CN114839645A - Time of flight TOF module and electronic equipment of making a video recording - Google Patents

Abstract

The application relates to a time of flight TOF module and electronic equipment of making a video recording, the module of making a video recording include the circuit board and set up transmission module and the receiving module at the circuit board upper surface, and the transmission module is including the light source that is used for emitting N bundle of some light and the projecting lens that is used for collimation and throws N bundle of some light, and the receiving module is used for receiving the degree of depth light signal of N returns and converts into the signal of telecommunication. The field angle FOV of the projection lens satisfies that FOV is more than 65 degrees and less than 80 degrees, the F number of the projection lens is less than 1.9, and the focal length is more than 1.2 and less than 1.4. Through the design of the projection lens, N beam spots emitted by the light source are directly projected to a target object at a preset field angle and strength after passing through the projection lens, without copying light signals and setting a light signal copying element, so that the cost is saved, the thickness of the whole camera shooting module is reduced, and the assembly difficulty of the camera shooting module is also reduced. Because the N beam spot light directly reaches the target object after passing through the projection lens, the light loss is reduced, and the utilization rate of the light source is improved.

Description

Time of flight TOF module and electronic equipment of making a video recording

Technical Field

The application relates to the technical field of electronic products, especially, relate to a time of flight TOF module and electronic equipment of making a video recording.

Background

The Time of Flight (TOF) camera module is a common depth camera module, and can be used for measuring depth of field (depth) or distance information, and can realize a three-dimensional imaging or distance detection function of an electronic device on a target object. The TOF camera module generally includes an optical signal transmitting (Tx) module and an optical signal receiving (Rx) module. An Optical signal transmitting module of an existing TOF camera module generally includes a transmitter chip, a collimating lens (collimator lens) and a Diffractive Optical Element (DOE), where the DOE is configured to copy a light beam transmitted by the transmitter chip by a certain multiple and then transmit the light beam outwards to form a speckle Optical signal in multiple regions, so as to expand a measurement range of the TOF camera module and improve measurement accuracy of depth measurement. However, the structure of the existing TOF is complex, the assembly difficulty is high, and the cost is high.

Disclosure of Invention

The application provides a time of flight TOF module and electronic equipment of making a video recording for simplify the structure of the module of making a video recording, when reducing the processing degree of difficulty, can also reduce cost.

The embodiment of the application provides a time of flight TOF module of making a video recording, it is used for throwing the speckle light array that N speckles are constituteed with target field angle target object, the module of making a video recording includes:

the circuit board at least comprises a first area and a second area which are not overlapped on the upper surface of the circuit board;

the emission module is arranged in the first area of the circuit board and comprises a light source and a projection lens, the light source is used for emitting N-beam spot light, and the field angle FOV of the projection lens meets the following requirements: 65 ° < FOV < 80 °, an F-number of the projection lens less than 1.9, a focal length 1.2 < F < 1.4, the projection lens for collimating and projecting the N beam spot lights to the target object to produce a speckle light array of the N speckles on the target object; and

and the receiving module is arranged in a second area of the circuit board and used for receiving the depth optical signals returned after the N speckle arrays irradiate the target object and converting the depth optical signals into electric signals.

In one possible embodiment, the projection lens satisfies: 0.1< | Y/(f × TTL) | <0.4, wherein f is the focal length of the projection lens, Y is the maximum object height of the projection lens, and TTL is the distance between the diaphragm surface and the imaging surface of the projection lens.

In one possible embodiment, the projection lens satisfies: 0.3< f/TTL <0.5, wherein f is the focal length of the projection lens, and TTL is the distance between the diaphragm surface and the imaging surface of the projection lens.

In one possible embodiment, the projection lens satisfies: 0.2< Y/TTL <0.4, wherein Y is the maximum object height of the projection lens, and TTL is the distance between the diaphragm surface and the imaging surface of the projection lens.

In one possible embodiment, the field angle FOV of the projection lens is 71.9 °.

In a possible embodiment, the F-number of the projection lens is equal to 1.76.

In a possible embodiment, the projection lens is provided with a diaphragm and a lens group in sequence from the imaging side to the light source side, the lens group comprising at least two lenses.

In one possible embodiment, the lens group includes a first lens, a second lens, and a third lens arranged in this order from an imaging side to a light source side;

the first lens is a lens with positive focal power, the imaging side of the first lens at the paraxial region is a concave surface, the light source side of the first lens at the paraxial region is a convex surface, and at least one surface of the two surfaces of the first lens is an aspheric surface;

the second lens is a lens with negative focal power, the second lens is a concave surface on the imaging side of a paraxial region, the second lens is a convex surface on the light source side of the paraxial region, and at least one of the two surfaces of the second lens is an aspheric surface;

the third lens is a lens with positive focal power, the image side of the third lens at the paraxial region is a convex surface, and at least one surface of the two surfaces of the third lens is an aspheric surface.

