Patent Description:
With the development of electronic device technologies, requirements for appearances of electronic devices become increasingly high. Particularly, in the aspect of thicknesses of electronic devices, a thinner electronic device can provide a user with a better a grip feeling and improve use experience of the user. Moreover, it is necessary to meet demand of a user for using an electronic device to take pictures and videos. Therefore, manufacturers further improve an imaging effect by changing a structure of a camera module.

For a camera module with an optical zoom, in order to increase a shooting distance of the camera module and achieve 10x or greater zooming, the camera module needs to have a longer focal length. This usually needs to increase a size of the camera module. Correspondingly, a thickness of the electronic device is increased, resulting in poor user experience.

Therefore, it is necessary to improve a camera module of an electronic device, thereby resolving a problem that a thickness of the electronic device is increased due to an increased size of the camera module.

The document <CIT> discloses an optical lens module which can realize continuous zooming with a short optical thickness and a simple structure.

Embodiments of this application aim to provide a camera module and an electronic device, thereby resolving a problem that a thickness of the electronic device is increased due to an increased size of the camera module.

To resolve the technical problem, this application is implemented as follows.

According to a first aspect, an embodiment of this application provides a camera module. The camera module includes a first lens, a second lens, and a photosensitive chip that are coaxially disposed in a first direction sequentially. The first direction is a thickness direction of the camera module. A clearance is disposed between every two of the first lens, the second lens, and the photosensitive chip. A first reflective film is disposed on a side of the first lens away from the second lens. A second reflective film is disposed on a side of the first lens close to the second lens. The second lens is entirely provided with a third reflective film on a side close to the photosensitive chip. A light-transmitting hole is provided on a middle part of the side of the second lens close to the photosensitive chip. At least two adjusting lenses are disposed in the light-transmitting hole.

According to a second aspect, an embodiment of this application provides an electronic device. The electronic device is provided with the camera module described above.

In the embodiments of this application, due to cooperation among the first reflective film, the second reflective film, and the third reflective film that are disposed on the first lens and the second lens, incident light is received by the photosensitive chip after being refracted and reflected multiple times, the photosensitive chip converts an optical signal into an electrical signal and forms an image. This decreases a total length of a lens path of the camera module without affecting imaging quality, and achieves an effect of decreasing a size of the camera module. In addition, according to this application, a structure is simple, and production is easy.

The accompanying drawings described herein are intended to provide further understanding of this application, and constitute a part of this application. Example embodiments of this application and descriptions thereof are intended to describe this application, but do not constitute inappropriate limitations to this application. In the accompanying drawings:.

Reference numerals in the accompanying drawings are as follows:
<NUM>: lens assembly; <NUM>: first lens; <NUM>: first reflective film; <NUM>: second reflective film; <NUM>: first arc surface; <NUM>: second arc surface; <NUM>: second lens; <NUM>: third reflective film; <NUM>: light-transmitting hole; <NUM>: third arc surface; <NUM>: adjusting lens; <NUM>: third lens; <NUM>: fourth lens; <NUM>: photosensitive chip; <NUM>: stabilization motor; <NUM>: filter; <NUM>: circuit board; and <NUM>: bracket.

The following clearly and completely describes technical solutions in the embodiments of this application with reference to the accompanying drawings in the embodiments of this application. Apparently, the described embodiments are some rather than all of the embodiments of this application.

The terms "first", "second", and the like in the specification and claims of this application are used to distinguish between similar objects instead of describing a specific order or sequence. It should be understood that, data termed in such a way is interchangeable in proper circumstances, so that the embodiments of this application can be implemented in an order other than the order illustrated or described herein. In addition, in the specification and claims, "and/or" represents at least one of connected objects, and a character "/" generally represents an "or" relationship between associated objects.

With reference to the accompanying drawings, an electronic device in an embodiment of this application is described in detail below based on specific embodiments and application scenarios thereof.

