Electronic device
AssigneeLargan Precision Co., Ltd.
InventorsHung-Shuo CHEN, Chien-Hsun WU, Tzu-Chieh KUO
Life of this patent
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Abstract
An electronic device includes at least one optical lens assembly. The optical lens assembly includes four lens elements, and the four lens elements are, in order from an outside to an inside, a first lens element, a second lens element, a third lens element and a fourth lens element. The first lens element has an outside surface being convex in a paraxial region thereof. The second lens element has an inside surface being convex in a paraxial region thereof. The fourth lens element has an inside surface being concave in a paraxial region thereof, wherein at least one of an outside surface and the inside surface of the fourth lens element includes at least one critical point in an off-axis region thereof.
Claims32
An electronic device, comprising at least one optical lens assembly, which comprises four lens elements, the four lens elements being in order from an outside to an inside:
- a first lens element having an outside surface being convex in a paraxial region thereof;
- a second lens element having an inside surface being convex in a paraxial region thereof;
- a third lens element;
- and
- a fourth lens element having an inside surface being concave in a paraxial region thereof, wherein at least one of an outside surface and the inside surface of the fourth lens element comprises at least one critical point in an off-axis region thereof;
- wherein, when a measurement is made in accordance with a reference wavelength as a d-line, an Abbe number of the first lens element is Vd1, an Abbe number of the second lens element is Vd2, an Abbe number of the third lens element is Vd3, an Abbe number of the fourth lens element is Vd4, a focal length of the optical lens assembly is fd, a focal length of the third lens element is fd3, a focal length of the fourth lens element is fd4, and the following conditions are satisfied:
- 0.65<Vd1/Vd2<1.54;
- 0.65<Vd1/Vd3<1.54;
- 0.65<Vd1/Vd4<1.54;
- 10.0<Vd1<38.0;
- and
- 0.69<|fd/fd3|+|fd/fd4|.
An electronic device, comprising at least one optical lens assembly, which comprises four lens elements, the four lens elements being in order from an outside to an inside:
- a first lens element;
- a second lens element having an outside surface being concave in a paraxial region thereof and an inside surface being convex in a paraxial region thereof;
- a third lens element having an outside surface being concave in a paraxial region thereof;
- and
- a fourth lens element having an outside surface being convex in a paraxial region thereof and an inside surface being concave in a paraxial region thereof, wherein the outside surface of the fourth lens element comprises at least one critical point in an off-axis region thereof;
- wherein at least one of the third lens element and the fourth lens element has positive refractive power, and the other one has negative refractive power;
- wherein, when a measurement is made in accordance with a reference wavelength as a d-line, an Abbe number of the first lens element is Vd1, an Abbe number of the second lens element is Vd2, an Abbe number of the third lens element is Vd3, an Abbe number of the fourth lens element is Vd4, a focal length of the optical lens assembly is fd, a focal length of the third lens element is fd3, a focal length of the fourth lens element is fd4, and the following conditions are satisfied:
- 0.65<Vd1/Vd2<1.54;
- 0.65<Vd1/Vd3<1.54;
- 0.65<Vd1/Vd4<1.54;
- and
- 0.69<|fd/fd3|+|fd/fd4|<2.65.
An electronic device, comprising a sensing module, which comprises:
- a projection apparatus comprising an optical lens assembly and at least one light source, wherein the optical lens assembly comprises four to six lens elements, and the light source is disposed on an inside conjugation surface of the optical lens assembly;
- and
- a receiving apparatus comprising an optical lens assembly and an image sensor, wherein the optical lens assembly comprises four to six lens elements, and the image sensor is disposed on an inside conjugation surface of the optical lens assembly;
- wherein the light source of the projection apparatus is projected on a sensed object and is received by the receiving apparatus after a reflection, and is imaged on the image sensor;
- wherein, when a measurement is made in accordance with a reference wavelength as a d-line, at least six lens elements of the lens elements of the optical lens assembly of the projection apparatus and the lens elements of the optical lens assembly of the receiving apparatus have Abbe numbers smaller than 38;
- wherein, in the optical lens assembly of each of the projection apparatus and the receiving apparatus, an axial distance between an outside surface of one of the lens elements closest to the outside and an inside surface of one of the lens elements closest to the inside is TD, and the following condition is satisfied:
- 1 mm<TD<5 mm.
Dependencies are inferred from the claim text.