In a possible implementation manner, the camera module comprises a first lens barrel and a second lens barrel, and the receiving module comprises an image sensor chip, an imaging lens and a filter;

the first lens barrel is arranged in a first area of the circuit board, and the projection lens is fixed on the first lens barrel and arranged above the light source;

the second lens cone is arranged in a second area of the circuit board, the image sensor chip is accommodated in the second lens cone, the imaging lens is fixed in the second lens cone and arranged above the image sensor chip and used for imaging the depth light signal to the image sensor chip, and the optical filter is positioned between the imaging lens and the image sensor chip.

In a possible implementation manner, the camera module further includes a ceramic substrate, the light source is disposed on the prime number circuit board through the ceramic substrate, and a projection area of the ceramic substrate on an upper surface of the circuit board is smaller than an area of the upper surface.

In one possible embodiment, the first barrel is mounted to the circuit board through the ceramic substrate.

In a possible implementation manner, the camera module further includes a driving member, and the driving member is mounted on the circuit board and is used for driving the light source to emit light.

In one possible embodiment, the driving member is mounted on the circuit board through a ceramic substrate, and the driving member and the light source are located on the same side of the ceramic substrate.

In a possible embodiment, the circuit board has a lower surface opposite to the upper surface, the lower surface being provided with a recess recessed in the direction of the upper surface, at least part of the drive element being located in the recess.

In one possible embodiment, the lower surface of the circuit board is provided with a stiffener.

The present application further provides an electronic device, including:

the time of flight TOF camera module of any of the above, the time of flight TOF camera module is for measuring depth information of a target object;

and the control unit is used for carrying out operation control on at least one function of the electronic equipment according to the depth information.

The application relates to a time of flight TOF module and electronic equipment of making a video recording, the module of making a video recording include the circuit board and set up transmission module and the receiving module at the circuit board upper surface, and the transmission module is including the light source that is used for emitting N bundle of some light and the projecting lens that is used for collimation and throws N bundle of some light, and the receiving module is used for receiving the degree of depth light signal of N returns and converts into the signal of telecommunication. Wherein, the field angle FOV of the projection lens satisfies that the FOV is more than 65 degrees and less than 80 degrees, the F number of the projection lens is less than 1.9, and the focal length is more than 1.2 and less than 1.4. Through the design of the projection lens, N beam spots emitted by the light source are directly projected to a target object at a preset field angle and strength after passing through the projection lens, without copying light signals and setting a light signal copying element, so that the cost is saved, the thickness of the whole camera shooting module is reduced, and the assembly difficulty of the camera shooting module is also reduced. Furthermore, because the N-beam spot light directly reaches the target object after passing through the projection lens, the light loss is reduced, and the utilization rate of the light source is greatly improved.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

Drawings

Fig. 1 is a schematic structural diagram of a camera module provided in the present application;

fig. 2 is a schematic view of an internal structure of a camera module according to a first embodiment of the present disclosure;

fig. 3 is a schematic view of a projection lens provided in the present application;

fig. 4 is a schematic internal structure diagram of a camera module according to a second embodiment of the present application;

fig. 5 is a schematic internal structural diagram of a camera module according to a third embodiment of the present application;

fig. 6 is a schematic structural diagram of a circuit board and a stiffener plate provided in the present application.

Reference numerals:

1-a transmitting module;

11-a light source;

12-a projection lens;

121-diaphragm;

122-a first lens;

123-a second lens;

124-a third lens;

13-a first barrel;

2-a receiving module;

21-a second barrel;

22-an image sensor chip;

23-an imaging lens;

24-an optical filter;

3-a circuit board;

31-a recess;

4-a ceramic substrate;

5-a driving member;

6-reinforcing plate.

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.

Detailed Description

For better understanding of the technical solutions of the present application, the following detailed descriptions of the embodiments of the present application are provided with reference to the accompanying drawings.

It should be understood that the embodiments described are only a few embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The terminology used in the embodiments of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the examples of this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

It should be noted that the directional terms such as "upper", "lower", "left", "right", etc. described in the embodiments of the present application are described in the angles shown in the drawings, and should not be construed as limiting the embodiments of the present application. In addition, in this context, it will also be understood that when an element is referred to as being "on" or "under" another element, it can be directly on "or" under "the other element or be indirectly on" or "under" the other element via an intermediate element.