As shown in <FIG>, a camera module is provided. The camera module includes a first lens <NUM>, a second lens <NUM>, and a photosensitive chip <NUM> that are coaxially disposed in a first direction sequentially. The first direction is a thickness direction of the camera module. A clearance is disposed between every two of the first lens <NUM>, the second lens <NUM>, and the photosensitive chip <NUM>. A first reflective film <NUM> is disposed on a side of the first lens <NUM> away from the second lens <NUM>. A second reflective film <NUM> is disposed on a side of the first lens <NUM> close to the second lens <NUM>. The second lens <NUM> is entirely provided with a third reflective film <NUM> on a side close to the photosensitive chip <NUM>. A light-transmitting hole <NUM> is provided on a middle part of the side of the second lens <NUM> close to the photosensitive chip <NUM>. At least two adjusting lenses <NUM> are disposed in the light-transmitting hole <NUM>. As shown in <FIG>, the first lens <NUM> is disposed above the second lens <NUM>, and a top surface of the first lens <NUM> is a light input surface. Moreover, the first reflective film <NUM> on the top surface of the first lens <NUM> can prevent light from being incident to the light-transmitting hole <NUM> directly; and the light is incident to the second lens <NUM> from a circumference on the top surface of the first lens <NUM>. Because the third reflective film <NUM> is disposed on a bottom surface of the second lens <NUM>, light cannot be incident to an interior of the camera module and be received by the photosensitive chip <NUM>. The light is reflected to a bottom surface of the first lens <NUM>. The second reflective film <NUM> on the bottom surface of the first lens <NUM> reflects the light into the light-transmitting hole <NUM>. The light passes through the adjusting lenses <NUM> in the light-transmitting hole <NUM>. The adjusting lenses <NUM> can disperse the light in the light-transmitting hole <NUM>, so that the photosensitive chip <NUM> can receive an optical signal by a maximum area. After receiving the optical signal, the photosensitive chip <NUM> converts the optical signal into an electrical signal. After being reflected multiple times, the optical signal received by the photosensitive chip <NUM> has a larger magnification. It is also ensured that the photosensitive chip <NUM> can receive light by a larger area, thereby ensuring an excellent imaging effect. In addition, a thickness of the camera module can be decreased, too. When the camera module is mounted in an electronic device, the following case is avoided: A thickness of an electronic device is affected due to a large thickness of a camera module. This can not only increase a shooting distance of the camera module, but also decrease a thickness of the electronic device.

Specifically, due to cooperation between the first reflective film <NUM> and the third reflective film <NUM>, light can be prevented from being directly incident into the light-transmitting hole <NUM> and received by the photosensitive chip <NUM>. Therefore, a preset zoom factor is achieved. This further improves the imaging effect of the camera module.

Optionally, as shown in <FIG>, a middle part on the side, away from the second lens <NUM>, of the first lens <NUM> is provided with a first arc surface <NUM>; a circumference on the side, away from the second lens <NUM>, of the first lens <NUM> is a plane; the first reflective film <NUM> covers the first arc surface <NUM>; the side, close to the second lens <NUM>, of the first lens <NUM> is provided with a second arc surface <NUM>; a side, away from the photosensitive chip <NUM>, of the second lens <NUM> is a plane; the side, close to the photosensitive chip <NUM>, of the second lens <NUM> is provided with a third arc surface <NUM>; and the first arc surface <NUM>, the second arc surface <NUM>, and the third arc surface <NUM> are all arranged towards the first direction. The first arc surface <NUM> can not only receive more incident light, but also reflect the incident light to ensure that the incident light is emitted in a dispersed manner. This prevents the incident light from being incident and emitted perpendicularly. A circumference on the top surface of the first lens <NUM> is a plane; and a top surface of the second lens <NUM> is also a plane. This can ensure that more incident light is emitted to the third reflective film <NUM>. The bottom surface of the first lens <NUM> is an arc surface; and the bottom surface of the first lens <NUM> is provided with the second arc surface <NUM>. The first lens <NUM> can refract incident light, to ensure that the incident light can be emitted to the third reflective film <NUM> as much as possible. The third reflective film <NUM> can reflect more light to the second reflective film <NUM>. The second reflective film <NUM> is disposed on the second arc surface <NUM>. The arc-shaped second reflective film <NUM> can gather received light and reflect the light into the light-transmitting hole <NUM>. Therefore, a quantity of optical signals that can be received by the photosensitive chip <NUM> is increased, thereby improving imaging quality of the camera module.

