elements/film layers are disposed directly on (or over) the other element/film layer. The case where the film layers are in direct contact; and the element/film layer is indirectly disposed on (or over) the other element/film layer, and there is one or more elements/film layers between the two elements/film layers. condition.

1 and 2 are schematic diagrams of a sensing device in a first mode and a second mode, respectively, according to an embodiment of the present invention. FIG. 3 is a schematic top view of the switching mechanism in FIGS. 1 and 2 . FIG. 4 is a graph showing the relationship between wavelength and light transmittance of the dual-band pass filter in FIGS. 1 and 2 .

In the embodiment of the present invention, the sensing device can be applied to electronic devices such as mobile phones, tablets, notebook computers, or spliced displays to provide functions such as photographing or photography, but not limited thereto. The sensing device is suitable for capturing light in different wavelength bands, such as visible light (wavelengths fall within the range of 400 nm to 700 nm, for example) and invisible light. Invisible light may include infrared light (with wavelengths in the range of, for example, 850 nm to 1050 nm), but is not limited thereto.

Referring to FIGS. 1 to 3 , the sensing device 1 may include a switchable lens module 10 and a sensor 12 , but is not limited thereto. The sensing device 1 can add or subtract one or more elements according to requirements.

The switchable lens module 10 may include a switching mechanism 100 , a positive lens 102 , a non-visible light filter 104 and a light transmission component 106 , but is not limited thereto. The switchable lens module 10 can add or subtract one or more components according to requirements.

The switching mechanism 100 can be used to fix the positive lens 102 and the non-visible light filter 104 . For example, the positive lens 102 can be fixed at the first position P1 of the switching mechanism 100 , and the non-visible light filter 104 can be fixed at the second position P2 of the switching mechanism 100 .

In some embodiments, as shown in FIG. 3 , the switching mechanism 100 may include a dial RP. The turntable RP may include a first opening A1 at the first position P1 and a second opening A2 at the second position P2, and the positive lens 102 and the non-visible light filter 104 may be respectively fixed to the first opening A1 and the second opening A2. 2. Opening A2. For example, the positive lens 102 and the non-visible light filter 104 can be embedded in the first opening A1 and the second opening A2, respectively. Alternatively, the positive lens 102 and the non-visible light filter 104 can be respectively fixed to the turntable RP through a fixing element or an adhesive layer, wherein the first opening A1 exposes at least the optically effective area of the positive lens 102, and the second opening A2 At least the filter region of the invisible light filter 104 is exposed.

The turntable RP may have a rotation axis AX. The turntable RP is adapted to rotate around the rotation axis AX, so that the positions of the positive lens 102 and the non-visible light filter 104 relative to the light transmission component 106 can be changed according to the mode of the switchable lens module 10 .

In detail, the switchable lens module 10 may include a first mode (refer to FIG. 1 ) and a second mode (refer to FIG. 2 ). The first mode is, for example, an infrared light mode, and the second mode is, for example, a visible light mode. When the switchable lens module 10 is switched between the first mode and the second mode, the turntable RP can be rotated, so that the positive lens 102 and the non-visible light filter 104 are rotated correspondingly. The light transmission assembly 106 is disposed on one side of the switching mechanism 100, and the position of the light transmission assembly 106 does not change during the rotation of the turntable RP. Therefore, the positions of the positive lens 102 and the non-visible light filter 104 relative to the light transmitting element 106 can be controlled by rotating the turntable RP. For example, when the switchable lens module 10 is switched to the first mode, the positive lens 102 (the first position) can be cut into the light incident end X1 of the light transmission component 106 by the rotation of the switching mechanism 100, and the invisible light filter 104 is moved out of the light input end X1 of the light transmission assembly 106 . On the other hand, when the switchable lens module 10 is switched to the second mode, the non-visible light filter 104 (the second position) can be cut into the light incident end X1 of the light transmission component 106 by the rotation of the switching mechanism 100 , And the positive lens 102 is moved out of the light incident end X1 of the light transmission component 106 .

It should be understood that FIG. 3 only schematically illustrates one example of the switching mechanism 100 , and is not used to limit the specific implementation of the switching mechanism 100 . In other not-shown embodiments, the switching mechanism 100 may include any component suitable for driving the positive lens 102 and the invisible light filter 104 to rotate or move.