As shown in fig. 1 and fig. 2, the embodiment of the present application provides a time of flight TOF camera module, the camera module includes a circuit board 3, a transmitting module 1 and a receiving module 2, the circuit board 3 has an upper surface and a lower surface arranged along a thickness direction thereof, wherein the upper surface is provided with a first region and a second region which are not overlapped with each other, the transmitting module 1 is arranged in the first region, the transmitting module 1 includes a light source 11 and a projection lens 12, the light source 11 is used for transmitting N beam spot lights, and specific numerical values of N can be set according to actual requirements. The projection lens 12 is used for processing the light signal emitted from the light source 11 into a speckle light signal. The Light source 11 may be a Vertical Cavity Surface Emitting Laser (VCSEL), a Light Emitting Diode (LED), or the like, or an array formed by combining a plurality of Light sources 11, where the Light source 11 may be a single-chip VCSEL chip Emitting Light at multiple points, and multiple Light Emitting points are arranged in a two-dimensional matrix and correspondingly emit multiple Laser signals to form a matrix-type optical signal array. The projection lens 12 is used to collimate the N beams of spot light and transmit the N beams of spot light to a target object, producing a speckle light array consisting of N speckles on the target object. The receiving module 2 is arranged in a second area of the circuit board 3 and used for receiving depth optical signals returned after the N speckle optical arrays irradiate the target object and converting the depth optical signals into electric signals. Wherein, the Field of View (FOV) of the projection lens 12 satisfies: FOV is more than 65 degrees and less than 80 degrees, the F number of the projection lens is less than 1.9, and the focal length is more than 1.2 and less than 1.4.

Field of View (FOV): the field of view range of the lens is characterized, and the larger the FOV of the lens is, the larger the range of the projected field of view of the lens is.

Distortion: the method is used for measuring the visual distortion degree of the image, and the smaller the distortion is, the better the imaging effect is.

Relative Illuminance (RI): the ratio of the illumination of different coordinate points on an imaging surface to the illumination of a central point is indicated, the smaller the relative illumination is, the more uneven the illumination of the imaging surface is, and the problem of underexposure or central overexposure of certain positions is easily caused, so that the imaging quality is influenced; the greater the relative illuminance, the higher the imaging quality.

Working F-number, or F-number (Fno): the reciprocal of the relative aperture of the lens is used for representing the light quantity which enters the photosensitive chip through the lens. The smaller the F number, the more the amount of light entering the lens.

In general, the diameter and the divergence angle of a light beam in a dimming system can be changed by a collimating lens in the conventional TOF module, so that the light beam is changed into a collimated parallel light beam, the energy of the light beam is more concentrated, and a fine high-power-density light spot can be obtained. When a speckle optical signal needs to be obtained, an optical replication element is further added above the collimating lens, so that the collimated optical signal is replicated to obtain the speckle optical signal. Alternatively, the Optical signal replication element may be at least one or a combination of Diffractive Optical Elements (DOE), Micro Lens Array (MLA), grating, or any other Optical element that can form spot light. The DOE is usually made of glass or plastic material, and is used for projecting a light beam emitted by a light source outwards to form a speckle optical signal of a plurality of areas after being copied by a certain multiple. Taking the DOE as an example, the optical signals are copied by the DOE to increase the number of the optical signals, so that the requirement of the receiving module 2 on the number of the optical signals is met, and the accuracy of measurement is improved. For example, the array optical signal emitted by the emitter chip includes n optical signals, the replication multiple of the DOE is m, n × m optical signals are formed after the replication of the DOE, and the receiving module 2 can receive the n × m optical signals returned from the target object, so that the accuracy of measurement is improved. However, when light passes through the DOE, energy loss of more than 10% is generated, the optical efficiency of the conventional emission module 1 including the collimating lens and the diffractive optical element is generally 56%, the F number is 2.83, the transmittance of the light is low, so the power of the TOF module needs to be increased, the single-hole optical power requirement is generally 100mW, a boost circuit (boost circuit) needs to be arranged under normal conditions, and the safety of the TOF module can be lowered along with the increase of the power, when the TOF module is damaged, the light emitted by the emitter chip is directly irradiated, which is easy to cause damage to a human body, so an Indium Tin Oxide (ITO) protection circuit needs to be arranged, and the protection circuit needs to include parts such as metal shrapnels as positive and negative electrodes, which increases the number of the whole parts of the TOF module, and has a complex structure, high assembly difficulty and high material cost.

