An imaging lens consists of: a first lens group having positive power, the first lens group including a positive lens closest to an object within the first lens group; an aperture stop; and a second lens group having positive power. The first lens group, the aperture stop, and the second lens group are disposed in that order from an object side toward an image side. Only two negative air lenses of a first biconvex air lens and a second biconvex air lens are provided within the imaging lens. The first lens group includes the first biconvex air lens, and the second lens group includes a second biconvex air lens.

An imaging lens system includes a first lens group, a first reflective portion including a plurality of reflective surfaces, and a second reflective portion including a plurality of reflective surfaces. The first lens group, the first reflective portion, and the second reflective portion are sequentially arranged from an object side, and 2.0 < TTL/f1 < 4.0 is satisfied, where TTL is a distance from an object-side surface of a first lens of the first lens group to an imaging plane, and f1 is a focal length of the first lens.

An imaging lens system includes a first lens group, a first reflective portion including a plurality of reflective surfaces, and a second reflective portion including a plurality of reflective surfaces. The first lens group, the first reflective portion, and the second reflective portion are sequentially arranged from an object side, and 2.0 < TTL/f1 < 4.0 is satisfied, where TTL is a distance from an object-side surface of a first lens of the first lens group to an imaging plane, and f1 is a focal length of the first lens.

An optical module includes a first bearer and a second bearer. The first bearer includes a first bearing portion and an inclined plane, the first bearing portion is configured to carry a first optical element, and the inclined plane is disposed on a peripheral edge of a first end surface of the first bearing portion. The second bearer includes a second bearing portion and a protruding portion, the second bearing portion is configured to carry a second optical element, a second end surface of the second bearing portion faces the first end surface, and the protruding portion extends from the second end surface to the first bearing portion and is configured to contact the inclined plane. When the protruding portion contacts the inclined plane, the inclined plane does not expose the protruding portion in a direction from the first bearing portion to the second bearing portion.

A system includes an aperture diaphragm, a first lens configured to be disposed next to the aperture diaphragm on an object side, and to include one or more positive lenses and one or more negative lenses, and a second lens configured to be disposed next to the aperture diaphragm on an image side, and to include one or more positive lenses and one or more negative lenses. Predetermined conditions are satisfied.

A system includes an aperture diaphragm, a first lens configured to be disposed next to the aperture diaphragm on an object side, and to include one or more positive lenses and one or more negative lenses, and a second lens configured to be disposed next to the aperture diaphragm on an image side, and to include one or more positive lenses and one or more negative lenses. Predetermined conditions are satisfied.

An optical imaging lens, in order from an object side to an image side along an optical axis, includes a first lens assembly, an aperture, and a second lens assembly. The first lens assembly includes a first optical assembly. The second lens assembly includes, in order along the optical axis Z from the object side to the image side, a second optical assembly, a third optical assembly, a fourth optical assembly, and a fifth optical assembly, wherein three of the first optical assembly, the second optical assembly, the third optical assembly, the fourth optical assembly, and the fifth optical assembly are a compound lens formed by adhering at least two lenses, while the others are single lens, thereby achieving the effect of high image quality and low distortion and satisfying the imaging requirement of visible light during the day and infrared light at night.

An optical imaging lens, in order from an object side to an image side along an optical axis, includes a first lens assembly, an aperture, and a second lens assembly. The first lens assembly includes a first optical assembly. The second lens assembly includes, in order along the optical axis Z from the object side to the image side, a second optical assembly, a third optical assembly, a fourth optical assembly, and a fifth optical assembly, wherein three of the first optical assembly, the second optical assembly, the third optical assembly, the fourth optical assembly, and the fifth optical assembly are a compound lens formed by adhering at least two lenses, while the others are single lens, thereby achieving the effect of high image quality and low distortion and satisfying the imaging requirement of visible light during the day and infrared light at night.

A system consists of a front lens unit and a negative lens on an image side of the front lens unit. A focal length of the system, a focal length of the negative lens, an effective diameter of a lens surface on an object side of the negative lens, a diameter of an aperture stop that determines an on-axis ray, and an on-axis distance from an endmost point in a light effective area of the lens surface on the object side of the negative lens to an on-axis point of the negative lens satisfy predetermined inequalities.

A system consists of a front lens unit and a negative lens on an image side of the front lens unit. A focal length of the system, a focal length of the negative lens, an effective diameter of a lens surface on an object side of the negative lens, a diameter of an aperture stop that determines an on-axis ray, and an on-axis distance from an endmost point in a light effective area of the lens surface on the object side of the negative lens to an on-axis point of the negative lens satisfy predetermined inequalities.