US 2026/0063880 A1Published application

Plastic optical folding element, imaging lens module and electronic device

AssigneeLargan Precision Co., Ltd.

InventorsShih-Jung HSU, Chen-Wei FAN

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Abstract

A plastic optical folding element includes an incident surface, at least one reflection surface, an exiting surface and a reflection film. A light enters the plastic optical folding element through the incident surface. The reflection surface is for changing a traveling direction of the light. The light leaves the plastic optical folding element from the exiting surface. A reflection film is disposed on the reflection surface, a bottom of the reflection film is physically contacted with the reflection surface, a top of the reflection film is disposed relative to the bottom. The reflection film includes, in order from the bottom to the top which is away from the reflection surface, a first multilayer film, a first connecting layer, a first Ag layer and a blocking layer.

Claims27

Dependent claims

A plastic optical folding element, comprising:

an incident surface, a light entering the plastic optical folding element through the incident surface;
at least one reflection surface, the at least one reflection surface for changing a traveling direction of the light;
an exiting surface, the light leaving the plastic optical folding element from the exiting surface;
and
a reflection film disposed on the at least one reflection surface, a bottom of the reflection film physically contacted with the at least one reflection surface, a top of the reflection film disposed relative to the bottom, the reflection film comprising, in order from the bottom to the top which is away from the at least one reflection surface:
a first multilayer film comprising at least one first low reflectance layer and at least one first high reflectance layer, wherein a reflectance of the at least one first high reflectance layer is higher than a reflectance of the at least one first low reflectance layer, and the at least one first high reflectance layer and the at least one first low reflectance layer are stacked alternatively;
a first connecting layer comprising Aluminium oxide;
a first Ag layer comprising Argentum;
a blocking layer comprising at least one of Nickel, Titanium, Vanadium, Chromium, Nickel oxide, Titanium oxide, Vanadium oxide and Chromium oxide;
and
a second multilayer film comprising at least one second low reflectance layer and at least one second high reflectance layer, wherein a reflectance of the at least one second high reflectance layer is higher than a reflectance of the at least one second low reflectance layer, and the at least one second high reflectance layer and the at least one second low reflectance layer are stacked alternatively;
wherein a thickness of the first multilayer film is Dmf1, a thickness of the blocking layer is Db, a distance between the first Ag layer and the bottom is Hag1, and the following conditions are satisfied:
70
⁢
nm
<
Dmf
⁢
1
<
420
⁢
nm
;
20
⁢
nm
<
Db
<
180
⁢
nm
;
and
90
⁢
nm
<
Hag
⁢
1
<
550
⁢
nm
.

44 more elements

A plastic optical folding element, comprising:

an incident surface, a light entering the plastic optical folding element through the incident surface;
at least one reflection surface, the at least one reflection surface for changing a traveling direction of the light;
an exiting surface, the light leaving the plastic optical folding element from the exiting surface;
and
a reflection film disposed on the at least one reflection surface, a bottom of the reflection film physically contacted with the at least one reflection surface, a top of the reflection film disposed relative to the bottom, the reflection film comprising, in order from the bottom to the top which is away from the at least one reflection surface:
a first multilayer film comprising at least one first low reflectance layer and at least one first high reflectance layer, wherein a reflectance of the at least one first high reflectance layer is higher than a reflectance of the at least one first low reflectance layer, and the at least one first high reflectance layer and the at least one first low reflectance layer are stacked alternatively;
a first connecting layer comprising Aluminium oxide;
a first Ag layer comprising Argentum;
and
a blocking layer comprising at least one of Nickel, Titanium, Vanadium, Chromium, Nickel oxide, Titanium oxide, Vanadium oxide and Chromium oxide;
wherein a thickness of the first multilayer film is Dmf1, a thickness of the blocking layer is Db, a distance between the first Ag layer and the bottom is Hag1, and the following conditions are satisfied:
0.1
<
Db
/
Dmf
⁢
1
<
0.9
;
70
⁢
nm
<
Dmf
⁢
1
<
420
⁢
nm
;
and
90
⁢
nm
<
Hag
⁢
1
<
550
⁢
nm
.

43 more elements

Dependencies are inferred from the claim text.