Optionally, as shown in <FIG>, the adjusting lenses <NUM> include a third lens <NUM> and a fourth lens <NUM> in the first direction sequentially; a middle part of the third lens <NUM> protrudes in a second direction; a middle part of the fourth lens <NUM> protrudes in the first direction; a central region of the fourth lens <NUM> protrudes in the first direction; and the first direction is opposite to the second direction. After being reflected by the second reflective film <NUM>, light is emitted to the third lens <NUM> in the light-transmitting hole <NUM>. The third lens <NUM> further gathers the light, thereby avoiding loss of the light caused when the light is refracted to a hole wall of the light-transmitting hole <NUM>. All light gathered by the third lens <NUM> is emitted to the fourth lens <NUM>. After passing through the fourth lens <NUM>, the light is refracted and dispersed. There is a specific clearance between the photosensitive chip <NUM> and the fourth lens <NUM>. The fourth lens <NUM> is arranged close to a bottom of the light-transmitting hole <NUM>. After the light is dispersed, the photosensitive chip <NUM> can receive an optical signal by a larger area. Shapes of the third lens <NUM> and the fourth lens <NUM> are not limited to shapes in this embodiment. Two adjusting lenses <NUM> are provided. An optical path may be designed more flexibly. Different shapes may be designed for the third lens <NUM> and the fourth lens <NUM> based on a reflection requirement of the optical path.

Optionally, the adjusting lenses <NUM> include a fifth lens. The fifth lens is arranged close to the photosensitive chip <NUM>. The fifth lens has the same structure as the fourth lens <NUM>. Because the fifth lens has the same structure as the fourth lens <NUM>, light can be further dispersed. This enables the photosensitive chip <NUM> to receive more light, thereby improving imaging quality of the camera module. The fifth lens is not included in the accompanying drawings of this specification. Specifically, the fifth lens should be disposed between the fourth lens <NUM> and the filter.

Optionally, as shown in <FIG>, in the first direction, an area of a projection of the first reflective film <NUM> on the photosensitive chip <NUM> is greater than an aperture of the light-transmitting hole <NUM>. In order to prevent light from being directly emitted to the photosensitive chip <NUM> and received by the photosensitive chip <NUM>, an area of the first reflective film <NUM> needs to be increased, so that incident light that may be directly incident to the photosensitive chip <NUM> is reflected out of the camera module.

Optionally, as shown in <FIG>, the camera module further includes a lens assembly <NUM>, a stabilization motor <NUM>, a filter <NUM>, a circuit board <NUM>, and a bracket <NUM>. The first lens <NUM> and the second lens <NUM> are mounted in the lens assembly <NUM>. The lens assembly <NUM> is secured in the stabilization motor <NUM>. The stabilization motor <NUM> is securely connected to the bracket <NUM>. The photosensitive chip <NUM> is disposed in the bracket <NUM>. The filter <NUM> is disposed between the second lens <NUM> and the photosensitive chip <NUM>. The circuit board <NUM> is electrically connected to the photosensitive chip <NUM>. The lens assembly <NUM> performs functions of transmitting, reflecting, and refracting light. After incident light is emitted to the lens assembly <NUM>, a portion of the incident light incident to the first lens <NUM> is reflected by the first reflective film <NUM>, and thus cannot pass through the first lens <NUM>. Light incident to the circumference on the top surface of the first lens <NUM> passes through the first lens <NUM>, and is emitted from the top surface of the second lens <NUM> to the bottom surface of the second lens <NUM> after being refracted by the first lens <NUM>. After being reflected by the third reflective film <NUM> on the bottom surface of the second lens <NUM>, light is emitted to the second reflective film <NUM> on the bottom surface of the first lens <NUM>. The second reflective film <NUM> is provided with an arc surface facing the first direction, and can not only receive more reflected light, but also gather light and reflect the light into the light-transmitting hole <NUM>. After passing through the third lens <NUM>, light is refracted and is gathered in an axial direction of the lens assembly <NUM>, so that the light is prevented from being emitted to the hole wall of the light-transmitting hole <NUM>. After passing through the third lens <NUM>, the light passes through the fourth lens <NUM> and the fifth lens respectively. The fourth lens <NUM> and the fifth lens disperse the light in directions away from the axial direction of the lens assembly <NUM>, so that the light can be scattered over the photosensitive chip <NUM> as uniform as possible. In addition, the filter disposed between the fifth lens and the photosensitive chip <NUM> is configured to achieve effects of allowing visible light to pass through and intercepting near-infrared light, thereby further improving the imaging effect of the camera module. Because a magnification of the camera module is large, a slight shake during shooting with a large magnification leads to a blurred image. For this reason, the stabilization motor <NUM> is added. After sensing a shake in a shooting process, the stabilization motor <NUM> drives the lens assembly <NUM> to perform adjustment, thereby canceling the shake, and ensuring image stability and clear imaging. The circuit board <NUM> performs a transmission function of providing an electrical signal for the photosensitive chip <NUM>. The bracket <NUM> provides mounting space for each structure of the camera module, and can protect a structure in the camera module from being damaged.