Compared with the prior art that the optical signal is processed into the collimated optical signal, the scheme provided by the embodiment of the application can process the optical signal emitted by the light source 11 through the projection lens 12 to enable the optical signal to form the speckle optical array, and can increase the irradiation range of a single optical signal to a certain extent, so that the processed optical signal can meet the use requirement, thereby saving an optical signal replication element, and therefore, the loss of the optical signal during propagation can be reduced, thereby being beneficial to improving the optical efficiency, the optical efficiency can reach 80%, because the optical efficiency is higher, the single-hole optical power can be reduced, usually being reduced to 7mW, thereby saving a booster circuit, simplifying the structure of the TOF module, and simultaneously because the single-hole optical power is reduced, the safety of the TOF module is also improved, and related components of a protection circuit and a protection circuit can be saved, can also reduce the equipment degree of difficulty when simplifying TOF module structure to the cost that can reduce the material accords with actual user demand more.

Through the design of the projection lens 12, after passing through the projection lens 12, the N beam spot light emitted by the light source 11 is directly projected onto a target object at a preset field angle and intensity without copying a light signal and setting a light signal copying element, so that the cost is saved, the thickness of the whole camera module is reduced, and the assembly difficulty of the camera module is also reduced. Since the N beam spot light directly reaches the target object after passing through the projection lens 12, the light loss is reduced, and the utilization rate of the light source 11 is improved.

The transmission module 1 and the receiving module 2 share a circuit board 3, and set up on the same surface, can refer to common datum point or cross reference when the installation, be favorable to reducing the counterpoint tolerance between transmission module 1 and the receiving module 2, can reduce the optical axis of transmission module 1 and the relative optical axis contained angle of receiving module 2, can promote the imaging function or the distance detection function of the module of making a video recording, simultaneously can also reduce circuit board 3's cost, transmission module 1 and receiving module 2 no longer need the metal support at the in-process of equipment, not only be favorable to reducing the support cost of the module of making a video recording, can also save the assembly process flow of extra metal support, be favorable to reducing the assembly process cost of the module of making a video recording.

In one possible embodiment, the projection lens 12 can be designed to have a larger field angle FOV and a smaller F-number by designing the parameters of the projection lens 12. f is the focal length of the projection lens 12, Y is the maximum image height on the image plane of the image pickup module, and TTL is the distance between the diaphragm 121 and the light source 11. For example, 0.1< | Y/(f × TTL) | <0.4 may be satisfied between f, Y, and TTL.

The F, Y and TTL of the projection lens 12 influence the FOV and F number of the projection lens, and the F, Y and TTL are also mutually restricted and influenced, so that the projection lens 12 can obtain a larger wide-angle view field and detect a larger range by controlling the F, Y and TTL to meet the preset conditions, and the projection lens 12 can have a smaller F number, so that more light rays of a mobile phone can be obtained, and the performance of the lens can be improved.

When the relationship between F, Y and TTL of the projection lens is 0.1< | Y/(F × TTL) | <0.4, the FOV of the projection lens 12 satisfies 60 ° < FOV < 85 °, further, the FOV of the projection lens 12 may satisfy 65 ° < FOV < 85 °, 65 ° < FOV < 80 °, 65 ° < FOV < 75 ° or 65 ° < FOV < 70 ° and the like, so as to achieve the balance between the accuracy requirement of the depth detection and the field of view requirement, when the relationship between F, Y and TTL of the projection lens 12 is 0.1< | Y/(F × TTL) | <0.4, the F number of the projection lens 12 is less than 1.9, further, the F number of the projection lens 12 may satisfy: f-number less than 1.8, etc., to enable the projection lens 12 to collect more light.

It should be understood that the preset conditions mentioned above are conditions that should be satisfied by F, Y, and TTL of the projection lens 12 when the projection lens 12 is designed, so as to improve the projection performance of the projection lens 12 while ensuring the required FOV and F number, and in some cases, in order to obtain better projection performance, the preset conditions may be appropriately adjusted, for example, the preset conditions may be adjusted as follows: 0.1< | Y/(f × TTL) | <0.30, 0.2< | Y/(f × TTL) | <0.30, 0.1< | Y/(f × TTL) | <0.25, 0.15< | Y/(f × TTL) | <0.30, or 0.15< | Y/(f × TTL) | <0.25, and the like.

In a possible embodiment, f, Y and TTL of the projection lens 12 may also satisfy: 0.3< f/TTL <0.5, 0.2< Y/TTL < 0.4.

By further limiting the parameters of the projection lens 12, it is possible to make the FOV of the projection lens 12 as large as possible within the above-mentioned range thereof, and to make the F-number of the projection lens as small as possible within the above-mentioned range thereof. The preset conditions can be further adjusted as follows: 0.3< f/TTL <0.46, 0.4< f/TTL <0.46, 0.2< Y/TTL <0.35, 0.25< Y/TTL <0.35, or 0.2< Y/TTL <0.3, etc.