The positive lens 102 has positive refractive power. In some embodiments, the positive lens 102 may include an aspherical lens, but is not limited thereto. In other embodiments, the positive lens 102 may comprise a spherical lens.

The non-visible light filter 104 may be used to filter non-visible light and pass visible light. For example, the non-visible light filter 104 can be an infrared light filter, but not limited thereto.

Light delivery component 106 may be used to deliver light from positive lens 102 (eg, infrared light) in a first mode and light from non-visible light filter 104 (eg, visible light) to sensor 12 in a second mode. As shown in FIG. 1 and FIG. 2 , the light transmission component 106 may include a light-reflecting element R, a plurality of lenses (such as a first lens L1 , a second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5) and the dual-band pass filter F, but not limited thereto. The light delivery assembly 106 may have one or more elements added or removed as desired. For example, the light delivery assembly 106 may also include an aperture AS. The aperture AS is, for example, disposed between the third lens L3 and the fourth lens L4, but not limited thereto.

The reflective element R may include a flat mirror, a curved mirror, a mirror or any other element that can reflect light. The first lens L1 has negative refractive power and is, for example, a convex-concave lens with a concave surface facing the image side X2. The second lens L2 has positive refractive power and is, for example, a biconvex lens. The third lens L3 has negative refractive power and is, for example, a biconcave lens. The fourth lens L4 has negative refractive power and is, for example, a biconcave lens. The fifth lens L5 has positive refractive power and is, for example, a biconvex lens. The dual-band pass filter F is suitable for passing visible light as well as infrared light, as shown in FIG. 4 . In FIG. 4 , the solid line and the dashed line are the light transmittance curves of light with incident angles of 0 degrees and 30 degrees at different wavelengths, respectively.

The sensor 12 is disposed on the image side X2 of the light transfer assembly 106 . For example, the sensor 12 may include, but not limited to, a charge coupled device (CCD) image sensing element or a complementary metal-oxide semiconductor (CMOS) image sensing element. .

Tables 1 to 3 respectively illustrate an example of the sensing device 1 . However, the data listed in Tables 1 to 3 are not intended to limit the present disclosure. Anyone skilled in the art can make appropriate changes to the parameters or settings after referring to the present disclosure, but they should still fall within the scope of the present disclosure. Inside. Remark surface Radius of curvature (mm) Spacing(mm) refractive index Abbe number Target Unlimited Unlimited Optical element S1 V1 0.5 1.545 22.456 S2 V2 0.5 first lens L1 SL11 4.674 0.500 1.643 55.987 SL12 3.706 0.200 second lens L2 SL21 2.823 2.067 1.545 22.456 SL22 -56.438 0.210 third lens L3 SL31 -29.778 0.500 1.643 55.987 SL32 10.440 0.327 Aperture AS 2.081 Fourth lens L4 SL41 -7.330 0.500 1.545 22.456 SL42 7.832 0.915 Fifth lens L5 SL51 94.875 0.673 1.643 55.987 SL52 -12.176 4.117 Filter 9 S91 Unlimited 0.210 1.517 64.167 S92 Unlimited 0.400 sensor 10 S10 Unlimited 0.000 Table I

In Table 1, the optical element is the positive lens 102 in the first mode, and the optical element is the non-visible light filter 104 in the second mode. The surfaces S1, SL11, SL21, SL31, SL41, SL51, and SL91 are the objects of the optical element, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5 and the filter 9, respectively. side. Surfaces S2, SL12, SL22, SL32, SL42, SL52, and SL92 are the images of the optical element, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5 and the filter 9, respectively. side. The surface S10 is the photosensitive surface of the sensor. Spacing refers to the distance on the optical axis from the surface to the next surface. For example, the pitch of the surface SL11 being 0.500 means that the distance on the optical axis from the object side surface of the first lens L1 to the image side surface is 0.500 mm. Please refer to Table 3 for the specific values of the distance between the object side and the image side of the optical element in different modes.