Optionally, as shown in <FIG>, the first lens <NUM> and the second lens <NUM> are glass lenses. The glass lenses have refractive indexes ranging from <NUM> to <NUM>, and have high transmittance. In an incident process of light, a size of the first lens <NUM> that receives the light is large. Correspondingly, a range of incident light is wide. In this case, a glass lens having a high refractive index is required, so that light can be emitted to the second lens <NUM> as much as possible. Refraction occurs when the second lens <NUM> receives light and reflects light. To ensure that sufficient light can be incident to the second reflective film <NUM>, the second lens <NUM> is also required to have high transmittance and a high refractive index.

Optionally, as shown in <FIG>, the third lens <NUM>, the fourth lens <NUM>, and the fifth lens are plastic lenses. The plastic lenses have refractive indexes ranging from <NUM> to <NUM>. The refractive index can meet a requirement for guiding light to the photosensitive chip <NUM>. Moreover, the plastic lenses are convenient to mount and have low costs, thereby lowering difficulty in production and processing.

Optionally, as shown in <FIG>, in the first direction, an area of a projection of the first lens <NUM> on the photosensitive chip <NUM> is less than an area of a projection of the second lens <NUM> on the photosensitive chip <NUM>. A size of the second lens <NUM> needs to be increased, to increase utilization of incident light, ensure that a refraction effect is more diffused after incident light passes through the first lens <NUM>, and ensure that the second reflection surface can receive more light. Because the first lens <NUM> and the second lens <NUM> are disposed coaxially, the projection of the second lens <NUM> on the photosensitive chip <NUM> covers the projection of the first lens <NUM> on the photosensitive chip <NUM>. This ensures that incident light can be emitted to the photosensitive chip <NUM> as much as possible after a plurality of times of reflection and refraction, thereby improving the imaging effect.

An embodiment of this application provides an electronic device. The electronic device is provided with the display module in any one of the above embodiments. The following uses mobile phones as an example. Nowadays, mobile phones in the market become increasingly thinner, to improve grip feelings of users and further improve use experience of the users. However, requirements for picture and video taking effects of mobile phones in the market are also increasingly strict. An imaging effect of a mobile phone affects a sales volume of the mobile phone to some extent. When the camera module in the foregoing embodiment is used in a mobile phone, a clear long-distance picture taking effect can be achieved on the premise that a thickness of the mobile phone is not changed. This not only meets users' requirements for a hand feeling of the mobile phone, but also meets users' requirements for the picture taking effect of the mobile phone.

Specifically, <FIG> is a diagram of an optical path of the camera module in this application. After being incident to the camera module through the top surface of the first lens <NUM>, light is incident to the second lens <NUM>, then reflected to the second reflective film <NUM> through the third reflective film <NUM>, and finally incident to the photosensitive chip <NUM> after passing through the fourth lens <NUM> and the fifth lens in the light-transmitting hole <NUM>. The photosensitive chip <NUM> converts an optical signal into an electrical signal, and transmits the electrical signal to the electronic device through the circuit board <NUM>.

Claim 1:
A camera module, wherein
the camera module comprises a first lens (<NUM>), a second lens (<NUM>), and a photosensitive chip (<NUM>) that are coaxially disposed in a first direction sequentially, the first direction is a thickness direction of the camera module, a clearance is disposed between every two of the first lens (<NUM>), the second lens (<NUM>), and the photosensitive chip (<NUM>), second reflective film (<NUM>) is disposed on a side of the first lens (<NUM>) close to the second lens (<NUM>), the second lens (<NUM>) is entirely provided with a third reflective film (<NUM>) on a side close to the photosensitive chip (<NUM>), a light-transmitting hole (<NUM>) is provided on a middle part of the side of the second lens (<NUM>) close to the photosensitive chip (<NUM>), and at least two adjusting lenses (<NUM>) are disposed in the light-transmitting hole (<NUM>);
characterized in that a first reflective film (<NUM>) is disposed on a side of the first lens (<NUM>) away from the second lens (<NUM>).