In a possible embodiment, the parameters of the projection lens 12 may be satisfied by limiting the above parameters: FOV 71.9 °, F number 1.76.

The camera module that this application embodiment provided has less F number and great angle of vision FOV, can improve camera module's optical efficiency to and the transmissivity of light. The transmittance of the existing TOF module (including DOE) is usually 56%, while the transmittance of the imaging module provided by the embodiment of the present application can reach 80%.

In a possible embodiment, the projection lens 12 includes a diaphragm 121 and a lens group, and the lens group includes at least two lenses, and the parameters of the lens group are adjusted so that the parameters of the projection lens 12 satisfy the aforementioned conditions.

As shown in fig. 3, in one possible embodiment, the projection lens 12 is provided with a diaphragm 121, a first lens 122, a second lens 123 and a third lens 124 in this order from the imaging side (projection target side) to the light source side, the first lens 122 is a positive power lens, the first lens 122 is a convex surface on the light source side of the paraxial region, and at least one of the two surfaces of the first lens 122 is an aspheric surface. The second lens 123 is a negative power lens, the second lens 123 is concave on the image side of the paraxial region, and convex on the light source side of the paraxial region, and at least one of the two surfaces of the second lens 123 is aspheric. The third lens element 124 is a positive power lens element, the third lens element 124 is convex on the paraxial imaging side, and at least one of the two surfaces of the third lens element 124 is aspheric.

The first lens 122 is a positive power lens with a focal length f1, the positive power distribution of the first lens 122 can enlarge the angle of the emergent light rays and can increase the field angle FOV, the paraxial radius of curvature of the imaging side surface of the first lens 122 is R1, the paraxial radius of curvature of the light source side surface is R2, and the first lens 122 can satisfy the following conditions: -1< f1/R1< -0.2; -2.5< f1/R2< -1.5; 2< R1/R2< 4.5. The curvature radii of the two surfaces of the first lens 122 can be reasonably distributed by the above conditions, and the correction of aberration in the process of deflecting light rays is facilitated.

The second lens 123 is a negative power lens with a focal length f2, the negative power distribution of the second lens 123 can effectively correct aberrations and improve the projection quality, the paraxial radius of curvature of the imaging side surface of the second lens 123 is R3, the paraxial radius of curvature of the light source side surface is R4, and the second lens 123 can satisfy the following conditions: 2< f2/R3< 4.5; 0.4< f2/R4< 2; 0.25< R3/R4< 0.45. A reasonable distribution of the radii of curvature of the two surfaces of the second lens 123 helps the lens to better correct aberrations while contributing negative power.

The second lens 123 is a lens of positive power, has a focal length f3, and the third lens 124 has a paraxial radius of curvature of the imaging-side surface of R5 and a paraxial radius of curvature of the light source-side surface of R6, and the third lens 124 satisfies the following conditions: 1.4< f3/R5< 1.6; 0.2< f3/R6< 0.1; -0.2< R5/R6< 0.1.

The third lens 124 is a lens closest to the light source 11, and after the light is emitted from the light source 11, the light is deflected by the third lens 124 with positive focal power, so that the effective aperture sizes of the first lens 122 and the second lens 123 can be effectively reduced, and the projection lens 12 can have a larger field angle FOV.

In addition, 2< R1/R2<4.5, 0.2< R3/R4<0.45, and 0.2< R5/R6<0.1, the curvature radii of the three lenses in the lens 110 are designed, so that the FOV and F number of the lens 110 meet the requirements, the sensitivity of the lens 110 can be reduced, and the yield of products can be improved.

The number of lenses of the lens group may be adjustable, and may be two lenses, or may be four or more lenses, and parameters of each lens may be adjusted so that the projection lens 12 satisfies the preset conditions.

When the quantity of lens is too much, lead to the increase of the volume of emission module 1, the whole volume increase of the module of making a video recording. Moreover, the positions of the receiving module 2 and the transmitting module 1 need to be matched with each other, and usually, the receiving module 2 and the transmitting module 1 are approximately at the same height. When the volume and the position of the transmitting module 1 are changed, the position of the receiving module 2 also needs to be adjusted correspondingly, so that the difficulty of the overall design of the camera module is increased, and the cost of the projection lens 12 is relatively high due to the increase of the number of the lenses. When the number of lenses is too small, the ability of the lenses to process optical signals is relatively poor. In general, four lenses may be disposed inside the receiving module 2, and since the transmitting module 1 is disposed with the light source 11, the light source 11 may occupy a certain space, and in order to make the heights of the transmitting module 1 and the receiving module 2 approximately the same, the volume of the projection lens 12 may be reduced by reducing the number of lenses of the projection lens 12, thereby reducing the influence on the volume of the transmitting module 1. Considering factors such as the structure, the processing difficulty, and the cost, the projection lens 12 using three lenses is a preferable scheme.