其中，X為光軸I方向之偏移量。R是密切球面(osculating sphere)的半徑，也就是接近光軸處的曲率半徑。K為圓錐常數(conic constant)。H是非球面高度，即為從透鏡中心往透鏡邊緣的高度，從公式中可得知，不同的H會對應出不同的X值。A、B、C、D為非球面係數(aspheric coefficient)。在一實例中，各透鏡表面的K值皆為0，且非球面係數如表二所示： 表面 A B C D S1 V3 V4 V5 0 SL11 2.3541E-03 5.3575E-05 1.5475E-05 -3.2324E-06 SL12 1.7842E-03 2.4505E-04 -1.4663E-06 -7.1592E-06 SL21 -2.4966E-03 -7.3009E-05 -4.3004E-05 -7.9075E-06 SL22 -1.6816E-03 -3.3670E-04 -4.4044E-05 1.7422E-05 SL31 -7.3320E-04 -2.7732E-04 -6.2657E-05 9.6105E-06 SL32 1.8910E-03 -1.2740E-04 -5.9416E-05 -3.7417E-05 SL41 -2.0176E-02 -1.2294E-03 -1.1185E-03 -1.8770E-04 SL42 -1.3464E-02 5.9554E-04 -1.2772E-03 2.1733E-04 SL51 -1.6009E-02 -2.1528E-03 -5.1208E-04 1.9873E-04 SL52 -1.3686E-02 -1.8548E-03 -5.6134E-05 7.0756E-05 表二In an example, the first lens L1 to the fifth lens L5 are all aspherical lenses, and the object side and the image side of these lenses are all aspherical. In addition, the object side of the positive lens 102 may be spherical or aspheric, and the image side of the positive lens 102 may be spherical or flat. Both the object side and the image side of the invisible light filter 104 may be flat. The formula for an aspheric surface is as follows:

Wherein, X is the offset in the direction of the optical axis I. R is the radius of the osculating sphere, that is, the radius of curvature near the optical axis. K is the conic constant. H is the height of the aspheric surface, that is, the height from the center of the lens to the edge of the lens. It can be known from the formula that different H will correspond to different X values. A, B, C, and D are aspheric coefficients. In an example, the K value of each lens surface is 0, and the aspheric coefficients are shown in Table 2: surface A B C D S1 V3 V4 V5 0 SL11 2.3541E-03 5.3575E-05 1.5475E-05 -3.2324E-06 SL12 1.7842E-03 2.4505E-04 -1.4663E-06 -7.1592E-06 SL21 -2.4966E-03 -7.3009E-05 -4.3004E-05 -7.9075E-06 SL22 -1.6816E-03 -3.3670E-04 -4.4044E-05 1.7422E-05 SL31 -7.3320E-04 -2.7732E-04 -6.2657E-05 9.6105E-06 SL32 1.8910E-03 -1.2740E-04 -5.9416E-05 -3.7417E-05 SL41 -2.0176E-02 -1.2294E-03 -1.1185E-03 -1.8770E-04 SL42 -1.3464E-02 5.9554E-04 -1.2772E-03 2.1733E-04 SL51 -1.6009E-02 -2.1528E-03 -5.1208E-04 1.9873E-04 SL52 -1.3686E-02 -1.8548E-03 -5.6134E-05 7.0756E-05 Table II

In Table 2, please refer to Table 3 for the specific values of the aspheric coefficients A, B, and C on the object side of the optical element in different modes. First Mode: Positive Lens 102 (Spherical) First Mode: Positive Lens 102 (Aspherical) Second Mode: Invisible Light Filter 104 V1 50.2 1823.7 Unlimited V2 51.2 Unlimited Unlimited V3 0 -9.92E-07 0 V4 0 2.55E-07 0 V5 0 -1.42E-08 0 Table 3

According to the simulation results, in the second mode (visible light band), the modulus of optical transfer function (MTF) of the sensing device 1 with a maximum field of view of 100 lp/mm is about 62%, and in the first In one mode (in the infrared light band), the MTF of the maximum field of view at 100 lp/mm is about 45%, which means that the sensing device 1 has good imaging quality in both the visible light band and the infrared light band.

To sum up, in the embodiment of the present invention, the positive lens and the non-visible light filter are respectively cut into the light-incident end of the light transmission component by the switching mechanism in the first mode and the second mode, wherein in the second mode Next, the negative influence of stray light (non-visible light) on visible light imaging is improved by a non-visible light filter, and in the first mode, the out-of-focus problem is improved by a positive lens. Therefore, the sensing device can have good imaging quality in different wavebands (eg, visible light waveband and infrared light waveband).

