CN-121995348-A - Optical ranging module

CN121995348ACN 121995348 ACN121995348 ACN 121995348ACN-121995348-A

Abstract

An optical ranging module is defined with an object side and an element side opposite to the object side and comprises an optical emitting unit, an optical receiving unit, a supporting cover, a conductive film, an anti-reflection film and an anti-reflection film, wherein the supporting cover comprises a top and an annular side wall connected with the top, the top is provided with an object side surface, the annular side wall is provided with an outer surface, the top comprises two openings penetrating from the object side to the element side, the optical emitting unit and the optical receiving unit are respectively arranged at the two openings, the base is arranged at one side of the supporting cover facing the element side, the conductive film is arranged on the object side surface of the top of the supporting cover and the outer surface of the annular side wall, and the anti-reflection film is covered on the conductive film of the top of the supporting cover. The anti-reflection film can be made of low-chroma and low-brightness materials, so that the top reflectivity of the supporting cover is reduced, the measurement accuracy of the optical ranging module can be improved, and the end product (electronic device) presents a more consistent appearance.

Inventors

LIANG YONGFU
CHEN JIONGHONG

Assignees

新钜科技股份有限公司

Dates

Publication Date: 20260508
Application Date: 20241129
Priority Date: 20241108

Claims (10)

1. An optical ranging module defining an object side and an element side opposite to the object side, comprising: An optical emission unit sequentially comprising a first optical lens group and a light source from the object side to the element side; an optical receiving unit, which sequentially comprises a second optical lens group and an optical sensor from the object side to the element side; The supporting cover comprises a top and an annular side wall connected with the top, wherein the top is provided with an object side surface, the annular side wall is provided with an outer surface, the top comprises two openings penetrating from the object side to the element side, and the first optical lens group of the optical transmitting unit and the second optical lens group of the optical receiving unit are respectively arranged at the two openings; the base is arranged on one side of the supporting cover facing the element side, and a first accommodating space and a second accommodating space are defined between the base and the supporting cover, the first accommodating space is used for accommodating the first optical lens group and the light source of the optical transmitting unit, and the second accommodating space is used for accommodating the second optical lens group and the optical sensor of the optical receiving unit; A conductive film disposed on the object side surface and the outer surface of the annular sidewall of the top of the supporting cover, and An anti-reflection film covering the conductive film on the top of the supporting cover.
2. The optical ranging module as claimed in claim 1, further comprising a conductive adhesive disposed at a junction of the conductive film and the base and electrically connected to the conductive film.
3. The optical ranging module as claimed in claim 1, wherein the conductive layer has a thickness between 1000 μm and 20000 μm.
4. The optical ranging module as claimed in claim 1, wherein the conductive layer is made of one of gold, silver, copper, nickel, chromium or stainless steel.
5. The optical ranging module as claimed in claim 1, wherein the anti-reflective film is made of a low-chromaticity material and one selected from titanium oxide and silicon dioxide.
6. The optical ranging module as claimed in claim 1, wherein the anti-reflection film has a thickness ranging from 20 μm to 2000 μm.
7. The optical ranging module as claimed in claim 1, wherein the object side surface of the anti-reflection film has a luminance of less than 5cd/m 2 .
8. The optical ranging module as claimed in claim 1, wherein the conductive film of the annular sidewall has a luminance of between 15cd/m 2 and 30cd/m 2 .
9. The optical ranging module according to claim 1, wherein the anti-reflection film has an optical reflectivity of less than 5% between 380nm and 980 nm.
10. The optical ranging module as claimed in claim 2, wherein the anti-reflective film further extends over the conductive film on the annular sidewall and exposes only a region of the conductive film to contact the conductive paste.

Description

Optical ranging module Technical Field The present invention relates to an optical ranging module, and more particularly to an optical ranging module including an anti-reflection film. Background Time of Flight (ToF) is a method for continuously transmitting light waves to a target object by using a transmitter, receiving the light waves returned from the target object by using a sensor, and obtaining the distance of the target object by detecting the Flight (round trip) Time of the light waves. Currently, a Three-dimensional lens (Three-Dimensional Camera) of an electronic device mainly uses an optical ranging module with a ToF, which includes an optical transmitting unit, an optical receiving unit and a supporting cover. In general, in a consumer electronic product with communication function such as a smart phone, a television, a digital camera with Wifi or bluetooth, an anti-electromagnetic interference shielding is performed on the product to meet various authentication specifications, and in order to reduce the malfunction caused by electromagnetic interference between different chips or electronic components, the product is also shielded against electronic components. For the optical ranging module with ToF, a metal film (for example, EMI coating, electromagnetic Interference Coating) is formed on the outer surface of the supporting cover, so as to reduce electromagnetic interference of the electronic component to the outside. However, the metal film generally has a high light reflectivity, and is prone to generate stray light in the electronic device, which causes measurement interference of the optical ranging module. Disclosure of Invention In order to solve the above-mentioned problems, an object of the present invention is to provide an optical ranging module with an anti-reflection film covering a conductive film on top of a supporting cover, wherein the anti-reflection film is made of a low-chromaticity and low-brightness material, so that the reflectivity of the top of the supporting cover is reduced, and the measurement accuracy of the optical ranging module is improved. According to the above object, the present invention provides an optical ranging module defining an object side and an element side opposite to the object side, and comprising an optical emission unit sequentially comprising a first optical lens set and a light source from the object side to the element side, an optical receiving unit sequentially comprising a second optical lens set and an optical sensor from the object side to the element side, a supporting cover comprising a top and an annular sidewall connected to the top, wherein the top has an object side surface, the annular sidewall has an outer surface, the top comprises two openings penetrating from the object side to the element side, the first optical lens set of the optical emission unit and the second optical lens set of the optical receiving unit are respectively disposed in the two openings, a base disposed on one side of the supporting cover facing the element side, and defining first and second accommodation spaces between the supporting cover, the first accommodation space being for accommodating the first optical lens set of the optical emission unit and the light source, the second accommodation space being used for accommodating the first optical lens set of the optical receiving unit and the second accommodation space being disposed on the outer surface of the top and the top of the supporting film, and the second optical receiving unit being disposed on the outer surface of the top and the top of the supporting film. Optionally, the optical ranging module further includes a conductive adhesive disposed at a connection portion between the conductive film and the base and electrically connected to the conductive film. Optionally, the conductive layer has a thickness of between 1000 μm and 20000 μm. Optionally, the material of the conductive layer is selected from one of gold, silver, copper, nickel, chromium or stainless steel. Optionally, the anti-reflective film is a low-chromaticity material and is selected from one of titanium oxide or silicon dioxide. Optionally, the anti-reflective film has a thickness of between 20 μm and 2000 μm. Optionally, the object side surface of the anti-reflective film has a luminance of less than 5cd/m 2. Optionally, the conductive film of the annular sidewall has a luminance between 15cd/m 2 and 30cd/m 2. Optionally, the anti-reflection film has an optical reflectivity of less than 5% between 380nm and 980 nm. Optionally, the anti-reflection film further extends to cover the conductive film on the annular side wall, and only exposes a region to enable the conductive film to be in contact with the conductive adhesive. According to the optical ranging module, the anti-reflection film can reduce the light reflectivity of the conductive film at the top of the supporting cover, so that the generation of stray light is reduce