In one possible embodiment, the focal length of the projection lens 12 is f, the focal length of the first lens 122 is f1, the focal length of the second lens 123 is f2, and the focal length of the third lens 124 is f3, and the following conditions are satisfied for the distribution of the inter-lens powers: 0.8< f1/f <1.3, -1.3< f2/f < -0.5, -0.4 < f3/f <1.1, -1.3< f2/f1< -0.5, 0.3< f3/f1< 1.

Through designing the respective focal length of three lenses, carry out rational distribution to the focal length of first lens 122, second lens 123 and third lens 124 for projection lens 12 can possess great FOV scope and less F number, and better correction aberration simultaneously effectively improves projection lens 12's projection quality.

The curvature radius satisfies the following condition: 2< r1/r2<4.5, 0.25< r3/r4<0.45, -0.2< r5/r6< 0.1.

The design can reduce the sensitivity of the lens group and improve the yield of products.

The optical axis thickness of the first lens element 122 is CT1, the optical axis thickness of the second lens element 123 is CT2, and the optical axis thickness of the third lens element 124 is CT 3. The three lenses satisfy the following conditions: 0.5< CT1/CT2<1.5, 0.2< CT2/CT3< 1.

Through the center thickness to lens, lens design along the thickness of optical axis direction promptly, can make lens possess reasonable thickness, make projection lens 12 comparatively firm, be favorable to promoting projection lens 12's life.

The refractive index of the first lens material is n1, the abbe number is v1, the refractive index of the second lens is n2, the abbe number is v2, the refractive index of the third lens is n3, and the abbe number is v 3. And the following conditions are satisfied: n1>1.60, n2>1.60, n2>1.60, v1>22.0, v2>22.0 and v3> 22.0.

By designing the refractive index and the dispersion coefficient of the material of each lens, the production and preparation cost can be reduced, the dispersion can be reduced, and the proper aberration balance can be provided.

In a possible implementation, the parameters of the projection lens 12 may be adjusted such that the projection lens 12 satisfies: f is 1.35mm, F is 1.78, FOV is 72, TTL is 3.29 mm.

Specifically, in the present embodiment, the other parameters of the projection lens 12 satisfy:

TABLE 1

Table 3 shows aspheric high-order coefficient coefficients a4, a6, A8, a10, a12, a14, a16 of the aspheric lens:

TABLE 2

As shown in fig. 2, in one possible embodiment, the image capturing module includes a first barrel 13 and a second barrel 21, the receiving module 2 further includes an image sensor chip 22, an imaging lens 23 and a filter 24, the first barrel 13 is mounted on a first area of the circuit board 3, and the projection lens 12 is fixed on the first barrel 13 and mounted above the light source 11. The first barrel 13 is used to mount and protect the projection lens 12. The second barrel 21 is mounted in a second region of the circuit board 3, and can accommodate the image sensor chip 22, and the imaging lens 23 is fixed in the second barrel 21 and disposed above the image sensor chip 22 for imaging the depth light signal to the image sensor chip 22, and the optical filter 24 is located between the imaging lens 23 and the image sensor chip 22, that is, along a direction away from the upper surface of the circuit board 3, the image sensor chip 22, the optical filter 24, and the imaging lens 23 are sequentially disposed.

As shown in fig. 2, in one possible embodiment, the image pickup module includes a ceramic substrate 4, the light source 11 is mounted on the upper surface of the circuit board 3 through the ceramic substrate 4, and the projection area of the ceramic substrate 4 on the upper surface of the circuit board 3 is smaller than the area of the upper surface.

Light source 11 is great in calorific capacity of course, and VCSEL is porous structure usually moreover, takes place to warp cracked easily, and ceramic material has the radiating efficiency higher, and the better advantage of thermal stability can promote the radiating efficiency to reduce the VCSEL chip and be heated the condition emergence of warping, promote the job stabilization nature of the module of making a video recording, accord with actual user demand more. The appropriate reduction in the area of the ceramic substrate 4 can save the overall cost of the camera module.

As shown in fig. 4, in one possible embodiment, the first barrel 13 is mounted to the circuit board 3 through the ceramic substrate 4.