Although the present invention has been disclosed above by the embodiments, it is not intended to limit the present invention. Anyone with ordinary knowledge in the technical field can make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, The protection scope of the present invention shall be determined by the scope of the appended patent application.

1: Sensing device 10: Switchable lens module 12: Sensor 100: Switch Mechanism 102: Positive Lens 104: Invisible light filter 106: Light Delivery Components A1: The first opening A2: The second opening AS: Aperture AX: Spindle F: Dual Band Pass Filter L1: first lens L2: Second lens L3: Third lens L4: Fourth lens L5: Fifth lens P1: first position P2: Second position R: Reflective element RP: Turntable X1: Incoming end X2: Image side

1 and 2 are schematic diagrams of a sensing device in a first mode and a second mode, respectively, according to an embodiment of the present invention. FIG. 3 is a schematic top view of the switching mechanism in FIGS. 1 and 2 . FIG. 4 is a graph showing the relationship between wavelength and light transmittance of the dual-band pass filter in FIGS. 1 and 2 .

1: Sensing device

10: Switchable lens module

12: Sensor

100: Switch Mechanism

102: Positive Lens

104: Invisible light filter

106: Light Delivery Components

AS: Aperture

F: Dual Band Pass Filter

L1: first lens

L2: Second lens

L3: Third lens

L4: Fourth lens

L5: Fifth lens

R: Reflective element

X1: Incoming end

X2: Image side

Claims (10)

A switchable lens module, comprising: a switching mechanism; a positive lens fixed at a first position of the switching mechanism; a non-visible light filter fixed at a second position of the switching mechanism; and a light transmission component arranged at the switching mechanism One side of the mechanism includes a plurality of lenses, all of which are aspherical lenses, wherein the first position and the second position cut into the light respectively in the first mode and the second mode of the switchable lens module The light incident end of the transmission component, wherein the object side of the positive lens away from the light transmission component is spherical or aspherical, and the image side of the positive lens close to the light transmission component is spherical or flat. The switchable lens module of claim 1, wherein the switching mechanism comprises a turntable, the turntable comprises a first opening at the first position and a second opening at the second position, and the positive lens and The invisible light filter is respectively fixed to the first opening and the second opening. The switchable lens module according to claim 1, wherein the positive lens is an aspherical lens. The switchable lens module of claim 1, wherein the first mode is an infrared light mode, the second mode is a visible light mode, and the non-visible light filter is an infrared light filter. The switchable lens module according to claim 4, wherein the light transmission component further comprises a reflective element and a dual-band pass filter, the reflective element, the lenses And the dual-band pass filters are sequentially arranged from the light incident end toward the image side of the light transmission component, and the dual-band pass filters are suitable for passing visible light and infrared light. A sensing device, comprising: a switchable lens module, including: a switching mechanism; a positive lens fixed at a first position of the switching mechanism; a non-visible light filter fixed at a second position of the switching mechanism; and light transmission The component is arranged on one side of the switching mechanism and includes a plurality of lenses, all of which are aspherical lenses, wherein the first position and the second position are in the first mode and the second mode of the switchable lens module In the mode, the light-incident ends of the light-transmitting component are respectively cut, wherein the object side of the positive lens away from the light-transmitting component is spherical or aspherical, and the image side of the positive lens close to the light-transmitting component is spherical or flat; and The sensor is arranged on the image side of the light transmission component. The sensing device of claim 6, wherein the switching mechanism comprises a turntable, the turntable comprises a first opening at the first position and a second opening at the second position, and the positive lens and the invisible light The filters are respectively fixed to the first opening and the second opening. The sensing device of claim 6, wherein the positive lens is an aspherical lens. The sensing device of claim 6, wherein the first mode is an infrared light mode, the second mode is a visible light mode, and the invisible light filter is an infrared light filter. The sensing device according to claim 9, wherein the light transmission component further comprises a reflective element and a dual-band pass filter, the reflective element, the lenses and the dual-band pass filter transmit the light from the light incident end toward the light The image sides of the components are arranged in sequence, and the dual-band pass filter is suitable for passing visible light and infrared light.

Images