Through making first lens cone 13 be connected with ceramic substrate 4, can be convenient for fix a position first lens cone 13 when the installation, but also can save the space that first lens cone 13 took at circuit board 3 to can make the structure of the module of making a video recording compacter, be favorable to the miniaturized design of the module of making a video recording.

In one possible embodiment, as shown in fig. 5, the camera module further includes a driving member 5 mounted on the circuit board 3 for driving the light source 11 to emit light.

In one possible embodiment, as shown in fig. 5, the driver 5 is mounted to the circuit board through the ceramic substrate 4, and the driver 5 and the light source 11 are located on the same side of the ceramic substrate 4.

Can make ceramic substrate 4 be used for dispelling the heat to driving piece 5 through such design, be favorable to improving the stability of driving piece 5 work, set up driving piece 5 and light source 11 simultaneously and can integrate driving piece 5 inside first lens cone 13 with ceramic substrate 4 with one side, can also reduce the space that driving piece 5 took at circuit board 3, be favorable to reducing circuit board 3's size, reduce cost.

In a possible embodiment, the circuit board 3 has a lower surface opposite to the upper surface, and the driving member 5 may be mounted on the lower surface of the circuit board 3.

Through installing driving piece 5 in the one side of circuit board for setting up transmission module 1 and receiving module 2, can improve circuit board 3's utilization ratio, be favorable to reducing circuit board 3's volume to practice thrift the cost.

As shown in fig. 6, in one possible embodiment, the lower surface of the circuit board 3 is provided with a recess 31, and the recess 31 may be a groove, a through hole, or the like. The recess 31 is recessed toward the upper surface of the circuit board 3, and at least a part of the driver 5 is located in the recess 31.

Through setting up driving piece 5 in the one side that circuit board 3 kept away from transmission module 1 and receiving module 2, can improve circuit board 3's utilization ratio, reduce circuit board 3's area to be favorable to reducing circuit board 3's size. The recessed portion 31 can facilitate positioning of the driving member 5, and also facilitates reduction in the size of the camera module in the thickness direction of the circuit board 3.

In one possible embodiment, as shown in fig. 6, the lower surface of the circuit board 3 may be provided with a reinforcing plate 6.

In one possible embodiment, the circuit board 3 may be a flexible circuit board 3 or a rigid-flex board or a printed circuit board 3.

The reinforcing plate 6 may be, but not limited to, a steel sheet for reinforcement, and when the circuit board 3 is a rigid-flex board, it may also include a reinforcing member to improve the flatness of the camera module. The reinforcing plate 6 may be provided with a relief structure at a position corresponding to the recess 31.

Because the camera module that this application embodiment provided can save parts such as DOE, protection circuit, Photosensitive Diode (PD), consequently when the equipment, can simplify the step, improve packaging efficiency and reduce cost.

Based on the time of flight TOF module of making a video recording that each above-mentioned embodiment relates to, the embodiment of this application still provides an electronic equipment, and electronic equipment includes the module of making a video recording and the control unit, and the module of making a video recording is used for measuring the degree of depth information of target object, and the control unit is used for according to degree of depth information to at least one item function operation control of electronic equipment. The time of flight TOF that the module of wherein making a video recording related in above any embodiment can be the module of making a video recording, because the module of making a video recording has above technological effect, consequently, the electronic equipment including the module of making a video recording also has corresponding technological effect, and here is no longer repeated.

The embodiment of the application provides a time of flight TOF module and electronic equipment of making a video recording, make a video recording the module and include circuit board 3 and set up transmission module 1 and receiving module 2 at 3 upper surfaces of circuit board, transmission module 1 is including being used for emitting the light source 11 of N bundle of spot light and being used for the collimation and throw projection lens 12 of N bundle of spot light, receiving module 2 is used for receiving the degree of depth light signal of N returns and converts into the signal of telecommunication. Wherein, the field angle FOV of the projection lens 12 satisfies 65 degrees < FOV < 80 degrees, the F number of the projection lens 12 is less than 1.9, and the focal length 1.2 < F < 1.4. Through the design of the projection lens 12, after passing through the projection lens 12, the N beam spot light emitted by the light source 11 is directly projected onto a target object at a preset field angle and intensity without copying a light signal and setting a light signal copying element, so that the cost is saved, the thickness of the whole camera module is reduced, and the assembly difficulty of the camera module is also reduced. Furthermore, because the N beam spot light directly reaches the target object after passing through the projection lens, the light loss is reduced, and the utilization rate of the light source is greatly improved.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (17)

1. The utility model provides a time of flight TOF module of making a video recording, its speckle light array that is used for throwing N speckles to constitute with target field angle to target object, its characterized in that, the module of making a video recording includes:

the circuit board at least comprises a first area and a second area which are not overlapped on the upper surface of the circuit board;

the transmitting module is arranged in the first area of the circuit board and comprises a light source and a projection lens, the light source is used for transmitting N beam spots, and the field angle FOV of the projection lens meets the following requirements: 65 ° < FOV < 80 °, an F-number of the projection lens less than 1.9, a focal length 1.2 < F < 1.4, the projection lens for collimating and projecting the N beam spot lights to the target object to produce a speckle light array of the N speckles on the target object; and

and the receiving module is arranged in a second area of the circuit board and is used for receiving the depth optical signals returned after the N speckle arrays irradiate the target object and converting the depth optical signals into electric signals.

2. The time-of-flight TOF camera module according to claim 1, wherein the projection lens satisfies: 0.1< | Y/(f × TTL) | <0.4, wherein f is the focal length of the projection lens, Y is the maximum object height of the projection lens, and TTL is the distance between the diaphragm surface and the imaging surface of the projection lens.

3. The time-of-flight TOF camera module according to claim 1, wherein the projection lens satisfies: f/TTL is more than 0.3 and less than 0.5, wherein f is the focal length of the projection lens, and TTL is the distance between the diaphragm surface and the imaging surface of the projection lens.

4. The time-of-flight TOF camera module according to claim 1, wherein the projection lens satisfies: Y/TTL is more than 0.2 and less than 0.4, wherein Y is the maximum object height of the projection lens, and TTL is the distance between the diaphragm surface and the imaging surface of the projection lens.

5. The time-of-flight TOF camera module according to claim 1, wherein the field angle FOV of the projection lens is 71.9 °.

6. The time of flight TOF camera module of claim 1, wherein the F-number of the projection lens is equal to 1.76.

7. The time of flight TOF camera module of any of claims 1 to 6, wherein the projection lens is provided with a stop and a lens group in sequence from the imaging side to the light source side, the lens group comprising at least two lenses.

8. The time of flight TOF camera module of claim 7, wherein said lens group comprises a first lens, a second lens and a third lens arranged in sequence from an imaging side to a light source side;

the first lens is a lens with positive focal power, the imaging side of the first lens at the paraxial region is a concave surface, the light source side of the first lens at the paraxial region is a convex surface, and at least one surface of the two surfaces of the first lens is an aspheric surface;

the second lens is a lens with negative focal power, the second lens is a concave surface on the imaging side of a paraxial region, the second lens is a convex surface on the light source side of the paraxial region, and at least one of the two surfaces of the second lens is an aspheric surface;

the third lens is a lens with positive focal power, the image side of the third lens at the paraxial region is a convex surface, and at least one surface of the two surfaces of the third lens is an aspheric surface.

9. The time-of-flight TOF camera module of claim 1, wherein the camera module comprises a first barrel and a second barrel, the receiving module comprises an image sensor chip, an imaging lens and a filter;

the first lens barrel is arranged in a first area of the circuit board, and the projection lens is fixed on the first lens barrel and arranged above the light source;

the second lens cone is arranged in a second area of the circuit board, the image sensor chip is accommodated in the second lens cone, the imaging lens is fixed in the second lens cone and arranged above the image sensor chip and used for imaging the depth light signal to the image sensor chip, and the optical filter is positioned between the imaging lens and the image sensor chip.

10. The time of flight TOF camera module of claim 9, further comprising a ceramic substrate through which the light source is disposed on a prime circuit board, wherein a projected area of the ceramic substrate on an upper surface of the circuit board is smaller than an area of the upper surface.

11. The time-of-flight TOF camera module of claim 10, wherein the first barrel is mounted to the circuit board through the ceramic substrate.

12. The time of flight TOF camera module of claim 1, further comprising an actuator mounted to the circuit board for actuating the light source to emit light.

13. The time of flight TOF camera module of claim 12, wherein the driver is mounted to the circuit board through a ceramic substrate, and wherein the driver and the light source are located on a same side of the ceramic substrate.

14. The time of flight TOF camera module of claim 12, wherein the circuit board has a lower surface opposite the upper surface, the lower surface being provided with a recess recessed in the direction of the upper surface, at least a portion of the driver being located in the recess.

15. The time-of-flight TOF camera module of claim 1, wherein the circuit board is a flexible circuit board or a rigid-flex board or a printed circuit board.

16. The time of flight TOF camera module of claim 1, wherein a lower surface of the circuit board is provided with a stiffener.

17. An electronic device, comprising:

a time of flight TOF camera module according to any one of claims 1 to 16 for measuring depth information of a target object;

and the control unit is used for carrying out operation control on at least one function of the electronic equipment according to the depth information.

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